CN103634723A - Audio input circuit and electronic device with audio input - Google Patents
Audio input circuit and electronic device with audio input Download PDFInfo
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- CN103634723A CN103634723A CN201210303952.1A CN201210303952A CN103634723A CN 103634723 A CN103634723 A CN 103634723A CN 201210303952 A CN201210303952 A CN 201210303952A CN 103634723 A CN103634723 A CN 103634723A
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Abstract
The invention relates to the field of an audio circuit and provides an audio input circuit and an electronic device with audio input. The audio input circuit and the electronic device with the audio input detect an audio signal input to an audio input interface is an electret MIC audio signal or a linear audio signal through an audio type detection circuit and generate corresponding detection signals to a CPU; the CPU, based on the detection signals, controls an audio coding and decoding device to perform MIC audio signal or linear audio signal acquisition; and the audio coding and decoding device sends the collected audio signals to the CPU for processing. Therefore, the audio input circuit and the electronic device with the audio input can receive different audio input types through the same interface, thereby solving the problems that in the prior art, the arrangement of two audio input interfaces for receiving electret MIC audio input and linear audio input respectively influences further structural miniaturization of the electronic device with the audio input.
Description
Technical field
The present invention relates to voicefrequency circuit field, relate in particular to audio input circuit and there is the electronic equipment that audio frequency is inputted.
Background technology
Current security device and other electronic equipments with audio frequency input often can use the input of MIC audio frequency and linear audio input, and wherein the input of MIC audio frequency generally adopts electret MIC.And now security device board is tending towards miniaturization, therefore, thereby two audio input interfaces that receive respectively the input of electret MIC audio frequency and linear audio input are set, affect security protection etc. and there is the further miniaturization structurally of electronic equipment that audio frequency inputs.
Summary of the invention
The object of the present invention is to provide a kind of audio input circuit and there is the electronic equipment of audio frequency input, thereby being intended to solve arranges two audio input interfaces that receive respectively the input of electret MIC audio frequency and linear audio input and affect the problem that security protection etc. has the further miniaturization structurally of electronic equipment that audio frequency inputs in prior art.
For this reason, the present invention realizes by the following technical solutions:
An audio input circuit, comprising:
Receive the audio input interface of electret MIC audio signal or linear audio signal;
Audio input end connects described audio input interface, receives the audio signal of described audio input interface input and according to the audio types of described audio input interface input, produces the audio frequency input type testing circuit of corresponding detection signal;
Audio input end audio in connects the audio output of described audio frequency input type testing circuit, bias voltage output micbias connects the bias voltage input of described audio frequency input type testing circuit, for described audio frequency input type testing circuit provides bias voltage and gathers the audio codec of the audio signal of described audio frequency input type testing circuit output;
The detection output of audio frequency input type testing circuit described in detection input termination, control end ctrl meets described audio codec controlled end ctrl, data input pin data in meets the data output end data out of described audio codec, according to the detection signal receiving, controls the CPU that described audio codec carries out MIC audio signal or linear audio signals collecting and the audio signal of described audio codec collection is processed.
The detection output of described audio frequency input type testing circuit comprises that the first detection output and second detects output, and the detection input of described CPU comprises that the first detection input detect1 and second detects input detecet2;
First of described audio frequency input type testing circuit detects output and second and detects the first detection input detect1 and the second detection input detect2 that output meets respectively described CPU.
Described audio frequency input type testing circuit comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, capacitor C 1, triode Q1, comparator U1;
The first end of described capacitor C 1 connects described audio input interface as the audio input end of described audio frequency input type testing circuit, and the second end meets audio input end audio in as the audio output of described audio frequency input type testing circuit;
Audio input interface described in the first termination of described resistance R 8, the second end is as the bias voltage output micbias of audio codec described in the bias voltage input termination of described audio frequency input type testing circuit;
The first output out1 of described comparator U1 and the second output out2 detect output and second as first of described audio frequency input type testing circuit and detect the first detection input detect1 and the second detection input detecet2 that output meets respectively described CPU;
Described resistance R 1 and resistance R 2 are series between power supply VCC and ground GND;
The base stage of described triode Q1 connects the common port of described resistance R 1 and described resistance R 2, and collector electrode meets power supply VCC by resistance R 3, and emitter is by described resistance R 9 ground connection GND;
Described resistance R 4 and described resistance R 5 are connected in series between power supply VCC and ground GND;
The first output out1 and the second output out2 of described comparator U1 meet power supply VCC by described resistance R 7 and described resistance R 6 respectively;
The first reverse input end IN-1 of described comparator U1 connects the common port of described resistance R 4 and described resistance R 5, the first positive input IN+1 connects the collector electrode of described triode Q1, the second reverse input end IN-2 connects the emitter of described triode Q1, and the second positive input connects the base stage of described triode Q1.
The model of described comparator U1 is LM339.
An electronic equipment with audio frequency input, comprises above-described audio input circuit.
The described electronic equipment with audio frequency input comprises security device, computer.
Audio input circuit provided by the invention and there is the electronic equipment of audio frequency input, the audio signal that detects described audio input interface input by described audio types testing circuit is electret MIC audio signal or linear audio signal and produces corresponding detection signal to described CPU, described CPU controls described audio codec according to described detection signal and carries out MIC audio signal or linear audio signals collecting, and described audio codec is sent to described CPU by gathered audio signal and processes.Therefore, audio input circuit provided by the invention and the electronic equipment with audio frequency input can receive different audio frequency input types by same interface, thereby thereby solve and in prior art, need to arrange two audio input interfaces that receive respectively the input of electret MIC audio frequency and linear audio input and affect the problem that security protection etc. has the further miniaturization structurally of electronic equipment that audio frequency inputs.
Accompanying drawing explanation
The schematic block circuit diagram of the audio input circuit that Fig. 1 provides for the embodiment of the present invention;
The circuit theory diagrams of the audio input circuit that Fig. 2 provides for the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.Should be appreciated that specific embodiment described herein, only for explaining the present invention, is not limited to the present invention.
Audio input circuit provided by the invention and there is the electronic equipment of audio frequency input, the audio signal that audio types testing circuit 2 detects audio input interface 1 input is electret MIC audio signal or linear audio signal and produces corresponding detection signal to CPU4, CPU4 controls audio codec 3 according to the detection signal receiving and carries out MIC audio signal or linear audio signals collecting, and audio codec 3 is sent to CPU4 by gathered audio signal and processes.
With reference to Fig. 1, the schematic block circuit diagram of the audio input circuit that the embodiment of the present invention provides.
An audio input circuit, comprising:
Receive the audio input interface 1 of electret MIC audio signal or linear audio signal;
Audio input end connects audio input interface 1, and the audio signal of audio reception input interface 1 input the audio types of inputting according to audio input interface 1 produce the audio frequency input type testing circuit 2 of corresponding detection signal;
Audio input end audio in connects the audio output of audio frequency input type testing circuit 2, bias voltage output micbias connects the bias voltage input of audio frequency input type testing circuit 2, for audio frequency input type testing circuit 2 provides bias voltage and gathers the audio codec 3 of the audio signal of audio frequency input type testing circuit 2 outputs;
Detect the detection output of input ending connecting audio input type testing circuit 2, control end ctrl meets audio codec 3 controlled end ctrl, data input pin data in meets the data output end data out of audio codec 3, according to the detection signal that receives, controls the CPU4 that audio codec 3 carries out MIC audio signal or linear audio signals collecting and audio signal that audio codec 3 is gathered is processed.
With reference to Fig. 2, the circuit theory diagrams of the audio input circuit that the embodiment of the present invention provides.
In the embodiment of the present invention, the detection output of audio frequency input type testing circuit 2 comprises that the first detection output and second detects output, and the detection input of CPU4 comprises that the first detection input detect1 and second detects input detecet2;
First of audio frequency input type testing circuit 2 detects output and second and detects the first detection input detect1 and the second detection input detecet2 that output meets respectively CPU4.
Audio frequency input type testing circuit 2 comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, capacitor C 1, triode Q1, comparator U1;
The first end of capacitor C 1 connects audio input interface 1, the second end as the audio input end of audio frequency input type testing circuit 2 and meets audio input end audio in as the audio output of audio frequency input type testing circuit 2;
The first termination audio input interface 1, the second end of resistance R 8 is as the bias voltage output micbias of the bias voltage input termination audio codec 3 of audio frequency input type testing circuit 2;
The first output out1 of comparator U1 and the second output out2 detect output and second as first of audio frequency input type testing circuit 2 and detect the first detection input detect1 and the second detection input detect2 that output meets respectively CPU4;
Resistance R 1 and resistance R 2 are series between power supply VCC and ground GND;
The base stage connecting resistance R1 of triode Q1 and the common port of resistance R 2, collector electrode meets power supply VCC by resistance R 3, and emitter is by resistance R 9 ground connection GND;
Resistance R 4 and resistance R 5 are connected in series between power supply VCC and ground GND;
The first output out1 and the second output out2 of comparator U1 meet power supply VCC by resistance R 7 and resistance R 6 respectively;
The first reverse input end IN-1 connecting resistance R4 of comparator U1 and the common port of resistance R 5, the first positive input IN+1 connects the collector electrode of triode Q1, and the second reverse input end IN-2 connects the emitter of triode Q1, and the second positive input connects the base stage of triode Q1.
In the present embodiment, the model of described comparator U1 is LM339.
The embodiment of the present invention also provides a kind of electronic equipment with audio frequency input, comprises above-described audio input circuit.
This electronic equipment with audio frequency input comprises security device, computer.
Below, with reference to Fig. 2, the operation principle of audio input circuit provided by the invention is explained as follows.
Because there is field effect transistor electret MIC inside, carry out impedance transformation, input impedance is less; And linear audio impedance is generally at tens K Ω.So the audio frequency input type testing circuit 2 of audio input circuit provided by the invention adopts the mode that detects input impedance to detect the type of inputting audio frequency.The impedance differential responses of access are in the base stage of triode Q1, collector electrode, voltage on emitter is not identical yet, then pass through comparator U1, produce the first detection signal detect1 and the second detection signal detect2 to CPU4, CPU4 sends a control signal to the controlled end ctrl of audio codec 3 according to the first detection signal detect1 and the second detection signal detect2 that receive from control end ctrl, control audio codec 3 and carry out MIC audio signal or linear audio signals collecting, audio codec 3 is sent to the audio signal of collection the data input pin data in of CPU4 by data output end data out, CPU4 processes the audio signal receiving accordingly afterwards.
Be specially, the first reverse input end IN-1 that the common port of series resistance R4 and resistance R 5 is comparator U1 provides the first reference potential, and the second positive input IN+2 that the common port of series resistance R1 and resistance R 2 is comparator U1 provides the second reference potential.
When the electret MIC audio signal of audio input interface 1 access or linear audio signal, because the input impedance of electret MIC and the input impedance of linear audio differ larger, therefore the variation of the different sizes of impedance of the impedance of access and resistance R 9 emitter that causes triode Q1 afterwards in parallel, and then cause the variation of current potential of the collector and emitter of triode Q1, the i.e. change of the first positive input IN+1 of comparator U1 and the current potential of the second reverse input end IN-2.
The the first positive input IN+1 of comparator U1 after change and the current potential of the second reverse input end IN-2 compare with the current potential of the first reverse input end IN-1 and the second positive input IN+2 respectively, export corresponding level signal after relatively to first of CPU4, to detect input detect1 and second and detect input detect2 from the first output out1 and the second output out2.
In addition, because the level of electret MIC audio frequency input is lower, therefore, in embodiments of the present invention, the first termination audio input interface 1 of resistance R 8, the second end is as the bias voltage output micbias of the bias voltage input termination audio codec 3 of audio frequency input type testing circuit 2, and the first end of resistance R 8 is also by resistance R 9 ground connection.When audio frequency input type testing circuit 2 detects input type and is electret MIC audio input signal, when carrying out MIC audio signal sample, CPU4 control audio codec 3 controls second end of audio codec 3 from bias voltage output micbias output offset voltage-drop loading to resistance R 8, due to resistance R 8 and resistance R 9 series connection ground connection, therefore the common port of resistance R 8 and resistance R 9 is clamped down on to a bias voltage, thereby provide a bias voltage for the input of electret MIC audio frequency.
In sum, audio input circuit provided by the invention and there is the electronic equipment of audio frequency input, the audio signal that audio types testing circuit 2 detects audio input interface 1 input is electret MIC audio signal or linear audio signal and produces corresponding detection signal to CPU4, CPU4 controls audio codec 3 according to this detection signal and carries out MIC audio signal or linear audio signals collecting, and audio codec 3 is sent to CPU4 by gathered audio signal and processes.Therefore, audio input circuit provided by the invention and the electronic equipment with audio frequency input can receive different audio frequency input types by same interface, thereby thereby solve and in prior art, need to arrange two audio input interfaces that receive respectively the input of electret MIC audio frequency and linear audio input and affect the problem that security protection etc. has the further miniaturization structurally of electronic equipment that audio frequency inputs.
The above is the preferred embodiments of the present invention, and it describes comparatively concrete and in detail, is not limited to the present invention, all any modifications of doing within principle of the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. an audio input circuit, is characterized in that, comprising:
Receive the audio input interface (1) of electret MIC audio signal or linear audio signal;
Audio input end connects described audio input interface (1), receives the audio signal of described audio input interface (1) input and according to the audio types of described audio input interface (1) input, produces the audio frequency input type testing circuit (2) of corresponding detection signal;
Audio input end audio in connects the audio output of described audio frequency input type testing circuit (2), bias voltage output micbias connects the bias voltage input of described audio frequency input type testing circuit (2), for described audio frequency input type testing circuit (2) provides bias voltage and gathers the audio codec (3) of the audio signal of described audio frequency input type testing circuit (2) output;
The detection output of audio frequency input type testing circuit (2) described in detection input termination, control end ctrl meets described audio codec (3) controlled end ctrl, data input pin data in meets the data output end data out of described audio codec (3), according to the detection signal receiving, controls the CPU(4 that described audio codec (3) carries out MIC audio signal or linear audio signals collecting and audio signal that described audio codec (3) is gathered is processed).
2. audio input circuit as claimed in claim 1, it is characterized in that, the detection output of described audio frequency input type testing circuit (2) comprises that the first detection output and second detects output, described CPU(4) detection input comprise that the first detection input detect1 and second detects input detecet2;
First of described audio frequency input type testing circuit (2) detects output and second and detects output and meet respectively described CPU(4) first detect input detect1 and second and detect input detecet2.
3. audio input circuit as claimed in claim 2, it is characterized in that, described audio frequency input type testing circuit (2) comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, capacitor C 1, triode Q1, comparator U1;
The first end of described capacitor C 1 connects described audio input interface (1) as the audio input end of described audio frequency input type testing circuit (2), and the second end meets audio input end audio in as the audio output of described audio frequency input type testing circuit (2);
Audio input interface (1) described in the first termination of described resistance R 8, the second end is as the bias voltage output micbias of audio codec (3) described in the bias voltage input termination of described audio frequency input type testing circuit (2);
The first output out1 of described comparator U1 and the second output out2 detect output and second as first of described audio frequency input type testing circuit (2) and detect output and meet respectively described CPU(4) first detect input detect1 and second and detect input detect2;
Described resistance R 1 and resistance R 2 are series between power supply VCC and ground GND;
The base stage of described triode Q1 connects the common port of described resistance R 1 and described resistance R 2, and collector electrode meets power supply VCC by resistance R 3, and emitter is by described resistance R 9 ground connection GND;
Described resistance R 4 and described resistance R 5 are connected in series between power supply VCC and ground GND;
The first output out1 and the second output out2 of described comparator U1 meet power supply VCC by described resistance R 7 and described resistance R 6 respectively;
The first reverse input end IN-1 of described comparator U1 connects the common port of described resistance R 4 and described resistance R 5, the first positive input IN+1 connects the collector electrode of described triode Q1, the second reverse input end IN-2 connects the emitter of described triode Q1, and the second positive input connects the base stage of described triode Q1.
4. audio input circuit as claimed in claim 3, is characterized in that, the model of described comparator U1 is LM339.
5. an electronic equipment with audio frequency input, is characterized in that, described in there is audio frequency input electronic equipment comprise the audio input circuit as described in claim 1-4.
6. the electronic equipment with audio frequency input as claimed in claim 5, is characterized in that, described in there is audio frequency input electronic equipment comprise security device, computer.
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| CN201210303952.1A CN103634723B (en) | 2012-08-24 | 2012-08-24 | Audio input circuit and the electronic equipment with audio input |
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| CN201210303952.1A CN103634723B (en) | 2012-08-24 | 2012-08-24 | Audio input circuit and the electronic equipment with audio input |
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| CN103634723B CN103634723B (en) | 2017-06-16 |
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| CN111241018A (en) * | 2018-11-28 | 2020-06-05 | 比亚迪股份有限公司 | Audio starting circuit, interface circuit and terminal of Type-C USB interface |
| CN111857639A (en) * | 2020-06-28 | 2020-10-30 | 浙江大华技术股份有限公司 | Audio input signal detection system, method, computer device and storage medium |
| CN113777477A (en) * | 2021-07-02 | 2021-12-10 | 浙江大华技术股份有限公司 | Circuit performance detection method and detection device |
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Address after: 518055 Shenzhen, Nanshan District hi tech park, North West New West Road, building No. five galaxy on the third floor Patentee after: Shenzhen Launch Digital Technology Co., Ltd. Address before: 518055 Shenzhen, Nanshan District hi tech park, North West New West Road, building No. five galaxy on the third floor Patentee before: Shenzhen Launch Digital Technology Co., Ltd. |