CN117395565A - Active sound box circuit architecture capable of eliminating high-frequency tooth sound - Google Patents

Abstract

The invention discloses an active sound box circuit architecture capable of eliminating high-frequency tooth sound, and relates to the technical field of sound box circuits. The circuit comprises a microphone and guitar input pre-stage processing module, a delay reverberation module, a Bluetooth and auxiliary audio input module, a mixed audio processing module, a PORT analog recording and playing exchange and OTG data exchange module, an audio tooth sound detection module, a power amplifier input/output module and the like. Wherein: microphone and guitar input preceding processing module, delay reverberation module, bluetooth and supplementary audio input module, mixed audio processing module, PORT analog recording and broadcast exchange and OTG data exchange module, audio frequency tooth sound detection module, power amplifier input output module connect gradually, and the audio amplifier can produce too high tooth sound in the use sometimes, and this circuit has solved the audio amplifier in the use, and the problem of very harshness high frequency sound that produces is sometimes too high to the tooth sound.

Description

Active sound box circuit architecture capable of eliminating high-frequency tooth sound

Technical Field

The invention relates to the technical field of sound box circuits, in particular to an active sound box circuit framework capable of eliminating high-frequency tooth sound.

Background

The loudspeaker is the terminal of the overall sound system and functions to convert audio electrical energy into corresponding acoustic energy and radiate it into space. It is an extremely important component of sound systems, which is responsible for the task of converting electrical signals into acoustic signals for direct listening by a person's ears. Wherein the active speaker is also referred to as an "active speaker". Generally, it refers to a sound box with a power amplifier, such as a multimedia computer sound box, an active ultra-low sound box, and some new home theater active sound boxes. Because the active sound box is internally provided with the power amplifier circuit, a user does not need to consider the problem of matching with the amplifier, and meanwhile, the active sound box is convenient to directly drive by using lower-level audio signals.

However, the sound box can generate tooth sound in the use process, and extremely harsher high-frequency sound can be generated by too high tooth sound, so that the tone quality and the hearing of the sound box are affected.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an active sound box circuit framework capable of eliminating high-frequency tooth sound, which solves the problem that the sound box can generate tooth sound in the use process and extremely harsher high-frequency sound can be generated due to too high tooth sound.

In order to achieve the above purpose, the invention is realized by the following technical scheme: an active sound box circuit structure capable of eliminating high-frequency tooth sound comprises a microphone and guitar input front-stage processing module, a delay reverberation module, a Bluetooth and auxiliary audio input module, a mixed audio processing module, a PORT analog recording and playing exchange and OTG data exchange module, an audio tooth sound detection module and a power amplifier input/output module, wherein: the microphone and guitar input pre-stage processing module, the delay reverberation module, the mixed audio processing module, the PORT analog recording and playing exchange and OTG data exchange module, the audio tooth sound detection module and the power amplifier input and output module are connected in sequence; the microphone and guitar input pre-stage processing module comprises a microphone input processing unit and a guitar input processing unit, and the microphone input processing unit and the guitar input processing unit are connected with the delayed reverberation module.

Further, the microphone input processing unit comprises a TRS input port, an XLR differential input port and an adder U111A unit which are respectively connected with the adder U111A unit through an amplifier circuit, the microphone input processing unit is connected with a microphone frequency band equalizing unit after being amplified, the microphone equalizing unit is connected with a capacitor C540, the capacitor C540 is connected with a delay reverberation module, and the TRS input port and the XLR differential input port adopt composite ports; the guitar input processing unit comprises a TRS input port, the TRS input port is connected with the adder U121A unit through an amplifier circuit and is connected with the guitar frequency band balancing unit after being amplified, the guitar frequency band balancing unit is connected with the capacitor C541, and the capacitor C541 is connected with the delay reverberation module.

Further, the input sensitivity of the TRS in the TRS & XLR composite input port of the microphone input processing unit is-40 db, the input sensitivity of the XLR differential input port is-46 db, and the input sensitivity of the TRS input port of the guitar input processing unit is-12 db.

Further, the microphone band equalization unit includes three series connected varistors VR112-VR114 and the guitar band equalization unit includes three parallel connected varistors VR122-VR124.

Further, the chip adopted by the delay reverberation module is JL7016C, the capacitor C540 is connected with the PA9 pin of the chip JL7016C, the capacitor C541 is connected with the PA0 pin of the chip AC7016C, the PB1 pin of the chip JL7016C is a microphone delay reverberation effect AD port, and the PB3 pin of the chip JL7016C is a guitar delay reverberation effect AD port.

Further, the chip adopted by the bluetooth and auxiliary audio input module is AC6956F, the bluetooth and auxiliary audio input module includes a usb_mp3 playing port and an AUX input port, the usb_mp3 playing port and the AUX input port are both connected with the chip AC6956F, pins PB9-PB11 of the chip AC6956F respectively correspond to NEXT, P/P, PREV of bluetooth and MP3 playing, pins PC3-PC5 of the chip AC6956F respectively correspond to PREV function indication LEDs, P/P, NEXT of bluetooth and MP3 playing, pins PA0 and PA9 of the chip AC6956F respectively correspond to left and right signal inputs of the AUX input port, PA10 of the chip AC6956F can interrupt bluetooth playing or MP3 playing detection port when inserting the AUX signal, and DARP, DARN, DALP, ln of the chip AC6956F form differential output to U204 for differential amplification output.

Further, the chip adopted by the OTG data exchange module is AC6956F, the DARP pin of the chip AC6956F corresponds to amp_lin and outputs to the audio tooth sound detection module, the DARN pin of the chip AC6956F corresponds to amp_rin and outputs to the audio tooth sound detection module, and the audio tooth sound detection module amplifies the power of the input signal and outputs the amplified signal; the DARP/DARN pins and the DALP/DALN pins of the chip AC6956F are defined as differential outputs, wherein the DARP/DARN pins respectively correspond to HR_AMP_LIN and HE_AMP_RIN and are output to a headset output and a power amplifier output; the output of the audio tooth sound detection module is connected with the PA10 pin of the chip AC 6956F.

Further, the OTG data exchange module further includes a LIVE unit, where the LIVE unit is connected to the power amplifier input/output module, and the DALP/DALN pins respectively correspond to otg_ro and otg_lo, and are used as usb conversion circuits.

Further, the audio tooth sound detection module is connected with the power amplifier input/output module through hr_amp_lin and hr_amp_rin, and receives a mixed audio signal, the audio tooth sound detection module includes an adder U301B, U303A, U106B, U202A, U B, the adder U301B, U303A, U106B, U202A, U B is sequentially connected, and the audio tooth sound detection module further includes an RC network disposed on the adder U301B, U303A, U38106B, U202A, U B.

Further, the Q value of the RC network of the audio tooth sound detection module is 12db, and the bandwidth is 2582 Hz-5910 Hz.

The invention has the following beneficial effects:

the active sound box circuit architecture capable of eliminating high-frequency tooth sound is characterized in that the microphone and guitar input pre-stage processing module, the delay reverberation module, the Bluetooth and auxiliary audio input module, the mixed audio processing module, the power amplifier input and output module, the PORT analog recording and playing exchange and OTG data exchange module and the audio tooth sound detection module are used for identifying and eliminating the high-frequency tooth sound, and when tooth sound frequency high and Odb are detected, the internal algorithm divides audio tooth audio frequency band audio into two paths for processing. One path is kept unchanged, the other path is taken out as an algorithm to reach the phase, the phase offset is carried out on the audio frequency processing after the phase offset and the original unprocessed tooth audio frequency section, and the offset part only offsets the tooth audio frequency section higher than 0db (1V). Ensures that the audio frequency reduction degree is kept to the highest, and solves the problem that the loudspeaker box can generate tooth sound in the use process and extremely harsher high-frequency sound can be generated due to the too high tooth sound.

Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.

Drawings

FIG. 1 is a block diagram of an active speaker circuit architecture for eliminating high frequency tooth tones in accordance with the present invention;

FIG. 2 is a circuit diagram of a microphone and guitar input pre-processing module of the present invention;

FIG. 3 is a circuit diagram of a delay reverberation module according to the present invention;

FIG. 4 is a circuit diagram of a Bluetooth and auxiliary audio input module according to the present invention;

FIG. 5 is a circuit diagram of an OTG data exchange module according to the present invention;

FIG. 6 is a circuit diagram of an audio tooth sound detection module according to the present invention;

fig. 7 is a circuit structure diagram of the power amplifier input/output module of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "open," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like indicate orientation or positional relationships, merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1, the embodiment of the invention provides a technical scheme: an active sound box circuit structure capable of eliminating high-frequency tooth sound comprises a microphone and guitar input front-stage processing module, a delay reverberation module, a Bluetooth and auxiliary audio input module, a mixed audio processing module, a PORT analog recording and playing exchange and OTG data exchange module, an audio tooth sound detection module and a power amplifier input/output module, wherein: the microphone and guitar input pre-stage processing module, the delay reverberation module, the mixed audio processing module, the PORT analog recording and playing exchange and OTG data exchange module, the audio tooth sound detection module and the power amplifier input and output module are connected in sequence; the microphone and guitar input pre-stage processing module comprises a microphone input processing unit and a guitar input processing unit, and the microphone input processing unit and the guitar input processing unit are connected with the delay reverberation module.

Specifically, as shown in fig. 2, the microphone input processing unit includes a TRS input port, an XLR differential input port, and is connected to the adder U111A unit through an amplifier circuit, and is connected to the microphone band equalizing unit after being amplified, the microphone equalizing unit is connected to the capacitor C540, the capacitor C540 is connected to the delayed reverberation module, and the TRS input port and the XLR differential input port are composite ports; the guitar input processing unit comprises a TRS input port, the TRS input port is connected with the adder U121A unit through an amplifier circuit, the amplified TRS input port is connected with the guitar frequency band equalizing unit, the guitar frequency band equalizing unit is connected with the capacitor C541, and the capacitor C541 is connected with the delay reverberation module.

The microphone band equalization unit includes three series connected varistors VR112-VR114 and the guitar band equalization unit includes three parallel connected varistors VR122-VR124.

In this embodiment, mic_sin in the circuit is TRS input, M ic_p & M ic_n is a differential input of a karton XLR, the TRS input and XLR input form an adder in an opamp_u111A unit 2PIN input, the adder is amplified to 0db by the circuit and then output to a DSP AC7016C through a C540 for relevant DELAY & REVERB (DELAY and reverberation) processing, wherein VR112, VR113, VR114 form a three-way EQ (equalizer) of a M ICROPHONE CHANNEL (microphone channel) circuit, that is, a microphone channel equalizing unit, and a user adjusts a relevant potentiometer as required. The three-section EQ of high, middle and low is +/-12db of lifting and damping.

The GUITAR_IN is TRS input, amplified to 0db by the circuit, and output to the DSP JL7016C via C541 for relevant DELAY & REVERB processing. The VR122, VR123, VR124 form a three-way EQ (equalizer) of the GUITAR CHANNEL circuit, that is, a GUITAR CHANNEL equalizing unit, and a user adjusts the related potentiometer according to the need. The three-section EQ of high, middle and low is +/-12db of lifting and damping.

The TRS & XLR card dragon composite input terminal is a component commonly used for connecting with audio equipment, and is a connector for transmitting audio signals, and the card dragon XLR is generally a differential input/output. The differential input in the circuit architecture is to differentially amplify the phase inverted signals of the two input ends. So-called common mode rejection, i.e. differential amplification of the audio signal, the non-audio signal phases cancel each other out in opposite directions.

Specifically, to the TRS & XLR Kaglong composite input terminal, the input sensitivity of the TRS input port in the microphone input unit is-40 db, and the input sensitivity of the XLR differential input port is-46 db.

The guitar input terminal is a TRS input terminal, and the input sensitivity of the TRS input port of the guitar input processing unit is-12 db.

In this embodiment, the microphone typically produces a lower audio signal level, and therefore a higher input sensitivity is required to properly amplify these signals for subsequent processing, so the input sensitivity is set to-40 dB to ensure that the audio device can capture the signal from the microphone.

XLR connections are commonly used in professional audio devices, such as professional microphones, which typically provide a higher signal-to-noise ratio and a low noise level, so that lower input sensitivity can be used to avoid signal overload, and furthermore XLR differential inputs can also provide better noise suppression capability, so that lower sensitivity settings can be used.

Guitars typically provide relatively high audio signal levels, and therefore require low input sensitivity to avoid signal overload, so the input sensitivity is set to-12 dB to accommodate the characteristics of the guitar signal.

Specifically, as shown in fig. 3, the chip adopted by the delay reverberation module is JL7016C, the capacitor C540 is connected with the PA9 pin of the chip JL7016C, the capacitor C541 is connected with the PA0 pin of the chip JL7016C, the PB1 pin of the chip JL7016C is a microphone delay reverberation effect AD port, and the PB3 pin of the chip JL7016C is a guitar delay reverberation effect AD port.

In this embodiment, MICROPHONE & GUITAR (MICROPHONE and GUITAR) signals are amplified by OPAMP and then input to U124 DSP AC7016 for processing via C540& C541, respectively. Wherein U124 DSP PB1& PB3 correspond to DELAY & REVERB effect AD ports in MICROPHONEs (MICROPHONEs), respectively. DSPPB8& PB10 correspond to DELAY & REVERB effects AD ports in GUITAR (GUITAR), respectively.

Specifically, as shown in fig. 4, the chip adopted by the bluetooth and auxiliary audio input module is AC6956F, the bluetooth and auxiliary audio input module includes a usb_mp3 playing port and an AUX input port, both the usb_mp3 playing port and the AUX input port are connected with the chip AC6956F, pins PB9-PB11 of the chip AC6956F respectively correspond to NEXT and P/P, PREV of bluetooth and MP3 playing, pins PC3-PC5 of the chip AC6956F respectively correspond to PREV function indication LEDs in bluetooth and MP3 playing, P/P, NEXT, pins PA0 and PA9 of the chip AC6956F respectively correspond to left and right signal input of the AUX input port, PA10 of the chip AC6956F can interrupt bluetooth playing or MP3 playing detection port when inserting the AUX signal, and DARP, DARN, DALP and DALN of the chip AC6956F form differential output to the U204 for differential amplification output.

In this embodiment, the USB_MP3 play and AUX inputs in the circuit are processed by AC6956F and output with Bluetooth signals via the user's selection of which audio signal. PB9, PB10 and PB11 correspond to Bluetooth and MP3 play NEXT and P/P, PREV respectively. PC5, PC4, PC3 correspond to the NEXT, P/P, PREV function indicating LEDs in Bluetooth and MP3 playback, respectively. PA0, PA9 corresponds to the AUX left and right signal input, PA10 is the bluetooth play or MP3 play detection function that can be interrupted when the AUX signal is inserted. The DARP & DARN and DALP & DALN form differential outputs to U204 for differential amplification to other audio inputs (except OTG audio signals) for adder to LIVE signal output.

Specifically, as shown in fig. 5, the chip adopted by the OTG data exchange module is AC6956F, the DARP pin of the chip AC6956F corresponds to amp_lin and outputs to the audio tooth pitch detection module, the DARN pin of the chip AC6956F corresponds to amp_rin and outputs to the audio tooth pitch detection module, and the audio tooth pitch detection module amplifies the power of the input signal and outputs the amplified signal; the DARP/DARN pins and DALP/DALN pins of the chip AC6956F are defined as differential outputs, wherein the DARP/DARN pins respectively correspond to HR_AMP_LIN and HE_AMP_RI N output to the earphone output and the power amplifier output; the output of the audio tooth sound detection module is connected with the PA10 pin of the chip AC 6956F.

The specific OTG data exchange module further comprises a LIVE unit, the LIVE unit is connected with the power amplifier input/output module, and DALP/DALN pins respectively correspond to OTG_RO and OTG_LO and are used as USB RECORDI NG L IVE.

Specifically, as shown in fig. 6, the audio tooth sound detection module is connected to the power amplifier input/output module through hr_amp_lin and hr_amp_rin, and receives a mixed audio signal, and the audio tooth sound detection module includes an adder U301B, U, 303A, U, B, U, 202 and A, U B, and the adder U301B, U, 303, A, U, B, U, 202 and A, U B are sequentially connected, and further includes an RC network disposed on the adder U301B, U, 303, A, U, 106, B, U, A, U B.

Specifically, the Q value of the RC network of the audio tooth sound detection module is 12db, and the bandwidth is 2582 Hz-5910 Hz.

IN this embodiment, it can be seen that the mixed audio signal sent to hr_amp_lin & hr_amp_ri N is amplified or followed by an adder and then sent to an active BYPASS circuit formed by U303A and U106B, i.e., an audio tooth pitch detection module. The upper and lower limit frequencies of the BYPASS circuit are composed of RC networks such as C371/R371/C373/R373 and C372/R372/C374/R374, and the Q value is 12db. The BYPASS FREQUENCY bandwidth is 2582 Hz-5910 Hz. And this frequency is the band range where the tooth tones are most likely to cause sharp and harsher. For frequencies above 6KHz, we separate and compress in an electronic frequency division mode, so that the gain is reduced to reasonably amplify and perfect tone and bandwidth. After processing frequencies above 6KHz, tooth audio segments which are easy to generate high-frequency harshness are selected through BYPASS, and the frequencies of the tooth audio segments 2582Hz to 5910Hz are selected through simulation. The internal algorithm divides the audio frequency of the audio frequency tooth audio frequency band into two paths for processing, and the processing method firstly digitizes the analog signals. The JL7016C sampling rate is 8kHz/11.025kHz/16kHz/22.05kHz/24kHz/32kHz/44.1kHz/48kHz for the audio ADC. The digitized audio signal is divided into two paths A & B. The frequency, phase and amplitude of one path of audio frequency are kept unchanged, and are called A for short. The other path is taken out with unchanged frequency and amplitude which change along with the amplitude change of the input signal, and the phase is 180 degrees from the phase, which is abbreviated as B. And processing the B path signal by an algorithm. The principle of the algorithm B: the frequency is unchanged, the amplitude is changed along with the amplitude change of the input signal, and the amplitude is inverted 180 degrees through the remainder obtained by subtracting more than 0db (1V) through the algorithm. This is a+ (-B) =0db (1V). And the output tooth audio segments 2582Hz to 5910Hz 0db (1V) remain constant. That is, the frequency is unchanged after phase inversion, the phase is inverted by 180 degrees, and the amplitude is randomly changed so that the output frequency of the output tooth audio segment output 0db (1V) is kept constant. Namely, the phase offset is carried out on the digital processing audio B of the inverted tooth audio frequency range 2582 Hz-5910 Hz audio frequency and the tooth audio frequency range 2582 Hz-5910 Hz audio frequency of the original unprocessed tooth audio frequency range A. But the offset bandwidth and the frequency width do not exceed the bandwidth of 2582 Hz-5910 Hz and the frequency width of 0db of the tooth audio frequency band, so that the audio frequency reduction degree is kept to be the highest.

The BYPASS circuit in the circuit selects the bandwidth frequency which is determined to need to be limited and sends the bandwidth frequency to the U202A for amplification, the bandwidth frequency is buffered by the R423 and then sent to the U202B 5pin, the bandwidth frequency is compared with the R232 and R231 standard voltage division 6pin, the comparison standard voltage is 1V, the comparison input audio voltage 0db signal is 1V and is input into the U502 DSP AC6956F PA10, namely the PA1025pin is the BYPASS tooth audio frequency band detection port. When the audio amplitude of the BYPASS tooth audio frequency band to be controlled is smaller than 1V, the output voltage of the comparator U202B is not overturned, and the comparator 7pin outputs a low level. I.e. the U502 DSP AC6956F PA1025pin does not recognize a high level, the internal algorithm does not process, since the tooth audio segment output at this time is not high, and no harshness and microphone and guitar howling are generated. When the BYPASS tooth audio frequency band is higher than 1V 0db, the output voltage of the comparator is turned over to output high level, and the output voltage is sent to the internal core of the U502 DSP AC6956F for arithmetic processing through the PA1025 pin. The BYPASS tooth audio segment is made no higher than 1v 0db audio output by audio algorithm processing. The output signal DARP & DARN is output to the electronic frequency division circuit corresponding to the AMP_LIN & AMP_RIN, and is output by power amplification for the TI TPA3116D2 CLASS-D CLASS amplifier through the power amplifier. Wherein the original output of U502 DSP AC6956F is defined as DARP/DARN and DALP/DALN as differential output, and we change the DARP/DARN definition into HR_AMP_LIN and HE_AMP_RIN output to earphone output and power amplifier output through an underlying algorithm. The DALP/DALN definition was modified to otg_ro & otg_lo for USB RECORDING LIVE.

As shown IN fig. 7, the amp_out is a MIX signal interface connected IN series with amp_in of another active speaker. The model can be connected IN series with the model JPA866 without the upper limit IN theory, and can also be connected IN series with other models with AMP_IN function.

In addition, a MICROPHONE inputs CHANNEL, and control functions such as GAIN, BASS, TREBLE, DELAY, REVERB are provided, wherein GAIN, BASS, TREBLE is controlled by analog control technology, and DELAY and REVERB are controlled by DSP algorithm. Wherein GAIN of GAIN is 0-MAX. BASS, TREBLE is +/-12db control. DELAY, REVERB DELAY and reverberation effects are appropriately adjusted as needed.

GUITAR inputs CHANNELs, provided with control functions GAIN, BASS, TREBLE, DELAY, REVERB, wherein GAIN, BASS, TREBLE is controlled by analog control technology, DELAY and REVERB are controlled by DSP algorithm. Wherein GAIN of GAIN is 0-MAX. BASS, TREBLE is +/-12db control. DELAY, REVERB DELAY and reverberation effects are appropriately adjusted as needed.

The MUSIC audio input interface includes aux_in and BLUETOOTH inputs. The two input modes are the STEREO mode, i.e. the STEREO mode, with a separate VOLUME control, i.e. a separate VOLUME level control button.

Recording channels are OTG digital inputs and PORT analog inputs. The two paths of input audio signals are STEREO signals and also have a recording function, wherein OTG is a digital STEREO recording signal, and PORT is a MONO recording signal. Such recordings are also known and used as LIVE broadcast functions. The signal recording has a recording volume control.

The AMP_IN channel is a MONO input signal, namely a MONO input signal, and has the main function of being used as a MIX audio input interface when two active sound boxes are connected IN series, and can also be used for inputting other machine models with MIX output functions IN series.

The power amplifier is a TI TPA3116D2 CLASS-D CLASS amplifier, the output power is 100W, in the loudspeaker box, the high-frequency audio amplification signal is output when the output of high-frequency sound is OUT_LN and OUT_LP is in a bridging mode, and the output port is connected with two 2.75 inch 15W/8Ω high-frequency horns. The bass output is OUT_RN and OUT_RP is the bridging mode, the low-frequency audio amplification signal is output, and the output port is connected with 1 tweeter with the size of 8 inches and 50W/4Ω.

Amp_out is a serial output MIX signal interface with another JPA866 model amp_in. The model can be connected in series with the model JPA866 without the upper limit in theory, and can also be connected in series with other models with the function of AMP I N.

EARPHONE output interface. The main function is a monitoring function, and the interface is a STEREO interface. In order to avoid the audio signal of the earphone from injuring the ears of a person, the output VOLUME VOLUME function of the earphone is specially set.

Dc_out is the charging interface. The charging output parameter was 5V/1A. The system can be an i PHONE mobile PHONE, an i PAD tablet, an ANDROID mobile PHONE and the like which are provided with a TYPE_C charging interface and an electronic product charging interface of an IOS operating system.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims (10)

1. The utility model provides an active audio amplifier circuit architecture that can eliminate high frequency tooth sound, its characterized in that includes microphone and guitar input preceding processing module, delay reverberation module, bluetooth and supplementary audio input module, mixed audio processing module, PORT analog recording and play exchange and OTG data exchange module, audio frequency tooth sound detection module, power amplifier input output module, wherein: the microphone and guitar input pre-stage processing module, the delay reverberation module, the mixed audio processing module, the PORT analog recording and playing exchange and OTG data exchange module, the audio tooth sound detection module and the power amplifier input and output module are connected in sequence;

the microphone and guitar input pre-stage processing module comprises a microphone input processing unit and a guitar input processing unit, and the microphone input processing unit and the guitar input processing unit are connected with the delayed reverberation module.

2. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 1, wherein: the microphone input processing unit comprises a TRS input port and an XLR differential input port, the TRS input port and the XLR differential input port are respectively connected with the adder U111A unit through an amplifier circuit and then are connected with the microphone frequency band equalizing unit after being amplified, the microphone equalizing unit is connected with the capacitor C540, the capacitor C540 is connected with the delay reverberation module, and the TRS input port and the XLR differential input port are composite ports;

the guitar input processing unit comprises a TRS input port, the TRS input port is connected with the adder U121A unit through an amplifier circuit and is connected with the guitar frequency band balancing unit after being amplified, the guitar frequency band balancing unit is connected with the capacitor C541, and the capacitor C541 is connected with the delay reverberation module.

3. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 2, wherein: the input sensitivity of TRS in the TRS & XLR composite input port of the microphone input processing unit is-40 db, the input sensitivity of the XLR differential input port is-46 db, and the input sensitivity of the TRS input port of the guitar input processing unit is-12 db.

4. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 2, wherein: the microphone band equalization unit includes three series connected varistors VR112-VR114 and the guitar band equalization unit includes three parallel connected varistors VR122-VR124.

5. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 2, wherein: the chip adopted by the delay reverberation module is JL7016C, a capacitor C540 is connected with a PA9 pin of the chip JL7016C, a capacitor C541 is connected with a PA0 pin of the chip AC7016C, a PB1 pin of the chip JL7016C is a microphone delay reverberation effect AD port, and a PB3 pin of the chip JL7016C is a guitar delay reverberation effect AD port.

6. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 5, wherein: the Bluetooth and auxiliary audio input module comprises a USB_MP3 playing port and an AUX input port, wherein the USB_MP3 playing port and the AUX input port are connected with the chip AC6956F, pins PB9-PB11 of the chip AC6956F respectively correspond to NEXT and P/P, PREV of Bluetooth and MP3 playing, pins PC3-PC5 of the chip AC6956F respectively correspond to PREV function indication LEDs, P/P and NEXT in Bluetooth and MP3 playing, pins PA0 and PA9 of the chip AC6956F respectively correspond to left and right signal input of the AUX input port, PA10 of the chip AC6956F can interrupt Bluetooth playing or MP3 playing detection ports when AUX signals are inserted, DARP, DARN and DALN of the chip AC6956F form differential output to U204 for differential amplification output.

7. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 6, wherein: the chip adopted by the OTG data exchange module is AC6956F, the DARP pin of the chip AC6956F corresponds to AMP_LIN and outputs to the audio tooth sound detection module, the DARP pin of the chip AC6956F corresponds to AMP_RIN and outputs to the audio tooth sound detection module, and the audio tooth sound detection module amplifies the power of the input signal and outputs the amplified signal;

the DARP/DARN pins and the DALP/DALN pins of the chip AC6956F are defined as differential outputs, wherein the DARP/DARN pins respectively correspond to HR_AMP_LIN and HE_AMP_RIN and are output to a headset output and a power amplifier output; the output of the audio tooth sound detection module is connected with the PA10 pin of the chip AC 6956F.

8. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 7, wherein: the OTG data exchange module further comprises a LIVE unit, the LIVE unit is connected with the power amplifier input/output module, and the DALP/DALN pins respectively correspond to OTG_RO and OTG_LO and are used as USB RECORDING LIVE.

9. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 8, wherein: the audio tooth sound detection module is connected with the power amplifier input and output module through HR_AMP_LIN and HR_AMP_RIN and receives a mixed audio signal, the audio tooth sound detection module comprises an adder U301B, U303A, U106B, U202A, U B, the adder U301B, U303A, U106B, U202A, U B is sequentially connected, and the audio tooth sound detection module further comprises an RC network arranged on the adder U301B, U303A, U106B, U202A, U B.

10. The source speaker circuit architecture for eliminating high frequency tooth noise of claim 9, wherein: the Q value of the RC network of the audio tooth sound detection module is +/-12db, and the bandwidth is 2582 Hz-5910 Hz.