CN115379344A - Mute circuit and device of vehicle-mounted sound equipment and vehicle - Google Patents
Mute circuit and device of vehicle-mounted sound equipment and vehicle Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The application relates to the technical field of vehicles, in particular to silence circuit, device and vehicle of on-vehicle stereo set, wherein, the circuit includes: the sampling circuit is used for acquiring sampling voltage of a power supply of the vehicle-mounted sound equipment; a reference voltage circuit for generating a minimum reference voltage or a maximum reference voltage of the power supply; and the control component is used for judging that the power supply voltage of the power supply is abnormal when the sampling voltage is less than the minimum reference voltage or greater than the maximum reference voltage, generating a mute signal of the vehicle-mounted sound, and controlling the vehicle-mounted sound to enter a preset mute mode when the power supply voltage is abnormal by using the mute signal. Therefore, the problems that in the prior art, the mode that the MUTE pin of the power amplifier chip is controlled by the MCU output low level from the abnormal voltage value of the power supply is detected, the response time is long, when the voltage value exceeds the working voltage range of the power amplifier chip, the power amplifier chip cannot be controlled to be MUTE in time, the noise of the sound box cannot be effectively avoided completely, the driving experience is low and the like are solved.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a mute circuit and a mute device of a vehicle-mounted sound box and a vehicle.
Background
In the vehicle-mounted entertainment system, power amplifier chips for driving the sound equipment have the voltage range requirement of normal work: v min To V max 。V min Indicating the lowest working voltage, V, of the power amplifier chip max Representing the highest operating voltage of the chip. The power amplifier chip is powered by a vehicle body battery and a generator BATT At the moment of ignition, due to the increase of the power load of the vehicle body and the sudden start of the generator, the power supply supplies power to the power amplifier chipV BATT Generates abnormal fluctuation which is instantaneously less than V min Or greater than V max . The power supply voltage exceeds the working voltage range of the power amplifier chip, the power amplifier chip works abnormally, noise is generated on the sound box, and bad experience in hearing is brought to people.
In the related art, the vehicle machine detects V in an AD sampling mode using an MCU (micro controller Unit) BATT Voltage value of (a), specifically: firstly, the AD port of the MCU monitors V BATT When V is detected BATT＜ V min Or V BATT ＞V max When the sound box is used, the IO port of the MCU outputs low level, and then the MUTE pin of the power amplifier is pulled down, so that the sound box silencing function is realized. However, the related art power amplifier chip mutes the manner of detecting V from the MCU BATT The voltage AD value is abnormal, the response time of the MUTE pin of the MCU output low level control power amplifier chip is longer, and V is BATT When the voltage value exceeds the working voltage range of the power amplifier chip, the MCU cannot control the power amplifier chip to mute in time, and the problem of sound noise cannot be effectively avoided completely.
Disclosure of Invention
The application provides a silence circuit, device and vehicle of on-vehicle stereo set to solve correlation technique and adopt from MCU detection V BATT The voltage AD value is abnormal, and then the MCU outputs the mode of controlling the MUTE pin of the power amplifier chip by the low level, so that the response time is longer, and when the voltage value exceeds the working voltage range of the power amplifier chip, the MCU cannot timely control the power amplifier chip to be MUTE, the noise of the sound box cannot be completely and effectively avoided, the driving experience is low, and the like.
An embodiment of a first aspect of the present application provides a mute circuit of a car audio, including: the sampling circuit is used for acquiring sampling voltage of a power supply of the vehicle-mounted sound equipment; the reference voltage circuit is used for generating a preset minimum reference voltage or a preset maximum reference voltage of the power supply; and the control component is used for judging that the power supply voltage of the power supply is abnormal when the sampling voltage is smaller than the preset minimum reference voltage or larger than the preset maximum reference voltage, generating a mute signal of the vehicle-mounted sound, and controlling the vehicle-mounted sound to enter a preset mute mode when the power supply voltage is abnormal by using the mute signal.
According to the technical means, whether the voltage of the power supply is abnormal or not can be judged by comparing the sampling voltage of the power supply of the vehicle-mounted sound with the reference voltage of the power supply, when the voltage is not in the reference voltage range, abnormal fluctuation of the voltage can be judged, the power amplifier MUTE circuit is controlled by the vehicle-mounted voltage comparator to directly output the MUTE pin of the low-level control power amplifier chip, the MUTE function is realized, therefore, when the power supply voltage of the vehicle-mounted sound is abnormal, the control signal can be directly output to the vehicle-mounted sound without being processed by the MCU to realize MUTE control, the response time is shortened, the noise of the sound can be effectively avoided, and the driving experience of a user is further improved.
Optionally, in an embodiment of the present application, the control assembly includes: the inverting input end of the first comparator is connected with the first output end of the reference voltage circuit, the homodromous input end of the first comparator is connected with the output end of the sampling circuit, and the first comparator is used for outputting a first level signal when the sampling voltage is smaller than the preset minimum reference voltage, otherwise, outputting a second level signal, wherein the voltage corresponding to the first level signal is smaller than the voltage corresponding to the second level signal; and the reverse input end of the second comparator is connected with the second output end of the reference voltage circuit, the homodromous input end of the second comparator is connected with the output end of the sampling circuit, and the second comparator is used for outputting a third level signal when the sampling voltage is greater than the preset maximum reference voltage, otherwise, outputting a fourth level signal, wherein the voltage corresponding to the third level signal is less than the voltage corresponding to the fourth level signal.
According to the technical means, the control assembly of the embodiment of the application comprises two comparators which are used for outputting level signals and respectively realizing that the low-level MUTE control signal can be output to the MUTE pin of the power amplifier chip under the two conditions that the sampling voltage is less than the minimum reference voltage and the sampling voltage is greater than the maximum reference voltage.
Optionally, in an embodiment of the present application, the control assembly further includes: and the AND gate circuit is used for performing AND logic operation on the level signal output by the first comparator and the level signal output by the second comparator, outputting a logic operation result, and controlling the vehicle-mounted sound to be in a preset mute state when the power supply voltage is abnormal or controlling the vehicle-mounted sound to be in a preset power amplification state when the power supply voltage is normal by using the logic operation result.
According to the technical means, the logic operation can be performed on the level signals output by the two comparators by using the AND gate circuit, and the vehicle-mounted sound equipment is controlled to be in a preset mute or power amplification state according to the operation result.
Optionally, in an embodiment of the present application, the and gate circuit includes: the output end of the first diode is connected with the output end of the first comparator, and the output end of the second diode is connected with the output end of the second comparator; and one end of the first resistor is connected with a reference power supply of the reference circuit, and the other end of the first resistor is connected with the input ends of the first diode and the second diode.
According to the technical means, the first diode and the second diode of the embodiment of the application are respectively connected with the output end of the comparator and connected with the input end of the first resistor, and the resistors are utilized to play a role in voltage division, so that the protection effect on the diodes is realized, and the normal operation of the car machine is further ensured.
Optionally, in an embodiment of the present application, the reference voltage circuit includes: one end of the second resistor is connected with a reference power supply, the other end of the second resistor is connected with one end of the third resistor, and the other end of the third resistor is grounded, wherein the second resistor is used for generating a preset minimum reference voltage, and the third resistor is used for generating the preset maximum reference voltage; a first capacitor disposed in parallel with the third resistor.
According to the technical means, the second resistor is used for generating the minimum reference voltage, the third resistor is used for generating the maximum reference voltage, and the maximum reference voltage is compared with the power supply voltage to further judge the working state of the power amplifier chip.
Optionally, in an embodiment of the present application, the sampling circuit includes: the input end of the first voltage division circuit is connected with the power supply, and the output end of the first voltage division circuit is connected with the equidirectional input end of the first comparator; and the input end of the second voltage division circuit is connected with the power supply, and the output end of the second voltage division circuit is connected with the equidirectional input end of the second comparator.
According to the technical means, the voltage of the power supply can be sampled respectively by arranging the two voltage division circuits, so that the detection of low-voltage abnormity and high-voltage abnormity can be realized respectively, the reliability and accuracy of abnormity detection are improved, and the use experience of a user is improved.
Optionally, in an embodiment of the present application, the first voltage dividing circuit includes: one end of the fourth resistor is connected with the power supply, the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is grounded; and the second capacitor is connected with the fifth resistor in parallel.
According to the above technical means, the first voltage division circuit in the embodiment of the present application is that the power supply is divided by the resistors to generate the sampling voltage, and the sampling voltage is compared with the constant voltage value to further control the voltage comparator to output the corresponding level signal.
Optionally, in an embodiment of the present application, the second voltage dividing circuit includes: one end of the sixth resistor is connected with the power supply, the other end of the sixth resistor is connected with one end of the seventh resistor, and the other end of the seventh resistor is grounded; a third capacitor disposed in parallel with the seventh resistor.
According to the above technical means, in the second voltage division circuit of the embodiment of the present application, the power supply is divided by the resistors, so that the generated sampling voltage is compared with the constant voltage value, and the voltage comparator is further controlled to output a corresponding level signal.
An embodiment of a second aspect of the present application provides a muting device for a car audio, including: a power amplifier chip and a power supply of the vehicle-mounted sound equipment; the muting circuit of the vehicle-mounted sound equipment is used for acquiring sampling voltage of a power supply of the vehicle-mounted sound equipment, judging that the power supply voltage of the power supply is abnormal when the sampling voltage is smaller than the preset minimum reference voltage or the preset maximum reference voltage, generating a muting signal of the vehicle-mounted sound equipment, and sending the muting signal to a power amplifier chip, so that the power amplifier chip controls the vehicle-mounted sound equipment to enter a preset muting mode when the power supply voltage is abnormal by utilizing the muting signal.
An embodiment of a third aspect of the present application provides a vehicle, comprising: vehicle-mounted sound equipment; the muting device of the vehicle-mounted sound according to the embodiment is used for acquiring the sampling voltage of the power supply of the vehicle-mounted sound, judging that the power supply voltage of the power supply is abnormal when the sampling voltage is smaller than the preset minimum reference voltage or the preset maximum reference voltage, generating the muting signal of the vehicle-mounted sound, and controlling the vehicle-mounted sound to enter the preset muting mode when the power supply voltage is abnormal by using the muting signal.
Therefore, the application has at least the following beneficial effects:
1. the embodiment of the application can judge whether the voltage of the power supply is abnormal or not by comparing the sampling voltage of the power supply of the vehicle-mounted sound with the reference voltage of the power supply, when the voltage is not in the reference voltage range, the abnormal fluctuation of the voltage can be judged, and the power amplifier MUTE circuit is controlled by the vehicle-mounted voltage comparator to directly output a low-level control power amplifier chip MUTE pin, so that the MUTE function is realized, thereby the MUTE control can be realized by directly outputting a control signal to the vehicle-mounted sound without MCU processing when the power supply voltage of the vehicle-mounted sound is abnormal, the response time is shortened, the noise of the sound can be effectively avoided, and the driving experience of a user is further improved.
2. The control assembly of the embodiment of the application comprises two comparators for outputting level signals, and respectively realizing that low-level MUTE control signals can be output to the MUTE pin of the power amplifier chip under the two conditions that the sampling voltage is less than the minimum reference voltage and the sampling voltage is greater than the maximum reference voltage.
3. According to the embodiment of the application, the AND gate circuit can be used for carrying out logic operation on the level signals output by the two comparators, and the vehicle-mounted sound equipment is controlled to be in a preset mute or power amplification state according to the operation result.
4. The first diode and the second diode of this application embodiment are connected with the output of comparator respectively to be connected with the input of first resistance, utilize resistance to play the partial pressure effect, thereby realize the guard action to the diode, further guarantee the normal operating of car machine work.
5. The second resistor is used for generating the minimum reference voltage, the third resistor is used for generating the maximum reference voltage, and the maximum reference voltage is compared with the power supply voltage to further judge the working state of the power amplifier chip.
6. The embodiment of the application can sample the voltage of the power supply respectively by setting the two voltage division circuits to realize the detection of low-voltage abnormity and high-voltage abnormity respectively, improve the reliability and accuracy of abnormity detection and improve the use experience of users.
7. The first voltage division circuit of the embodiment of the application is that a power supply is divided by a resistor, so that a sampling voltage is generated, and the sampling voltage is compared with a constant voltage value to further control a voltage comparator to output a corresponding level signal.
8. The second voltage division circuit of the embodiment of the application is that a power supply is divided by resistors so as to generate sampling voltage, and the sampling voltage is compared with a constant voltage value to further control the voltage comparator to output a corresponding level signal.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram illustrating a mute circuit of a car audio according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a mute circuit for controlling a power amplifier by a vehicle-mounted voltage comparator according to an embodiment of the present application;
FIG. 3 is a block diagram of a mute circuit for controlling a power amplifier by a vehicle-mounted voltage comparator of a vehicle-mounted entertainment system according to an embodiment of the present application;
fig. 4 is a block diagram illustrating a mute apparatus for a car audio according to an embodiment of the present application.
Description of the reference numerals: the device comprises a sampling circuit-100-, a reference voltage circuit-200-, a control component 300, a power amplifier chip-400 of the vehicle-mounted sound, a power supply-500 and a mute circuit-600 of the vehicle-mounted sound.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.
The following describes a muting circuit, a muting device, and a vehicle of a car audio according to an embodiment of the present application with reference to the drawings. In the circuit, whether the voltage of the power supply is abnormal or not is judged by comparing the sampling voltage of the power supply of the vehicle-mounted sound with the reference voltage of the power supply, and when the voltage is not in the range of the reference voltage, abnormal fluctuation of the voltage can be judged, and the vehicle-mounted voltage comparator controls the power amplifier MUTE circuit to directly output a low-level control power amplifier chip MUTE pin, so that the MUTE function is realized.
Therefore, the problems that in the prior art, the mode that the MUTE pin of the power amplifier chip is controlled by the MCU output low level from the abnormal voltage value of the power supply is detected, the response time is long, when the voltage value exceeds the working voltage range of the power amplifier chip, the power amplifier chip cannot be controlled to be MUTE in time, the noise of the sound box cannot be effectively avoided completely, the driving experience is low and the like are solved.
Specifically, fig. 1 is a block schematic diagram of a mute circuit of a car audio according to an embodiment of the present application.
As shown in fig. 1, the muting circuit of the car audio includes: a sampling circuit 100, a reference voltage circuit 200, and a control component 300.
The sampling circuit 100 is used for acquiring a sampling voltage of a power supply of the vehicle-mounted sound; a reference voltage circuit 200 for generating a preset minimum reference voltage or a preset maximum reference voltage of the power supply; and the control component 300 is configured to determine that the power supply voltage of the power supply is abnormal when the sampling voltage is less than a preset minimum reference voltage or greater than a preset maximum reference voltage, generate a mute signal of the car audio, and control the car audio to enter a preset mute mode when the power supply voltage is abnormal by using the mute signal.
In one embodiment of the present application, the reference voltage circuit 200 includes: one end of the second resistor is connected with a reference power supply, the other end of the second resistor is connected with one end of the third resistor, and the other end of the third resistor is grounded, wherein the second resistor is used for generating a preset minimum reference voltage, and the third resistor is used for generating a preset maximum reference voltage; and the first capacitor is connected with the third resistor in parallel.
As shown in fig. 2, VCC is a reference power source in the vehicle, is a constant voltage value, is connected to pin 8 of the voltage comparator U1, supplies power to the voltage comparator U1, and pin 4 of the voltage comparator U1 is connected to ground. VCC is divided by the second resistor R1 and the third resistor R2 to generate a voltage V TH ，V TH Also a constant voltage value. Specifically, one end of the second resistor R1 is connected to the reference power source VCC, the other end is connected to the third resistor R2, the other end of the third resistor R2 is grounded, and the first resistor R1 is connected to the groundThe capacitor C1 and the third resistor R2 are arranged in parallel. Wherein, the second resistor R1 is used for generating the lowest working voltage V of the power amplifier chip min The third resistor R2 is used for generating the highest working voltage V of the power amplifier chip max 。
In one embodiment of the present application, the sampling circuit 100 includes: and the input end of the first voltage division circuit is connected with a power supply, and the output end of the first voltage division circuit is connected with the same-direction input end of the first comparator. And the input end of the second voltage division circuit is connected with the power supply, and the output end of the second voltage division circuit is connected with the homodromous input end of the second comparator.
As shown in FIG. 2, V BATT Supply voltage for the vehicle body, input of the first voltage divider circuit and the supply voltage source V BATT And the output end of the first comparator U1 is connected with the 3 rd pin (the same-direction input end of the first comparator) of the first comparator U1. Input end of second voltage division circuit and power supply V BATT And the 5 th pin (the same-direction input end of the second comparator) of the second comparator U1 at the output end is connected.
In one embodiment of the present application, the first voltage dividing circuit includes: one end of the fourth resistor is connected with a power supply, the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is grounded; and the second capacitor is connected with the fifth resistor in parallel.
As shown in FIG. 2, the first voltage dividing circuit of the embodiment of the present application is a power supply V BATT The voltage is divided by a fourth resistor R3 and a fifth resistor R4, so that a sampling voltage V is generated HIGH . Wherein, one end of the fourth resistor R3 is connected with the power supply V BATT The other end of the third capacitor C2 is connected with one end of a fifth resistor R4, the other end of the fifth resistor R4 is grounded, and the second capacitor C2 is connected with the fifth resistor R4 in parallel.
In one embodiment of the present application, the second voltage dividing circuit includes: one end of the sixth resistor is connected with the power supply, the other end of the sixth resistor is connected with one end of the seventh resistor, and the other end of the seventh resistor is grounded; and the third capacitor is connected with the seventh resistor in parallel.
As shown in FIG. 2, the second voltage dividing circuit of the embodiment of the present application is a power supply V BATT The voltage is divided by a sixth resistor R5 and a seventh resistor R6, so that the generated sampling voltage is V LOW . One end of the sixth resistor R5 is connected with the power supply VBATT, the other end of the sixth resistor R5 is connected with one end of the seventh resistor R6, the other end of the seventh resistor R6 is grounded, and the third capacitor C3 is connected with the seventh resistor R6 in parallel.
In one embodiment of the present application, the control assembly 300 includes: the reverse input end of the first comparator is connected with the first output end of the reference voltage circuit, the homodromous input end of the first comparator is connected with the output end of the sampling circuit, and the first comparator is used for outputting a first level signal when the sampling voltage is smaller than a preset minimum reference voltage, otherwise, outputting a second level signal, wherein the voltage corresponding to the first level signal is smaller than the voltage corresponding to the second level signal; and the reverse input end of the second comparator is connected with the second output end of the reference voltage circuit, the homodromous input end of the second comparator is connected with the output end of the sampling circuit, and the second comparator is used for outputting a third level signal when the sampling voltage is greater than the preset maximum reference voltage, otherwise, outputting a fourth level signal, wherein the voltage corresponding to the third level signal is less than the voltage corresponding to the fourth level signal.
In the embodiment of the present application, the first level signal and the third level signal are at a low level, and the second level signal and the fourth level signal are at a high level.
As shown in fig. 2, the inverting input terminal (pin 2 of U1) of the first comparator of the embodiment of the present application is connected to the first output terminal of the reference voltage circuit 200, and the non-inverting input terminal (pin 3 of U1) of the first comparator is connected to the output terminal of the sampling circuit. The inverting input terminal (pin 6 of U1) of the second comparator is connected to the second output terminal of the reference voltage circuit, and the non-inverting input terminal (pin 5 of U1) of the second comparator is connected to the output terminal of the sampling circuit.
Specifically, after the VCC reference power supply is divided by resistors R1 and R2, the generated voltage is V TH ，V TH Also at a constant voltage value.
In the first comparator, V TH Is connected to pin 2 of the voltage comparator U1 (first comparator inverting input terminal). V TH Is the comparison threshold of comparator 1. V BATT Supply voltage, V, for the vehicle body BATT The sampling voltage generated after voltage division by the resistors R5 and R6 is V LOW ，V LOW Is connected to pin 3 of the voltage comparator U1 (the same-direction input terminal of the comparator 1). The values of the resistors R5 and R6 satisfy the following formula: v TH ＝(V min *R6)/(R5+R6)，V min The lowest working voltage of the power amplifier chip is obtained; and V LOW＝ (V BATT* R6)/(R5+R6)。
When V is BATT ＜V min When, V LOW ＜V TH The 1 st pin (the output end of the first comparator) of the voltage comparator U1 outputs low level; when V is BATT ＞V min When, V LOW＞ V TH And the 1 st pin (the output end of the first comparator) of the voltage comparator U1 outputs a high level.
In the second comparator, V TH And also to pin 5 of the voltage comparator U1 (the second comparator common-direction input). V TH Is the comparison threshold of the second comparator. V BATT Supply voltage, V, for the vehicle body BATT The sampling voltage generated after voltage division by the resistors R3 and R4 is V HIGH ，V HIGH Is connected to pin 6 of the voltage comparator U1 (inverting input of the comparator 2). The values of the resistors R3 and R4 satisfy the following formula: v TH ＝(V max *R4)/(R3+R4)，V max The maximum working voltage of the power amplifier chip; and V HIGH＝ (V BATT* R4)/(R3+R4)。
When V is BATT ＞V max When, V HIGH ＞V TH The 7 th pin (the output end of the second comparator) of the voltage comparator U1 outputs a low level; when V is BATT ＜V max When, V HIGH ＜V TH And the 7 th pin (the output end of the second comparator) of the voltage comparator U1 outputs high level.
In some cases, the MUTE terminal is low when one of the 1 st pin and the 7 th pin of the voltage comparator U1 has a low output. The MUTE end is connected to the MUTE pin of the power amplifier chip, whenV BATT ＜V min Or V BATT ＞V max， And when the vehicle-mounted voltage comparator controls the power amplifier MUTE circuit to control the MUTE pin of the power amplifier chip to be low, so that the MUTE function of the sound box is realized.
In one embodiment of the present application, the control assembly 300 further comprises: and the AND gate circuit is used for carrying out AND logic operation on the level signal output by the first comparator and the level signal output by the second comparator, outputting a logic operation result, and controlling the vehicle-mounted sound equipment to be in a preset mute state when the power supply voltage is abnormal or controlling the vehicle-mounted sound equipment to be in a preset power amplification state when the power supply voltage is normal by using the logic operation result.
It can be understood that, in the embodiment of the present application, the and gate circuit may be used to perform logical operation on the level signals output by the two comparators, and the vehicle-mounted audio is controlled to be in the preset mute state or the power amplification state according to the operation result. As shown in fig. 3, when the power supply voltage V of the power amplifier chip is high BATT At V min To V max， In the normal working voltage range, the vehicle-mounted voltage comparator controls the output of the power amplifier mute circuit to be high level, the sound mute function of the vehicle-mounted entertainment system in each mode is controlled by the IO port of the MCU, and when V is within the normal working voltage range, the sound mute function is controlled by the IO port of the MCU BATT＜ V min Or V BATT ＞V max When the vehicle-mounted entertainment system is used, the vehicle-mounted voltage comparator controls the output of the power amplifier mute circuit to be low level, and the sound box mute function of the vehicle-mounted entertainment system is controlled by the vehicle-mounted voltage comparator controlling the power amplifier mute circuit, so that the mute function is realized, the sound box noise is effectively avoided, and the driving experience of a user is further improved.
In one embodiment of the present application, an and gate circuit includes: the output end of the first diode is connected with the output end of the first comparator, and the output end of the second diode is connected with the output end of the second comparator; and one end of the first resistor is connected with a reference power supply of the reference circuit, and the other end of the first resistor is connected with the input ends of the first diode and the second diode.
As shown in fig. 2, the and circuit of the embodiment of the present application includes a first diode D1, a second diode D2, and a first resistor R7. One end of the first resistor R7 is connected to a reference power VCC of the reference circuit 200, and the other end is connected to input ends of the first diode D1 and the second diode D2; the output terminal of the first diode D1 is connected to the output terminal OUT1 of the first comparator. The output terminal of the second diode D2 is connected to the output terminal OUT2 of the first comparator.
According to the muting circuit of the vehicle-mounted sound, whether the power supply voltage of the power supply is abnormal or not is judged by comparing the sampling voltage of the power supply of the vehicle-mounted sound with the reference voltage of the power supply, when the sampling voltage is not within the reference voltage range, the voltage can be judged to be abnormally fluctuated, the vehicle-mounted voltage comparator controls the power amplifier muting circuit to directly output the low-level control power amplifier chip MUTE pin, the muting function is achieved, therefore, when the power supply voltage of the vehicle-mounted sound is abnormal, a control signal can be directly output to the vehicle-mounted sound without being processed by the MCU to achieve muting control, the response time is shortened, the noise of the sound can be effectively avoided, and the driving experience of a user is further improved. Therefore, the problems that in the prior art, the mode that the MUTE pin of the power amplifier chip is controlled by the MCU after the abnormal voltage value of the power supply is detected is adopted, the response time is long, when the voltage value exceeds the working voltage range of the power amplifier chip, the MCU cannot control the power amplifier chip to MUTE in time, the noise of the sound box cannot be effectively avoided completely, and the driving experience is low are solved.
Next, a muting device for a car audio proposed according to an embodiment of the present application is described with reference to the drawings.
Fig. 4 is a block diagram illustrating a mute apparatus for a car audio according to an embodiment of the present invention.
As shown in fig. 4, the muting device 20 for a car audio includes: the power amplifier chip 400 of the car audio, the power supply 500 and the mute circuit 600 of the car audio.
The muting circuit 600 of the car-mounted sound is configured to obtain a sampling voltage of the power supply 500 of the car-mounted sound, determine that the power supply voltage of the power supply is abnormal when the sampling voltage is smaller than a preset minimum reference voltage or a preset maximum reference voltage, generate a muting signal of the car-mounted sound, and send the muting signal to the power amplifier chip 400, so that the power amplifier chip controls the car-mounted sound to enter a preset muting mode when the power supply voltage is abnormal by using the muting signal.
It should be noted that the foregoing explanation of the embodiment of the muting device for a car audio is also applicable to the muting device for a car audio of this embodiment, and details thereof are not repeated here.
According to the muting device of the vehicle-mounted sound equipment provided by the embodiment of the application, through comparing the sampling voltage of the power supply of the vehicle-mounted sound equipment with the reference voltage of the power supply, whether the power supply voltage of the power supply is abnormal or not is judged, when the sampling voltage is not within the reference voltage range, the abnormal fluctuation of the voltage can be judged, and the power amplifier muting circuit is controlled by the vehicle-mounted voltage comparator to directly output the low-level control power amplifier chip MUTE pin, so that the muting function is realized, so that the control signal can be directly output to the vehicle-mounted sound equipment to realize muting control without being processed by the MCU (microprogrammed control unit) when the power supply voltage of the vehicle-mounted sound equipment is abnormal, the response time is shortened, the noise of the sound equipment can be effectively avoided, and the driving experience of a user is further improved. Therefore, the problems that in the prior art, the mode that the voltage value of the power supply is detected to be abnormal and then the MCU outputs the MUTE pin of the low-level control power amplifier chip is adopted, the response time is long, when the voltage value exceeds the working voltage range of the power amplifier chip, the MCU cannot control the MUTE of the power amplifier chip in time, the noise of a sound box cannot be avoided completely and effectively, and the driving experience is low are solved.
In addition, this application embodiment still provides a vehicle, wherein, the vehicle includes: vehicle-mounted audio and a muting device for vehicle-mounted audio.
The muting device of the vehicle-mounted sound is used for acquiring sampling voltage of a power supply of the vehicle-mounted sound, judging that the power supply voltage of the power supply is abnormal when the sampling voltage is smaller than a preset minimum reference voltage or a preset maximum reference voltage, generating a muting signal of the vehicle-mounted sound, and controlling the vehicle-mounted sound to enter a preset muting mode when the power supply voltage is abnormal by using the muting signal.
According to the vehicle provided by the embodiment of the application, the vehicle is provided with the vehicle-mounted sound mute device of the embodiment, so that when the power supply voltage of the vehicle-mounted sound is abnormal, the control signal can be directly output to the vehicle-mounted sound without being processed by the MCU to realize mute control, the response time is shortened, the sound noise can be effectively avoided, and the driving experience of a user is further improved. Therefore, the problems that in the prior art, the mode that the MUTE pin of the power amplifier chip is controlled by the MCU after the abnormal voltage value of the power supply is detected is adopted, the response time is long, when the voltage value exceeds the working voltage range of the power amplifier chip, the MCU cannot control the power amplifier chip to MUTE in time, the noise of the sound box cannot be effectively avoided completely, and the driving experience is low are solved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a programmable gate array, a field programmable gate array, or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A mute circuit of a car audio, comprising:
the sampling circuit is used for acquiring sampling voltage of a power supply of the vehicle-mounted sound equipment;
the reference voltage circuit is used for generating a preset minimum reference voltage or a preset maximum reference voltage of the power supply;
and the control component is used for judging that the power supply voltage of the power supply is abnormal when the sampling voltage is less than the preset minimum reference voltage or the preset maximum reference voltage, generating a mute signal of the vehicle-mounted sound, and controlling the vehicle-mounted sound to enter a preset mute mode when the power supply voltage is abnormal by using the mute signal.
2. The circuit of claim 1, wherein the control component comprises:
the inverting input end of the first comparator is connected with the first output end of the reference voltage circuit, the homodromous input end of the first comparator is connected with the output end of the sampling circuit, and the first comparator is used for outputting a first level signal when the sampling voltage is smaller than the preset minimum reference voltage, otherwise, outputting a second level signal, wherein the voltage corresponding to the first level signal is smaller than the voltage corresponding to the second level signal;
and the backward input end of the second comparator is connected with the second output end of the reference voltage circuit, the equidirectional input end of the second comparator is connected with the output end of the sampling circuit, and the second comparator is used for outputting a third level signal when the sampling voltage is greater than the preset maximum reference voltage, otherwise, outputting a fourth level signal, wherein the voltage corresponding to the third level signal is less than the voltage corresponding to the fourth level signal.
3. The circuit of claim 2, wherein the control component further comprises:
and the AND gate circuit is used for performing AND logic operation on the level signal output by the first comparator and the level signal output by the second comparator, outputting a logic operation result, and controlling the vehicle-mounted sound to be in a preset mute state when the power supply voltage is abnormal or controlling the vehicle-mounted sound to be in a preset power amplification state when the power supply voltage is normal by using the logic operation result.
4. The circuit of claim 3, wherein the AND circuit comprises:
the output end of the first diode is connected with the output end of the first comparator, and the output end of the second diode is connected with the output end of the second comparator;
and one end of the first resistor is connected with a reference power supply of the reference circuit, and the other end of the first resistor is connected with the input ends of the first diode and the second diode.
5. The circuit of claim 1, wherein the reference voltage circuit comprises:
one end of the second resistor is connected with a reference power supply, the other end of the second resistor is connected with one end of the third resistor, and the other end of the third resistor is grounded, wherein the second resistor is used for generating a preset minimum reference voltage, and the third resistor is used for generating the preset maximum reference voltage;
a first capacitor disposed in parallel with the third resistor.
6. The circuit of claim 2, wherein the sampling circuit comprises:
the input end of the first voltage division circuit is connected with the power supply, and the output end of the first voltage division circuit is connected with the equidirectional input end of the first comparator;
and the input end of the second voltage division circuit is connected with the power supply, and the output end of the second voltage division circuit is connected with the equidirectional input end of the second comparator.
7. The circuit of claim 6, wherein the first voltage divider circuit comprises:
one end of the fourth resistor is connected with the power supply, the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is grounded;
and the second capacitor is connected with the fifth resistor in parallel.
8. The circuit of claim 6, wherein the second voltage divider circuit comprises:
one end of the sixth resistor is connected with the power supply, the other end of the sixth resistor is connected with one end of the seventh resistor, and the other end of the seventh resistor is grounded;
a third capacitor disposed in parallel with the seventh resistor.
9. A muting device for a car audio, comprising:
a power amplifier chip and a power supply of the vehicle-mounted sound equipment;
the muting circuit of the car audio according to any one of claims 1-6, configured to obtain a sampling voltage of a power supply of the car audio, determine that the power supply voltage of the power supply is abnormal when the sampling voltage is smaller than the preset minimum reference voltage or the preset maximum reference voltage, generate a muting signal of the car audio, and send the muting signal to a power amplifier chip, so that the power amplifier chip controls the car audio to enter a preset muting mode when the power supply voltage is abnormal by using the muting signal.
10. A vehicle, characterized by comprising:
vehicle-mounted sound equipment;
a muting device for a car audio according to claim 9, configured to obtain a sampling voltage of a power supply of the car audio, determine that the power supply voltage of the power supply is abnormal when the sampling voltage is smaller than the preset minimum reference voltage or the preset maximum reference voltage, generate a muting signal for the car audio, and control the car audio to enter a preset muting mode when the power supply voltage is abnormal by using the muting signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211117603.0A CN115379344A (en) | 2022-09-14 | 2022-09-14 | Mute circuit and device of vehicle-mounted sound equipment and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211117603.0A CN115379344A (en) | 2022-09-14 | 2022-09-14 | Mute circuit and device of vehicle-mounted sound equipment and vehicle |
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| CN115379344A true CN115379344A (en) | 2022-11-22 |
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Application publication date: 20221122 |