CN104853290B - A kind of audio signal processing circuit and electronic equipment with the circuit - Google Patents
A kind of audio signal processing circuit and electronic equipment with the circuit Download PDFInfo
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Abstract
The invention discloses a kind of audio signal processing circuit and electronic equipments with the circuit, wherein the audio signal processing circuit includes：Input volume processing unit, channel switch unit, output volume adjusting unit；The input volume processing unit receives input audio signal, and is the signal volume within the scope of systemic presupposition by the processing of the volume of the input audio signal, and treated that audio signal is sent to the channel switch unit by described；The channel switch unit carries out selection processing according to the channel of the audio signal to audio signal, and will selection treated audio signal transmission to the output volume adjusting unit；The audio signal received is carried out output volume adjusting, and the audio signal after the adjusting is exported by the output volume adjusting unit.The volume processing of input audio signal is made the volume that audio frequency apparatus exports match with trumpet end sound by the present invention by inputting volume processing unit for the signal volume within the scope of systemic presupposition, and reduces the distortion probabilities of audio output.
Description
Technical Field
The present invention relates to the field of power electronics technologies, and in particular, to an audio signal processing circuit and an electronic device having the same.
Background
In the existing acoustic products, the audio device usually receives different input audio signals, and transmits the received audio signals through audio signal processing. However, in the process of designing the audio signal processing device, the inventor finds that the volume range of the input audio signal of the existing audio device is different from that of the audio signal input from the outside, so that the sound heard at the speaker end is different from the volume output by the audio device, and even the sound heard at the speaker end is distorted because the audio signal input from the outside is too large or too small; for example: when the external input audio signal is too large and exceeds the maximum output power of the speaker end, the distortion of the output audio signal is caused.
Disclosure of Invention
In view of the above problems, the present invention is proposed to provide a solution to overcome or at least partially solve the above problems, and the technical solution of the present invention is realized by:
in one aspect, the present invention provides an audio signal processing circuit, including: the system comprises an input volume processing unit, a channel switching unit and an output volume adjusting unit;
the input volume processing unit receives an input audio signal, processes the volume of the input audio signal into a volume signal within a preset range of a system, and sends the processed audio signal to the channel switching unit;
the channel switching unit is used for carrying out selection processing on the audio signal according to the channel of the audio signal and transmitting the audio signal after the selection processing to the output volume adjusting unit;
and the output volume adjusting unit is used for adjusting the output volume of the received audio signal and outputting the adjusted audio signal.
Preferably, the input volume processing unit includes: an input volume judging unit and an input volume adjusting unit;
the input volume judging unit receives the input audio signal and a system preset volume threshold; comparing whether the input audio signal exceeds the preset volume threshold value of the system; if the input audio signal exceeds the preset system volume threshold, sending the input audio signal to the input volume adjusting unit for volume adjustment until the input audio signal is adjusted to be within the preset system range;
and the input volume adjusting unit is used for sending the adjusted audio signal to the channel switching unit.
Preferably, the input volume judging unit includes: a first judgment subunit and a second judgment subunit;
the first judging subunit is configured to judge whether a left channel input audio signal exceeds the preset volume threshold of the system;
and the second judgment subunit is used for judging whether the right channel input audio signal exceeds the preset volume threshold of the system.
Preferably, the first judging subunit includes: a first comparator U1-A;
pin 1 of the first comparator U1-A is connected with a left channel signal adjusting signal end pin 2 of the system controller and is connected with a volume threshold end of the system controller, and pin 3 is connected with one end of the input volume adjusting unit;
the second judgment subunit includes: a second comparator U1-B;
pin 7 of the second comparator U1-B is connected with pin 6 of a right channel signal adjusting signal end of the system controller, and pin 5 is connected with one end of the input volume adjusting unit.
Preferably, the input volume adjusting unit includes: a first input volume adjusting subunit and a second input volume adjusting subunit;
the first input volume adjusting subunit is configured to, if the left channel input audio signal exceeds the system preset volume threshold, send the left channel input audio signal to the input volume adjusting unit, and perform volume adjustment until the input audio signal is adjusted to a volume signal within the system preset range;
and the second input volume adjusting subunit is configured to send the right channel input audio signal to the input volume adjusting unit to perform volume adjustment until the input audio signal is adjusted to a volume signal within the preset range of the system if the right channel input audio signal exceeds the preset volume threshold of the system.
Preferably, the first and second electrodes are formed of a metal,
the circuit further includes sixty-th and fifty-ninth capacitors C60 and C59; the sixteenth capacitor C60 and the fifty-ninth capacitor C59 are filter capacitors;
the first input volume adjusting subunit includes: a fifth switching tube Q5, a second resistor R2, a first input volume adjusting chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10;
one end of the sixty-second capacitor C60 is connected to pin 3 of the first comparator U1-a, and the other end is connected to one end of the second resistor R2 and pin 1 of the fifth switch Q5, respectively;
the other end of the second resistor R2 is grounded;
pins 2 and 3 of the fifth switch tube Q5 are connected with the input volume adjusting chip U2;
pin 1 of the first input volume adjusting chip U2 is connected to a power supply terminal VDD, pin 2 is connected to one end of the tenth resistor R10, pin 3 is grounded, pin 4 is connected to an end of a CONTROL signal L _ GAIN _ E _ CONTROL of the system controller, pin 5 is connected to one end of the ninth resistor R9, pin 6 is grounded, pin 7 is connected to one end of the eighth resistor R8, pin 8 is connected to a CONTROL signal L _ GAIN _ C _ CONTROL of the system controller, pin 9 is connected to a system preset volume threshold terminal VDD _ AUDIO of the system controller, and pin 10 is connected to one end of the seventh resistor R7;
the other end of the tenth resistor R10 is connected to pin 2 of the fifth switch Q5, and the other end of the ninth resistor R9, respectively;
the other end of the eighth resistor R8 is connected to pin 3 of the fifth switch Q5, respectively, and the channel switching unit;
the other end of the seventh resistor R7 is connected to pin 3 of the fifth switch Q5, respectively, and the channel switching unit;
the second input volume adjusting subunit: a second switch tube Q2, a first resistor R1, a second input volume adjusting chip U3, a third resistor R3, an eleventh resistor R11, a thirteenth resistor R13, and a twelfth resistor R12;
one end of the fifty-ninth capacitor C59 is connected to the pin 5 of the second comparator U1-B, and the other end is connected to one end of the first resistor R1 and the pin 1 of the second switch tube Q2, respectively;
the other end of the first resistor R1 is grounded;
pins 2 and 3 of the second switch tube Q2 are connected with the input volume adjusting chip U3;
pin 1 of the second input volume adjusting chip U3 is connected to a power supply terminal VDD, pin 2 is connected to one end of the thirteenth resistor R13, pin 3 is grounded, pin 4 is connected to an end of a CONTROL signal R _ GAIN _ E _ CONTROL of the system controller, pin 5 is connected to one end of the twelfth resistor R12, pin 6 is grounded, pin 7 is connected to one end of the eleventh resistor R11, pin 8 is connected to a CONTROL signal R _ GAIN _ C _ CONTROL of the system controller, pin 9 is connected to a system preset volume threshold terminal VDD _ AUDIO of the system controller, and pin 10 is connected to one end of the third resistor R3;
the other end of the thirteenth resistor R13 is connected to pin 2 of the second switch Q2, and the other end of the twelfth resistor R12, respectively;
the other end of the eleventh resistor R11 is connected to pin 3 of the second switch Q2, respectively, and the channel switching unit;
the other end of the third resistor R3 is connected to pin 3 of the second switch Q2, respectively, and the channel switching unit.
Preferably, the channel switching unit includes: a first switching leg and a second switching leg;
the first switch branch circuit is used for selectively switching a left channel audio signal of an externally input audio signal and a left channel audio signal in a system and transmitting the audio signal selectively output to the output volume adjusting unit;
the second switch branch is used for selectively switching a right channel audio signal of an externally input audio signal and a right channel audio signal in the system, and transmitting the audio signal selectively output to the output volume adjusting unit.
Preferably, the output volume adjusting unit includes: a first output volume adjusting unit and a second output volume adjusting unit;
the first output volume adjusting unit is configured to adjust the output volume of the received audio signal transmitted by the first switch branch, and output the adjusted audio signal;
and the second output volume adjusting unit is used for adjusting the output volume of the received audio signal transmitted by the second switch branch and outputting the adjusted audio signal.
Preferably, the output volume adjusting unit includes: a first capacitor C1, a second capacitor C2 and a volume adjusting chip RT 1;
the RT1 chip has pin 1 connected to ground, pin 2 connected to the output device corresponding to the left channel, pin 3 connected to one end of the first capacitor C1, pin 4 connected to one end of the second capacitor C2, and pin 5 connected to the output device corresponding to the right channel;
the other end of the first capacitor C1 is connected with the first switch branch;
the other end of the second capacitor C2 is connected to the second switch branch.
The present invention provides an electronic device, including: an audio signal processing circuit as claimed in any preceding claim.
According to the technical scheme, the volume of the input audio signal is processed into the volume signal within the preset range of the system through the input volume processing unit, so that the volume output by the audio equipment is matched with the sound at the loudspeaker end, and the distortion probability of audio output is reduced.
Drawings
Fig. 1 is a schematic diagram of an audio signal processing circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an audio signal processing circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating an audio signal processing circuit according to an embodiment of the present invention; the audio signal processing circuit includes: an input volume processing unit 101, a channel switching unit 102, an output volume adjusting unit 103;
the input volume processing unit receives an input audio signal, processes the volume of the input audio signal into a volume signal within a preset range of a system, and sends the processed audio signal to the channel switching unit;
the channel switching unit is used for carrying out selection processing on the audio signal according to the channel of the audio signal and transmitting the audio signal after the selection processing to the output volume adjusting unit;
and the output volume adjusting unit is used for adjusting the output volume of the received audio signal and outputting the adjusted audio signal.
It should be noted that the input volume processing unit includes: an input volume judging unit and an input volume adjusting unit;
the input volume judging unit receives the input audio signal and a system preset volume threshold; comparing whether the input audio signal exceeds the preset volume threshold value of the system; if the input audio signal exceeds the preset system volume threshold, sending the input audio signal to the input volume adjusting unit for volume adjustment until the input audio signal is adjusted to be within the preset system range;
and the input volume adjusting unit is used for sending the adjusted audio signal to the channel switching unit.
Based on the above embodiment, when the input audio signal includes: when the audio signal is inputted to the left channel and the audio signal is inputted to the right channel, as shown in fig. 2, the audio signal processing circuit diagram provided by the embodiment of the present invention is shown; the circuit includes: the device comprises an input volume judging unit, an input volume adjusting unit, a channel switching unit and an output volume adjusting unit; wherein,
the input volume judging unit includes: a first judgment subunit and a second judgment subunit; the first judging subunit is configured to judge whether a left channel input audio signal exceeds the preset volume threshold of the system; and the second judgment subunit is used for judging whether the right channel input audio signal exceeds the preset volume threshold of the system.
The input volume adjusting unit includes: a first input volume adjusting subunit and a second input volume adjusting subunit; the first input volume adjusting subunit is configured to, if the left channel input audio signal exceeds the system preset volume threshold, send the left channel input audio signal to the input volume adjusting unit, and perform volume adjustment until the input audio signal is adjusted to a volume signal within the system preset range; and the second input volume adjusting subunit is configured to send the right channel input audio signal to the input volume adjusting unit to perform volume adjustment until the input audio signal is adjusted to a volume signal within the preset range of the system if the right channel input audio signal exceeds the preset volume threshold of the system.
The switching channel switching unit includes: a first switching leg and a second switching leg; the first switch branch circuit is used for selectively switching a left channel audio signal of an externally input audio signal and a left channel audio signal in a system and transmitting the audio signal selectively output to the output volume adjusting unit; the second switch branch is used for selectively switching a right channel audio signal of an externally input audio signal and a right channel audio signal in the system, and transmitting the audio signal selectively output to the output volume adjusting unit.
The output volume adjusting unit includes: a first output volume adjusting unit and a second output volume adjusting unit; the first output volume adjusting unit is configured to adjust the output volume of the received audio signal transmitted by the first switch branch, and output the adjusted audio signal; and the second output volume adjusting unit is used for adjusting the output volume of the received audio signal transmitted by the second switch branch and outputting the adjusted audio signal.
The specific implementation circuit based on the functional modules is as follows:
the first judging subunit includes: a first comparator U1-A; the second judgment subunit includes: a second comparator U1-B; the first input volume adjusting subunit includes: a fifth switching tube Q5, a second resistor R2, a first input volume adjusting chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10; the second input volume adjusting subunit includes: a second switch tube Q2, a first resistor R1, a second input volume adjusting chip U3, a third resistor R3, an eleventh resistor R11, a thirteenth resistor R13, and a twelfth resistor R12; the output volume adjusting unit includes: a first capacitor C1, a second capacitor C2 and a volume adjusting chip RT 1; the circuit further includes sixty-th and fifty-ninth capacitors C60 and C59; the sixteenth capacitor C60 and the fifty-ninth capacitor C59 are filter capacitors; and the sixteenth capacitor C60 and the fifty-ninth capacitor C59 are isolated from direct current and alternating current, so that non-audio interference signals are filtered.
Pin 1 of the first comparator U1-A is connected with a left channel signal adjusting signal end of a system controller, namely the first comparator U1-A sends a comparison result to the system controller through pin 1, and the system controller sends a corresponding control command signal according to the comparison result; pin 2 of the first comparator U1-A is connected with a volume threshold end of a system controller, and pin 3 is connected with one end of the sixty capacitor C60;
the other end of the sixty-fourth capacitor C60 is respectively connected to one end of the second resistor R2 and pin 1 of the fifth switch Q5;
the other end of the second resistor R2 is grounded;
pins 2 and 3 of the fifth switch tube Q5 are connected with the input volume adjusting chip U2;
pin 7 of the second comparator U1-B is connected with a right channel signal adjusting signal end of the system controller, namely the second comparator U1-B sends the comparison result to the system controller through pin 7, and the system controller sends out a corresponding control command signal according to the comparison result; pin 6 of the second comparator U1-B is connected with a volume threshold end of a system controller, and pin 5 is connected with one end of the fifty-ninth capacitor C59;
the other end of the fifty-ninth capacitor C59 is respectively connected to one end of the first resistor R1 and pin 1 of the second switch Q2;
the other end of the first resistor R1 is grounded;
pins 2 and 3 of the second switch tube Q2 are connected to the input volume adjusting chip U3.
Pin 1 of the first input volume adjusting chip U2 is connected to a power supply terminal VDD, pin 2 is connected to one end of the tenth resistor R10, pin 3 is grounded, pin 4 is connected to an end of a CONTROL signal L _ GAIN _ E _ CONTROL of the system controller, pin 5 is connected to one end of the ninth resistor R9, pin 6 is grounded, pin 7 is connected to one end of the eighth resistor R8, pin 8 is connected to a CONTROL signal L _ GAIN _ C _ CONTROL of the system controller, pin 9 is connected to a system preset volume threshold terminal VDD _ AUDIO of the system controller, and pin 10 is connected to one end of the seventh resistor R7;
the other end of the tenth resistor R10 is connected to pin 2 of the fifth switch Q5, and the other end of the ninth resistor R9, respectively;
the other end of the eighth resistor R8 is connected to pin 3 of the fifth switch Q5, respectively, and the channel switching unit;
the other end of the seventh resistor R7 is connected to pin 3 of the fifth switch Q5, respectively, and the channel switching unit;
pin 1 of the second input volume adjusting chip U3 is connected to a power supply terminal VDD, pin 2 is connected to one end of the thirteenth resistor R13, pin 3 is grounded, pin 4 is connected to an end of a CONTROL signal R _ GAIN _ E _ CONTROL of the system controller, pin 5 is connected to one end of the twelfth resistor R12, pin 6 is grounded, pin 7 is connected to one end of the eleventh resistor R11, pin 8 is connected to a CONTROL signal R _ GAIN _ C _ CONTROL of the system controller, pin 9 is connected to a system preset volume threshold terminal VDD _ AUDIO of the system controller, and pin 10 is connected to one end of the third resistor R3;
the other end of the thirteenth resistor R13 is connected to pin 2 of the second switch Q2, and the other end of the twelfth resistor R12, respectively;
the other end of the eleventh resistor R11 is connected to pin 3 of the second switch Q2, respectively, and the channel switching unit;
the other end of the third resistor R3 is connected to pin 3 of the second switch Q2, respectively, and the channel switching unit.
The channel switching unit includes: a first switching leg and a second switching leg; the first switch branch and the second switch branch can adopt an integrated chip U4 to realize the function of the channel switching unit; the integrated chip U4 pin 1, pin 10, pin 9, pin 8 and pin 7 of the channel switching unit realize the first switch branch function; the integrated chip U4 pin 2, pin 3, pin 4 pin 5 and pin 6 of the channel switching unit realize the function of the second switch branch circuit; the specific circuit connection is as follows: the integrated chip U4 pin 1 of the channel switching unit is connected with a power supply VDD, the pin 10 is respectively connected with one end of the eighth resistor R8, one end of a seventh resistor R7 and the pin 3 of the fifth switch tube Q5; pin 9 of an integrated chip U4 of the CHANNEL switching unit is connected to one end of the first capacitor C1, pin 8 of an integrated chip U4 of the CHANNEL switching unit is connected to a control signal CHANNEL _ SELECT of the system controller, and pin 7 of an integrated chip U4 of the CHANNEL switching unit is connected to a control signal INTERNAL _ AUDIO _ L of the system controller;
the integrated chip U4 pin 2 of the channel switching unit is respectively connected with one end of the eleventh resistor R11, one end of the third resistor R3 and the Q2 pin 3 of the second switch tube; pin 3 of the integrated chip U4 of the CHANNEL switching unit is connected to one end of the second capacitor C2, and pin 4 of the integrated chip U4 of the CHANNEL switching unit is connected to a control signal CHANNEL _ SELECT of the system controller; pin 5 of an integrated chip U4 of the channel switching unit is connected with a control signal INTERNAL _ AUDIO _ R of the system controller; pin 6 of the integrated chip U4 of the channel switching unit is connected to ground.
The RT1 pin 1 of the volume adjusting chip is grounded, pin 2 is connected to the output device SPK _ L corresponding to the left channel, pin 3 is connected to one end of the first capacitor C1, pin 4 is connected to one end of the second capacitor C2, and pin 5 is connected to the output device SPK _ R corresponding to the right channel.
It should be noted that the first capacitor C1 and the second capacitor C2 function to block ac current, and only allow signals in the audio frequency range to reach the two speaker ends through the two capacitors.
Based on the above circuit, the following explains the working principle of the present invention in detail by taking the example that the volume of the external input audio signal exceeds the preset volume threshold of the system;
when the AUDIO signal processing circuit is in normal use, if no external AUDIO plug is inserted, the system defaults to use an INTERNAL AUDIO signal, the INTERNAL AUDIO signal is input to the output volume adjusting unit Volum _ adjust from the signal pins INTERNAL _ AUDIO _ L/INTERNAL _ AUDIO _ R shown in the attached figure 2, and then the AUDIO signal is sent to the horn ends SPK _ L and SPK _ R by the output volume adjusting unit Volum _ adjust.
When no external audio plug is inserted, the pin LINE _ IN _ DETECT is high as shown IN fig. 2, and when an external audio plug is inserted, the pin LINE _ IN _ DETECT becomes a non-high state, that is, the pin LINE _ IN _ DETECT is connected to the system controller, and as long as the signal is non-high, it is considered that an audio plug is inserted. Once an external audio plug is plugged IN, the plugging signal LINE _ IN _ DETECT is detected, and then the system controller outputs a control signal CHANNEL _ SELECT to switch the signal output to the horn terminal from the internal input to the external input.
When an external audio SIGNAL is input, taking a left channel audio input as an example, when the amplitude of an input audio SIGNAL exceeds the maximum value of an audio voltage which can be output internally, specifically, a comparator U1-A is adopted to compare a system preset volume threshold voltage with the input audio SIGNAL voltage, and if the input audio SIGNAL voltage exceeds the system preset volume threshold voltage, a comparison SIGNAL is sent to an ADJUSTABLE _ SIGNAL _ L pin of a system controller through a pin 1 of a comparator U1-A; the system considers that the amplitude of the input audio signal exceeds the maximum value of the internally set outputable audio voltage, the system controller sends out control signals L _ GAIN _ C _ CONTRL and L _ GAIN _ E _ CONTRL, the input signal is reduced by controlling the paths of a seventh resistor R7 connected with the collector of a triode integrated in the first input volume adjusting chip U2, an eighth resistor R8 connected with the emitter of a ninth resistor R9 and a tenth resistor R10, the reduction factor is the AC amplification factor AV RC/RE of the three-stage tube, the system controller controls the L _ GAIN _ C _ CONTRL and the L _ GAIN _ E _ CONTRL _ C _ CONTRL, the AV is R7/R9, the AV is R7/R10, the AV is R8/R9, the AV is R8/R10, and the resistance value of the R8/R9638/R9 can be selected according to the actual requirement, and sequentially realizing different gains, and further realizing the adjustment of gradually reducing the input AUDIO signal under the control of the system controller until the requirement that the voltage of the AUDIO signal input by the LINE _ IN is not more than VDD _ AUDIO is met. Then, the signal passes through the channel corresponding to the channel switching unit U4, further passes through the output volume adjusting unit volume _ adjust, and then is output to the terminal SPK _ L of the microphone. In this way, an excessively large external input audio signal input from the audio interface to the system is subjected to reduction processing; therefore, the aim that the maximum volume of the output volume of different audio signals input from the outside after being processed does not exceed the maximum volume of the audio signal output by the internal audio signal when different external audio signals are input can be achieved, and the phenomenon of distortion caused by overlarge audio signals input from the outside is eliminated.
The processing of the input audio signal for the right channel is identical to the processing for the left channel, and will not be described herein.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention; the electronic device includes: an audio signal processing circuit as claimed in any preceding claim.
It should be noted that the audio signal processing circuit provided in the embodiment of the present invention may further process a smaller audio signal according to actual needs, and process a smaller external input audio signal within a preset range of a system, and the specific implementation circuit and principle are the same, and are not described herein again.
According to the technical scheme, the volume of the input audio signal is processed into the volume signal within the preset range of the system through the input volume processing unit, so that the volume output by the audio equipment is matched with the sound at the loudspeaker end, and the distortion probability of audio output is reduced.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. An audio signal processing circuit, comprising: the system comprises an input volume processing unit, a channel switching unit and an output volume adjusting unit;
the input volume processing unit receives an input audio signal, processes the volume of the input audio signal into a volume signal within a preset range of a system, and sends the processed audio signal to the channel switching unit;
the channel switching unit is used for carrying out selection processing on the audio signal according to the channel of the audio signal and transmitting the audio signal after the selection processing to the output volume adjusting unit;
the output volume adjusting unit is used for adjusting the output volume of the received audio signal and outputting the adjusted audio signal;
the input volume processing unit includes: an input volume adjusting unit;
the input volume adjusting unit includes: a first input volume adjusting subunit;
the first input volume adjusting subunit includes: a fifth switching tube Q5, a second resistor R2, a first input volume adjusting chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10;
one end of the second resistor R2 is grounded, and the other end of the second resistor R2 is connected with pin 1 of the fifth switch tube Q5;
pins 2 and 3 of the fifth switching tube Q5 are connected with the first input volume adjusting chip U2;
pin 1 of the first input volume adjusting chip U2 is connected to a power supply terminal VDD, pin 2 is connected to one end of the tenth resistor R10, pin 3 is grounded, pin 4 is connected to a CONTROL signal L _ GAIN _ E _ CONTROL end of a system controller, pin 5 is connected to one end of the ninth resistor R9, pin 6 is grounded, pin 7 is connected to one end of the eighth resistor R8, pin 8 is connected to a CONTROL signal L _ GAIN _ C _ CONTROL end of the system controller, pin 9 is connected to a system preset volume threshold terminal VDD _ AUDIO of the system controller, and pin 10 is connected to one end of the seventh resistor R7;
the other end of the tenth resistor R10 is connected to pin 2 of the fifth switch Q5, and the other end of the ninth resistor R9, respectively;
the other end of the eighth resistor R8 is connected to pin 3 of the fifth switch Q5, respectively, and the channel switching unit;
the other end of the seventh resistor R7 is connected to pin 3 of the fifth switch Q5, respectively, and the channel switching unit.
2. The audio signal processing circuit of claim 1, wherein the input volume processing unit further comprises: an input volume judging unit;
the input volume judging unit receives the input audio signal and a system preset volume threshold; comparing whether the input audio signal exceeds the preset volume threshold value of the system; if the input audio signal exceeds the preset system volume threshold, sending the input audio signal to the input volume adjusting unit for volume adjustment until the input audio signal is adjusted to be within the preset system range;
and the input volume adjusting unit is used for sending the adjusted audio signal to the channel switching unit.
3. The audio signal processing circuit according to claim 2, wherein the input volume determination unit includes: a first judgment subunit and a second judgment subunit;
the first judging subunit is configured to judge whether a left channel input audio signal exceeds the preset volume threshold of the system;
and the second judgment subunit is used for judging whether the right channel input audio signal exceeds the preset volume threshold of the system.
4. The audio signal processing circuit of claim 3,
the first judging subunit includes: a first comparator U1-A;
pin 1 of the first comparator U1-A is connected with a left channel signal adjusting signal end of the system controller, pin 2 is connected with a volume threshold end of the system controller, and pin 3 is connected with one end of the input volume adjusting unit;
the second judgment subunit includes: a second comparator U1-B;
pin 7 of the second comparator U1-B is connected with a right channel signal adjusting signal end of the system controller, pin 6 is connected with a volume threshold end of the system controller, and pin 5 is connected with one end of the input volume adjusting unit.
5. The audio signal processing circuit of claim 4, wherein the input volume adjustment unit further comprises: a second input volume adjusting subunit;
the first input volume adjusting subunit is configured to, if the left channel input audio signal exceeds the system preset volume threshold, send the left channel input audio signal to the input volume adjusting unit, and perform volume adjustment until the input audio signal is adjusted to a volume signal within the system preset range;
and the second input volume adjusting subunit is configured to send the right channel input audio signal to the input volume adjusting unit to perform volume adjustment until the input audio signal is adjusted to a volume signal within the preset range of the system if the right channel input audio signal exceeds the preset volume threshold of the system.
6. The audio signal processing circuit of claim 5, further comprising sixty C60 and fifty-ninth C59 capacitors; the sixteenth capacitor C60 and the fifty-ninth capacitor C59 are filter capacitors;
one end of the sixty-second capacitor C60 is connected to pin 3 of the first comparator U1-a, and the other end is connected to one end of the second resistor R2 and pin 1 of the fifth switch Q5, respectively;
the second input volume adjusting subunit includes: a second switch tube Q2, a first resistor R1, a second input volume adjusting chip U3, a third resistor R3, an eleventh resistor R11, a thirteenth resistor R13, and a twelfth resistor R12;
one end of the fifty-ninth capacitor C59 is connected to the pin 5 of the second comparator U1-B, and the other end is connected to one end of the first resistor R1 and the pin 1 of the second switch tube Q2, respectively;
the other end of the first resistor R1 is grounded;
pins 2 and 3 of the second switch tube Q2 are connected with the second input volume adjusting chip U3;
pin 1 of the second input volume adjusting chip U3 is connected to a power supply terminal VDD, pin 2 is connected to one end of the thirteenth resistor R13, pin 3 is grounded, pin 4 is connected to an end of a CONTROL signal R _ GAIN _ E _ CONTROL of the system controller, pin 5 is connected to one end of the twelfth resistor R12, pin 6 is grounded, pin 7 is connected to one end of the eleventh resistor R11, pin 8 is connected to a CONTROL signal R _ GAIN _ C _ CONTROL of the system controller, pin 9 is connected to a system preset volume threshold terminal VDD _ AUDIO of the system controller, and pin 10 is connected to one end of the third resistor R3;
the other end of the thirteenth resistor R13 is connected to pin 2 of the second switch Q2, and the other end of the twelfth resistor R12, respectively;
the other end of the eleventh resistor R11 is connected to pin 3 of the second switch Q2, respectively, and the channel switching unit;
the other end of the third resistor R3 is connected to pin 3 of the second switch Q2, respectively, and the channel switching unit.
7. The audio signal processing circuit according to claim 6, wherein the channel switching unit includes: a first switching leg and a second switching leg;
the first switch branch circuit is used for selectively switching a left channel audio signal of an externally input audio signal and a left channel audio signal in a system and transmitting the audio signal selectively output to the output volume adjusting unit;
the second switch branch is used for selectively switching a right channel audio signal of an externally input audio signal and a right channel audio signal in the system, and transmitting the audio signal selectively output to the output volume adjusting unit.
8. The audio signal processing circuit according to claim 7, wherein the output volume adjusting unit includes: a first output volume adjusting unit and a second output volume adjusting unit;
the first output volume adjusting unit is configured to adjust the output volume of the received audio signal transmitted by the first switch branch, and output the adjusted audio signal;
and the second output volume adjusting unit is used for adjusting the output volume of the received audio signal transmitted by the second switch branch and outputting the adjusted audio signal.
9. The audio signal processing circuit according to claim 8, wherein the output volume adjusting unit includes: a first capacitor C1, a second capacitor C2 and a volume adjusting chip RT 1;
the RT1 chip has pin 1 connected to ground, pin 2 connected to the output device corresponding to the left channel, pin 3 connected to one end of the first capacitor C1, pin 4 connected to one end of the second capacitor C2, and pin 5 connected to the output device corresponding to the right channel;
the other end of the first capacitor C1 is connected with the first switch branch;
the other end of the second capacitor C2 is connected to the second switch branch.
10. An electronic device, comprising: an audio signal processing circuit as claimed in any one of claims 1 to 9.
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| CN201510212161.1A CN104853290B (en) | 2015-04-29 | 2015-04-29 | A kind of audio signal processing circuit and electronic equipment with the circuit |
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| CN107181996A (en) * | 2017-05-08 | 2017-09-19 | 深圳市创锐实业有限公司 | The method and apparatus that a kind of audio amplitude for audio amplifier is limited |
| CN107862851B (en) * | 2017-12-14 | 2023-08-15 | 威胜信息技术股份有限公司 | MBUS bus transmission signal conversion circuit and conversion method thereof |
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| CN1677849A (en) * | 2004-04-03 | 2005-10-05 | 鸿富锦精密工业（深圳）有限公司 | Sound-volume regulating device and method |
| CN101282111A (en) * | 2008-06-02 | 2008-10-08 | 北京海尔集成电路设计有限公司 | Method and system for controlling sound volume adjustment |
| CN102571011A (en) * | 2011-12-15 | 2012-07-11 | 无锡中星微电子有限公司 | Method and device for adjusting sound volume |
| CN203734823U (en) * | 2013-12-25 | 2014-07-23 | Tcl通力电子（惠州）有限公司 | Audio device |
| CN205123978U (en) * | 2015-04-29 | 2016-03-30 | 青岛歌尔声学科技有限公司 | Audio signal treatment circuit and have electronic equipment of this circuit |
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| TW201218784A (en) * | 2010-10-28 | 2012-05-01 | Optoma Technology Inc | Speaker system and method for optimizing output of speaker thereof |
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| CN1677849A (en) * | 2004-04-03 | 2005-10-05 | 鸿富锦精密工业（深圳）有限公司 | Sound-volume regulating device and method |
| CN101282111A (en) * | 2008-06-02 | 2008-10-08 | 北京海尔集成电路设计有限公司 | Method and system for controlling sound volume adjustment |
| CN102571011A (en) * | 2011-12-15 | 2012-07-11 | 无锡中星微电子有限公司 | Method and device for adjusting sound volume |
| CN203734823U (en) * | 2013-12-25 | 2014-07-23 | Tcl通力电子（惠州）有限公司 | Audio device |
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