CN219248062U - Audio detection device - Google Patents
Audio detection device Download PDFInfo
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- CN219248062U CN219248062U CN202223381092.1U CN202223381092U CN219248062U CN 219248062 U CN219248062 U CN 219248062U CN 202223381092 U CN202223381092 U CN 202223381092U CN 219248062 U CN219248062 U CN 219248062U
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Abstract
The utility model provides an audio detection device; the device comprises: the device comprises an optocoupler module, a voltage division protection circuit and a control unit; the voltage division protection circuit is respectively connected with the optocoupler module and the control unit; judging whether the audio signal is an external connector interference signal or not through the optical coupling module and the voltage division protection circuit; the voltage division protection circuit is used for outputting corresponding level signals according to the judgment result; the level signal is high level or low level; the control unit is used for controlling the working state of the audio playing module according to the level signal; the working state is a playing state or a mute state; according to the utility model, under the condition of plugging and unplugging the external connector wire harness, the wire harness plugging and unplugging interference signal is judged, so that the interference signal noise caused by wrong playing of the driving loudspeaker due to the fact that the interference signal led in by plugging and unplugging the external connector wire harness is amplified by the audio power amplifier is avoided, and the driving safety hidden trouble caused by the driving of the driving loudspeaker is ensured, and the safe use of the audio power amplifier on the vehicle is ensured.
Description
Technical Field
The utility model relates to the field of automobile electronics, in particular to an audio playing circuit, and particularly relates to an audio detection device.
Background
Fig. 1 shows a schematic block diagram of a car audio power amplifier in the prior art, and as shown in fig. 1, the car audio power amplifier mainly includes: 1) External audio input: a connector harness audio signal; 2) A sound source input module; 3) An audio power amplifier module; 4) Load: a speaker; specifically, the specific implementation method of the existing vehicle-mounted cabin audio power amplifier comprises the following steps: and inputting the audio signal on the external connector harness to the sound source input module, directly transmitting the audio signal to the audio power amplification module by the sound source input module, and finally driving the load loudspeaker by the audio power amplification module to realize the playing source.
The sound source input module receives the audio signal from the external connector harness, the mode is easy to be interfered by the plugging fluctuation of the external connector, the sound source interference signal is amplified by the audio power amplification module, the driving loudspeaker is caused to play wrong interference signal noise, the interference signal noise causes the uneasy emotion of a driver or the unexpected action of equipment for receiving the audio input by the automobile, and therefore the driving safety hidden trouble is brought.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide an audio detection device, which is used for solving the problem in the prior art that the playing source of the load speaker is unstable due to voltage fluctuation caused by plugging and unplugging of an external audio harness.
To achieve the above and other related objects, the present utility model provides an audio detecting apparatus comprising: the device comprises an optocoupler module, a voltage division protection circuit and a control unit;
the voltage division protection circuit includes: a first resistor and a second resistor; one end of the first resistor is connected with the optocoupler module, and the other end of the first resistor is connected with one end of the second resistor and the control unit respectively; the other end of the second resistor is grounded.
The voltage division protection circuit further includes: a first capacitor; one end of the first capacitor is connected with one end of the second resistor, and the other end of the first capacitor is grounded.
The voltage division protection circuit further includes: a first diode; the positive electrode of the first diode is grounded, and the negative electrode of the first diode is connected with one end of the second resistor.
The first diode is a schottky diode.
The optocoupler module includes: a photocoupler; the first end and the second end of the photoelectric coupler are used for receiving the audio signal, the third end of the photoelectric coupler is used for being connected with a power supply, and the fourth end of the photoelectric coupler is connected with the voltage division protection circuit.
The optocoupler module further includes: a third resistor and a fourth resistor; one end of the third resistor and one end of the fourth resistor are used for receiving the audio signal, and the other end of the third resistor is connected with the first end of the photoelectric coupler; the other end of the fourth resistor is connected with the second end of the photoelectric coupler.
The control unit comprises an MCU; the MCU is connected with the voltage division protection circuit, and is also used for controlling the working state of the audio playing module according to the level signal.
The working principle of the utility model is as follows: the optical coupling module is used for receiving an audio signal from an external connector harness, performing isolation coupling amplification on the audio signal, generating an electric signal and outputting the electric signal to the voltage division protection circuit; the voltage division protection circuit is respectively connected with the optocoupler module and the control unit and is used for carrying out system control level matching on the electric signals and carrying out voltage division protection on the electric signals; judging whether the audio signal is an external connector interference signal or not through the optocoupler module and the voltage division protection circuit; the voltage division protection circuit is used for outputting corresponding level signals according to the judgment result; the level signal is high level or low level; the control unit is used for controlling the working state of the audio playing module according to the level signal; the working state is a playing state or a mute state; different level signals correspond to different operating states.
Further, the audio detection device is connected with an external connector wire harness in a plug-in mode, and the external connector wire harness is connected with an audio signal; an external connector harness transmits an audio signal to the audio detection device; the audio detection device is connected with the audio playing module and controls the working state of the audio playing module.
Specifically, the sound source input module is arranged between the external connector harness and the audio detection device; the external connector wire harness is connected with the audio input module in a plug-in mode; the sound source input module is also connected with the audio detection device; the audio power amplifier module is arranged between the audio detection device and the audio play module, and the audio power amplifier module is respectively connected with the audio detection device and the audio play module.
As described above, the audio detection device of the present utility model has the following advantages:
compared with the prior art, the utility model has the advantages that under the condition of plugging and unplugging the external connector wiring harness, the interference signal caused by plugging and unplugging the external connector wiring harness is judged, so that the interference signal noise which drives the loudspeaker to play the error is avoided because the interference signal led by plugging and unplugging the external connector wiring harness is amplified through the audio power amplifier, thereby bringing about driving safety hidden trouble and ensuring the safe use of the audio power amplifier on the vehicle.
Drawings
Fig. 1 is a schematic block diagram of a car audio power amplifier in the prior art.
Fig. 2 is a schematic structural diagram of an audio detection device according to an embodiment of the utility model.
Fig. 3 is a schematic diagram illustrating an operation sequence of the audio detection device according to an embodiment of the utility model.
Fig. 4 is a schematic diagram of an audio detection apparatus according to an embodiment of the utility model.
Detailed Description
The following specific examples are presented to illustrate the present utility model, and those skilled in the art will readily appreciate the additional advantages and capabilities of the present utility model as disclosed herein. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
See fig. 2-4. Compared with the prior art, the audio detection device provided by the utility model has the advantages that under the condition of plugging and unplugging an external connector wiring harness, the interference signal caused by plugging and unplugging the external connector wiring harness is judged, so that the interference signal noise caused by wrong playing of a driving loudspeaker due to the fact that the interference signal led by plugging and unplugging the external connector wiring harness is amplified by an audio power amplifier is avoided, the driving safety hidden trouble is brought, and the safe use of the audio power amplifier on a vehicle is ensured; the audio detection system provided by the utility model has the advantages of high response speed, low manufacturing cost and easiness in implementation.
As shown in fig. 2 and 3, the audio detecting apparatus of the present utility model is applied to an on-vehicle audio detecting system 1; specifically, the in-vehicle audio detection system 1 includes: an external connector harness 11, a sound source input module 12, an audio power amplifier module 13, a speaker 14 and an audio detection device 15.
Wherein the external connector harness 11 is used for inputting audio signals to the sound source input module 12; the sound source input module 12 outputs an initial sound source to the audio detecting apparatus 15; the output signal of the audio detection device 15 is input to the audio power amplifier module 13; the audio power amplifier module 13 is connected with a loudspeaker 14.
The number of speakers 14 is not limited to the present utility model, and may be set according to the specific application scenario in practical applications.
As shown in fig. 2, in the present embodiment, the car audio detection system 1 is described by taking an example in which two speakers 14 are included.
As shown in fig. 2, in the present embodiment, the audio detecting apparatus 15 includes: the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first diode D1, the first capacitor C1, the photocoupler 1511 and the MCU153.
The third resistor R3, the fourth resistor R4 and the optocoupler 1511 form an optocoupler module 151; the first resistor R1 and the second resistor R2 form a voltage dividing unit; the first diode D1 is used as a protection unit; the first capacitor C1 is used as a filtering unit; the voltage division unit, the protection unit and the filtering unit form a voltage division protection circuit 152; the MCU153 serves as a control unit.
The first resistor R1 and the second resistor R2 are first-stage protection, and are used for dividing the voltage of the electric signal output by the optocoupler module 151 due to overhigh voltage; the first diode D1 is used as a voltage stabilizing tube of a protection device, and is used for carrying out second-stage protection on the existence of transient voltage overshoot after the voltage division of the electric signal; the first capacitor C1 is used for filtering the interference signal.
The first resistor R1, the second resistor R2, the first diode D1 and the first capacitor C1 can be adjusted according to the actual application scenario.
The purpose of the voltage division protection circuit 152 is to perform system control level matching on the electrical signal output from the optocoupler module 151.
As shown in fig. 2, one end of the third resistor R3 is connected to the first end (1) of the sound source input module 12, and the other end of the third resistor R3 is connected to the first end (1) of the photo coupler 1511; one end of the fourth resistor R4 is connected with the second end (2) of the sound source input module 12, and the other end of the fourth resistor R4 is connected with the second end (2) of the photoelectric coupler 1511; the third terminal (3) of the photo coupler 1511 is used for connecting with a power supply VCC, and the fourth terminal (4) of the photo coupler 1511 is connected with one end of the first resistor R1; the other end of the first resistor R1 is respectively connected with one end of the second resistor R2, the cathode of the first diode D1, one end of the first capacitor C1 and the GPIO end of the MCU 153; the other end of the second resistor R2, the anode of the first diode D1 and the other end of the first capacitor C1 are grounded; the MUTE terminal (MUTE control terminal) of the MCU153 is connected to the audio power amplifier module 13.
The third resistor R3 and the fourth resistor R4 serve as current limiting resistors.
As shown in fig. 2, the photocoupler 1511 includes a light emitting diode and a triode.
The anode of the light emitting diode is used as a first end (1) of the photoelectric coupler 1511 and is connected with the other end of the third resistor R3; the cathode of the light emitting diode is used as a second end (2) of the photoelectric coupler 1511 and is connected with the other end of the fourth resistor R4; the collector of the triode is used as a third end (3) of the photoelectric coupler 1511 and is connected with a power supply VCC; an emitter of the triode is connected to one end of the first resistor R1 as a fourth terminal (4) of the photocoupler 1511.
When the input audio source is output to be in a high-level ON state through the optocoupler module 151 and the voltage division protection circuit 152, the GPIO port of the MCU153 is in a high level, and the MUTE signal of the MUTE end of the MCU153 is in a high output; when the input audio source is not detected, the voltage division protection circuit 152 outputs a low level OFF state, and the GPIO port of the MCU153 is low level, and the MUTE signal of the MUTE end of the MCU153 is low output.
Judging an external connector interference signal source by utilizing the combination of the optocoupler module 151 and the voltage division protection circuit 152, if the external connector interference signal source is a connector plug interference signal (namely, the sound source is not detected), the triode of the optocoupler 1511 is not conducted, and the voltage division protection circuit 152 does not output an effective signal OFF state and is in a low level; if the input is a normal sound source input, the transistor of the photocoupler 1511 is turned ON, and the voltage division protection circuit 152 outputs an active signal in an ON state at a high level.
As shown in fig. 3, after the external connector harness 11 is inserted, the sound source play is a continuous signal; if the signal is an interference signal (during plugging), the interference signal is discontinuous and cannot be used as a judging condition for conducting the triode of the photocoupler 1511; if the signal is continuous, the triode of the optocoupler 1511 is turned on.
The audio power amplifier module 13 drives a loudspeaker 14 to play a sound source; the preconditions for the loudspeaker 14 to play the sound source are: when receiving the MUTE signal of the MUTE end of the MCU153 as high level, the audio power amplifier module 13 works, and the loudspeaker 14 plays a sound source; when the MUTE signal at the MUTE end of the MCU153 is received at a low level, the audio power amplifier module 13 does not operate, and the speaker 14 is MUTE.
It should be noted that, the above-mentioned audio input module 12 (for connecting the audio signal on the external connector harness 11 and inputting it to the subsequent device, in this embodiment, the subsequent device is the audio detection device 15) and the audio power amplifier module 13 (for amplifying the power of the signal) are all conventional technical means in the field, and the specific structural composition and working principle thereof are not used as conditions for limiting the present utility model, so they will not be described in detail herein.
According to the vehicle-mounted audio detection system provided by the embodiment of the utility model, under the condition of plugging the external connector wire harness, the wire harness plugging interference signal is judged, so that the interference signal noise caused by the error playing of the driving loudspeaker due to the fact that the interference signal led in by plugging the external connector wire harness is amplified by the audio power amplifier is avoided, thereby bringing about driving safety hazards, ensuring the safe use of the on-vehicle audio power amplifier, and being high in response speed, low in manufacturing cost and easy to implement.
The following describes the technical solution in the embodiment of the present utility model in detail with reference to the drawings in the embodiment of the present utility model.
As shown in fig. 2, in an embodiment, the audio detection apparatus of the present utility model includes: the optocoupler module 151, the voltage division protection circuit 152, and a control unit (not shown in the drawings, corresponding to the "MCU153" in the above embodiment).
Specifically, the optocoupler module 151 is configured to receive an audio signal from the external connector harness 11, and to perform isolated coupling amplification on the audio signal, generate an electrical signal, and output the electrical signal to the voltage division protection circuit 152; the voltage division protection circuit 152 is respectively connected with the optocoupler module 151 and the control unit, and the voltage division protection circuit 152 is used for performing system control level matching on the electric signal and performing voltage division protection on the electric signal.
Judging whether the audio signal is an external connector interference signal or not through the optocoupler module 151 and the voltage division protection circuit 152; the voltage division protection circuit 152 is configured to output a corresponding level signal according to the determination result; the level signal is high level or low level; the control unit is used for controlling the working state of the audio playing module (corresponding to the loudspeaker 14 in the embodiment) according to the level signal; the working state is a playing state or a mute state; different level signals correspond to different operating states.
In one embodiment, if the audio signal is an external connector interference signal, the level signal is low; if the audio signal is not an external connector interference signal, the level signal is high.
In an embodiment, if the level signal is at a high level, the control unit controls the audio playing module to be in a playing state; if the level signal is low level, the control unit controls the audio playing module to be in a mute state.
As shown in fig. 2, in one embodiment, the voltage division protection circuit 152 includes: a first resistor R1 and a second resistor R2.
Specifically, one end of the first resistor R1 is connected to the optocoupler module 151, and the other end of the first resistor R1 is connected to one end of the second resistor R2 and the control unit, respectively; the other end of the second resistor R2 is grounded.
The first resistor R1 and the second resistor R2 form a voltage dividing unit.
As shown in fig. 2, in an embodiment, the voltage division protection circuit 152 further includes: a first capacitor C1.
Specifically, one end of the first capacitor C1 is connected to one end of the second resistor R2, and the other end of the first capacitor C1 is grounded.
It should be noted that, the first capacitor C1 is used as a filtering unit for filtering the interference signal.
As shown in fig. 2, in an embodiment, the voltage division protection circuit 152 further includes: a first diode D1.
Specifically, the positive electrode of the first diode D1 is grounded, and the negative electrode of the first diode D1 is connected to one end of the second resistor R2.
The first diode D1 serves as a protection unit.
In one embodiment, as shown in fig. 2, the first diode D1 is a schottky diode.
As shown in fig. 2, in an embodiment, the optocoupler module 151 includes: a photo coupler 1511.
Specifically, the first end (1) and the second end (2) of the photo coupler 1511 are configured to receive the audio signal, the third end (3) of the photo coupler 1511 is configured to be connected to a power VCC, and the fourth end (4) of the photo coupler 1511 is connected to one end of the first resistor R1 of the voltage division protection circuit 152.
As shown in fig. 2, in an embodiment, the optocoupler module 151 further includes: a third resistor R3 and a fourth resistor R4.
Specifically, one end of the third resistor R3 and one end of the fourth resistor R4 are used for receiving the audio signal, and the other end of the third resistor R3 is connected with the first end (1) of the photocoupler 1511; the other end of the fourth resistor R4 is connected to the second end (2) of the photocoupler 1511.
As shown in fig. 2, in one embodiment, the control unit includes an MCU153.
Specifically, the MCU153 is connected to the other end of the first resistor R1 of the voltage division protection circuit 152, and the MCU153 is further configured to control the working state of the audio playing module according to the level signal.
It should be noted that, the operation principle of the audio detection device is the same as that of the above-mentioned vehicle audio detection system 1, so detailed description thereof is omitted here.
As shown in fig. 4, the present utility model further provides an audio detection system, the system comprising: an external connector harness 41, an audio playing module 42, and the above-described audio detecting device 43.
Specifically, the external connector harness 41 is connected to the audio detection device 43 in a pluggable manner, and the external connector harness 41 is used for transmitting an audio signal to the audio detection device 43; the audio detecting device 43 is connected with the audio playing module 42, and the audio detecting device 43 is used for controlling the working state of the audio playing module 42.
As shown in fig. 4, in an embodiment, the audio playing module 42 includes at least one speaker 421.
As shown in fig. 4, the audio playing module 42 includes two speakers 421.
As shown in fig. 4, in an embodiment, the system further includes: a sound source input module 44 and an audio power amplifier module 45.
Specifically, the sound source input module 44 is interposed between the external connector harness 41 and the audio detection device 43; the external connector harness 41 is connected with the audio input module 44 in a plug-in manner, and is used for inputting an audio signal to the audio input module 44; the audio input module 44 obtains an initial sound source, and the sound source input module 44 is further connected to the audio detection device 43, and is used for inputting the initial sound source to the audio detection device 43; the audio power amplifier module 45 is interposed between the audio detection device 43 and the audio playing module 42, and the audio power amplifier module 45 is connected with the audio detection device 43 and the audio playing module 42 respectively.
It should be noted that, the operation principle of the audio detection system is the same as that of the above-mentioned vehicle audio detection system 1, so detailed description thereof is omitted here.
In summary, compared with the prior art, in the audio detection device, under the condition of plugging an external connector harness, the interference signal of the harness plugging is judged, so that the interference signal noise caused by the fact that the external connector harness is plugged and the interference signal is amplified through the audio power amplifier, which causes the wrong playing of a driving loudspeaker, is avoided, and therefore, the driving safety hidden trouble is brought, and the safe use of the audio power amplifier on the vehicle is ensured; the audio detection system provided by the utility model has the advantages of high response speed, low manufacturing cost and easiness in implementation; therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (2)
1. An audio detection device, the device comprising: the device comprises an optocoupler module, a voltage division protection circuit and a control unit; wherein, the voltage division protection circuit includes: a first resistor and a second resistor;
one end of the first resistor is connected with the optocoupler module, and the other end of the first resistor is connected with one end of the second resistor and the control unit respectively; the other end of the second resistor is grounded,
the voltage division protection circuit further includes: a first capacitor;
one end of the first capacitor is connected with one end of the second resistor, and the other end of the first capacitor is grounded;
the voltage division protection circuit further includes: a first diode;
the positive electrode of the first diode is grounded, the negative electrode of the first diode is connected with one end of the second resistor,
the optocoupler module includes: a photocoupler;
the photoelectric coupler comprises a first end, a second end, a third end and a fourth end, the third end of the photoelectric coupler is connected with the fourth end of the power photoelectric coupler and the voltage division protection circuit,
the optocoupler module further includes: a third resistor and a fourth resistor;
one end of the third resistor is connected with the first end of the photoelectric coupler;
one end of the fourth resistor is connected with the second end of the photoelectric coupler,
the control unit comprises an MCU;
the MCU is connected with the voltage division protection circuit.
2. The audio detection device of claim 1, wherein the first diode is a schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223381092.1U CN219248062U (en) | 2022-12-16 | 2022-12-16 | Audio detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223381092.1U CN219248062U (en) | 2022-12-16 | 2022-12-16 | Audio detection device |
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| Publication Number | Publication Date |
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| CN219248062U true CN219248062U (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223381092.1U Active CN219248062U (en) | 2022-12-16 | 2022-12-16 | Audio detection device |
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| CN (1) | CN219248062U (en) |
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