CN217088099U - Audio signal processing circuit and vehicle navigation equipment - Google Patents
Audio signal processing circuit and vehicle navigation equipment Download PDFInfo
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- CN217088099U CN217088099U CN202220886530.0U CN202220886530U CN217088099U CN 217088099 U CN217088099 U CN 217088099U CN 202220886530 U CN202220886530 U CN 202220886530U CN 217088099 U CN217088099 U CN 217088099U
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Abstract
The application discloses an audio signal processing circuit and a vehicle-mounted navigation device, wherein the audio signal processing circuit comprises a navigation voice acquisition module for acquiring and outputting a navigation voice signal of the vehicle-mounted navigation device; the power amplification module is coupled with the navigation voice acquisition module and used for adjusting the amplification factor of the received signal and outputting the signal; the navigation voice broadcasting module is coupled with the power amplification module and used for converting the received navigation voice signal into a sound signal to be output; the call state detection module is used for detecting the state of the voice call function of the vehicle-mounted navigation equipment so as to send out a voice call activation signal when the voice call function is detected to be activated; a switch module coupled to the call state detection module for sending a switch signal when receiving the voice call activation signal; the execution module is coupled with the switch module and is connected in series in the power amplification module to change the amplification factor; the method and the device have the effect of improving the use experience of the voice call function of the vehicle-mounted navigation equipment.
Description
Technical Field
The application relates to the technical field of vehicle navigation audio control, in particular to an audio signal processing circuit and vehicle navigation equipment.
Background
At present, in order to facilitate a driver to plan a path when driving a vehicle, vehicle-mounted navigation equipment is generally installed on the vehicle, and the vehicle-mounted navigation equipment in the current market generally has a function of broadcasting navigation information by voice so as to broadcast the navigation information by voice without lowering the head of the driver to check a navigation screen, so that the safety when using the vehicle-mounted navigation equipment is improved; many car navigation devices on the market today have a voice call function, or use the voice call function on the mobile terminal through bluetooth connection, so that the driver can conveniently answer the call.
When a driver uses a voice call function, the existing vehicle-mounted navigation equipment supporting the voice call function cannot easily hear the voice call content of the driver on one hand and cannot easily hear the voice call content of the other party participating in the voice call on the other hand because the broadcasting sound of the navigation information is mixed with the voice call sound.
In view of the above-described related art, the inventors considered that when the voice broadcast navigation information function and the voice call function of the car navigation apparatus are used simultaneously, there was a problem in that it is difficult for the driver to hear the voice call content.
SUMMERY OF THE UTILITY MODEL
In order to improve the use experience of the voice call function of the vehicle-mounted navigation equipment, the application provides an audio signal processing circuit and the vehicle-mounted navigation equipment.
The audio signal processing circuit and the vehicle-mounted navigation equipment adopt the following technical scheme:
an audio signal processing circuit is used for controlling the volume of navigation information broadcast and comprises a navigation voice acquisition module, a power amplifier module, a navigation voice broadcast module, a call state detection module, a switch module and an execution module; wherein:
the navigation voice acquisition module is used for acquiring and outputting a navigation voice signal of the vehicle-mounted navigation equipment;
the power amplification module is coupled with the navigation voice acquisition module and used for adjusting the amplification ratio of the received signal and outputting the signal;
the navigation voice broadcasting module is coupled with the power amplification module and used for converting the received navigation voice signal into a sound signal to be output;
the communication state detection module is used for detecting the state of the voice communication function of the vehicle-mounted navigation equipment so as to send out a voice communication activation signal when the voice communication function is detected to be activated;
the switch module is coupled with the call state detection module and used for sending out a switch signal when receiving the voice call activation signal;
and the execution module is coupled with the switch module and is connected in series in the power amplification module so as to change the amplification factor.
By adopting the technical scheme, when a driver does not use the voice call function, the audio signal processing circuit is used for controlling the volume of navigation information broadcast, wherein the navigation voice acquisition module acquires navigation voice signals in the vehicle-mounted navigation equipment and outputs the navigation voice signals to the power amplification module, the power amplification module adjusts the amplification ratio of the received navigation voice signals and outputs the navigation voice signals with the adjusted amplification ratio to the navigation voice broadcast module, and the navigation voice broadcast module converts the received navigation voice signals with the adjusted amplification ratio into sound signals to be output so as to transmit the navigation information to the driver through sound, so that the driver drives according to a navigation route under the condition of not watching the vehicle-mounted navigation equipment; when a driver uses the voice call function, the call state detection module detects the activation of the voice call function, generates a voice call activation signal and sends the voice call activation signal to the switch module, and the switch module generates a switch signal and sends the switch signal to the execution module when receiving the voice call activation signal so as to control the power amplification module to change the amplification power, reduce the volume of navigation information broadcast and facilitate the driver to clearly hear the voice call content.
Optionally, the navigation voice acquisition module comprises a voice acquisition chip for acquiring navigation voice signals and outputting the navigation voice signals in the vehicle-mounted navigation equipment, the voice acquisition chip is connected in series with the power supply loop, and a signal output end of the voice acquisition chip is connected to the power amplifier module.
Through adopting above-mentioned technical scheme, navigation voice collection module includes the sound collection chip for gather navigation voice signal among the vehicle navigation equipment, the sound collection chip is established ties in power supply loop in order to acquire the electric energy, and the signal output part of sound collection chip connects in power amplifier module, in order to with navigation voice signal output to power amplifier module, is convenient for follow-up carry out the magnification to navigation voice signal and adjusts.
Optionally, the power amplifier module includes a first resistor R1, a second resistor R2, a first triode Q1, a third resistor R3, and a magnification selection module for changing the magnification of the power amplifier module by controlling the change of the resistance value; one end of the first resistor R1 is connected to a power supply voltage VCC, the other end of the first resistor R1 is connected to the ground after being connected in series with the second resistor R2, the connecting nodes of the first resistor R1 and the second resistor R2 are respectively connected to the signal output end of the sound acquisition chip and the base of the first triode Q1, the emitter of the first triode Q1 is connected to the ground after being connected in series with the third resistor R3, the collector of the first triode Q1 is connected to the power supply voltage VCC after being connected in series with the multiplying power selection module, and the connecting nodes of the first triode Q1 and the multiplying power selection module are connected to the navigation voice broadcast module.
By adopting the technical scheme, the power amplification module comprises a first resistor R1 and a second resistor R2, and is used for dividing voltage when the first triode Q1 is not conducted so as to protect a circuit, the amplification factor of the power amplification module is determined by the first resistor R1, the second resistor R2, the third resistor R3 and the resistance value of the magnification selection module, when the resistance value of the magnification selection module is larger, the amplification factor of the power amplification module is larger, so that the effect of changing the amplification factor of the power amplification module is achieved by changing the resistance value of the magnification selection module, wherein the amplification factor refers to the ratio of the signal intensity output by the collector of the first triode Q1 to the signal intensity input by the base of the first triode Q1.
Optionally, the magnification selection module includes a magnification selection switch KM1-1, a fourth resistor R4, and a fifth resistor R5, the magnification selection switch KM1-1 is a single-pole double-throw switch, a moving end of the magnification selection switch KM1-1 is connected to a power supply voltage VCC, a first stationary end of the magnification selection switch KM1-1 and the fourth resistor R4 are connected in series and then connected to a collector of the first triode Q1, a second stationary end of the magnification selection switch KM1-1 and the fifth resistor R5 are connected in series and then connected to a collector of the first triode Q1, and an initial position of the moving end of the magnification selection switch KM1-1 is connected to the first stationary end.
By adopting the technical scheme, the magnification selection switch KM1-1 is a single-pole double-throw switch, so that the function of switching the amplification magnification of the power amplification module can be achieved by changing the connection position of the movable end; the movable end of the multiplying power selection switch KM1-1 is connected to a power supply voltage VCC, the first fixed end of the multiplying power selection switch KM1-1 is connected with the collector of a first triode Q1 after being connected with a fourth resistor R4 in series, and the second fixed end of the multiplying power selection switch KM1-1 is connected with the collector of the first triode Q1 after being connected with a fifth resistor R5 in series, so that the effect of selectively connecting the fourth resistor R4 or the fifth resistor R5 can be achieved by changing the connection position of the movable end of the multiplying power selection switch KM1-1, and the resistance value of the multiplying power selection module is further changed; the initial position of the movable end of the magnification selection switch KM1-1 is connected to the first stationary end, i.e. the initial magnification of the power amplifier module is determined by the fourth resistor R4.
Optionally, the execution module includes a first relay KM1, one end of a coil of the first relay KM1 is connected to the switch module, and the other end is grounded, and the first relay KM1 includes a multiplying factor selecting switch KM 1-1.
By adopting the technical scheme, the execution module comprises a first relay KM1, the first relay KM1 comprises a multiplying power selection switch KM1-1, when the first relay KM1 receives a switching signal, the first relay KM1 sends out an execution signal to enable a movable end of the multiplying power selection switch KM1-1 to move from a first fixed end to a second fixed end, and the resistance value of the multiplying power selection module is switched from the resistance value determined by a fourth resistor R4 to the resistance value determined by a fifth resistor R5; when the first relay KM1 does not receive a switch signal, the movable end of the multiplying power selection switch KM1-1 is connected to the first fixed end, and the resistance value of the multiplying power selection module is determined by the resistance value of the fourth resistor R4; the connecting position of the movable end of the multiplying power selection switch KM1-1 is controlled according to different received signals, so that the effect of automatically controlling the resistance value of the multiplying power selection module is achieved.
Optionally, the fourth resistor R4 is an adjustable resistor, and the fifth resistor R5 is an adjustable resistor.
Through adopting above-mentioned technical scheme, fourth resistor R4 and fifth resistor R5 are adjustable resistance for the multiplying power selection module has still increased the function of user's manual regulation resistance value on the basis of automatic switch resistance value, and the volume of the manual adjustment navigation information of user when non-voice call state or voice call state of being convenient for is reported has further improved user experience.
Optionally, the navigation voice broadcast module includes a speaker, the signal input end of the speaker is connected to the connection node of the first triode Q1 and the magnification selection module, and the other end of the speaker is grounded.
Through adopting above-mentioned technical scheme, the navigation voice broadcast module includes the speaker for through the form broadcast navigation voice message of sound signal, the signal input part of speaker is connected in the connected node of first triode Q1 and multiplying power selection module, other end ground connection, so that broadcast the navigation voice signal after will enlarging through the power amplifier module.
Optionally, the call state detection module includes a state detection sensor for detecting a voice call function state of the car navigation device, the state detection sensor is connected in series to the power supply loop, and a signal output end of the state detection sensor is connected to the switch module through a sixth resistor R6.
By adopting the technical scheme, the state detection sensor is connected in series with the power supply loop to obtain power supply, the voice call function state of the vehicle-mounted navigation equipment is detected through the state detection sensor, and when a user uses the voice call function, the state detection sensor generates a voice call activation signal and sends the voice call activation signal to the switch module.
Optionally, the audio signal processing circuit further includes: first filtering module and second filtering module, first filtering module includes first filtering electric capacity C1, the signal output part in the sound collection chip is connected to the one end of first filtering electric capacity C1, and the other end is connected in the connected node of first resistor R1 and second resistor R2, second filtering module includes second filtering electric capacity C2, the one end of second filtering electric capacity C2 connect in the connected node of first triode Q1 and multiplying power selection module, the other end connect in the signal input part of speaker.
By adopting the above technical scheme, the audio signal processing circuit further comprises: first filtering module and second filtering module, first filtering module and second filtering module constitute by the condenser, wherein first filtering module sets up between navigation voice acquisition module and power amplifier module, be used for filtering initial voice navigation signal, in order to eliminate the noise, second filtering module sets up between power amplifier module and navigation voice broadcast module, be used for filtering the voice navigation signal after power amplifier module enlargies, in order to eliminate the noise once more, carry out the elimination of noise through two-stage filtering, in order to improve the tone quality that navigation information reported, improve user experience.
Optionally, the car navigation device includes a speaker for broadcasting navigation information in voice, and the audio signal processing circuit is coupled to the speaker.
By adopting the technical scheme, the loudspeaker of the vehicle navigation equipment is coupled with any one of the audio signal processing circuits, so that the function of adjusting the volume of the navigation information broadcast when a driver carries out voice call can be conveniently realized, and the user experience of the vehicle navigation equipment is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when a driver does not use the voice call function, the audio signal processing circuit is used for controlling the volume of navigation information broadcast, wherein the navigation voice acquisition module acquires navigation voice signals in the vehicle-mounted navigation equipment and outputs the navigation voice signals to the power amplification module, the power amplification module performs amplification factor adjustment on the received navigation voice signals and outputs the navigation voice signals after the amplification factor adjustment to the navigation voice broadcast module, and the navigation voice broadcast module converts the received navigation voice signals after the amplification adjustment into sound signals to be output so as to transmit the navigation information to the driver through sound, so that the driver can drive according to a navigation route without watching the vehicle-mounted navigation equipment; when a driver uses the voice call function, the call state detection module detects the activation of the voice call function, generates a voice call activation signal and sends the voice call activation signal to the switch module, and the switch module generates a switch signal and sends the switch signal to the execution module when receiving the voice call activation signal so as to control the power amplification module to change the amplification power, reduce the volume of navigation information broadcast and facilitate the driver to clearly hear the voice call content.
2. The power amplification module comprises a first resistor R1 and a second resistor R2, and is used for dividing voltage when the first triode Q1 is not conducted so as to protect a circuit, the amplification factor of the power amplification module is determined by the first resistor R1, the second resistor R2, the third resistor R3 and the resistance value of the magnification selection module, when the resistance value of the magnification selection module is larger, the amplification factor of the power amplification module is larger, so that the effect of changing the amplification factor of the power amplification module is achieved by changing the resistance value of the magnification selection module, wherein the amplification factor refers to the ratio of the signal intensity output by the collector of the first triode Q1 to the signal intensity input by the base of the first triode Q1.
3. The magnification selection switch KM1-1 is a single-pole double-throw switch, so that the function of switching the magnification of the power amplification module can be achieved by changing the connection position of the moving end; the movable end of the multiplying power selection switch KM1-1 is connected to a power supply voltage VCC, the first fixed end of the multiplying power selection switch KM1-1 is connected with the collector of a first triode Q1 after being connected with a fourth resistor R4 in series, and the second fixed end of the multiplying power selection switch KM1-1 is connected with the collector of the first triode Q1 after being connected with a fifth resistor R5 in series, so that the effect of selectively connecting the fourth resistor R4 or the fifth resistor R5 can be achieved by changing the connection position of the movable end of the multiplying power selection switch KM1-1, and the resistance value of the multiplying power selection module is further changed; the initial position of the movable end of the magnification selection switch KM1-1 is connected to the first stationary end, i.e. the initial magnification of the power amplifier module is determined by the fourth resistor R4.
Drawings
Fig. 1 is a control circuit diagram of a navigation voice acquisition module in an embodiment of the present application.
Fig. 2 is a control circuit diagram of an execution module in the embodiment of the present application.
Description of reference numerals: 1. a navigation voice acquisition module; 2. a power amplifier module; 21. a multiplying power selection module; 3. a navigation voice broadcasting module; 4. a call state detection module; 5. a switch module; 6. an execution module; 7. a first filtering module; 8. and a second filtering module.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses an audio signal processing circuit. Referring to fig. 1 and 2, the audio signal processing circuit includes a navigation voice acquisition module 1, a power amplifier module 2, a navigation voice broadcast module 3, a call state detection module 4, a switch module 5, and an execution module 6.
Navigation voice acquisition module 1 is arranged in gathering vehicle navigation equipment's navigation voice signal and output, and navigation voice acquisition module 1 is including being arranged in gathering vehicle navigation equipment navigation voice signal and the sound collection chip of output, and the sound is gathered the chip and is established ties in power supply circuit, and the signal output part of sound collection chip connects in power amplifier module 2.
The power amplifier module 2 is coupled to the navigation voice acquisition module 1 to perform amplification factor adjustment on the received signal and output the signal, and the power amplifier module 2 comprises a first resistor R1, a second resistor R2, a first triode Q1, a third resistor R3 and a rate selection module 21 for changing the amplification factor of the power amplifier module 2 by controlling the change of a resistance value; one end of the first resistor R1 is connected to the power supply voltage VCC, the other end is connected in series with the second resistor R2 and then grounded, the connection nodes of the first resistor R1 and the second resistor R2 are respectively connected to the signal output end of the sound collection chip and the base of the first triode Q1, the emitter of the first triode Q1 is connected in series with the third resistor R3 and then grounded, the collector of the first triode Q1 is connected in series with the magnification selection module 21 and then connected to the power supply voltage VCC, and the connection node of the first triode Q1 and the magnification selection module 21 is connected to the navigation voice broadcast module 3.
The multiplying power selection module 21 comprises a multiplying power selection switch KM1-1, a fourth resistor R4 and a fifth resistor R5, wherein the multiplying power selection switch KM1-1 is a single-pole double-throw switch, the movable end of the multiplying power selection switch KM1-1 is connected to a power supply voltage VCC, the first immovable end of the multiplying power selection switch KM1-1 and the fourth resistor R4 are connected in series and then connected to the collector of a first triode Q1, the second immovable end of the multiplying power selection switch KM1-1 and the fifth resistor R5 are connected in series and then connected to the collector of the first triode Q1, and the initial position of the movable end of the multiplying power selection switch KM1-1 is connected to the first immovable end; the fourth resistor R4 and the fifth resistor R5 are adjustable resistors, so that the resistance of the fifth resistor R5 can be preset to be lower than that of the fourth resistor R4 in order to make the driver hear the contents of the voice call when the driver is engaged in the voice call.
Navigation voice broadcast module 3 is coupled in power amplifier module 2 to turn into the sound signal output with the navigation voice signal who receives, navigation voice broadcast module 3 includes the speaker, and the signal input part of speaker is connected in the connected node of first triode Q1 and multiplying power selection module 21, other end ground connection.
The call state detection module 4 is used for detecting the state of the voice call function of the vehicle-mounted navigation device, so as to send out a voice call activation signal when detecting the activation of the voice call function, the call state detection module 4 comprises a state detection sensor for detecting the state of the voice call function of the vehicle-mounted navigation device, in this embodiment, the state detection sensor can be a current detection sensor, when the voice call function of the vehicle-mounted navigation device is activated, the state detection sensor detects the current of the relevant components of the voice call function so as to achieve the function of detecting whether the voice call function is activated, the state detection sensor is connected in series with a power supply loop, and the signal output end of the state detection sensor is connected to the switch module 5 after passing through a sixth resistor R6.
The switch module 5 is coupled to the call state detection module 4 to send out a switch signal when receiving the voice call activation signal, the switch module 5 includes a second transistor Q2, a base of the second transistor Q2 is coupled to the signal output terminal of the state detection sensor through a sixth resistor R6, a collector of the second transistor Q2 is coupled to the power voltage VCC after being connected in series with a seventh resistor R7, and an emitter of the second transistor Q2 is coupled to the execution module 6 and then grounded.
The execution module 6 is coupled to the switch module 5 and is connected in series in the power amplifier module 2 to change the amplification factor, the execution module 6 includes a first relay KM1, one end of a coil of the first relay KM1 is connected to the switch module 5, the other end of the coil is grounded, and the first relay KM1 includes a factor selection switch KM 1-1.
The embodiment of the application discloses a vehicle-mounted navigation device; the vehicle navigation equipment comprises a loudspeaker for voice broadcasting of navigation information, and any audio signal processing circuit is coupled with the loudspeaker.
The implementation principle of the audio signal processing circuit and the vehicle-mounted navigation equipment in the embodiment of the application is as follows: an audio signal processing circuit is coupled with a loudspeaker of the vehicle-mounted navigation equipment and used for controlling the volume of navigation information broadcast, when a driver uses the vehicle-mounted navigation equipment, a navigation voice signal in the vehicle-mounted navigation equipment is collected by a navigation voice collection module 1 and output to a power amplification module 2, the power amplification module 2 adjusts the amplification ratio of the received navigation voice signal, the navigation voice signal with the adjusted amplification ratio is output to a navigation voice broadcast module 3, the navigation voice broadcast module 3 converts the received navigation voice signal after amplification adjustment into a sound signal to be output, the navigation information is conveyed to the driver through sound, the navigation information is obtained under the condition that the driver does not need to look over a screen of the vehicle-mounted navigation equipment with a low head, and the driving safety is improved.
When a driver uses the voice call function, the call state detection module 4 detects that the voice call function is activated, generates a voice call activation signal and sends the voice call activation signal to the switch module 5, the switch module 5 generates a switch signal and sends the switch signal to the execution module 6 when receiving the voice call activation signal, the execution module 6 comprises a first relay KM1, the first relay KM1 comprises a multiplying power selection switch KM1-1, when the first relay KM1 receives the switch signal, the execution signal is sent out to enable the movable end of the multiplying power selection switch KM1-1 to move from the first fixed end to the second fixed end, and the resistance value of the multiplying power selection module 21 is equivalent to the resistance value of the fifth resistor R5, to achieve the effect of automatically controlling the resistance value of the magnification selection module 21 when the driver makes a voice call, the power amplification module 2 is controlled to change the amplification power, so that the driver can listen to the content of the voice call clearly; the driver can adjust the volume of the navigation information broadcast when the voice call is not performed by adjusting the resistance value of the fourth resistor R4, and can also adjust the volume of the navigation information broadcast when the voice call is performed by adjusting the resistance value of the fifth resistor R5.
The audio signal processing circuit further includes: first filtering module 7 and second filtering module 8, wherein first filtering module 7 sets up between navigation voice acquisition module 1 and power amplifier module 2, be used for filtering initial voice navigation signal, in order to eliminate the noise, second filtering module 8 sets up between power amplifier module 2 and navigation voice broadcast module 3, be used for filtering the voice navigation signal after power amplifier module 2 enlargies, in order to eliminate the noise once more, carry out the elimination of noise through two-stage filtering, in order to improve the tone quality that navigation information reported, improve user experience.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. An audio signal processing circuit characterized by: the audio signal processing circuit is used for controlling the volume of navigation information broadcast and comprises a navigation voice acquisition module (1), a power amplifier module (2), a navigation voice broadcast module (3), a call state detection module (4), a switch module (5) and an execution module (6); wherein:
the navigation voice acquisition module (1) is used for acquiring and outputting navigation voice signals of the vehicle-mounted navigation equipment;
the power amplification module (2) is coupled with the navigation voice acquisition module (1) and used for adjusting the amplification factor of the received signal and outputting the signal;
the navigation voice broadcasting module (3) is coupled to the power amplifier module (2) and used for converting the received navigation voice signal into a sound signal to be output;
the call state detection module (4) is used for detecting the state of the voice call function of the vehicle-mounted navigation equipment so as to send out a voice call activation signal when the voice call function is detected to be activated;
the switch module (5) is coupled with the call state detection module (4) and used for sending out a switch signal when receiving the voice call activation signal;
and the execution module (6) is coupled with the switch module (5) and is connected in series in the power amplification module (2) so as to change the amplification factor.
2. An audio signal processing circuit according to claim 1, wherein: the navigation voice acquisition module (1) comprises a voice acquisition chip which is used for acquiring navigation voice signals in the vehicle-mounted navigation equipment and outputting the navigation voice signals, the voice acquisition chip is connected in series with the power supply loop, and the signal output end of the voice acquisition chip is connected to the power amplifier module (2).
3. An audio signal processing circuit according to claim 2, wherein: the power amplification module (2) comprises a first resistor R1, a second resistor R2, a first triode Q1, a third resistor R3 and a multiplying power selection module (21) for changing the amplifying power of the power amplification module (2) by controlling the change of a resistance value; the one end of first resistor R1 is connected in mains voltage VCC, and the other end is grounded after establishing ties with second resistor R2, the connected node of first resistor R1 and second resistor R2 connects respectively in the signal output part of sound collection chip and the base of first triode Q1, the projecting pole of first triode Q1 is grounded after establishing ties with third resistor R3, the collecting electrode of first triode Q1 is connected in mains voltage VCC after establishing ties with magnification selection module (21), the connected node of first triode Q1 and magnification selection module (21) is connected in navigation voice broadcast module (3).
4. An audio signal processing circuit according to claim 3, wherein: the multiplying power selection module (21) comprises a multiplying power selection switch KM1-1, a fourth resistor R4 and a fifth resistor R5, the multiplying power selection switch KM1-1 is a single-pole double-throw switch, the movable end of the multiplying power selection switch KM1-1 is connected to a power supply voltage VCC, the first fixed end of the multiplying power selection switch KM1-1 and the fourth resistor R4 are connected in series and then connected to the collector of a first triode Q1, the second fixed end of the multiplying power selection switch KM1-1 and the fifth resistor R5 are connected in series and then connected to the collector of the first triode Q1, and the initial position of the movable end of the multiplying power selection switch KM1-1 is connected to the first fixed end.
5. An audio signal processing circuit according to claim 4, wherein: the execution module (6) comprises a first relay KM1, one end of a coil of the first relay KM1 is connected to the switch module (5), the other end of the coil is grounded, and the first relay KM1 comprises a multiplying power selection switch KM 1-1.
6. An audio signal processing circuit according to claim 4, wherein: the fourth resistor R4 is an adjustable resistor, and the fifth resistor R5 is an adjustable resistor.
7. An audio signal processing circuit according to claim 4, wherein: navigation voice broadcast module (3) include the speaker, the signal input part of speaker connect in the connected node of first triode Q1 and multiplying power selection module (21), other end ground connection.
8. An audio signal processing circuit according to claim 7, wherein: the call state detection module (4) comprises a state detection sensor for detecting the voice call function state of the vehicle-mounted navigation equipment, the state detection sensor is connected in series with the power supply loop, and the signal output end of the state detection sensor is connected to the switch module (5) through a sixth resistor R6.
9. An audio signal processing circuit according to claim 7, wherein: the audio signal processing circuit further includes: first filtering module (7) and second filtering module (8), first filtering module (7) includes first filtering capacitance C1, the signal output part of sound collection chip is connected to the one end of first filtering capacitance C1, and the other end is connected in the connected node of first resistor R1 and second resistor R2, second filtering module (8) includes second filtering capacitance C2, the one end of second filtering capacitance C2 connect in the connected node of first triode Q1 and multiplying power selection module (21), the other end connect in the signal input part of speaker.
10. An in-vehicle navigation apparatus characterized in that: the car navigation device comprises a loudspeaker for voice broadcasting navigation information, and the audio signal processing circuit of any one of claims 1 to 9 is coupled with the loudspeaker.
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| CN202220886530.0U CN217088099U (en) | 2022-04-18 | 2022-04-18 | Audio signal processing circuit and vehicle navigation equipment |
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| CN202220886530.0U CN217088099U (en) | 2022-04-18 | 2022-04-18 | Audio signal processing circuit and vehicle navigation equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116996813A (en) * | 2023-09-27 | 2023-11-03 | 深圳市立平科技有限公司 | Analog audio input amplitude limiting circuit for sound equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116996813A (en) * | 2023-09-27 | 2023-11-03 | 深圳市立平科技有限公司 | Analog audio input amplitude limiting circuit for sound equipment |
| CN116996813B (en) * | 2023-09-27 | 2024-01-26 | 深圳市立平科技有限公司 | Analog audio input amplitude limiting circuit for sound equipment |
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