CN104853290A - Audio signal processing circuit and electronic equipment with same - Google Patents
Audio signal processing circuit and electronic equipment with same Download PDFInfo
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- CN104853290A CN104853290A CN201510212161.1A CN201510212161A CN104853290A CN 104853290 A CN104853290 A CN 104853290A CN 201510212161 A CN201510212161 A CN 201510212161A CN 104853290 A CN104853290 A CN 104853290A
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Abstract
The invention discloses an audio signal processing circuit and a piece of electronic equipment with the same. The audio signal processing circuit 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, processing the volume of the input audio signal into a volume signal within a system preset range, and sends the audio signal after processing to the channel switching unit. The channel switching unit selectively processes the audio signal according to the channel of the audio signal, and transmits the audio signal after selective processing to the output volume adjusting unit. The output volume adjusting unit adjusts the output volume of the received audio signal, and outputs the audio signal after adjustment. According to the invention, the input volume processing unit processes the volume of an input audio signal into a volume signal within a system preset range so as to make the output volume of audio equipment match the sound at a speaker end, and the distortion probability of audio output is reduced.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of audio signal processing circuit and there is the electronic equipment of this circuit.
Background technology
In existing acoustic product, audio frequency apparatus can receive different input audio signals usually, the audio signal received is sent by Audio Signal Processing.But, design in the process of audio signal processing apparatus inventor, find the input audio signal of existing audio frequency apparatus due to the volume range of audio signal inputted from outside different, cause the sound heard at trumpet end different from the volume that audio frequency apparatus exports, audio signal even due to outside input is excessive or too small, causes the sound heard at trumpet end to occur the phenomenon of distortion; Such as: when the audio signal of outside input is excessive, has exceeded the peak power output of trumpet end, the distortion of output audio signal will be caused.
Summary of the invention
In view of the above problems, proposing the present invention to provide a kind of overcomes the problems referred to above or solves the problem at least in part, and technical scheme of the present invention is achieved in that
On the one hand, the invention provides a kind of audio signal processing circuit, comprising: input volume processing unit, passage bridge unit, output volume adjusting unit;
Described input volume processing unit, receives input audio signal, and the volume of described input audio signal is treated to the signal volume within the scope of systemic presupposition, and the audio signal after described process is sent to described passage bridge unit;
Described passage bridge unit, according to the channel of described audio signal, carries out selection process to audio signal, and will the audio signal transmission after processing be selected to described output volume adjusting unit;
Described output volume adjusting unit, carries out output volume adjusting by the described audio signal received, and the audio signal after described adjustment is exported.
Preferably, described input volume processing unit comprises: input volume judging unit and input sound volume regulation unit;
Described input volume judging unit, receives described input audio signal and systemic presupposition volume threshold; And whether more described input audio signal exceeds described systemic presupposition volume threshold; If described input audio signal exceeds described systemic presupposition volume threshold, then described input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition;
Described input sound volume regulation unit, sends to described passage bridge unit by the audio signal after described adjustment.
Preferably, described input volume judging unit comprises: the first judgment sub-unit and the second judgment sub-unit;
Described first judgment sub-unit, for judging whether L channel input audio signal exceeds described systemic presupposition volume threshold;
Described second judgment sub-unit, for judging whether R channel input audio signal exceeds described systemic presupposition volume threshold.
Preferably, described first judgment sub-unit, comprising: the first comparator U1-A;
The volume threshold end of the left channel signals adjustment signal end pin two welding system controller of described first comparator U1-A pin one welding system controller, pin 3 connects described input sound volume regulation unit one end;
Described second judgment sub-unit comprises: the second comparator U1-B;-
The volume threshold end of the right-channel signals adjustment signal end pin 6 welding system controller of described second comparator U1-B pin 7 welding system controller, pin 5 connects described input sound volume regulation unit one end.
Preferably, described input sound volume regulation unit comprises: the first input volume adjusting subelement and the second input volume adjusting subelement;
Described first input volume adjusting subelement, if exceed described systemic presupposition volume threshold for described L channel input audio signal, then described L channel input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition;
Described second input volume adjusting subelement, if exceed described systemic presupposition volume threshold for described R channel input audio signal, then described R channel input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition.
Preferably,
This circuit also comprises: the 60 electric capacity C60 and the 59 electric capacity C59; Described 60 electric capacity C60 and the 59 electric capacity C59 is filter capacitor;
Described first input volume adjusting subelement comprises: the 5th switching tube Q5, the second resistance R2, the first input volume adjusting chip U2, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10;
First comparator U1-A pin 3 described in described 60 electric capacity C60 mono-termination, the other end connects described second resistance R2 one end respectively, the pin one of described 5th switching tube Q5;
Described second resistance R2 other end ground connection;
The pin two and 3 of described 5th switching tube Q5 connects described input sound volume regulation unit;
Described first input volume adjusting chip U2 pin one meets power end VDD, pin two connects described tenth resistance R10 one end, pin 3 ground connection, pin 4 connects the control signal L_GAIN_E_CONTROL end of described system controller, pin 5 connects described 9th resistance R9 one end, pin 6 ground connection, pin 7 connects described 8th resistance R8 one end, the control signal L_GAIN_C_CONTROL of pin 8 welding system controller, pin 9 meets the systemic presupposition volume threshold end VDD_AUDIO of described system controller, and pin one 0 connects described 7th resistance R7 one end;
The described tenth resistance R10 other end connects the pin two of described 5th switching tube Q5 respectively, the described 9th resistance R9 other end;
The described 8th resistance R8 other end connects the pin 3 of described 5th switching tube Q5 respectively, described passage bridge unit;
The described 7th resistance R7 other end connects the pin 3 of described 5th switching tube Q5 respectively, described passage bridge unit;
Described second input volume adjusting subelement: second switch pipe Q2, the first resistance R1, the second input volume adjusting chip U3, the 7th resistance R3, the 11 resistance R11, the 13 resistance R13, the 12 resistance R12;
Second comparator U1-B pin 5 described in described 59 electric capacity C59 mono-termination, the other end connects described first resistance R1 one end respectively, the pin one of described second switch pipe Q2;
Described first resistance R1 other end ground connection;
The pin two and 3 of described second switch pipe Q2 connects described input sound volume regulation unit;
Described second input volume adjusting chip U3 pin one meets power end VDD, pin two connects described 13 resistance R13 one end, pin 3 ground connection, pin 4 connects the control signal R_GAIN_E_CONTROL end of described system controller, pin 5 connects described 12 resistance R12 one end, pin 6 ground connection, pin 7 connects described 11 resistance R11 one end, the control signal R_GAIN_C_CONTROL pin 9 of pin 8 welding system controller meets the systemic presupposition volume threshold end VDD_AUDIO of described system controller, and pin one 0 connects described 3rd resistance R3 one end;
The described 13 resistance R13 other end connects the pin two of described second switch pipe Q2 respectively, the described 12 resistance R12 other end;
The described 11 resistance R11 other end connects the pin 3 of described second switch pipe Q2 respectively, described passage bridge unit;
The described 3rd resistance R3 other end connects the pin 3 of described second switch pipe Q2 respectively, described passage bridge unit.
Preferably, described passage bridge unit comprises: the first switching branches and second switch branch road;
Described first switching branches, carries out selection for the left channel audio signal of audio signal that inputs in outside and the left channel audio signal of internal system and switches, and the audio signal transmission exported will be selected to described output volume adjusting unit;
Described second switch branch road, carries out selection for the right channel audio signal of audio signal that inputs in outside and the right channel audio signal of internal system and switches, and the audio signal transmission exported will be selected to described output volume adjusting unit.
Preferably, described output volume adjusting unit comprises: the first output volume adjusting unit and the second output volume adjusting unit;
Described first output volume adjusting unit, for the audio signal of the described described first switching branches transmission received is carried out output volume adjusting, and exports the audio signal after described adjustment;
Described second output volume adjusting unit, for the audio signal of the described described second switch branch road transmission received is carried out output volume adjusting, and exports the audio signal after described adjustment.
Preferably, described output volume adjusting unit comprises: the first electric capacity C1, the second electric capacity C2 and volume adjusting chip RT1;
Described volume adjusting chip RT1 pin one ground connection, pin two connects the output equipment of corresponding L channel, and pin 3 connects described first electric capacity C1 one end, and pin 4 connects described second electric capacity C2 one end, and pin 5 connects the output equipment of corresponding R channel;
First switching branches described in described first another termination of electric capacity C1;
Second switch branch road described in described second another termination of electric capacity C2.
The invention provides a kind of electronic equipment, comprising: as above audio signal processing circuit described in any one.
The volume that the signal volume that the volume of input audio signal is treated within the scope of systemic presupposition makes audio frequency apparatus export by input volume processing unit by technical scheme of the present invention and trumpet end sound match, and reduce the distortion probabilities of audio frequency output.
Accompanying drawing explanation
A kind of audio signal processing circuit structural representation that Fig. 1 provides for the embodiment of the present invention;
A kind of audio signal processing circuit figure that Fig. 2 provides for the embodiment of the present invention;
A kind of electronic devices structure schematic diagram that Fig. 3 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As a kind of audio signal processing circuit structural representation that Fig. 1 provides for being depicted as the embodiment of the present invention; This audio signal processing circuit comprises: input volume processing unit 101, passage bridge unit 102, output volume adjusting unit 103;
Described input volume processing unit, receives input audio signal, and the volume of described input audio signal is treated to the signal volume within the scope of systemic presupposition, and the audio signal after described process is sent to described passage bridge unit;
Described passage bridge unit, according to the channel of described audio signal, carries out selection process to audio signal, and will the audio signal transmission after processing be selected to described output volume adjusting unit;
Described output volume adjusting unit, carries out output volume adjusting by the described audio signal received, and the audio signal after described adjustment is exported.
It should be noted that, described input volume processing unit comprises: input volume judging unit and input sound volume regulation unit;
Described input volume judging unit, receives described input audio signal and systemic presupposition volume threshold; And whether more described input audio signal exceeds described systemic presupposition volume threshold; If described input audio signal exceeds described systemic presupposition volume threshold, then described input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition;
Described input sound volume regulation unit, sends to described passage bridge unit by the audio signal after described adjustment.
Based on above embodiment, when described input audio signal comprises: when L channel input audio signal and R channel input audio signal, as shown in Figure 2, be a kind of audio signal processing circuit figure that the embodiment of the present invention provides; This circuit comprises: input volume judging unit, input sound volume regulation unit, passage bridge unit, output volume adjusting unit; Wherein,
Described input volume judging unit comprises: the first judgment sub-unit and the second judgment sub-unit; Described first judgment sub-unit, for judging whether L channel input audio signal exceeds described systemic presupposition volume threshold; Described second judgment sub-unit, for judging whether R channel input audio signal exceeds described systemic presupposition volume threshold.
Described input sound volume regulation unit comprises: the first input volume adjusting subelement and the second input volume adjusting subelement; Described first input volume adjusting subelement, if exceed described systemic presupposition volume threshold for described L channel input audio signal, then described L channel input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition; Described second input volume adjusting subelement, if exceed described systemic presupposition volume threshold for described R channel input audio signal, then described R channel input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition.
Described switching channels switch unit comprises: the first switching branches and second switch branch road; Described first switching branches, carries out selection for the left channel audio signal of audio signal that inputs in outside and the left channel audio signal of internal system and switches, and the audio signal transmission exported will be selected to described output volume adjusting unit; Described second switch branch road, carries out selection for the right channel audio signal of audio signal that inputs in outside and the right channel audio signal of internal system and switches, and the audio signal transmission exported will be selected to described output volume adjusting unit.
Described output volume adjusting unit comprises: the first output volume adjusting unit and the second output volume adjusting unit; Described first output volume adjusting unit, for the audio signal of the described described first switching branches transmission received is carried out output volume adjusting, and exports the audio signal after described adjustment; Described second output volume adjusting unit, for the audio signal of the described described second switch branch road transmission received is carried out output volume adjusting, and exports the audio signal after described adjustment.
Specific implementation circuit based on above functional module is as follows:
Described first judgment sub-unit, comprising: the first comparator U1-A; Described second judgment sub-unit comprises: the second comparator U1-B; Described first input volume adjusting subelement comprises: the 5th switching tube Q5, the second resistance R2, the first input volume adjusting chip U2, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10; Described second input volume adjusting subelement comprises: second switch pipe Q2, the first resistance R1, the second input volume adjusting chip U3, the 7th resistance R3, the 11 resistance R11, the 13 resistance R13, the 12 resistance R12; Described output volume adjusting unit comprises: the first electric capacity C1, the second electric capacity C2 and volume adjusting chip RT1; This circuit also comprises: the 60 electric capacity C60 and the 59 electric capacity C59; Described 60 electric capacity C60 and the 59 electric capacity C59 is filter capacitor; Described 60 electric capacity C60 exchanges with the 59 electric capacity C59 stopping direct current is logical, filtering non-audio interference signal.
The left channel signals adjustment signal end of described first comparator U1-A pin one welding system controller, namely its comparative result is sent to system controller by pin one by described first comparator U1-A, sends corresponding control command signal by Systematical control according to its comparative result; The volume threshold end of described first comparator U1-A pin two welding system controller, pin 3 connects described 60 electric capacity C60 one end;
The described 60 electric capacity C60 other end connects described second resistance R2 one end respectively, the pin one of described 5th switching tube Q5;
Described second resistance R2 other end ground connection;
The pin two and 3 of described 5th switching tube Q5 connects described input sound volume regulation unit;
The right-channel signals adjustment signal end of described second comparator U1-B pin 7 welding system controller, namely its comparative result is sent to system controller by pin 7 by described second comparator U1-B, sends corresponding control command signal by Systematical control according to its comparative result; The volume threshold end of described second comparator U1-B pin 6 welding system controller, pin 5 connects described 59 electric capacity C59 one end;
The described 59 electric capacity C59 other end connects described first resistance R1 one end respectively, the pin one of described second switch pipe Q2;
Described first resistance R1 other end ground connection;
The pin two and 3 of described second switch pipe Q2 connects described input sound volume regulation unit.
Described first input volume adjusting chip U2 pin one meets power end VDD, pin two connects described tenth resistance R10 one end, pin 3 ground connection, pin 4 connects the control signal L_GAIN_E_CONTROL end of described system controller, pin 5 connects described 9th resistance R9 one end, pin 6 ground connection, pin 7 connects described 8th resistance R8 one end, the control signal L_GAIN_C_CONTROL of pin 8 welding system controller, pin 9 meets the systemic presupposition volume threshold end VDD_AUDIO of described system controller, and pin one 0 connects described 7th resistance R7 one end;
The described tenth resistance R10 other end connects the pin two of described 5th switching tube Q5 respectively, the described 9th resistance R9 other end;
The described 8th resistance R8 other end connects the pin 3 of described 5th switching tube Q5 respectively, described passage bridge unit;
The described 7th resistance R7 other end connects the pin 3 of described 5th switching tube Q5 respectively, described passage bridge unit;
Described second input volume adjusting chip U3 pin one meets power end VDD, pin two connects described 13 resistance R13 one end, pin 3 ground connection, pin 4 connects the control signal R_GAIN_E_CONTROL end of described system controller, pin 5 connects described 12 resistance R12 one end, pin 6 ground connection, pin 7 connects described 11 resistance R11 one end, the control signal R_GAIN_C_CONTROL pin 9 of pin 8 welding system controller meets the systemic presupposition volume threshold end VDD_AUDIO of described system controller, and pin one 0 connects described 3rd resistance R3 one end;
The described 13 resistance R13 other end connects the pin two of described second switch pipe Q2 respectively, the described 12 resistance R12 other end;
The described 11 resistance R11 other end connects the pin 3 of described second switch pipe Q2 respectively, described passage bridge unit;
The described 3rd resistance R3 other end connects the pin 3 of described second switch pipe Q2 respectively, described passage bridge unit.
Described passage bridge unit comprises: the first switching branches and second switch branch road; Described first pass branch road and described second switch branch road can adopt integrated chip U4 to realize described passage bridge Elementary Function; Wherein, the integrated chip U4 pin one of described passage bridge unit, pin one 0, pin 9, pin 8, pin 7 realizes described first switching branches function; The integrated chip U4 pin two of described passage bridge unit, pin 3, pin 4 pin 5, pin 6 realizes described second switch branch road function; Physical circuit connects as follows: the integrated chip U4 pin one of described passage bridge unit meets power vd D, and pin one 0 connects described 8th resistance R8 one end respectively, the 7th resistance R7 one end and described 5th switching tube Q5 pin 3; The integrated chip U4 pin 9 of described passage bridge unit connects described first electric capacity C1 one end, the integrated chip U4 pin 8 of described passage bridge unit meets the control signal CHANNEL_SELECT of described system controller, and the integrated chip U4 pin 7 of described passage bridge unit meets the control signal INTERNAL_AUDIO_L of described system controller;
The integrated chip U4 pin two of described passage bridge unit connects described 11 resistance R11 one end respectively, described 3rd resistance R3 one end and described second switch pipe Q2 pin 3; The integrated chip U4 pin 3 of described passage bridge unit connects described second electric capacity C2 one end, and the integrated chip U4 pin 4 of described passage bridge unit meets the control signal CHANNEL_SELECT of described system controller; The integrated chip U4 pin 5 of described passage bridge unit meets the control signal INTERNAL_AUDIO_R of described system controller; Integrated chip U4 pin 6 ground connection of described passage bridge unit.
Described volume adjusting chip RT1 pin one ground connection, pin two meets the output equipment SPK_L of corresponding L channel, and pin 3 connects described first electric capacity C1 one end, and pin 4 connects described second electric capacity C2 one end, and pin 5 meets the output equipment SPK_R of corresponding R channel.
It should be noted that, to be that stopping direct current is logical exchange for described first electric capacity C1 and the effect of the second electric capacity C2, only allows the signal in audiorange arrive two trumpet ends through two electric capacity.
Based on above circuit, exceed systemic presupposition volume threshold for the volume of outside input audio signal below, operation principle of the present invention is described in detail;
Audio signal processing circuit of the present invention normal use time, if do not have external audio plug to insert, then system default uses internal audio signal, output volume adjusting unit Volum_adjuster is input to from the signal pin INTERNAL_AUDIO_L/INTERNAL_AUDIO_R shown in accompanying drawing 2, then, then by output volume adjusting unit Volum_adjuster send audio signal to trumpet end SPK_L and SPK_R.
When not having external audio plug to insert, pin LINE_IN_DETECT is high level as shown in Figure 2, when there being external audio plug to insert, pin LINE_IN_DETECT becomes non-high level state, namely pin LINE_IN_DETECT is connected to system controller, as long as when this signal is non-high level, then think have audio jack to insert.Once after having external audio jack to insert, detect and insert signal LINE_IN_DETECT, then system controller output control signal CHANNEL_SELECT makes the signal outputting to trumpet end be inputted by inside and is switched to outside input.
When external audio signal input, example is input as with left audio, when the amplitude of input audio signal has exceeded the maximum of the audio voltage that within exports, comparator U1-A is particularly adopted to compare systemic presupposition volume threshold voltage and described input audio signal voltage, if described input audio signal voltage exceedes described systemic presupposition volume threshold voltage, then send comparison signal to the ADJUSTABLE_SIGNAL_L pin of system controller by comparator U1-A pin one, system thinks that now input audio signal amplitude has exceeded the maximum of the audio voltage that can export of inner setting, control signal L_GAIN_C_CONTRL and L_GAIN_E_CONTRL will be sent by system controller, by controlling the 7th resistance R7 that the inner integrated transistor collector of described first input volume adjusting chip U2 connects, the 9th resistance R9 that 8th resistance R8 is connected with emitter, the signal of approach to input of the tenth resistance R10 reduces, described minification is the interchange multiplication factor AV=RC/RE of triode, by the control of system controller to L_GAIN_C_CONTRL and L_GAIN_E_CONTRL, AV=R7/R9 can be made, AV=R7/R10, AV=R8/R9, AV=R8/R10 tetra-kinds of gain combination, the resistance of R7/R8/R9/R10 can be selected according to the actual needs, realize different gains successively, further realize controlling by system controller the adjustment the audio signal of input reduced step by step, until the audio signal voltage meeting LINE_IN input is not more than the requirement of VDD_AUDIO.Then, signal through passage bridge unit U4 respective channel, and then through output volume adjusting unit Volum_adjuster, then outputs to Mike SPK_L and holds.In this way the excessive outside input audio signal being input to system from audio interface is carried out reducing process; Thus can reach when different external audio frequency signals inputs, be no more than the object of the maximum volume of the audio signal exported by the audio signal of inside from the max volume of the different audio signals output volume after treatment of outside input, and also eliminate the phenomenon of the excessive distortion caused of audio signal owing to inputting from outside.
About the input audio signal processing procedure of R channel is consistent with the processing procedure of L channel, repeat no more herein.
As shown in Figure 3, be a kind of electronic devices structure schematic diagram that the embodiment of the present invention provides; This electronic equipment comprises: as above arbitrary described audio signal processing circuit.
It should be noted that, the audio signal processing circuit that the embodiment of the present invention provides can also process less audio signal according to the actual needs, by less outside input audio signal process within the scope of systemic presupposition, concrete realizing circuit and principle the same, repeat no more herein.
The volume that the signal volume that the volume of input audio signal is treated within the scope of systemic presupposition makes audio frequency apparatus export by input volume processing unit by technical scheme of the present invention and trumpet end sound match, and reduce the distortion probabilities of audio frequency output.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. an audio signal processing circuit, is characterized in that, comprising: input volume processing unit, passage bridge unit, output volume adjusting unit;
Described input volume processing unit, receives input audio signal, and the volume of described input audio signal is treated to the signal volume within the scope of systemic presupposition, and the audio signal after described process is sent to described passage bridge unit;
Described passage bridge unit, according to the channel of described audio signal, carries out selection process to audio signal, and will the audio signal transmission after processing be selected to described output volume adjusting unit;
Described output volume adjusting unit, carries out output volume adjusting by the described audio signal received, and the audio signal after described adjustment is exported.
2. audio signal processing circuit according to claim 1, is characterized in that, described input volume processing unit comprises: input volume judging unit and input sound volume regulation unit;
Described input volume judging unit, receives described input audio signal and systemic presupposition volume threshold; And whether more described input audio signal exceeds described systemic presupposition volume threshold; If described input audio signal exceeds described systemic presupposition volume threshold, then described input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition;
Described input sound volume regulation unit, sends to described passage bridge unit by the audio signal after described adjustment.
3. audio signal processing circuit according to claim 2, is characterized in that, described input volume judging unit comprises: the first judgment sub-unit and the second judgment sub-unit;
Described first judgment sub-unit, for judging whether L channel input audio signal exceeds described systemic presupposition volume threshold;
Described second judgment sub-unit, for judging whether R channel input audio signal exceeds described systemic presupposition volume threshold.
4. audio signal processing circuit according to claim 3, is characterized in that,
Described first judgment sub-unit, comprising: the first comparator U1-A;
The left channel signals adjustment signal end of described first comparator U1-A pin one welding system controller, the volume threshold end of pin two welding system controller, pin 3 connects described input sound volume regulation unit one end;
Described second judgment sub-unit comprises: the second comparator U1-B;
The right-channel signals adjustment signal end of described second comparator U1-B pin 7 welding system controller, the volume threshold end of pin 6 welding system controller, pin 5 connects described input sound volume regulation unit one end.
5. audio signal processing circuit according to claim 4, is characterized in that, described input sound volume regulation unit comprises: the first input volume adjusting subelement and the second input volume adjusting subelement;
Described first input volume adjusting subelement, if exceed described systemic presupposition volume threshold for described L channel input audio signal, then described L channel input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition;
Described second input volume adjusting subelement, if exceed described systemic presupposition volume threshold for described R channel input audio signal, then described R channel input audio signal is sent to described input sound volume regulation unit, carry out volume adjusting, until described input audio signal is adjusted to the signal volume within the scope of described systemic presupposition.
6. audio signal processing circuit according to claim 5, is characterized in that, this circuit also comprises: the 60 electric capacity C60 and the 59 electric capacity C59; Described 60 electric capacity C60 and the 59 electric capacity C59 is filter capacitor;
Described first input volume adjusting subelement comprises: the 5th switching tube Q5, the second resistance R2, the first input volume adjusting chip U2, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10;
First comparator U1-A pin 3 described in described 60 electric capacity C60 mono-termination, the other end connects described second resistance R2 one end respectively, the pin one of described 5th switching tube Q5;
Described second resistance R2 other end ground connection;
The pin two and 3 of described 5th switching tube Q5 connects described input sound volume regulation unit;
Described first input volume adjusting chip U2 pin one meets power end VDD, pin two connects described tenth resistance R10 one end, pin 3 ground connection, pin 4 connects the control signal L_GAIN_E_CONTROL end of described system controller, pin 5 connects described 9th resistance R9 one end, pin 6 ground connection, pin 7 connects described 8th resistance R8 one end, the control signal L_GAIN_C_CONTROL of pin 8 welding system controller, pin 9 meets the systemic presupposition volume threshold end VDD_AUDIO of described system controller, and pin one 0 connects described 7th resistance R7 one end;
The described tenth resistance R10 other end connects the pin two of described 5th switching tube Q5 respectively, the described 9th resistance R9 other end;
The described 8th resistance R8 other end connects the pin 3 of described 5th switching tube Q5 respectively, described passage bridge unit;
The described 7th resistance R7 other end connects the pin 3 of described 5th switching tube Q5 respectively, described passage bridge unit;
Described second input volume adjusting subelement comprises: second switch pipe Q2, the first resistance R1, the second input volume adjusting chip U3, the 7th resistance R3, the 11 resistance R11, the 13 resistance R13, the 12 resistance R12;
Second comparator U1-B pin 5 described in described 59 electric capacity C59 mono-termination, the other end connects described first resistance R1 one end respectively, the pin one of described second switch pipe Q2;
Described first resistance R1 other end ground connection;
The pin two and 3 of described second switch pipe Q2 connects described input sound volume regulation unit;
Described second input volume adjusting chip U3 pin one meets power end VDD, pin two connects described 13 resistance R13 one end, pin 3 ground connection, pin 4 connects the control signal R_GAIN_E_CONTROL end of described system controller, pin 5 connects described 12 resistance R12 one end, pin 6 ground connection, pin 7 connects described 11 resistance R11 one end, the control signal R_GAIN_C_CONTROL pin 9 of pin 8 welding system controller meets the systemic presupposition volume threshold end VDD_AUDIO of described system controller, and pin one 0 connects described 3rd resistance R3 one end;
The described 13 resistance R13 other end connects the pin two of described second switch pipe Q2 respectively, the described 12 resistance R12 other end;
The described 11 resistance R11 other end connects the pin 3 of described second switch pipe Q2 respectively, described passage bridge unit;
The described 3rd resistance R3 other end connects the pin 3 of described second switch pipe Q2 respectively, described passage bridge unit.
7. audio signal processing circuit according to claim 6, is characterized in that, described passage bridge unit comprises: the first switching branches and second switch branch road;
Described first switching branches, carries out selection for the left channel audio signal of audio signal that inputs in outside and the left channel audio signal of internal system and switches, and the audio signal transmission exported will be selected to described output volume adjusting unit;
Described second switch branch road, carries out selection for the right channel audio signal of audio signal that inputs in outside and the right channel audio signal of internal system and switches, and the audio signal transmission exported will be selected to described output volume adjusting unit.
8. audio signal processing circuit according to claim 7, is characterized in that, described output volume adjusting unit comprises: the first output volume adjusting unit and the second output volume adjusting unit;
Described first output volume adjusting unit, for the audio signal of the described described first switching branches transmission received is carried out output volume adjusting, and exports the audio signal after described adjustment;
Described second output volume adjusting unit, for the audio signal of the described described second switch branch road transmission received is carried out output volume adjusting, and exports the audio signal after described adjustment.
9. audio signal processing circuit according to claim 8, is characterized in that, described output volume adjusting unit comprises: the first electric capacity C1, the second electric capacity C2 and volume adjusting chip RT1;
Described volume adjusting chip RT1 pin one ground connection, pin two connects the output equipment of corresponding L channel, and pin 3 connects described first electric capacity C1 one end, and pin 4 connects described second electric capacity C2 one end, and pin 5 connects the output equipment of corresponding R channel;
First switching branches described in described first another termination of electric capacity C1;
Second switch branch road described in described second another termination of electric capacity C2.
10. an electronic equipment, is characterized in that, comprising: as audio signal processing circuit as described in any one in claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510212161.1A CN104853290B (en) | 2015-04-29 | 2015-04-29 | A kind of audio signal processing circuit and electronic equipment with the circuit |
Applications Claiming Priority (1)
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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 |
| CN107862851A (en) * | 2017-12-14 | 2018-03-30 | 威胜信息技术股份有限公司 | MBUS buses send signaling conversion circuit and its conversion method |
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| CN104853290B (en) | 2018-09-28 |
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