CN216313181U - Audio recording circuit and wireless fixed telephone - Google Patents
Audio recording circuit and wireless fixed telephone Download PDFInfo
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- CN216313181U CN216313181U CN202122640812.0U CN202122640812U CN216313181U CN 216313181 U CN216313181 U CN 216313181U CN 202122640812 U CN202122640812 U CN 202122640812U CN 216313181 U CN216313181 U CN 216313181U
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Abstract
The application provides an audio recording circuit and a wireless fixed telephone. The audio recording circuit comprises an audio circuit, an audio amplifier differential circuit and a recording regulation circuit; the audio circuit comprises a first audio differential circuit and a second audio differential circuit, and the output end of the first audio differential circuit is connected with the output end of the second audio differential circuit; the output end of the sound amplifier differential circuit is connected with the output end of the first audio frequency differential circuit; the output end of the recording regulation and control circuit is connected with the output end of the first audio frequency differential circuit, and the output end of the recording regulation and control circuit is used for being connected with the audio frequency memory so as to adjust the voice differential signal transmitted to the audio frequency memory. Under the action of each differential circuit, the hands-free voice, the handle voice and the loud-speaking voice are subjected to common-mode processing, so that interference signals are reduced, accurate voice signals are transmitted to an audio memory to be stored when hands are free and the handle is used, and the anti-interference performance of the audio recording circuit is improved.
Description
Technical Field
The utility model relates to the technical field of fixed telephones, in particular to an audio recording circuit and a wireless fixed telephone.
Background
With the development of the telephone room service industry, higher requirements are placed on the service attitude of customer service personnel, and the customer service personnel communicate with customers in a telephone or network voice mode, and specifically comprise a wireless fixed telephone, a computer client APP and a server platform. The service attitude of the customer is managed and controlled by the customer service staff and the network sales staff, the telephone of the customer and the network sales staff records, after the recording, the wireless fixed telephone is transmitted to the computer client through the sound card channel, and the computer client uploads the record to the cloud server, so that the customer service staff and the network sales staff can know the working states of the customer service staff and the network sales staff at any time as long as the customer service staff and the network sales staff enter the platform management system to call the recording file, and the service awareness is greatly improved.
However, the audio recording circuit in the conventional wireless fixed telephone is complex, the 4G circuit and the radio frequency circuit thereof have strong interference to the audio recording circuit, and the situation that the recorded information is unclear frequently occurs, and recording is seriously lacked, so that the recorded information cannot be used.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides an audio recording circuit and a wireless fixed telephone which can reduce the interference to audio recording signals.
The purpose of the utility model is realized by the following technical scheme:
an audio recording circuit comprising: the audio circuit, the sound amplifier differential circuit and the recording regulation circuit; the audio circuit comprises a first audio differential circuit and a second audio differential circuit, wherein the input end of the first audio differential circuit is used for being connected with the output end of a first radio circuit, the output end of the first audio differential circuit is connected with the output end of the second audio differential circuit, the input end of the second audio differential circuit is used for being connected with the output end of a second radio circuit, the output end of the first audio differential circuit is used for outputting a hands-free voice differential signal, and the output end of the second audio differential circuit is used for outputting a handle voice differential signal; the input end of the sound amplification differential circuit is used for being connected with the output end of the sound amplification circuit, the output end of the sound amplification differential circuit is connected with the output end of the first audio differential circuit, and the output end of the sound amplification differential circuit is used for outputting a loud-speaking voice differential signal; the input end of the recording regulation and control circuit is used for being connected with the control end of the recording regulator, the output end of the recording regulation and control circuit is connected with the output end of the first audio frequency differential circuit, and the output end of the recording regulation and control circuit is used for being connected with an audio frequency storage device so as to adjust the voice differential signal transmitted to the audio frequency storage device.
In one embodiment, the first audio differential circuit includes a first audio amplifier, a first in-phase resistor, a first in-phase capacitor, a first in-phase feedback resistor, a first inverse capacitor, and a first inverse feedback resistor, a first output terminal of the first radio receiver circuit is connected to a first terminal of the first in-phase capacitor, a second terminal of the first in-phase capacitor is connected to the in-phase terminal of the first audio amplifier through the first in-phase resistor, and the in-phase terminal of the first audio amplifier is further grounded through the first in-phase inverse feedback resistor; the second output end of the first radio circuit is connected with the first end of the first inverting capacitor, the second end of the first inverting capacitor is connected with the inverting end of the first audio amplifier through the first inverting resistor, and the inverting end of the first audio amplifier is further connected with the output end of the first audio amplifier through the first inverting feedback resistor.
In one embodiment, the first audio differential circuit further includes a first inverting filter capacitor, the inverting terminal of the first audio amplifier is connected to the first terminal of the first inverting filter capacitor, and the second terminal of the first inverting filter capacitor is grounded.
In one embodiment, the first audio differential circuit further includes a first in-phase filter capacitor, the in-phase terminal of the first audio amplifier is connected to the first terminal of the first in-phase filter capacitor, and the second terminal of the first in-phase filter capacitor is grounded.
In one embodiment, the first audio differential circuit further includes a first pull-up resistor, a first terminal of the first pull-up resistor is used for connecting with an external reference power supply, and a second terminal of the first pull-up resistor is connected with the non-inverting terminal of the first audio amplifier.
In one embodiment, the first audio differential circuit further includes a first output filter capacitor, the output terminal of the first audio amplifier is connected to a first terminal of the first output filter capacitor, and a second terminal of the first output filter capacitor is grounded.
In one embodiment, the first audio differential circuit further includes a first low-pass capacitor and a first low-pass resistor, the output terminal of the first audio amplifier is connected to a first terminal of the first low-pass resistor through the first low-pass capacitor, and a second terminal of the first low-pass resistor is connected to the audio receiving terminal of the audio memory.
In one embodiment, a resistance ratio of the first in-phase resistor to the first in-phase feedback resistor is equal to a resistance ratio of the first anti-phase resistor to the first anti-phase feedback resistor.
In one embodiment, the audio recording circuit further includes a common output capacitor, the output terminal of the audio amplifier differential circuit is connected to a first terminal of the common output capacitor, and a second terminal of the common output capacitor is grounded.
A wireless fixed telephone comprises the audio recording circuit in any embodiment.
Compared with the prior art, the utility model has at least the following advantages:
under the action of each differential circuit, the hands-free voice, the handle voice and the loud-speaking voice are subjected to common-mode processing, so that interference signals in the hands-free voice, the handle voice and the loud-speaking voice are reduced, and when the hands are free and the handle is used, accurate voice signals are transmitted to an audio memory to be stored, so that the anti-interference performance of audio recording signals of the audio recording circuit is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a circuit diagram of an audio recording circuit according to an embodiment;
FIG. 2 is a diagram of an audio memory connected to the audio recording circuit shown in FIG. 1.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model relates to an audio recording circuit. In one embodiment, the audio recording circuit comprises an audio circuit, an audio amplifier differential circuit and a recording regulation circuit. The audio circuit includes a first audio differential circuit and a second audio differential circuit. The input end of the first audio frequency differential circuit is used for being connected with the output end of the first radio receiving circuit, and the output end of the first audio frequency differential circuit is connected with the output end of the second audio frequency differential circuit. And the input end of the second audio frequency differential circuit is used for being connected with the output end of the second radio receiving circuit. Wherein, the output end of the first audio frequency differential circuit is used for outputting the hands-free voice differential signal. And the output end of the second audio frequency differential circuit is used for outputting a handle voice differential signal. The input end of the sound amplifier differential circuit is used for being connected with the output end of the sound amplifier circuit, the output end of the sound amplifier differential circuit is connected with the output end of the first audio differential circuit, and the output end of the sound amplifier differential circuit is used for outputting a loud-speaking voice differential signal. The input end of the recording regulation and control circuit is used for being connected with the control end of the recording regulator, the output end of the recording regulation and control circuit is connected with the output end of the first audio frequency differential circuit, and the output end of the recording regulation and control circuit is used for being connected with an audio frequency storage device so as to adjust the voice differential signal transmitted to the audio frequency storage device. Under the action of each differential circuit, the hands-free voice, the handle voice and the loud-speaking voice are subjected to common-mode processing, so that interference signals in the hands-free voice, the handle voice and the loud-speaking voice are reduced, and when the hands are free and the handle is used, accurate voice signals are transmitted to an audio memory to be stored, so that the anti-interference performance of audio recording signals of the audio recording circuit is improved.
Please refer to fig. 1, which is a circuit diagram of an audio recording circuit according to an embodiment of the present invention.
The audio recording circuit 10 of an embodiment includes an audio circuit 100, an audio amplifier circuit 200, and a recording control circuit 300. The audio circuit 100 includes a first audio differential circuit 110 and a second audio differential circuit 120. The input end of the first audio differential circuit 110 is used for being connected with the output end of the first radio receiving circuit, and the output end of the first audio differential circuit 110 is connected with the output end of the second audio differential circuit 120. The input end of the second audio frequency difference circuit 120 is used for being connected with the output end of the second radio receiving circuit. Wherein, the output end of the first audio differential circuit 110 is used for outputting the hands-free voice differential signal. The output end of the second audio frequency difference circuit 120 is used for outputting the handle voice difference signal. The input end of the sound amplifying differential circuit 200 is used for being connected with the output end of a sound amplifying circuit, the output end of the sound amplifying differential circuit 200 is connected with the output end of the first audio differential circuit 110, wherein the output end of the sound amplifying differential circuit 200 is used for outputting a loud-speaking sound differential signal. The input end of the recording control circuit 300 is configured to be connected to the control end of the recording controller, the output end of the recording control circuit 300 is connected to the output end of the first audio differential circuit 110, and the output end of the recording control circuit 300 is configured to be connected to an audio memory, for example, the output end of the recording control circuit 300 is connected to an audio receiving end RECORD _ MICIN of the audio memory, so as to adjust the voice differential signal transmitted to the audio memory.
In this embodiment, under the action of each differential circuit, the hands-free voice, the handle voice and the loud-speaking voice are subjected to common-mode processing, so that interference signals in the hands-free voice, the handle voice and the loud-speaking voice are reduced, and when the hands are not used and the handle is used, accurate voice signals are transmitted to the audio memory to be stored, so that the anti-interference performance of the audio recording signals of the audio recording circuit is improved.
In another embodiment, referring to fig. 1 and fig. 2 together, the output terminal of the first audio differential circuit 110, the output terminal of the second audio differential circuit 120, the output terminal of the first audio differential circuit 110, and the output terminal of the recording control circuit 300 are all connected to an audio receiving terminal RECORD _ MICIN of an audio memory U6, that is, an audio memory U6 is a port for receiving audio signals, so as to facilitate recording in the audio memory U6, so as to facilitate receiving and recording accurate hands-free voice, handyphone voice, and loudspeaking voice, that is, so as to facilitate recording voice of the wireless fixed-line phone when the wireless fixed-line phone is used for hands-free and hand-held microphones, wherein the model of the audio memory U6 is CM119B _ LQFP 48. Moreover, because the voltage of other communication modules is high, for example, the circuit of the 4G module adopts a single fire cattle to supply power, in order to ensure the stable operation of the audio memory U6, the power supply terminal DVDD/AVDD2 of the audio memory U6 is connected with the USB port of the computer to provide 5V power supply voltage for the audio memory U6, so that the high voltage of the wireless fixed phone is avoided, and the damage to the wireless fixed phone is reduced.
In one embodiment, referring to fig. 1, the first audio differential circuit 110 includes a first audio amplifier U7-D, a first in-phase resistor R102, a first in-phase capacitor C212, a first in-phase feedback resistor R103, a first inverting resistor R101, a first inverting capacitor C211, and a first inverting feedback resistor R100, wherein a first output terminal of the first radio receiver circuit is connected to a first terminal of the first in-phase capacitor C212, a second terminal of the first in-phase capacitor C212 is connected to a non-phase terminal of the first audio amplifier U7-D through the first in-phase resistor R102, and the non-phase terminal of the first audio amplifier U7-D is further grounded through the first in-phase feedback resistor R103; the second output end of the first radio receiver circuit is connected to the first end of the first inverting capacitor C211, the second end of the first inverting capacitor C211 is connected to the inverting end of the first audio amplifier U7-D through the first inverting resistor R101, and the inverting end of the first audio amplifier U7-D is further connected to the output end of the first audio amplifier U7-D through the first inverting feedback resistor R100. In this embodiment, the first in-phase resistor R102 and the first in-phase capacitor C212 form an RC filter circuit at the in-phase terminal of the first audio amplifier U7-D for filtering the audio signal inputted to the in-phase terminal of the first audio amplifier U7-D, and the first inverting resistor R101 and the first inverting capacitor C211 form another RC filter circuit at the inverting terminal of the first audio amplifier U7-D for filtering the audio signal inputted to the inverting terminal of the first audio amplifier U7-D. Under the feedback circuit formed by the first in-phase and reverse feeding resistor R103 and the first reverse feedback resistor R100, after the hands-free voice passes through the first audio amplifier U7-D, the hands-free voice signal input from the outside is subjected to differential amplification processing, so that the interference between the input hands-free voice signals is effectively reduced, and the hands-free voice signal is amplified, so that the hands-free voice differential signal received by the audio memory U6 is accurate, namely the definition of the hands-free voice differential signal is improved. The input hands-free voice signals are audio signals on the anode and the cathode of the hands-free microphone, and the type of the first audio amplifier U7-D is the same.
In another embodiment, the second audio differential circuit 120, the audio amplifier differential circuit 200, and the recording control circuit 300 have the same circuit as the first audio differential circuit 110, so that the second audio differential circuit 120, the audio amplifier differential circuit 200, and the recording control circuit 300 all have a differential amplification function, which facilitates accurate recording of different voices. The signals input by the two input ends of the second audio differential circuit 120 are audio signals on the positive and negative electrodes of the microphone of the fixed-line telephone, the signals input by the two input ends of the sound amplifier differential circuit 200 are audio signals on the positive and negative electrodes of the loudspeaker, the signal received by one input end of the recording control circuit 300 is a control signal output by the recording control single chip, and the other input of the recording control circuit 300 is grounded, so that the adjustment of each voice recording time is convenient to determine.
Further, referring to fig. 1, the first audio differential circuit 110 further includes a first inverse filter capacitor C210, an inverse terminal of the first audio amplifier U7-D is connected to a first terminal of the first inverse filter capacitor C210, and a second terminal of the first inverse filter capacitor C210 is grounded. In this embodiment, the first inverting filter capacitor C210 is located at the inverting terminal of the first audio amplifier U7-D, the first terminal of the first inverting filter capacitor C210 is connected to the inverting terminal of the first audio amplifier U7-D, and the first inverting filter capacitor C210 filters the audio signal at the inverting terminal of the first audio amplifier U7-D, so as to ensure that the hands-free voice signal received by the inverting terminal of the first audio amplifier U7-D is accurate, and improve the definition of the hands-free voice differential signal output by the first audio amplifier U7-D. In another embodiment, the second audio frequency differential circuit 120, the audio amplifier differential circuit 200, and the recording control circuit 300 also have an inverting filter capacitor added to the inverting terminal of the amplifier, and the function of the inverting filter capacitor is the same as that of the first inverting filter capacitor C210, which is not described herein again.
Still further, referring to fig. 1, the first audio differential circuit 110 further includes a first in-phase filter capacitor C213, a in-phase terminal of the first audio amplifier U7-D is connected to a first terminal of the first in-phase filter capacitor C213, and a second terminal of the first in-phase filter capacitor C213 is grounded. In this embodiment, the first in-phase filter capacitor C213 is located at the in-phase end of the first audio amplifier U7-D, the first end of the first in-phase filter capacitor C213 is connected to the in-phase end of the first audio amplifier U7-D, and the first in-phase filter capacitor C213 filters the audio signal at the in-phase end of the first audio amplifier U7-D, so as to ensure that the hands-free voice signal received by the in-phase end of the first audio amplifier U7-D is accurate, and further improve the definition of the hands-free voice differential signal output by the first audio amplifier U7-D. In another embodiment, the second audio frequency differential circuit 120, the audio amplifier differential circuit 200, and the recording control circuit 300 also have an in-phase filter capacitor added to the inverting terminal of the amplifier, and the function of the in-phase filter capacitor is the same as that of the first in-phase filter capacitor C213, which is not described herein again.
Still further, referring to fig. 1, the first audio differential circuit 110 further includes a first pull-up resistor R104, a first end of the first pull-up resistor R104 is configured to be connected to an external reference power VDD _ PA, and a second end of the first pull-up resistor R104 is connected to a non-inverting end of the first audio amplifier U7-D. In this embodiment, the first pull-up resistor R104 is connected in series between an external reference power source VDD _ PA and the non-inverting terminal of the first audio amplifier U7-D, the non-inverting terminal of the first audio amplifier U7-D is further connected to the first non-inverting resistor R102 and the first non-inverting feed resistor R103, respectively, in the feedback loop formed by the first non-inverting resistor R102 and the first non-inverting feed resistor R103, the first pull-up resistor R104 provides a higher potential to the non-inverting terminal of the first audio amplifier U7-D, so as to increase the current at the non-inverting terminal of the first audio amplifier U7-D, thereby facilitating the input of a stable audio signal to the non-inverting terminal of the first audio amplifier U7-D, and the amplification of an audio signal received by the non-inverting terminal of the first audio amplifier U7-D, i.e. to facilitate the acquisition of an accurate audio signal at the non-inverting terminal of the first audio amplifier U7-D. In another embodiment, the second audio differential circuit 120, the audio amplifier differential circuit 200, and the recording regulation and control circuit 300 also have a pull-up resistor added to the same terminal of the amplifier, which has the same function as the first pull-up resistor R104, and therefore are not described herein again.
Still further, referring to fig. 1, the first audio differential circuit 110 further includes a first output filter capacitor C214, an output terminal of the first audio amplifier U7-D is connected to a first terminal of the first output filter capacitor C214, and a second terminal of the first output filter capacitor C214 is grounded. In this embodiment, the first output filter capacitor C214 is located at the output end of the first audio amplifier U7-D, and the first output filter capacitor C214 primarily filters the signal output by the first audio amplifier U7-D, mainly filters high-frequency interference signals therein, for example, filters high-frequency signals of an external 4G circuit or a radio frequency circuit, so that the hands-free voice differential signal output by the first audio amplifier U7-D is accurate and stable. In another embodiment, the second audio frequency differential circuit 120, the audio amplifier differential circuit 200, and the recording control circuit 300 also have an output filter capacitor added to the output end of the amplifier, and the function of the output filter capacitor is the same as that of the first output filter capacitor C214, which is not described herein again.
Still further, referring to fig. 1, the first audio differential circuit 110 further includes a first low-pass capacitor C215 and a first low-pass resistor R107, an output terminal of the first audio amplifier U7-D is connected to a first terminal of the first low-pass resistor R107 through the first low-pass capacitor C215, and a second terminal of the first low-pass resistor R107 is connected to an audio receiving terminal RECORD _ MICIN of the audio memory U6. In this embodiment, the first low-pass capacitor C215 and the first low-pass resistor R107 are connected in series to form an RC filter circuit at the output end, so as to filter the output hands-free voice differential signal of the first audio amplifier U7-D, and thereby facilitate outputting the voice information at the specified frequency, i.e. the voice signal output by the first audio amplifier U7-D is an accurate hands-free voice differential signal. In another embodiment, the second audio frequency differential circuit 120, the audio amplifier differential circuit 200, and the recording control circuit 300 also add a low-pass capacitor and a low-pass resistor at the output end of the amplifier, and the functions of the low-pass capacitor and the low-pass resistor are the same as those of the first low-pass capacitor C215 and the first low-pass resistor R107, which are not described herein again.
Still further, referring to fig. 1, a resistance ratio between the first in-phase resistor R102 and the first in-phase feedback resistor R103 is equal to a resistance ratio between the first inverse resistor R101 and the first inverse feedback resistor R100. In this embodiment, the in-phase feedback loop formed by the first in-phase resistor R102 and the first in-phase reverse feeding resistor R103 determines the input size of the in-phase end of the first audio amplifier U7-D according to the ratio relationship between the two, so as to amplify the audio signal of one pole in the hands-free audio signal received by the in-phase end of the first audio amplifier U7-D, and in the case that the ratio between the first reverse feeding resistor R101 and the first reverse feeding resistor R100 is the same as the corresponding ratio in the in-phase feedback loop, for example, the first in-phase resistor R102 is equal to the first reverse feeding resistor R101, and the first in-phase reverse feeding resistor R103 is equal to the first reverse feeding resistor R100, so as to amplify the audio signals of the positive and negative poles in the hands-free audio signal differentially, that is, the interference signal between the hands-free audio signals of the positive and negative poles is reduced, and the output hands-free voice differential signal is amplified, so that the hands-free voice can be accurately recorded. In another embodiment, the resistance ratios of the second audio differential circuit 120, the audio amplifier differential circuit 200, and the recording control circuit 300 at the non-inverting terminal and the inverting terminal of the amplifier are the same, so that the functions are the same, and are not repeated herein.
In one embodiment, the audio recording circuit further includes a common output capacitor, the output terminal of the audio amplifier differential circuit is connected to a first terminal of the common output capacitor, and a second terminal of the common output capacitor is grounded. In this embodiment, the common output capacitor provides secondary filtering for the output terminal of each circuit, that is, the common output capacitor performs filtering processing on the signals output by the audio circuit and the sound amplifier differential circuit, so as to further ensure that the speech input into the audio memory U6 is clear. In another embodiment, the common output capacitor includes a first common capacitor and a second common capacitor connected in parallel, and the output terminal of the sound amplifier differential circuit is grounded through the first common capacitor and the second common capacitor, respectively. The first common capacitor and the second common capacitor have different capacitance values so as to filter different interference signals, for example, the capacitance value of the first common capacitor is 10PF, and the capacitance value of the second common capacitor is 33 PF.
In one embodiment, the present application further provides a wireless fixed-line telephone including the audio recording circuit according to any of the above embodiments. In this embodiment, the audio recording circuit includes an audio circuit, an audio amplifier differential circuit, and a recording control circuit. The audio circuit includes a first audio differential circuit and a second audio differential circuit. The input end of the first audio frequency differential circuit is used for being connected with the output end of the first radio receiving circuit, and the output end of the first audio frequency differential circuit is connected with the output end of the second audio frequency differential circuit. And the input end of the second audio frequency differential circuit is used for being connected with the output end of the second radio receiving circuit. Wherein, the output end of the first audio frequency differential circuit is used for outputting the hands-free voice differential signal. And the output end of the second audio frequency differential circuit is used for outputting a handle voice differential signal. The input end of the sound amplifier differential circuit is used for being connected with the output end of the sound amplifier circuit, the output end of the sound amplifier differential circuit is connected with the output end of the first audio differential circuit, and the output end of the sound amplifier differential circuit is used for outputting a loud-speaking voice differential signal. The input end of the recording regulation and control circuit is used for being connected with the control end of the recording regulator, the output end of the recording regulation and control circuit is connected with the output end of the first audio frequency differential circuit, and the output end of the recording regulation and control circuit is used for being connected with an audio frequency storage device so as to adjust the voice differential signal transmitted to the audio frequency storage device. Under the action of each differential circuit, the hands-free voice, the handle voice and the loud-speaking voice are subjected to common-mode processing, so that interference signals in the hands-free voice, the handle voice and the loud-speaking voice are reduced, and when the hands are free and the handle is used, accurate voice signals are transmitted to an audio memory to be stored, so that the anti-interference performance of audio recording signals of the audio recording circuit is improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An audio recording circuit, comprising:
the audio circuit comprises a first audio differential circuit and a second audio differential circuit, wherein the input end of the first audio differential circuit is used for being connected with the output end of a first radio circuit, the output end of the first audio differential circuit is connected with the output end of the second audio differential circuit, the input end of the second audio differential circuit is used for being connected with the output end of a second radio circuit, the output end of the first audio differential circuit is used for outputting a hands-free voice differential signal, and the output end of the second audio differential circuit is used for outputting a handle voice differential signal;
the input end of the sound amplification differential circuit is used for being connected with the output end of the sound amplification circuit, the output end of the sound amplification differential circuit is connected with the output end of the first audio differential circuit, and the output end of the sound amplification differential circuit is used for outputting a loud-speaking voice differential signal;
the recording regulation and control circuit, the input of recording regulation and control circuit is used for being connected with the control end of recording regulator, the output of recording regulation and control circuit with the output of first audio frequency difference circuit is connected, the output of recording regulation and control circuit is used for being connected with audio memory to the adjustment to the pronunciation difference signal of audio memory transmission.
2. The audio recording circuit according to claim 1, wherein the first audio differential circuit comprises a first audio amplifier, a first in-phase resistor, a first in-phase capacitor, a first in-phase feedback resistor, a first inverse capacitor and a first inverse feedback resistor, a first output terminal of the first radio receiver circuit is connected to a first terminal of the first in-phase capacitor, a second terminal of the first in-phase capacitor is connected to the in-phase terminal of the first audio amplifier through the first in-phase resistor, and the in-phase terminal of the first audio amplifier is further grounded through the first in-phase inverse feedback resistor; the second output end of the first radio circuit is connected with the first end of the first inverting capacitor, the second end of the first inverting capacitor is connected with the inverting end of the first audio amplifier through the first inverting resistor, and the inverting end of the first audio amplifier is further connected with the output end of the first audio amplifier through the first inverting feedback resistor.
3. The audio recording circuit of claim 2, wherein the first audio differential circuit further comprises a first inverting filter capacitor, wherein an inverting terminal of the first audio amplifier is connected to a first terminal of the first inverting filter capacitor, and wherein a second terminal of the first inverting filter capacitor is connected to ground.
4. The audio recording circuit of claim 2, wherein said first audio differential circuit further comprises a first in-phase filter capacitor, wherein a first end of said first audio amplifier is connected to a first end of said first in-phase filter capacitor, and a second end of said first in-phase filter capacitor is connected to ground.
5. The audio recording circuit of claim 2, wherein the first audio differential circuit further comprises a first pull-up resistor, a first terminal of the first pull-up resistor is configured to be connected to an external reference power source, and a second terminal of the first pull-up resistor is connected to the non-inverting terminal of the first audio amplifier.
6. The audio recording circuit of claim 2, wherein said first audio differential circuit further comprises a first output filter capacitor, wherein an output terminal of said first audio amplifier is connected to a first terminal of said first output filter capacitor, and a second terminal of said first output filter capacitor is connected to ground.
7. The audio recording circuit according to claim 2, wherein the first audio differential circuit further comprises a first low-pass capacitor and a first low-pass resistor, the output terminal of the first audio amplifier is connected to a first terminal of the first low-pass resistor through the first low-pass capacitor, and a second terminal of the first low-pass resistor is connected to the audio receiving terminal of the audio memory.
8. The audio recording circuit of claim 2, wherein a resistance ratio of the first in-phase resistor to the first in-phase feedback resistor is equal to a resistance ratio of the first anti-phase resistor to the first anti-phase feedback resistor.
9. The audio recording circuit according to claim 1, further comprising a common output capacitor, wherein the output terminal of the amplifier differential circuit is connected to a first terminal of the common output capacitor, and a second terminal of the common output capacitor is grounded.
10. A wireless fixed telephone comprising the audio recording circuit of any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122640812.0U CN216313181U (en) | 2021-10-29 | 2021-10-29 | Audio recording circuit and wireless fixed telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122640812.0U CN216313181U (en) | 2021-10-29 | 2021-10-29 | Audio recording circuit and wireless fixed telephone |
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| CN216313181U true CN216313181U (en) | 2022-04-15 |
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