CN115484441B - A multi-mode switching projector - Google Patents
A multi-mode switching projector Download PDFInfo
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- CN115484441B CN115484441B CN202110664359.9A CN202110664359A CN115484441B CN 115484441 B CN115484441 B CN 115484441B CN 202110664359 A CN202110664359 A CN 202110664359A CN 115484441 B CN115484441 B CN 115484441B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L15/00—Speech recognition
- G10L15/26—Speech to text systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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Abstract
本发明涉及投影设备技术领域，具体公开了一种能够根据工作模式自动调节音频参数并进行多模式切换的投影仪，包括具有CPU控制器的主控单元、音频播放单元、视频播放单元及图形均衡器，音频播放单元包括与CPU控制器连接的音频信号处理电路及用于音频播放的扬声器，图形均衡器根据CPU控制器发送的指令调节音频信号处理电路输出的声音信号的频率和音量；CPU控制器接收第一控制指令时，控制视频播放单元工作，并向图形均衡器发送第一信号以控制音频信号处理电路按第一音频模型输出音频信号；CPU控制器接收第二控制指令时，向图形均衡器发送第二信号以控制音频信号处理电路按第二音频模型输出音频信号。
The present invention relates to the technical field of projection equipment, and specifically discloses a projector capable of automatically adjusting audio parameters according to working modes and performing multi-mode switching. The projector comprises a main control unit with a CPU controller, an audio playback unit, a video playback unit and a graphic equalizer. The audio playback unit comprises an audio signal processing circuit connected to the CPU controller and a speaker for audio playback. The graphic equalizer adjusts the frequency and volume of a sound signal output by the audio signal processing circuit according to an instruction sent by the CPU controller. When the CPU controller receives a first control instruction, the video playback unit is controlled to work, and a first signal is sent to the graphic equalizer to control the audio signal processing circuit to output an audio signal according to a first audio model. When the CPU controller receives a second control instruction, the second signal is sent to the graphic equalizer to control the audio signal processing circuit to output an audio signal according to a second audio model.
Description
Technical Field
The invention relates to the technical field of projection equipment, in particular to a projector capable of automatically adjusting audio parameters according to working modes and performing multi-mode switching.
Background
The projector is a device capable of projecting images or videos onto a curtain, and can be connected with a computer, VCD, DVD, BD, a game machine, a DV and other devices through different interfaces so as to play video signals of different signal sources. Early projectors were used only as video projection devices, and required external speakers to play audio signals matched with video, so that users were required to open a plurality of devices for simultaneously acquiring audio and video information, the operation was complicated, and the audiovisual cost was high. Through technological innovation, the projector has become the novel play device of collection video and audio play in an organic whole at present, compares in traditional TV set, and the projector size is less, portable, and the requirement to the broadcast scene is lower, can show on the wall body or curtain or other barriers in real time projection, has reduced the film-viewing degree of difficulty.
However, the audio playing module of the traditional projector is only used for cooperating with the video playing module, namely playing audio signals while video is being shown, the projector cannot play audio independently, and the requirements of users on various working modes of the projector are difficult to meet, in addition, the audio parameters of the traditional projector are required to be manually adjusted by the users according to the requirements of the users, the operation is complicated, and the audio playing module is unfavorable for improving the audio-visual experience of the users.
Disclosure of Invention
Based on this, it is necessary to provide a projector capable of automatically adjusting audio parameters according to the operation mode and performing multi-mode switching, aiming at the technical problems that the projector has a single function and needs to manually adjust the audio parameters.
The projector comprises a main control unit with a CPU controller, an audio playing unit, a video playing unit and a graphic equalizer, wherein the video playing unit is connected with the CPU controller, the audio playing unit comprises an audio signal processing circuit connected with the CPU controller and a loudspeaker for receiving the signal output of the audio signal processing circuit and playing audio, and the graphic equalizer is used for adjusting the frequency and volume of a sound signal output by the audio signal processing circuit according to an instruction sent by the CPU controller;
When the CPU controller receives a first control instruction, the video playing unit is controlled to work, and a first signal is sent to the graphic equalizer, so that the graphic equalizer controls the audio signal processing circuit to output an audio signal according to a first audio model so as to enter a projection working mode;
and when receiving a second control instruction, the CPU controller sends a second signal to the graphic equalizer, so that the graphic equalizer controls the audio signal processing circuit to output an audio signal according to a second audio model so as to enter an acoustic working mode.
In one embodiment, the frequency-volume curve of the first audio model is in a saddle-shaped structure, the frequency of the first audio model is a narrow-band frequency ranging from 400Hz to 2.3KHz, the frequency-volume curve of the second audio model is reduced to a valley point after the volume of a bass region is gradually increased, then the frequency-volume curve is increased, the volume of the treble region is continuously increased, and the volume of the frequency-volume curve of the first audio model before the first time of reduction and after the second time of reduction is higher than the volume of the frequency-volume curve of the second audio model at the corresponding frequency.
In one embodiment, the projector further includes a voice acquisition module, where the voice acquisition module is configured to acquire a sound signal in an environment and perform noise reduction processing on the sound signal.
In one embodiment, the voice acquisition module is a microphone array.
In one embodiment, the main control unit further comprises a voice recognition module and a keyword recognition module, wherein the voice recognition module is used for converting voice information after noise reduction processing into text information, a voice database containing a plurality of keywords is built in the keyword recognition module, the keyword recognition module is used for receiving the text information sent by the voice recognition module and carrying out matching recognition, and when the text information is matched with any preset keyword in the voice database, the keyword recognition module sends a first control instruction or a second control instruction to the CPU controller.
In one embodiment, the projector further comprises one or two instruction controls, wherein when the number of the instruction controls is one, the instruction controls respectively send a first control instruction and a second control instruction to the CPU controller under different operation conditions, and when the number of the instruction controls is two, the two instruction controls respectively send the first control instruction and the second control instruction to the CPU controller under preset operation conditions.
In one embodiment, the projector further comprises an atmosphere lamp module, the atmosphere lamp module comprises a voltage dividing resistance adjusting circuit connected with the CPU controller, an LED driving circuit connected with the voltage dividing resistance adjusting circuit and a lamp group circuit connected with the LED driving circuit, and the CPU controller sends an electric signal to the voltage dividing resistance adjusting circuit when receiving a second control instruction and sequentially controls the LED driving circuit and the lamp group circuit to work so as to project the atmosphere lamp.
In one embodiment, the projector further comprises a data interface connected to the CPU controller, the data interface supporting both HDMI and MHL interfaces.
In one embodiment, the projector further comprises a communication module connected with the CPU controller, and the communication module is in communication connection with an external intelligent mobile device or a background server through a serial peripheral interface.
In one embodiment, the video playing unit includes a DMD for receiving video signals transmitted by the CPU controller and performing data processing.
According to the projector realizing the multimode switching, the graphic equalizer is arranged in the projector, the first audio model and the second audio model are preset, and when the CPU controller of the projector receives different control instructions in the working process of the projector, the video playing unit and the audio playing unit are controlled to work simultaneously to enter a projection working mode, or the audio playing unit is controlled to work independently to enter an acoustic working mode, and the sound signal output rule of the audio playing unit is different in different working modes of the projector, so that the sound effect emphasis point in different working modes is close to the user requirement, and therefore, the projector can be used for audio and video playing, can replace sound, can meet the requirement of users on audio and visual effects in different working modes without manual adjustment of working parameters of the projector, and is beneficial to improving the market competitiveness of products.
Drawings
Fig. 1 is a schematic block diagram of a projector according to an embodiment of the invention;
FIG. 2 is a frequency-volume curve comparison diagram of a first audio model and a second audio model according to an embodiment of the present invention;
FIG. 3 is a logic diagram of mode switching for a projector according to one embodiment of the invention;
FIG. 4 is a schematic circuit diagram of a microphone array in one embodiment of the invention;
FIG. 5 is a schematic circuit diagram of an audio signal processing circuit according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a divider resistance adjustment circuit in accordance with one embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of an LED driver circuit in one embodiment of the invention;
FIG. 8 is a schematic circuit diagram of a lamp bank circuit in an embodiment of the invention;
FIG. 9 is a schematic circuit diagram of a master control loop according to an embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a DMD driver circuit in an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
The invention provides a projector 10 capable of automatically adjusting audio parameters according to working modes and performing multi-mode switching, in particular to a projector, which is characterized in that a graphic equalizer 400 is arranged in the projector, and audio models in different working modes are preset, so that an audio playing unit 200 works with audio parameters with different characteristic rules in different working modes, and the audio effect during audio playing is adapted to the working modes of the projector, thereby improving the audio-visual experience of users.
Referring to fig. 1, the multimode switched projector 10 of the present invention includes a main control unit 100 having a CPU controller 110, an audio playing unit 200 for audio playing, a video playing unit 300 connected to the CPU controller 110 and used for video playing, and a graphic equalizer 400, wherein the audio playing unit 200 includes an audio signal processing circuit 210 connected to the CPU controller 110 and a speaker 220 for receiving signal output of the audio signal processing circuit 210 and performing audio playing, the graphic equalizer 400 is used for adjusting frequency and volume of sound signals output by the audio signal processing circuit 210 according to instructions sent by the CPU controller 110, the CPU controller 110 controls the video playing unit 300 to operate when receiving first control instructions and sends first signals to the graphic equalizer 400, so that the graphic equalizer 400 controls the audio signal processing circuit 210 to output audio signals according to a first audio model EQ1 to enter a projection operation mode, and the CPU controller 110 sends second signals to the graphic equalizer 400 when receiving second control instructions, so that the graphic equalizer 400 controls the audio signal processing circuit 210 to output audio signals according to a second audio model EQ2 to enter an acoustic operation mode. In this way, the projector adjusts the audio parameters according to different audio models in different working modes, so that the sound effect of the projector is adapted to the working modes.
Referring to fig. 2, fig. 2 shows a comparison of the frequency-volume curves (i.e., EQ curves) of the first audio model EQ1 and the second audio model EQ2, and the frequency-volume curve (e.g., curve a in fig. 2) of the first audio model EQ1 is in a saddle-shaped structure, i.e., the frequency-volume curve of the first audio model EQ1 gradually increases to a first volume peak value at a low frequency and then decreases to a first volume valley value, and then continuously decreases after again increasing to a second volume peak value, and the frequency-volume curve of the first audio model EQ1 undergoes two-time rising and two-time decreasing processes. Further, the frequency of the first audio model EQ1 is a narrow-band frequency between 400Hz-2.3 KHz. In this way, when the CPU controller 110 receives the first control instruction and switches the working mode of the projector to the projection working mode, the audio signal processing circuit 210 outputs at a lower volume in the bass region, so as to facilitate the matching of audio and video, and avoid the user from focusing too much on the audio, in other words, the setting of the first audio model EQ1 improves the tone brightness of the projector in the projection mode. The frequency-volume curve of the second audio model EQ2 (e.g., curve b in fig. 2) decreases to the valley point after the volume of the bass region gradually increases, and then increases, and the volume of the treble region continuously increases, and the frequency-volume curve of the first audio model EQ1 before the first decrease and after the second decrease is higher than the frequency-volume curve of the second audio model EQ2 at the corresponding frequency. Thus, when the projector is switched to the sound working mode, the volume of the sound signal output by the speaker 220 is higher in the low frequency section, and the volume is continuously increased when the projector enters the high frequency section, so that the projector can improve the bass force in the bass region and improve the sound permeability in the treble region, thereby meeting the requirements of the projector on the sound effect when in the sound working mode.
Referring to fig. 3, the control command input of the projector according to the present embodiment may be implemented in two ways, one by a mode switch (i.e., command control 500), and the other by voice recognition. In the case of inputting control instructions using a mode switch, the projector includes one or two instruction controls 500, and when the number of instruction controls 500 is one, the instruction controls 500 respectively transmit a first control instruction and a second control instruction to the CPU controller 110 under different operation conditions, and when the number of instruction controls 500 is two, the two instruction controls 500 respectively correspondingly transmit the first control instruction and the second control instruction to the CPU controller 110 under predetermined operation conditions. That is, the user may input different instructions to the CPU controller 110 by using a plurality of different controls, or may access a switch corresponding to the same control to a plurality of control circuits, and the purpose of inputting different instructions to the CPU controller 110 is achieved by operating the same instruction control 500.
When the control instruction is acquired by adopting the voice recognition mode, the projector further comprises a voice acquisition module 600, and the voice acquisition module 600 is used for acquiring a sound signal in the environment and performing noise reduction processing on the sound signal. Preferably, the voice acquisition module 600 is a microphone array. The microphone array is a system which is composed of a plurality of acoustic sensors and is used for sampling and processing the spatial characteristics of a sound field, in the frequency response of the microphone array, according to the application of beam forming in a time domain and the similarity of a spatial filter, the direction of a sound source of a received voice signal and the change of the direction are analyzed, the strength and the angle of the voice signal can be displayed in a beam form by a polar coordinate graph through the analysis, the sound wave can be filtered by utilizing the difference between the phases of the sound waves received by two microphones, the environmental background sound can be removed to the greatest extent, and only the needed sound waves are remained, so that the aim of collecting effective sound signals in a noisy environment can be fulfilled.
Referring to fig. 4, in the present embodiment, the microphone array includes two voice acquisition circuits, each of which includes a microphone for picking up an environmental sound signal, and the environmental sound signal picked up by the microphone is processed by a filter circuit composed of a capacitor and an inductor and then output by a relay J552 under the action of an electrostatic protection circuit, so as to obtain a target sound wave for eliminating environmental noise.
Further, the main control unit 100 further includes a voice recognition module 120 and a keyword recognition module 130, the voice recognition module 120 is configured to convert voice information after noise reduction processing into text information, a voice database including a plurality of keywords is built in the keyword recognition module 130, the keyword recognition module 130 is configured to receive the text information sent by the voice recognition module 120 and perform matching recognition, and when the text information is matched with any preset keyword in the voice database, the keyword recognition module 130 sends a first control instruction or a second control instruction to the CPU controller 110. Preferably, the voice database includes a primary word library and a secondary word library, the primary word library includes single word verbs or nouns related to projector operation modes such as "listen", "watch", "look", "shadow", "sound" and "voice", and the secondary word library also stores auxiliary verbs, verbs or nouns directly related to mode switching for expressing willingness or result, such as "want to listen", "switch to watch", "watch" and other related phrases, so after the voice information is converted into the word information, the keyword recognition module 130 first compares the word information with the voice data in the primary word library, if the word information does not match with the voice data in the primary word library, the keyword recognition module 130 outputs a signal "0", and the CPU controller 110 does not execute the corresponding mode switching operation. If the text information matches one or more of the voice data in the primary word stock, the voice recognition module 120 further performs matching recognition on the matched field and the voice data in the secondary word stock, and only when the matched field matches any voice data in the secondary word stock once, the keyword recognition module 130 outputs a signal "1" so that the CPU controller 110 performs a corresponding action. Specifically, the CPU controller 110 first determines whether the target operation mode matches the current operation mode, if so, the CPU controller 110 does not send an operation command to the video playback unit 300 or/and the audio playback unit 200, that is, the current operation mode is still maintained, and if not, the CPU controller 110 sends an operation command to the video playback unit 300 or/and the audio playback unit 200, and simultaneously sends an electrical signal to the graphic equalizer 400 to switch the operation mode of the projector.
Referring to fig. 5, the audio signal processing circuit 210 of the present embodiment includes a DSP & AMP chip, which has the advantages of both a DSP (DIGITAL SIGNAL Process) chip and an AMP chip, and can perform digital signal processing, and has a separate haverse structure of program and data, a special hardware multiplier, a pipeline operation, and a special DSP instruction, which can be used to quickly implement various digital signal processing algorithms, and an amplifier, which can amplify data signals.
Referring to fig. 1, 6, 7 and 8, in an embodiment, the projector further includes an atmosphere lamp module 700, the atmosphere lamp module 700 includes a voltage dividing resistance adjusting circuit connected to the CPU controller 110, an LED driving circuit connected to the voltage dividing resistance adjusting circuit, and a lamp group circuit connected to the LED driving circuit, and when receiving the second control command, the CPU controller 110 sends an electrical signal to the voltage dividing resistance adjusting circuit and sequentially controls the LED driving circuit and the lamp group circuit to operate, so as to perform atmosphere lamp projection. The voltage dividing resistance regulating circuit is connected with a POWER supply circuit of the projector through an LED_POWER_EN pin, is connected with an LED driving circuit through an LED_ ADODE pin, is used for reducing the voltage transmitted by the POWER supply circuit and is adapted to the working voltage of the LED lamp group, the LED driving circuit comprises a POWER chip with a model of MO8888 QFN28, namely U6 in FIG. 6, the lamp group circuit comprises a plurality of lamp beads arranged on a lamp panel, and particularly comprises red, green and blue lamp beads, and the POWER chip is also connected with a clock through an SCL/SCLK pin and is used for controlling the time or period of lamp bead flickering. When the projector is switched to the sound operation mode, the CPU controller 110 sends an electrical signal to the voltage dividing resistor adjusting circuit, and causes the LED driving circuit to control each of the light beads to be turned on according to a predetermined rule, for example, the light beads are turned on according to a predetermined sequence, and the time for turning on the single light bead and the time between two times of turning on are limited, which can, of course, increase the number of the light beads or change the color of the light beads according to actual needs, so as to meet the audiovisual requirement of the user in the sound operation mode.
In this embodiment, the CPU controller 110 and its peripheral components form a main control loop, referring to fig. 1 and 9, the projector further includes a data interface 800 connected to the CPU controller 110, and the data interface 800 supports dual interfaces of HDMI and MHL. The HDMI interface is a Definition multimedia interface (High Definition Multimedia Interface), is a digital video/audio interface technology, is a special digital interface suitable for image transmission, can simultaneously transmit audio and image signals, has a highest data transmission speed of 2.25GB/s, does not need digital/analog or analog/digital conversion before signal transmission, is a Mobile terminal High Definition Link (MHL) namely a Mobile terminal High Definition video standard interface, is a video standard interface connected with a portable consumer electronic device, and can be displayed on a High Definition television through a standard HDMI input interface by using only one signal cable. Through integrating HDMI interface and MHL interface on same data interface 800, the user can select corresponding connecting wire to peg graft at data interface 800 as required and realize data transfer, has reduced the interface quantity on the projecting apparatus, is favorable to carrying out the molding to the external structure of projecting apparatus more.
Further, the projector further includes a communication module 900 connected to the CPU controller 110, where the communication module 900 is communicatively connected to an external smart mobile device or a background server through a serial peripheral interface. Preferably, the communication module 900 is a WIFI signal transceiver, so that the CPU controller 110 can periodically load audio or/and video from a background server through the communication module 900 to update the audio/video playing source in the projector in real time. In addition, the user can send a control instruction to the CPU controller 110 through the intelligent mobile terminal such as the mobile phone or the tablet personal computer connected with the communication module 900 to remotely control the projector, and can load the related application APP on the intelligent mobile terminal such as the mobile phone, wherein the APP is associated with the background server, so that the user can perform identity authentication by inputting the password of the corresponding account in the APP, and realize account binding with the background server, so as to obtain the audio/video rights, and further load the audio/video into the CPU controller 110 of the projector through the operation in the mobile phone APP, so as to increase the playing source of the projector.
In one embodiment, the video playing unit 300 includes a DMD for receiving video signals transmitted from the CPU controller 110 and performing data processing, and in particular, the DMD is used for adjusting the definition, brightness and contrast of a predetermined image and outputting projection light with specified parameters. When the projector enters a projection operation mode, the LCD screen of the video playing unit 300 displays a predetermined image under the control of the CPU controller 110, and at the same time, light generated when the light source in the video playing unit 300 operates passes through the LCD screen and projects the predetermined image on the LCD screen onto the DMD to output projection light of predetermined image parameters. The LCD screen includes two parallel glass substrates, a liquid crystal cell disposed between the two glass substrates, a TFT (thin film transistor) disposed on one of the glass substrates, and a color filter disposed on the other glass substrate, and when the LCD screen is operated under the action of the CPU controller 110, signals and voltages transmitted to the TFT by the CPU controller 110 are changed, so as to control the rotation direction of liquid crystal molecules in the liquid crystal cell, thereby achieving the purpose of controlling whether polarized light of each pixel point is emitted or not, and displaying images. The digital micromirror device chip can be regarded as a semiconductor optical switch with hundreds of thousands or millions of micromirrors arranged therein, each micromirror represents a pixel, the conversion rate is up to 1000 times/second, and a rotating device similar to a hinge is arranged below the digital micromirror device chip for conveniently adjusting the direction and the angle. The rotation of the micromirror is controlled by digital drive signals from the CMOS RAM. When a digital signal is written to the SRAM, the static electricity activates the address electrode, the mirror plate, and the yoke plate to cause the hinge device to rotate. Upon receipt of the corresponding signal, the lens is tilted by 10 ° and by +12° with the digital signal from the SRAM, e.g. the microscope lens is in the non-projection state, shown as "off" and tilted by-12 °. In short, the DMD works by reflecting required light by means of a micromirror device, and simultaneously absorbing unnecessary light by a light absorber to achieve projection of an image, so as to achieve the purposes of adjusting the definition, brightness and contrast of a predetermined image and outputting projection light with specified parameters.
Referring to fig. 10, the projector further includes a DMD driving circuit for controlling the DMD of the digital micromirror device, the DMD driving circuit includes a relay J12, 15 pins connected to diodes, such as dmd_d0-dmd_d14, are disposed on the relay J12, the DMD driving circuit further includes a plurality of sub-circuits for adjusting dmd_vref, dmd_vcc, dmd_vbias, dmd_vrst, and dmd_ VOFS, each of the sub-circuits is connected to 50 pins, 9 pins, 38 pins, 42 pins, and 48 pins of the relay J12, wherein the sub-circuits for adjusting dmd_vbias, dmd_vrst, and dmd_ VOFS respectively include two parallel capacitors, the voltage is processed by an inductor FB134 before being connected to the sub-circuits for adjusting dmd_vcc, and then is further processed by the inductor FB134, and the two capacitors are connected in series and parallel to the inductor in parallel to implement a filtering process for the reference voltage.
In the projector 10 implementing the multi-mode switching of the present invention, by setting the graphic equalizer 400 in the projector and presetting the first audio model EQ1 and the second audio model EQ2, when the CPU controller 110 of the projector receives different control instructions in the working process of the projector, the CPU controller simultaneously controls the video playing unit 300 and the audio playing unit 200 to work to enter a projection working mode, or separately controls the audio playing unit 200 to work to enter an audio working mode, and the audio signal output rule of the audio playing unit 200 is different in different working modes of the projector, so that the sound effect side emphasis in different working modes is close to the user requirement, and the projector can be used for audio and video playing, can replace audio, can meet the requirement of the user on the sound effect in different working modes without manually adjusting the working parameters of the projector, and is favorable for improving the audiovisual experience of the user and the market competitiveness of the product.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. The projector is characterized by comprising a main control unit with a CPU controller, an audio playing unit, a video playing unit and a graphic equalizer, wherein the video playing unit is connected with the CPU controller, the audio playing unit comprises an audio signal processing circuit connected with the CPU controller and a loudspeaker for receiving the signal output of the audio signal processing circuit and playing audio, and the graphic equalizer is used for adjusting the frequency and volume of a sound signal output by the audio signal processing circuit according to an instruction sent by the CPU controller;
When the CPU controller receives a first control instruction, the video playing unit is controlled to work, and a first signal is sent to the graphic equalizer, so that the graphic equalizer controls the audio signal processing circuit to output an audio signal according to a first audio model so as to enter a projection working mode;
When the CPU controller receives a second control instruction, a second signal is sent to the graphic equalizer, so that the graphic equalizer controls the audio signal processing circuit to output an audio signal according to a second audio model to enter an acoustic working mode;
The frequency-volume curve of the first audio model is in a saddle-shaped structure, the frequency of the first audio model is a narrow-band frequency ranging from 400Hz to 2.3KHz, the frequency-volume curve of the second audio model is lowered to a valley point after the volume of a bass region is gradually raised, then the frequency-volume curve is raised, the volume of the treble region is continuously raised, and the volume of the frequency-volume curve of the first audio model before the first lowering and after the second lowering is higher than the volume of the frequency-volume curve of the second audio model under the corresponding frequency;
The system also comprises a voice acquisition module, wherein the voice acquisition module is used for acquiring sound signals in the environment and carrying out noise reduction treatment on the sound signals;
The key word recognition module is used for receiving the text information sent by the voice recognition module and carrying out matching recognition, and when the text information is matched with any preset key word in the voice database, the key word recognition module sends a first control instruction or a second control instruction to the CPU controller.
2. The multimode switched projector of claim 1, wherein the voice acquisition module is a microphone array.
3. The multimode switched projector of claim 1, further comprising one or two command controls, wherein when the number of command controls is one, the command controls respectively send a first control command and a second control command to the CPU controller under different operating conditions, and when the number of command controls is two, the two command controls respectively send the first control command and the second control command to the CPU controller under predetermined operating conditions.
4. The projector according to claim 3, further comprising an atmosphere lamp module including a voltage dividing resistance adjusting circuit connected to the CPU controller, an LED driving circuit connected to the voltage dividing resistance adjusting circuit, and a lamp group circuit connected to the LED driving circuit, wherein the CPU controller sends an electric signal to the voltage dividing resistance adjusting circuit when receiving a second control instruction, and sequentially controls the operation of the LED driving circuit and the lamp group circuit to perform atmosphere lamp projection.
5. The multimode switched projector of claim 1, further comprising a data interface connected to the CPU controller, the data interface supporting both HDMI and MHL interfaces.
6. The multimode switched projector of claim 1, further comprising a communication module coupled to the CPU controller, the communication module communicatively coupled to an external smart mobile device or a background server via a serial peripheral interface.
7. The multimode switched projector of claim 1, wherein the video playback unit includes a digital micromirror device DMD for receiving video signals sent by the CPU controller and performing data processing.
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| CN101827236A (en) * | 2010-04-07 | 2010-09-08 | 深圳创维－Rgb电子有限公司 | Sound accompaniment output control method, sound equalizer and audio play equipment |
| CN106791738A (en) * | 2016-11-11 | 2017-05-31 | 微鲸科技有限公司 | Audio play control method and projector |
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