CN106101934A - Speaker and the method for adjustment of speaker amplitude - Google Patents

Abstract

The present disclosure relates to a loudspeaker and a method for adjusting the amplitude of the loudspeaker. The loudspeaker includes a diaphragm, an intelligent power amplifier, a capacitor, a power supply, and a current detection module, wherein: the capacitor, the power supply, and the current detection module are connected in series to form a loop, the current detection module is connected to the input terminal of the intelligent power amplifier, and the output terminal of the intelligent power amplifier Connected to the diaphragm; the first plate of the capacitor is arranged on the surface of the diaphragm, and the second plate of the capacitor is separated from the first plate by a certain distance, and is arranged directly above or directly below the first plate; the current detection module, It is used to detect the current in the loop and feed back the measured current to the intelligent power amplifier; the intelligent power amplifier receives the current measured by the current detection module, determines the amplitude of the diaphragm according to the current, and adjusts the intelligent power according to the amplitude of the diaphragm amplifier output signal. This technical solution can measure the real amplitude of the diaphragm in real time, and feed it back to the upper layer for real-time processing of the output signal.

Description

How to adjust the loudspeaker and the amplitude of the loudspeaker

technical field

The present disclosure relates to the technical field of loudspeakers, in particular to a loudspeaker and a method for adjusting the amplitude of the loudspeaker.

Background technique

With the rise of smart phones, thinner, smarter, and more power-saving mobile phones restrict the continuous development of mobile phone speakers to thinner and lighter, and with it, it brings a huge challenge to the improvement of the sound quality of mobile phones. It is undoubtedly a luxury to have a music feast on a smartphone. SmartPA (Smart Power Amplifier, Smart Power Amplifier) has begun to be widely used in mobile phones to adapt to the impact of thinner and thinner mobile phone designs on speaker loudness and sound quality. SmartPA is based on the traditional PA, adding a current and voltage sensing IV sensor at the output end for feedback, and the IV sensor is connected to the two signal lines of the speaker.

The amplitude of the diaphragm of the speaker is related to two factors, one is the frequency of the audio data played, and the other is the voltage value output by the power amplifier. Due to the characteristics of the speaker itself, the amplitude of the diaphragm is different for signals of different frequency bands. When the frequency of the audio data is fixed, adjusting the output voltage value of the power amplifier can change the amplitude of the diaphragm.

Based on this principle, the model of the amplitude corresponding to the frequency and voltage is established in advance. In the process of playing audio data, compare the frequency of the played audio data and the IV of the feedback with the pre-established model to determine the amplitude of the speaker's diaphragm, and use the corresponding algorithm to adjust the output voltage of the power amplifier. The purpose of SmartPA is to increase the output voltage of the power amplifier on the basis of not damaging the speaker. SmartPA can use the corresponding model to make real-time adjustments according to different frequency bands, so as to avoid damage to the speaker due to excessive signal amplitude or burn out.

During the adjustment process, since the model of the amplitude of the diaphragm is established in advance, and it is established in the state when the loudspeaker is just produced, the basic model cannot be modified after the establishment. However, as the mobile phone is used for a period of time, the diaphragm and other materials will age, and the physical properties will continue to change. The basic model at the beginning will be different from the current situation. The amplitude will be calculated according to the current and voltage on the speaker output signal line, and the error will become larger. bigger and bigger.

Contents of the invention

Embodiments of the present disclosure provide a method, a device and a loudspeaker for adjusting the amplitude of a loudspeaker. Described technical scheme is as follows:

According to the first aspect of an embodiment of the present disclosure, a speaker is provided, including a diaphragm, an intelligent power amplifier, a capacitor, a power supply, and a current detection module, wherein:

The capacitor, the power supply, and the current detection module are connected in series to form a loop, the current detection module is connected to the input end of the intelligent power amplifier, and the output end of the intelligent power amplifier is connected to the diaphragm;

The first pole plate of the capacitor is arranged on the surface of the diaphragm, and the second pole plate of the capacitor is separated from the first pole plate by a certain distance, and is arranged directly above or directly below the first pole plate;

A current detection module, configured to detect the current in the loop, and feed back the measured current to the intelligent power amplifier;

The intelligent power amplifier receives the current measured by the current detection module, determines the amplitude of the diaphragm according to the current, and adjusts the output signal of the intelligent power amplifier according to the amplitude of the diaphragm.

In one embodiment,

The current detection module may include a Hall sensor;

or

The current detection module may include a resistor and a voltage detection unit, wherein the resistor is connected in series in the loop; the voltage detection unit is respectively connected in series at both ends of the resistor for detecting the voltage at both ends of the resistor .

In one embodiment, the speaker may further include a first coil and a second coil;

The output end of the intelligent power amplifier is connected to one end of the diaphragm through the first coil;

The output end of the intelligent power amplifier is connected to the other end of the diaphragm through the second coil.

In one embodiment, the speaker may further include: a calibration detection module;

The calibration detection module is connected to the intelligent power amplifier, and is used to detect the output frequency, voltage/current of the intelligent power amplifier;

The intelligent power amplifier is also used to determine the reference amplitude corresponding to the output frequency and voltage/current in the pre-established model, and when it is determined that the reference amplitude is inconsistent with the determined amplitude, the reference amplitude in the model is Adjust to the determined amplitude.

According to the second aspect of an embodiment of the present disclosure, there is provided a method for adjusting the amplitude of a loudspeaker, including: detecting the current in a loop formed by connecting a capacitor, a power supply, and a current detection module in series, wherein the first plate of the capacitor is set at On the surface of the diaphragm, the second plate of the capacitor is separated from the first plate by a certain distance, and is arranged directly above/directly below the first plate;

determining the vibration amplitude of the diaphragm according to the current;

The output signal of the intelligent power amplifier is adjusted according to the amplitude of the diaphragm.

In one embodiment, the method may also include:

According to the output frequency and voltage/current of the intelligent power amplifier, determine the reference amplitude corresponding to the output frequency and voltage/current in the pre-established model;

When it is determined that the reference amplitude is inconsistent with the determined amplitude, the reference amplitude in the model is adjusted to the determined amplitude.

In one embodiment, the determining the vibration amplitude of the diaphragm according to the current may include:

Determine the charge of the plate according to the following formula:

Q=It

Wherein, Q is the electric charge of polar plate, I is electric current, and t is electrification time;

The vibration amplitude of the diaphragm is determined according to the change of the charged amount of the capacitor plate.

In one embodiment, the determining the vibration amplitude of the diaphragm according to the change of the charged amount of the capacitor plate may include:

Calculate and determine the amplitude of the diaphragm according to the following formula:

$\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, A is the amplitude of the diaphragm, S is the facing area of the first plate and the second plate of the capacitor, U is the voltage across the capacitor, and Q1 is the capacitor plate when the _first plate is in the first vibration position , Q ₂ is the charged amount of the capacitor plate when the first plate is in the second vibration position, ε, π and k are constants respectively.

In one embodiment, the detection of the current in the loop formed by the series connection of the capacitor, the power supply and the current detection module may include:

Use a Hall sensor to detect the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series; or

The voltage across a resistor connected in series in the loop is sensed and the current is determined according to the following formula:

I=U/R

Among them, I is the current, R is the resistance, and U is the voltage across R.

In one embodiment, the adjusting the output signal of the intelligent power amplifier according to the amplitude of the diaphragm may include:

When it is determined that the amplitude exceeds a safe range, the output signal of the intelligent power amplifier is reduced so that the amplitude does not exceed a safe range.

According to a third aspect of the embodiments of the present disclosure, there is provided a loudspeaker amplitude adjustment device, including:

The detection module is used to detect the current in the loop formed by the capacitor, the power supply, and the current detection module connected in series, wherein the first plate of the capacitor is arranged on the surface of the diaphragm, and the second plate of the capacitor is connected to the first The polar plates are separated by a certain distance and arranged directly above/directly below the first polar plate;

a first determination module, configured to determine the vibration amplitude of the diaphragm according to the current;

The first adjustment module is configured to adjust the output signal of the intelligent power amplifier according to the amplitude of the diaphragm.

In one embodiment, the device may also include:

The second determination module is used to determine the reference amplitude corresponding to the output frequency and voltage/current in the pre-established model according to the output frequency and voltage/current of the intelligent power amplifier;

A second adjustment module, configured to adjust the reference amplitude in the model to the determined amplitude when it is determined that the reference amplitude is inconsistent with the determined amplitude.

In one embodiment, the first determination module may include:

The first determination sub-module is used to determine the charged amount of the pole plate according to the following formula:

Q=It

Wherein, Q is the electric charge of polar plate, I is electric current, and t is electrification time;

The second determination sub-module is used to determine the vibration amplitude of the diaphragm according to the change of the charged amount of the capacitor plate.

In one embodiment, the second determining submodule can also be used for:

Calculate and determine the amplitude of the diaphragm according to the following formula:

$\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, A is the amplitude of the diaphragm, S is the facing area of the first plate and the second plate of the capacitor, U is the voltage across the capacitor, and Q1 is the capacitor plate when the _first plate is in the first vibration position , Q ₂ is the charged amount of the capacitor plate when the first plate is in the second vibration position, ε, π and k are constants respectively.

In one embodiment, the detection module may include:

The detection sub-module is used to detect the current in the loop formed by the series connection of the capacitor, the power supply and the current detection module by using the Hall sensor; or

The third determination sub-module is used to detect the voltage across the resistor connected in series in the loop, and determine the current according to the following formula:

I=U/R

Among them, I is the current, R is the resistance, and U is the voltage across R.

In one embodiment, the first adjustment module may include:

The adjustment sub-module is used to reduce the output signal of the intelligent power amplifier when it is determined that the amplitude exceeds a safe range, so that the amplitude does not exceed a safe range.

According to a fourth aspect of an embodiment of the present disclosure, there is provided a loudspeaker amplitude adjustment device, including:

processor;

memory for storing processor-executable instructions;

Wherein, the processor is configured as:

Detecting the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series, wherein the first pole plate of the capacitor is arranged on the surface of the diaphragm, and the second pole plate of the capacitor is separated from the first pole plate by a certain distance , set directly above/below the first polar plate;

determining the vibration amplitude of the diaphragm according to the current;

The output signal of the intelligent power amplifier is adjusted according to the amplitude of the diaphragm.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

The above technical solution of the embodiment of the present disclosure measures the real amplitude of the diaphragm in real time, and at the same time the speaker has a maximum amplitude as a standard. If the maximum amplitude is exceeded, the output gain of the intelligent power amplifier needs to be reduced to reduce the output signal, so that The amplitude of the diaphragm is reduced to avoid damage to the speaker. Therefore, even if the material of the diaphragm ages, it can provide accurate feedback and reduce errors.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a circuit diagram of a speaker according to an exemplary embodiment.

Fig. 2 is a circuit diagram of another speaker according to an exemplary embodiment.

Fig. 3 is a circuit diagram of another speaker according to an exemplary embodiment.

Fig. 4 is a flowchart showing a method for adjusting the amplitude of a loudspeaker according to an exemplary embodiment.

Fig. 5 is a flow chart showing another method for adjusting the amplitude of a loudspeaker according to an exemplary embodiment.

Fig. 6 is a flow chart showing another method for adjusting the amplitude of a loudspeaker according to an exemplary embodiment.

Fig. 7 is a block diagram of a device for adjusting loudspeaker amplitude according to an exemplary embodiment.

Fig. 8 is a block diagram of another apparatus for adjusting the amplitude of a loudspeaker according to an exemplary embodiment.

Fig. 9 is a block diagram of the first determination module 72 in the device for adjusting the loudspeaker amplitude according to an exemplary embodiment.

Fig. 10 is a block diagram of a detection module 71 in a loudspeaker amplitude adjustment device according to an exemplary embodiment.

Fig. 11 is another block diagram of the detection module 71 in the device for adjusting the loudspeaker amplitude according to an exemplary embodiment.

Fig. 12 is a block diagram of the first adjustment module 73 in the loudspeaker amplitude adjustment device shown according to an exemplary embodiment.

Fig. 13 is a block diagram of a device suitable for adjusting the amplitude of a loudspeaker according to an exemplary embodiment.

detailed description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

The sounding principle of the loudspeaker can be briefly summarized as follows: The magnetic field of the loudspeaker is generated by a magnet. The coil is placed in the magnetic field. When the signal command with alternating current as the carrier passes through the coil, the magnetic induction line will be cut, causing the coil to vibrate under the influence of electromagnetic induction. The vibration of the coil drives the diaphragm to vibrate. The diaphragm repeatedly stretches and compresses the surrounding air, which creates sound waves. Obviously the loudspeaker is a component capable of electrotransforming sound.

An embodiment of the present disclosure provides a loudspeaker, as shown in FIG. 1 , including a diaphragm 11, which shows two different vibration positions of the diaphragm 11 (indicated by solid lines and dashed lines, respectively), an intelligent power amplifier 12, and a capacitor 13. , power supply 14, current detection module 15, wherein:

The capacitor 13, the power supply 14, and the current detection module 15 are connected in series to form a loop, the current detection module 15 is connected to the input end of the intelligent power amplifier 12, and the output end of the intelligent power amplifier 12 is connected to the diaphragm 11; the first plate 131 of the capacitor 13 Set on the surface of the diaphragm 11, the second pole plate 132 of the capacitor 13 is separated from the first pole plate 131 by a certain distance, and is arranged directly above or directly below the first pole plate 131 (as shown in FIG. directly above the pole plate 131); the current detection module 15 is used to detect the current in the loop, and the measured current is fed back to the smart power amplifier 12; the smart power amplifier 12 receives the current measured by the current detection module 15, and The amplitude of the diaphragm 11 is determined according to the current, and the output signal of the intelligent power amplifier 12 is adjusted according to the amplitude of the diaphragm 11 .

The first plate 131 of the capacitor 13 can be made by compounding conductive material on the surface of the diaphragm 11, the second plate 132 of the capacitor 13 is fixed directly above the first plate 131, and the second plate 132 can be fixed in any way , such as installing the second pole plate 132 on a fixing frame/fixing plate, etc. The first pole plate 131 and the second pole plate 132 form two poles of the capacitor 13 .

The formula for calculating capacitance is:

$\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}\mathrm{<span\; class="notranslate">\; k</span>}\mathrm{<span\; class="notranslate">\; d</span>}}$

Among them, S is the facing area of the two plates of the capacitor, d is the distance between the two plates, and the rest are constants.

Since the diaphragm vibrates up and down, S will not change, but d will change, thus causing C to change. At the same time according to the following formula:

$\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; Q</span>}}{\mathrm{<span\; class="notranslate">\; u</span>}}$

Among them, Q is the charged amount of the plate, U is the voltage at both ends of the plate, U will not change in the circuit, and C will change, causing Q to change. The change of Q is manifested in the directional migration of electrons between the two plates, so Changes in d can be deduced by detecting changes in Q. Q can be obtained by the following formula:

Q=It

Among them, Q is the charged amount of the plate, I is the current, and t is the electrification time.

Once Q is determined, the vibration amplitude d of the diaphragm can be calculated.

In one embodiment, the current detection module 15 may include a Hall sensor.

Alternatively, the current detection module 15 may include a resistor and a voltage detection unit, wherein the resistor is connected in series in the loop; the voltage detection unit is respectively connected in series at both ends of the resistor for detecting the voltage at both ends of the resistor.

The current detection module 15 can also be integrated with the intelligent power amplifier 12 to form a chip.

In one embodiment, as shown in Figure 2, the loudspeaker can also include a first coil 16 and a second coil 17; the output end of the intelligent power amplifier 12 is connected to one end of the diaphragm 11 by the first coil 16; The output end is connected to the other end of the diaphragm 11 through the second coil 17 .

In one embodiment, as shown in Figure 3, the loudspeaker can also include: a calibration detection module 18; the calibration detection module 18 is connected with the intelligent power amplifier 12, and is used to detect the output frequency, voltage/current of the intelligent power amplifier 12; The amplifier 12 is also used to determine the corresponding reference amplitude of the output frequency and voltage/current in the pre-established model, and adjust the reference amplitude in the model to the determined amplitude when it is determined that the reference amplitude is inconsistent with the determined amplitude.

The working process of the loudspeaker is as follows: the AC voltage output by the intelligent power amplifier 12 flows through the first coil 16 and the second coil 17, because the first coil 16 and the second coil 17 are in the magnetic field environment of the magnet, and the magnetic field has an effect on the current therein. The effect of the magnetic field force will therefore push the force in a certain direction to the first coil 16 and the second coil 17, and the direction of the push is obtained according to Ampere's law. Due to the movement of the first coil 16 and the second coil 17, the first coil 16 and the second coil 17 are driven to The vibration of the diaphragm 11 on the coil 16 and the second coil 17 pushes the air to vibrate, which is transmitted into the human ear, causing the vibration of the tympanic membrane in the human ear to hear the sound. The intelligent power amplifier 12 is the driving unit of the loudspeaker, and the loudspeaker needs an input of an electric signal to have sound. After the current detected by the current detection module 15 is fed back to the smart power amplifier 12, the DSP inside the smart power amplifier 12 performs digital signal analysis, and then adjusts the output electrical signal of the smart power amplifier 12, so that the diaphragm works in a safe state. status. The loudspeaker provided by the embodiment of the present disclosure measures the real amplitude of the diaphragm 11 in real time, and the loudspeaker has a maximum amplitude as a standard. If the maximum amplitude is exceeded, the output gain of the intelligent power amplifier 12 needs to be reduced to reduce the output signal, thereby The vibration amplitude of the diaphragm 11 is reduced to prevent the speaker from being damaged. Therefore, even if the material of the vibrating membrane 11 is aged, feedback can be made accurately and errors can be reduced.

Fig. 4 is a flow chart of a method for adjusting speaker amplitude according to an exemplary embodiment. As shown in Fig. 4, the method for adjusting speaker amplitude includes the following steps S401-S403,

In step S401, detect the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series, wherein the first plate of the capacitor is arranged on the surface of the diaphragm, and the second plate of the capacitor is separated from the first plate by a certain distance Distance, set directly above/below the first plate.

In step S402, the vibration amplitude of the diaphragm is determined according to the current.

In step S403, the output signal of the intelligent power amplifier is adjusted according to the amplitude of the diaphragm.

In the above method of the embodiment of the present disclosure, the real amplitude of the diaphragm is measured in real time, and the output signal of the intelligent power amplifier is adjusted in real time according to the measured amplitude. Therefore, even if the diaphragm material ages, it can provide accurate feedback and reduce errors.

In one embodiment, as shown in FIG. 5, the above method may further include the following steps S404-S405:

In step S404, according to the output frequency and voltage/current of the intelligent power amplifier, the reference amplitude corresponding to the output frequency and voltage/current in the pre-established model is determined.

In step S405, when it is determined that the reference amplitude is inconsistent with the determined amplitude, the reference amplitude in the model is adjusted to the determined amplitude.

Since the model of the diaphragm amplitude is pre-established and established when the speaker is just produced, as the mobile phone is used for a period of time, the diaphragm material will age and the physical properties will continue to change. The initial basic model Therefore, the pre-established model can be calibrated by the actual measured amplitude. When the reference amplitude is inconsistent with the determined amplitude, the reference amplitude in the model can be adjusted to the determined amplitude.

In one embodiment, step S402 may be implemented as the following steps A1-A2:

Step A1, determine the charged amount of the polar plate according to the following formula:

Q=It

Among them, Q is the charged amount of the plate, I is the current, and t is the electrification time.

Step A2, determining the vibration amplitude of the diaphragm according to the change of the charged amount of the capacitor plate.

In one embodiment, step A2 can be implemented as step A21 again:

Step A21, calculate and determine the amplitude of the diaphragm according to the following formula:

$\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, A is the amplitude of the diaphragm, S is the facing area of the first plate and the second plate of the capacitor, U is the voltage across the capacitor, and Q1 is the capacitor plate when the _first plate is in the first vibration position , Q ₂ is the charged amount of the capacitor plate when the first plate is in the second vibration position, ε, π and k are constants respectively.

In one embodiment, step S401 may be implemented as step B or C as follows:

Step B, using the Hall sensor to detect the current in the loop formed by the capacitor, the power supply, and the current detection module connected in series.

Alternatively, step C, sense the voltage across a resistor connected in series in the loop, and determine the current according to the following formula:

I=U/R

Among them, I is the current, R is the resistance, and U is the voltage across R.

In one embodiment, as shown in FIG. 6, step S403 may be implemented as step S4031:

In step S4031, when it is determined that the amplitude exceeds the safe range, the output signal of the intelligent power amplifier is reduced so that the amplitude does not exceed the safe range.

The maximum amplitude value that can be tolerated can be set in advance. If the maximum amplitude is exceeded, the output gain of the intelligent power amplifier needs to be reduced to reduce the output signal, thereby reducing the amplitude of the diaphragm and preventing the speaker from being damaged. When the amplitude does not exceed the safe range, the output signal of the power amplifier is not adjusted.

Fig. 7 is a block diagram of an apparatus for adjusting the amplitude of a loudspeaker according to an exemplary embodiment. The apparatus may be implemented as part or all of an electronic device through software, hardware or a combination of the two. As shown in Figure 7, the adjusting device of the loudspeaker amplitude includes:

The detection module 71 is configured to detect the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series, wherein the first pole plate of the capacitor is arranged on the surface of the diaphragm, and the second pole plate of the capacitor is connected to the first pole plate separated by a certain distance, and arranged directly above/directly below the first pole plate;

The first determination module 72 is configured to determine the vibration amplitude of the diaphragm according to the current;

The first adjustment module 73 is configured to adjust the output signal of the intelligent power amplifier according to the amplitude of the diaphragm.

In one embodiment, as shown in Figure 8, the above-mentioned device may further include:

The second determination module 74 is configured to determine the reference amplitude corresponding to the output frequency and voltage/current in the pre-established model according to the output frequency and voltage/current of the intelligent power amplifier;

The second adjustment module 75 is configured to adjust the reference amplitude in the model to the determined amplitude when it is determined that the reference amplitude is inconsistent with the determined amplitude.

In one embodiment, as shown in FIG. 9, the first determination module 72 may include:

The first determination sub-module 721 is configured to determine the charged amount of the pole plate according to the following formula:

Q=It

Wherein, Q is the electric charge of polar plate, I is electric current, and t is electrification time;

The second determination sub-module 722 is configured to determine the vibration amplitude of the diaphragm according to the change of the charged amount of the capacitor plate.

In one embodiment, the second determining submodule 722 can also be configured to:

Calculate and determine the amplitude of the diaphragm according to the following formula:

$\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, A is the amplitude of the diaphragm, S is the facing area of the first plate and the second plate of the capacitor, U is the voltage across the capacitor, and Q1 is the capacitor plate when the _first plate is in the first vibration position , Q ₂ is the charged amount of the capacitor plate when the first plate is in the second vibration position, ε, π and k are constants respectively.

In one embodiment, as shown in FIG. 10, the detection module 71 may include:

The detection sub-module 711 is configured to use a Hall sensor to detect the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series; or

As shown in FIG. 11 , it includes: a third determining submodule 712 configured to detect the voltage across the resistor connected in series in the loop, and determine the current according to the following formula:

I=U/R

Among them, I is the current, R is the resistance, and U is the voltage across R.

In one embodiment, as shown in FIG. 12, the first adjustment module 73 may include:

The adjustment sub-module 731 is configured to reduce the output signal of the intelligent power amplifier when it is determined that the amplitude exceeds the safe range, so that the amplitude does not exceed the safe range.

The above-mentioned device in the embodiment of the present disclosure measures the real amplitude of the diaphragm in real time, and adjusts the output signal of the intelligent power amplifier in real time according to the measured amplitude. Therefore, even if the diaphragm material ages, it can provide accurate feedback and reduce errors.

An embodiment of the present disclosure also provides a loudspeaker amplitude adjustment device, including:

processor;

memory for storing processor-executable instructions;

Wherein, the processor is configured as:

Detecting the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series, wherein the first pole plate of the capacitor is arranged on the surface of the diaphragm, and the second pole plate of the capacitor is separated from the first pole plate by a certain distance , set directly above/below the first polar plate;

determining the vibration amplitude of the diaphragm according to the current;

The output signal of the intelligent power amplifier is adjusted according to the amplitude of the diaphragm.

The above processor is also configured to:

According to the output frequency and voltage/current of the intelligent power amplifier, determine the reference amplitude corresponding to the output frequency and voltage/current in the pre-established model;

When it is determined that the reference amplitude is inconsistent with the determined amplitude, the reference amplitude in the model is adjusted to the determined amplitude.

The above processor is also configured to:

Determine the charge of the plate according to the following formula:

Q=It

Wherein, Q is the electric charge of polar plate, I is electric current, and t is electrification time;

The vibration amplitude of the diaphragm is determined according to the change of the charged amount of the capacitor plate.

The above processor is also configured to:

Calculate and determine the amplitude of the diaphragm according to the following formula:

$\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, A is the amplitude of the diaphragm, S is the facing area of the first plate and the second plate of the capacitor, U is the voltage across the capacitor, and Q1 is the capacitor plate when the _first plate is in the first vibration position , Q ₂ is the charged amount of the capacitor plate when the first plate is in the second vibration position, ε, π and k are constants respectively.

The above processor is also configured to:

Use a Hall sensor to detect the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series; or

The voltage across a resistor connected in series in the loop is sensed and the current is determined according to the following formula:

I=U/R

Among them, I is the current, R is the resistance, and U is the voltage across R.

The above processor is also configured to:

When it is determined that the amplitude exceeds a safe range, the output signal of the intelligent power amplifier is reduced so that the amplitude does not exceed a safe range.

Fig. 13 is a block diagram showing a device for adjusting the amplitude of a loudspeaker according to an exemplary embodiment, and the device is suitable for a terminal device. For example, the apparatus 1200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

Apparatus 1200 may include one or more of the following components: processing component 1202, memory 1204, power supply component 1206, multimedia component 1208, audio component 1210, input/output (I/O) interface 1212, sensor component 1214, and communication component 1216 .

The processing component 1202 generally controls the overall operations of the device 1200, such as those associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 1202 may include one or more processors 1220 to execute instructions to complete all or part of the steps of the above method. Additionally, processing component 1202 may include one or more modules that facilitate interaction between processing component 1202 and other components. For example, processing component 1202 may include a multimedia module to facilitate interaction between multimedia component 1208 and processing component 1202 .

The memory 1204 is configured to store various types of data to support operations at the device 1200 . Examples of such data include instructions for any application or method operating on device 1200, contact data, phonebook data, messages, pictures, videos, and the like. The memory 1204 can be implemented by any type of volatile or non-volatile storage device or their combination, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

The power supply component 1206 provides power to various components of the device 1200 . Power components 1206 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for device 1200 .

The multimedia component 1208 includes a screen that provides an output interface between the device 1200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may not only sense a boundary of a touch or swipe action, but also detect duration and pressure associated with the touch or swipe action. In some embodiments, the multimedia component 1208 includes a front camera and/or a rear camera. When the device 1200 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capability.

The audio component 1210 is configured to output and/or input audio signals. For example, the audio component 1210 includes a microphone (MIC), which is configured to receive external audio signals when the device 1200 is in operation modes, such as call mode, recording mode and voice recognition mode. Received audio signals may be further stored in memory 1204 or sent via communication component 1216 . In some embodiments, the audio component 1210 also includes a speaker for outputting audio signals.

The I/O interface 1212 provides an interface between the processing component 1202 and a peripheral interface module, which may be a keyboard, a click wheel, a button, and the like. These buttons may include, but are not limited to: a home button, volume buttons, start button, and lock button.

Sensor assembly 1214 includes one or more sensors for providing status assessments of various aspects of device 1200 . For example, the sensor component 1214 can detect the open/closed state of the device 1200, the relative positioning of components, such as the display and keypad of the device 1200, and the sensor component 1214 can also detect a change in the position of the device 1200 or a component of the device 1200 , the presence or absence of user contact with the device 1200 , the device 1200 orientation or acceleration/deceleration and the temperature change of the device 1200 . Sensor assembly 1214 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. Sensor assembly 1214 may also include optical sensors, such as CMOS or CCD image sensors, for use in imaging applications. In some embodiments, the sensor component 1214 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor.

The communication component 1216 is configured to facilitate wired or wireless communication between the apparatus 1200 and other devices. The device 1200 can access wireless networks based on communication standards, such as WiFi, 2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 1216 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1216 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wide Band (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, apparatus 1200 may be programmed by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable A gate array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation for performing the methods described above.

In an exemplary embodiment, there is also provided a non-transitory computer-readable storage medium including instructions, such as the memory 1204 including instructions, which can be executed by the processor 820 of the device 1200 to implement the above method. For example, the non-transitory computer readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of the device 1200, the device 1200 can execute the above method for adjusting the speaker amplitude, the method comprising:

Detecting the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series, wherein the first pole plate of the capacitor is arranged on the surface of the diaphragm, and the second pole plate of the capacitor is separated from the first pole plate by a certain distance , set directly above/below the first polar plate;

determining the vibration amplitude of the diaphragm according to the current;

The output signal of the intelligent power amplifier is adjusted according to the amplitude of the diaphragm.

In one embodiment, the method may also include:

According to the output frequency and voltage/current of the intelligent power amplifier, determine the reference amplitude corresponding to the output frequency and voltage/current in the pre-established model;

When it is determined that the reference amplitude is inconsistent with the determined amplitude, the reference amplitude in the model is adjusted to the determined amplitude.

In one embodiment, the determining the vibration amplitude of the diaphragm according to the current may include:

Determine the charge of the plate according to the following formula:

Q=It

Wherein, Q is the electric charge of polar plate, I is electric current, and t is electrification time;

The vibration amplitude of the diaphragm is determined according to the change of the charged amount of the capacitor plate.

In one embodiment, the determining the vibration amplitude of the diaphragm according to the change of the charged amount of the capacitor plate may include:

Calculate and determine the amplitude of the diaphragm according to the following formula:

$\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}\mathrm{<span\; class="notranslate">\; S</span>}\mathrm{<span\; class="notranslate">\; u</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&pi;kQ</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, A is the amplitude of the diaphragm, S is the facing area of the first plate and the second plate of the capacitor, U is the voltage across the capacitor, and Q1 is the capacitor plate when the _first plate is in the first vibration position , Q ₂ is the charged amount of the capacitor plate when the first plate is in the second vibration position, ε, π and k are constants respectively.

In one embodiment, the detection of the current in the loop formed by the series connection of the capacitor, the power supply and the current detection module may include:

Use a Hall sensor to detect the current in the loop formed by connecting the capacitor, the power supply, and the current detection module in series; or

The voltage across a resistor connected in series in the loop is sensed and the current is determined according to the following formula:

I=U/R

Among them, I is the current, R is the resistance, and U is the voltage across R.

In one embodiment, the adjusting the output signal of the intelligent power amplifier according to the amplitude of the diaphragm may include:

When it is determined that the amplitude exceeds a safe range, the output signal of the intelligent power amplifier is reduced so that the amplitude does not exceed a safe range.

The following are device embodiments of the present disclosure, which can be used to implement the method embodiments of the present disclosure.

Other embodiments of the disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It should be understood that the present disclosure is not limited to the precise constructions which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (17)

1. a speaker, it is characterised in that include vibrating diaphragm, intelligent power amplifier, capacitor, power supply, current detection module, Wherein:

Described capacitor, power supply, current detection module are connected in series to form loop, described current detection module and described intelligence merit The input of rate amplifier connects, and the outfan of described intelligent power amplifier is connected with vibrating diaphragm；

First pole plate of described capacitor is arranged on the surface of described vibrating diaphragm, the second pole plate of described capacitor and the first pole plate phase Every a segment distance, it is arranged on surface or the underface of the first pole plate；

Current detection module, for detecting the electric current in described loop, and by the current feedback that records to intelligent power amplifier；

Intelligent power amplifier, the electric current that reception current detection module records, and the amplitude of vibrating diaphragm, root is determined according to described electric current Amplitude according to vibrating diaphragm adjusts the output signal of intelligent power amplifier.

Speaker the most according to claim 1, it is characterised in that

Described current detection module includes Hall element；

Or

Described current detection module includes resistance, voltage detection unit, wherein, described resistance, is connected in described loop；Described Voltage detection unit is connected on the two ends of described resistance respectively, for detecting the voltage at described resistance two ends.

Speaker the most according to claim 1, it is characterised in that described speaker also includes first coil and the second line Circle；

The outfan of described intelligent power amplifier connects one end of vibrating diaphragm by first coil；

The outfan of described intelligent power amplifier connects the other end of vibrating diaphragm by the second coil.

4. according to the speaker according to any one of claim 1-3, it is characterised in that described speaker also includes: calibration inspection Survey module；

Described calibration detection module is connected with described intelligent power amplifier, for detecting the output frequency of intelligent power amplifier Rate, voltage/current；

Described intelligent power amplifier is additionally operable to determine that described output frequency, voltage/current are corresponding in the model pre-build Reference amplitude, determine when described reference amplitude and the described amplitude determined are inconsistent, the reference amplitude in described model adjusted Whole for the described amplitude determined.

5. the method for adjustment of a speaker amplitude, it is characterised in that including:

Electric current in the loop that sensing capacitor, power supply, current detection module are connected in series to form, wherein, described capacitor First pole plate is arranged on the surface of vibrating diaphragm, and the second pole plate of described capacitor and the first pole plate at a distance, are arranged on Surface/the underface of one pole plate；

The amplitude of described vibrating diaphragm is determined according to described electric current；

Amplitude according to described vibrating diaphragm adjusts the output signal of intelligent power amplifier.

Method the most according to claim 5, it is characterised in that described method also includes:

Output frequency according to described intelligent power amplifier, voltage/current, determine that described output frequency, voltage/current are in advance Reference amplitude corresponding in the model first set up；

Determine when described reference amplitude and the described amplitude determined are inconsistent, it is described that the reference amplitude in described model is adjusted to The amplitude determined.

Method the most according to claim 5, it is characterised in that the described amplitude determining described vibrating diaphragm according to described electric current, Including:

The carried charge of pole plate be determined according to the following equation:

Q=It

Wherein, Q is the carried charge of pole plate, and I is electric current, and t is conduction time；

The change of the carried charge according to described capacitor plate determines the amplitude of described vibrating diaphragm.

Method the most according to claim 7, it is characterised in that the change of the described carried charge according to described capacitor plate Determine the amplitude of described vibrating diaphragm, including:

Calculate according to following equation and determine the amplitude of vibrating diaphragm:

$A=\frac{\mathrm{\&epsiv;}SU}{4{\mathrm{\&pi;kQ}}_1}-\frac{\mathrm{\&epsiv;}SU}{4{\mathrm{\&pi;kQ}}_2}$

Wherein, A is the amplitude of vibrating diaphragm, and S is that the right opposite of the first pole plate of capacitor and the second pole plate amasss, and U is capacitor two ends Voltage, Q₁It is the first pole plate carried charge of capacitor plate, Q when being in the first vibration position₂It is that the first pole plate is in the second vibration The carried charge of capacitor plate during position, ε, π and k are respectively constant.

Method the most according to claim 5, it is characterised in that described sensing capacitor, power supply, current detection module are connected Connect the electric current in the loop formed, including:

Electric current in the loop that use Hall element sensing capacitor, power supply, current detection module are connected in series to form；Or

The voltage at resistance two ends that detection is connected in described loop, is determined according to the following equation electric current:

I=U/R

Wherein, I is electric current, and R is resistance, and U is the voltage at R two ends.

Method the most according to claim 5, it is characterised in that the described amplitude according to described vibrating diaphragm adjusts intelligent power The output signal of amplifier, including:

When determining described amplitude beyond safety range, reduce the output signal of described intelligent power amplifier, make described amplitude not Beyond safety range.

The adjusting apparatus of 11. 1 kinds of speaker amplitudes, it is characterised in that including:

Detection module, the electric current in the loop that sensing capacitor, power supply, current detection module are connected in series to form, wherein, First pole plate of described capacitor is arranged on the surface of vibrating diaphragm, the second pole plate of described capacitor and the first pole plate be separated by one section away from From, it is arranged on the surface/underface of the first pole plate；

First determines module, for determining the amplitude of described vibrating diaphragm according to described electric current；

First adjusting module, adjusts the output signal of intelligent power amplifier for the amplitude according to described vibrating diaphragm.

12. devices according to claim 11, it is characterised in that described device also includes:

Second determines module, for the output frequency according to described intelligent power amplifier, voltage/current, determines described output The reference amplitude that frequency, voltage/current are corresponding in the model pre-build；

Second adjusting module, during for determining that described reference amplitude and the described amplitude determined are inconsistent, by described model Reference amplitude is adjusted to the described amplitude determined.

13. devices according to claim 11, it is characterised in that described first determines module, including:

First determines submodule, for the carried charge of pole plate is determined according to the following equation:

Q=It

Wherein, Q is the carried charge of pole plate, and I is electric current, and t is conduction time；

Second determines submodule, and the change for the carried charge according to described capacitor plate determines the amplitude of described vibrating diaphragm.

14. devices according to claim 13, it is characterised in that described second determines that submodule is additionally operable to:

Calculate according to following equation and determine the amplitude of vibrating diaphragm:

$A=\frac{\mathrm{\&epsiv;}SU}{4{\mathrm{\&pi;kQ}}_1}-\frac{\mathrm{\&epsiv;}SU}{4{\mathrm{\&pi;kQ}}_2}$

Wherein, A is the amplitude of vibrating diaphragm, and S is that the right opposite of the first pole plate of capacitor and the second pole plate amasss, and U is capacitor two ends Voltage, Q₁It is the first pole plate carried charge of capacitor plate, Q when being in the first vibration position₂It is that the first pole plate is in the second vibration The carried charge of capacitor plate during position, ε, π and k are respectively constant.

15. devices according to claim 11, it is characterised in that described detection module, including:

Detection sub-module, for using what Hall element sensing capacitor, power supply, current detection module be connected in series to form to return Electric current in road；Or

3rd determines submodule, for the voltage at the resistance two ends that detection is connected in described loop, is determined according to the following equation Electric current:

I=U/R

Wherein, I is electric current, and R is resistance, and U is the voltage at R two ends.

16. devices according to claim 11, it is characterised in that described first adjusting module, including:

Adjust submodule, when being used for determining described amplitude beyond safety range, reduce the output letter of described intelligent power amplifier Number, make described amplitude without departing from safety range.

The adjusting apparatus of 17. 1 kinds of speaker amplitudes, it is characterised in that including:

Processor；

For storing the memorizer of processor executable；

Wherein, described processor is configured to:

Electric current in the loop that sensing capacitor, power supply, current detection module are connected in series to form, wherein, described capacitor First pole plate is arranged on the surface of vibrating diaphragm, and the second pole plate of described capacitor and the first pole plate at a distance, are arranged on Surface/the underface of one pole plate；

The amplitude of described vibrating diaphragm is determined according to described electric current；

Amplitude according to described vibrating diaphragm adjusts the output signal of intelligent power amplifier.