CN209642673U - Optical signal detecting device - Google Patents
Optical signal detecting device Download PDFInfo
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- CN209642673U CN209642673U CN201920885687.XU CN201920885687U CN209642673U CN 209642673 U CN209642673 U CN 209642673U CN 201920885687 U CN201920885687 U CN 201920885687U CN 209642673 U CN209642673 U CN 209642673U
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Abstract
The utility model discloses a kind of optical signal detecting device, wherein, including DC power supply, light-receiving component, MCU, limiting amplifier and operational amplifier circuit, the power end of limiting amplifier and the power end of MCU are connect with DC power supply respectively, the input terminal of limiting amplifier is connect with light-receiving component, the simulation output end of MCU and the input terminal of operational amplifier circuit connect, and the output end of operational amplifier circuit and the reference voltage setting end of limiting amplifier connect；Light-receiving component for receiving optical signal, and is converted to voltage detection signal；MCU, for setting the reference voltage signal of limiting amplifier；Limiting amplifier for carrying out limited range enlargement processing to voltage detection signal, and is compared with reference voltage signal, when being greater than or equal to reference voltage signal, exports high level signal, conversely, output low level signal；Operational amplifier circuit, for amplifying adjusting to the reference voltage signal that MCU is exported.Technical solutions of the utility model improve the detection range of optical signal detecting device.
Description
Technical field
The utility model relates to optical signal detecting technical field, in particular to a kind of optical signal detecting device.
Background technique
In existing optical signal detecting device, light-receiving component, limiting amplifier, resistance and single-chip microcontroller are generally comprised.In light
In signal supervisory instrument, different thresholds can be realized by welding different resistance adjustment setting voltage for limiting amplifier
It is worth size, due to the difference of technique, the converted next voltage signal amplitude of optical module is not complete there are certain distribution
It is complete consistent, it needs to be equipped with different setting resistance values and reaches relevant optics judgment threshold, this requires that in the batch of device
Resistance is manually replaced in production, brings manual operation low efficiency and reliability of technology reduces, be not easy to automated production.
This is proposed, micro-control unit is set in optical signal detecting device, replaced using the DAC in micro-control unit
Fixed resistance, to adjust predetermined threshold value voltage, optical signal detecting device needs to be arranged default threshold under the weaker environment of light
Threshold voltage is larger, however the reference voltage of micro-control unit is typically small, and biggish predetermined threshold value voltage cannot be arranged.
Utility model content
The main purpose of the utility model is to propose a kind of optical signal detecting device, it is intended to promote optical signal detecting device
Detection range.
To achieve the above object, the utility model proposes optical signal detecting device, which includes straight
Galvanic electricity source, light-receiving component, MCU, limiting amplifier and operational amplifier circuit, the power end of the limiting amplifier and the MCU's
Power end is connect with the DC power supply respectively, and the input terminal of the limiting amplifier is connect with the light-receiving component, described
The simulation output end of MCU is connect with the input terminal of the operational amplifier circuit, the output end of the operational amplifier circuit and the limited range enlargement
The reference voltage setting end of device connects；
The light-receiving component is converted to voltage detection signal for receiving optical signal, and by the received optical signal
After export to the limiting amplifier；
The MCU, for setting the benchmark of the limiting amplifier in the power end input DC power of the MCU
Voltage signal, and exported by its simulation output end；
The limiting amplifier, for carrying out limited range enlargement processing to the voltage detection signal, and will be after limited range enlargement
Voltage detection signal is compared with the reference voltage signal, and voltage detection signal is greater than or equal to after the limited range enlargement
When reference voltage signal, high level signal is exported, when voltage detection signal is less than reference voltage signal after the limited range enlargement,
Export low level signal；
The operational amplifier circuit, for being amplified to the reference voltage signal that the MCU is exported to the limiting amplifier
It adjusts.
Optionally, the operational amplifier circuit includes operational amplifier, first resistor and second resistance, the operational amplifier
Positive input terminal is the input terminal of the operational amplifier circuit, the first end of the negative input end of the operational amplifier and the first resistor
It is connected with the common end of the first end of the second resistance, the second of the output end of the operational amplifier and the second resistance
End connection, and be the output end of the operational amplifier circuit, the second end ground connection of the first resistor.
Optionally, the setting range of the reference voltage signal of the limiting amplifier is 0~(1+R2/R1) Vref, wherein
R1 is the resistance value of the first resistor of the operational amplifier circuit, and R2 is the resistance value of the second resistance of the operational amplifier circuit, and Vref is described
The corresponding voltage value of reference voltage signal at the simulation output end of MCU.
Optionally, the setting range of reference voltage signal of the limiting amplifier under no light condition is 2.8V-3.0V.
Optionally, the MCU is single-chip microcontroller, and the reference voltage of the simulation output end output of the MCU is 0-1.2V or 0-
2.4V。
Optionally, the MCU includes D/A converting circuit DAC, and the power end of the D/A converting circuit DAC is described
The power end of MCU, the output end of the D/A converting circuit are the simulation output end of the MCU.
Technical solutions of the utility model by using optical signal detecting device include DC power supply, light-receiving component, MCU,
The power end of limiting amplifier and operational amplifier circuit, the power end of the limiting amplifier and the MCU respectively with the direct current
Source connection, the input terminal of the limiting amplifier are connect with the light-receiving component, the simulation output end of the MCU and the fortune
The input terminal connection on electric discharge road, the output end of the operational amplifier circuit are connect with the reference voltage of limiting amplifier setting end；
After the optical signal outside the reception of light-receiving component, received optical signal is converted into voltage detection signal, the voltage inspection of conversion
It surveys signal to export to limiting amplifier, limiting amplifier carries out limited range enlargement processing to the voltage detection signal of input, and clipping is put
There is big device a reference voltage end is arranged, and reference voltage setting end can input a specific reference voltage signal, herein
It is compared by the voltage detection signal that limited range enlargement is handled with the MCU reference voltage signal exported, after limited range enlargement
Voltage detection signal be greater than or equal to reference voltage signal when, export high level signal, indicate light-receiving component detection be have
Light exports low level signal when the voltage detection signal after limited range enlargement is less than reference voltage signal, indicates light-receiving group
Part is detected as unglazed；Reference voltage signal herein is that MCU according to the device property of light-receiving component is adjusted setting, in reality
The range of the simulation output port of MCU is lower in the course of work of border, i.e. MCU is smaller to the setting range of reference voltage signal, and
The higher accuracy that can just guarantee detection that the value setting to reference voltage is needed under no light conditions, just passes through operational amplifier circuit
Processing is amplified to the reference voltage signal of MCU output, so that the reference voltage signal exported to limiting amplifier can be with
Meet biggish setting range.Technical solutions of the utility model improve the detection range of optical signal detecting device.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structural schematic diagram of existing one embodiment of optical signal detecting device；
Fig. 2 is the structural schematic diagram of another embodiment of existing optical signal detecting device；
Fig. 3 is the structural schematic diagram of one embodiment of the utility model optical signal detecting device.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 100 | DC power supply | R1 | First resistor |
| 200 | Light-receiving component | R2 | Second resistance |
| 300 | Limiting amplifier | U1 | Operational amplifier |
| 400 | Operational amplifier circuit |
The realization of the utility model aim, functional characteristics and it can put that the embodiments will be further described with reference to the accompanying drawings.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture)
Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the
Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one
A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of optical signal detecting devices, in existing optical signal detecting device, as shown in Figure 1, tool
There are light-receiving component, limiting amplifier and resistance etc., the optical signal received is converted into voltage signal and inputted by light-receiving component
To limiting amplifier, limiting amplifier has a threshold value setting end, can input a specific voltage to the setting end, i.e. clipping is put
The threshold value and setting voltage for the voltage signal amplitude that big device detects are one-to-one relationships；Here it is arrived by connecting a resistance
Power supply VCC realizes different threshold sizes by welding the different setting voltage of the adjustable realization of different resistance, just needs
Different resistance is manually replaced, reduces production efficiency in this way, and the reliability of technology of optical signal detecting device is low.In Fig. 2
In, also have for artificial replacement resistance and replaces fixed resistance to be adjusted using the D/A conversion unit DAC in MCU, however
The reference voltage of MCU is usually 1.2V, 2.4V, and the voltage range of the output voltage port of D/A conversion unit is smaller, in light
Under weaker environment, the setting of preset reference voltage cannot be reached, will cause the erroneous judgement of limiting amplifier.
To solve the above-mentioned problems, in an embodiment of the utility model, as shown in figure 3, the optical signal detecting device packet
Include DC power supply 100, light-receiving component 200, MCU, limiting amplifier 300 and operational amplifier circuit 400, the limiting amplifier 300
Power end and the power end of the MCU connect respectively with the DC power supply 100, the input terminal of the limiting amplifier 300
It is connect with the light-receiving component 200, the simulation output end of the MCU is connect with the input terminal of the operational amplifier circuit 400, described
The output end of operational amplifier circuit 400 is connect with the reference voltage of the limiting amplifier 300 setting end；
The light-receiving component 200 is converted to voltage detecting letter for receiving optical signal, and by the received optical signal
It exports after number to the limiting amplifier 300；
The MCU, for setting the limiting amplifier 300 in the power end input DC power 100 of the MCU
Reference voltage signal, and by its simulation output end export；
The limiting amplifier 300, for carrying out limited range enlargement processing to the voltage detection signal, and by limited range enlargement
Voltage detection signal is compared with the reference voltage signal afterwards, and voltage detection signal is greater than or waits after the limited range enlargement
When reference voltage signal, high level signal is exported, voltage detection signal is less than reference voltage signal after the limited range enlargement
When, export low level signal；
The operational amplifier circuit 400, for the MCU export to the reference voltage signal of the limiting amplifier 300 into
Row amplification is adjusted.
In the present embodiment, light-receiving component 200 can be to be made of opto-electronic device, functional circuit and optical interface etc., this
In light-receiving component 200 particular by photoelectric conversion, receiving end when receiving optical signal, by the optical signal received turn
It changes electric signal into, after the optical signal input light receiving unit 200 that is to say a constant bit rate, telecommunications is converted to by optical detection diode
Number, the electric signal converted out is just exported to limiting amplifier 300.
Limiting amplifier 300 is can be in optical signal detecting device as amplifier, when the input signal width of amplifier
When degree is more than certain level, amplifier enters nonlinear operation region, and amplitude output signal reaches clipping state.It that is to say defeated
Enter input signal to limiting amplifier 300 it is smaller when, amplifier is in Linear Amplifer working condition, and output follows input linear
Variation；When input signal reaches a certain level, output will not change with the increase of input signal, and maintain certain value
On, that is, it is in clipping operation state.It is understood that be the voltage detection signal of converting light-receiving component 200 here into
Enhanced processing is gone, a certain level in amplifier is the reference voltage letter at reference voltage setting end in limiting amplifier 300
Number, the voltage detection signal after enhanced processing is compared with reference voltage signal, voltage detection signal after limited range enlargement
When more than or equal to reference voltage signal, high level signal is exported, indicates that optical signal detecting device has been detected as light or light
It is relatively strong, when voltage detection signal is less than reference voltage signal after limited range enlargement, low level signal is exported, indicates optical signal detecting dress
Set that be detected as unglazed or light weaker.
MCU is micro-control unit, also known as one chip microcomputer (Single Chip Microcomputer) or monolithic
Machine is central processing unit (Central Process Unit；CPU frequency) and specification do appropriate reduction, and by memory
(memory), the perimeter interfaces such as counter (Timer), USB, A/D conversion, PLC or even LCD driving circuit are all incorporated into single
On chip, the microcomputer of chip-scale is formed, does various combination control for different applications.Such as mobile phone, PC periphery,
Remote controler, until automotive electronics, industrial stepper motor, control of robotic arm etc..In the above-described embodiments, MCU can be right
The reference voltage signal at reference voltage setting end is adjusted in limiting amplifier 300, specifically according in light-receiving component 200
Opto-electronic device, functional circuit etc. characteristic, to the reference voltage signal at reference voltage setting end in limiting amplifier 300 into
The corresponding adjustment of row, is directly arranged resistance on the circuit of limiting amplifier 300 relative to existing, can be to avoid according to light-receiving
The artificial replacement resistance of the difference of component 200, and caused by low efficiency, reliability of technology it is low, improve optical signal detecting device
Production efficiency.
Operational amplifier circuit 400 is can be to the amplifying circuit that signal performs mathematical calculations.It is manufactured using integrated circuit technology
Operational amplifier also has exquisite, cheap and can spirit in addition to the characteristics of maintaining original very high gain and input impedance
The advantages that using living, thus put in active filter, switched-capacitor circuit, digital analog converter and analog-digital converter, direct current signal
Greatly, the generation and transformation and signal processing etc. of waveform obtain very extensive application.In the above-described embodiments, MCU
Reference voltage is smaller, be the simulation output port of MCU range it is lower, and optical signal detecting device will be realized in varying environment
Under optical signal detecting, limiting amplifier 300 just needs biggish reference voltage adjusting range, here by operational amplifier circuit 400
Can the reference voltage signal of MCU simulation output port output amplify processing so that exporting to limiting amplifier 300
Reference voltage signal can satisfy biggish setting range, to improve the detection range of optical signal detecting device.
Technical solutions of the utility model include DC power supply 100, light-receiving component by using optical signal detecting device
200, MCU, limiting amplifier 300 and operational amplifier circuit 400, the power end of the limiting amplifier 300 and the power end of the MCU
It is connect respectively with the DC power supply 100, the input terminal of the limiting amplifier 300 is connect with the light-receiving component 200, institute
The simulation output end for stating MCU is connect with the input terminal of the operational amplifier circuit 400, the output end of the operational amplifier circuit 400 with it is described
The reference voltage setting end of limiting amplifier 300 connects；It, will be received after receiving external optical signal in light-receiving component 200
Optical signal is converted to voltage detection signal, and the voltage detection signal of conversion is exported to limiting amplifier 300, limiting amplifier 300
Limited range enlargement processing is carried out to the voltage detection signal of input, there is limiting amplifier 300 reference voltage end, benchmark is arranged
Voltage setting end can input a specific reference voltage signal, herein by limited range enlargement processing voltage detection signal with
The reference voltage signal of MCU output is compared, and is greater than or equal to reference voltage in the voltage detection signal after limited range enlargement
When signal, high level signal is exported, indicates that light-receiving component 200 has been detected as light, in the voltage detecting letter after limited range enlargement
Number be less than reference voltage signal when, export low level signal, indicate light-receiving component 200 be detected as it is unglazed；Benchmark electricity herein
Pressure signal is that MCU according to the device property of light-receiving component 200 is adjusted setting, the simulation of MCU in practical work process
The range of output port is lower, i.e. MCU is smaller to the setting range of reference voltage signal, and needs under the weaker environment of light
To the higher accuracy that can just guarantee detection of the value setting of reference voltage, the base that just MCU is exported by operational amplifier circuit 400
Quasi- voltage signal amplifies processing so that output to limiting amplifier 300 reference voltage signal can satisfy it is biggish
Range is set.Technical solutions of the utility model improve the detection range of optical signal detecting device.
In one embodiment, as shown in figure 3, the operational amplifier circuit 400 includes operational amplifier U1, first resistor R1 and the
The positive input terminal of two resistance R2, the operational amplifier U1 is the input terminal of the operational amplifier circuit 400, the operational amplifier U1
Negative input end connect with the common end of the first end of the first resistor R1 and the first end of the second resistance R2, the fortune
The output end for calculating amplifier U1 is connect with the second end of the second resistance R2, and is the output end of the operational amplifier circuit 400, institute
State the second end ground connection of first resistor R1.
In the present embodiment, second resistance R2 is the proportion resistor of operational amplifier U1, passes through first resistor R1, second resistance
The reference voltage signal enhanced processing inputted to operational amplifier U1 positive input terminal is realized in the combination of R2 and operational amplifier U1,
With the reference voltage that the output end by operational amplifier U1 is exported to limiting amplifier 300, end is set.So that simulating letter in MCU
The amplification of the reference voltage signal of number output port output, realize limiting amplifier 300 reference voltage setting end have compared with
Range is arranged in big reference voltage.
In the present embodiment, the setting range of the reference voltage signal of the limiting amplifier 300 is 0~(1+R2/R1)
Vref, wherein R1 is the resistance value of the first resistor R1 of the operational amplifier circuit 400, and R2 is the second resistance of the operational amplifier circuit 400
The resistance value of R2, Vref are the corresponding voltage value of reference voltage signal at the simulation output end of the MCU.
It should be noted that the calculation formula of 400 input and output of operational amplifier circuit are as follows: Vsd=Vout=(1+R2/R1) Vin,
Wherein, Vsd is the reference voltage that end is arranged in reference voltage in the limiting amplifier 300, and Vout is that the operational amplifier circuit 400 is defeated
The output voltage of outlet, R1 are the resistance value of the first resistor R1 of the operational amplifier circuit 400, and R2 is the of the operational amplifier circuit 400
The resistance value of two resistance R2, Vin are the corresponding voltage value of reference voltage signal of 400 positive input terminal of operational amplifier circuit input.It can
With understanding, Vin=Vref in the present embodiment, the reference voltage signal of 400 positive input terminal of operational amplifier circuit input is MCU
The reference voltage signal of middle analog voltage output end output.The present embodiment is realized to 400 input terminal input reference of operational amplifier circuit
End is arranged with the reference voltage exported to amplitude limiting amplifier circuit in the amplification of voltage signal.
Based on the above embodiment, the setting range of reference voltage signal of the limiting amplifier 300 under no light condition
For 2.8V-3.0V.It is understood that light-receiving component 200 is just needed to 300 benchmark of limiting amplifier under no light condition
The relatively high of the reference voltage setting at end is arranged in voltage, is traditionally arranged to be 2.8V-3.0V；In the higher of reference voltage signal setting
When, it can just make optical signal detecting device more accurate when detecting the input of optical signal, be not in misjudgment.
Based on the above embodiment, the MCU is single-chip microcontroller, and the reference voltage of the simulation output end output of the MCU is 0-
1.2V or 0-2.4V.
In the present embodiment, the MCU includes D/A converting circuit DAC, and the power end of the D/A converting circuit DAC is institute
The power end of MCU is stated, the output end of the D/A converting circuit is the simulation output end of the MCU.
It should be noted that passing through input and output formula Vsd=Vout=(1+R2/R1) Vin of operational amplifier circuit 400, example
When such as Vin value 2.4V, R1=R2, Vsd=Vout=4.8V, the reference voltage setting end of limiting amplifier 300 is inputted at this time
Reference voltage be 4.8V, just solve accurate detection of the optical signal detecting device to optical signal under no light condition.
The foregoing is merely the alternative embodiments of the utility model, and therefore it does not limit the scope of the patent of the utility model,
It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (6)
1. a kind of optical signal detecting device, which is characterized in that the optical signal detecting device includes DC power supply, light-receiving group
The power end of part, MCU, limiting amplifier and operational amplifier circuit, the power end of the limiting amplifier and the MCU respectively with it is described
DC power supply connection, the input terminal of the limiting amplifier connect with the light-receiving component, the simulation output end of the MCU and
The input terminal of the operational amplifier circuit connects, and end is arranged in the reference voltage of the output end of the operational amplifier circuit and the limiting amplifier
Connection；
The light-receiving component for receiving optical signal, and the received optical signal is converted to defeated after voltage detection signal
Out to the limiting amplifier；
The MCU, for setting the reference voltage of the limiting amplifier in the power end input DC power of the MCU
Signal, and exported by its simulation output end；
The limiting amplifier, for carrying out limited range enlargement processing to the voltage detection signal, and by voltage after limited range enlargement
Detection signal is compared with the reference voltage signal, and voltage detection signal is greater than or equal to benchmark after the limited range enlargement
When voltage signal, high level signal is exported, when voltage detection signal is less than reference voltage signal after the limited range enlargement, output
Low level signal；
The operational amplifier circuit, for amplifying adjusting to the reference voltage signal that the MCU is exported to the limiting amplifier.
2. optical signal detecting device as described in claim 1, which is characterized in that the operational amplifier circuit include operational amplifier,
First resistor and second resistance, the positive input terminal of the operational amplifier are the input terminal of the operational amplifier circuit, and the operation is put
The negative input end of big device is connect with the common end of the first end of the first resistor and the first end of the second resistance, the fortune
Calculate amplifier output end connect with the second end of the second resistance, and be the operational amplifier circuit output end, described first
The second end of resistance is grounded.
3. optical signal detecting device as claimed in claim 2, which is characterized in that the reference voltage signal of the limiting amplifier
Setting range be 0~(1+R2/R1) Vref, wherein R1 be the operational amplifier circuit first resistor resistance value, R2 be the fortune
The resistance value of the second resistance on electric discharge road, Vref are the corresponding voltage value of reference voltage signal at the simulation output end of the MCU.
4. optical signal detecting device as claimed in any one of claims 1-3, which is characterized in that the limiting amplifier is in nothing
The setting range of reference voltage signal under light state is 2.8V-3.0V.
5. optical signal detecting device as described in claim 1, which is characterized in that the MCU is single-chip microcontroller, the mould of the MCU
The reference voltage of quasi- output end output is 0-1.2V or 0-2.4V.
6. optical signal detecting device as claimed in claim 5, which is characterized in that the MCU includes D/A converting circuit DAC,
The power end of the D/A converting circuit DAC is the power end of the MCU, and the output end of the D/A converting circuit is described
The simulation output end of MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920885687.XU CN209642673U (en) | 2019-06-11 | 2019-06-11 | Optical signal detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920885687.XU CN209642673U (en) | 2019-06-11 | 2019-06-11 | Optical signal detecting device |
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| Publication Number | Publication Date |
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| CN209642673U true CN209642673U (en) | 2019-11-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113259012A (en) * | 2021-03-31 | 2021-08-13 | 武汉英飞光创科技有限公司 | Multichannel high-voltage circuit that optical module was used |
| CN117241174A (en) * | 2023-11-10 | 2023-12-15 | 杭州海康威视数字技术股份有限公司 | Audio processing circuit and apparatus |
-
2019
- 2019-06-11 CN CN201920885687.XU patent/CN209642673U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113259012A (en) * | 2021-03-31 | 2021-08-13 | 武汉英飞光创科技有限公司 | Multichannel high-voltage circuit that optical module was used |
| CN117241174A (en) * | 2023-11-10 | 2023-12-15 | 杭州海康威视数字技术股份有限公司 | Audio processing circuit and apparatus |
| CN117241174B (en) * | 2023-11-10 | 2024-02-23 | 杭州海康威视数字技术股份有限公司 | Audio processing circuit and apparatus |
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