CN110662137A - Vehicle-mounted audio linear amplification circuit and device - Google Patents
Vehicle-mounted audio linear amplification circuit and device Download PDFInfo
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- CN110662137A CN110662137A CN201910926878.0A CN201910926878A CN110662137A CN 110662137 A CN110662137 A CN 110662137A CN 201910926878 A CN201910926878 A CN 201910926878A CN 110662137 A CN110662137 A CN 110662137A
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The embodiment of the application discloses linear amplifier circuit of on-vehicle audio frequency and device, this circuit includes: the first filtering circuit and the second filtering amplifying circuit; the first input end of the first filter circuit and the second input end of the first filter circuit are respectively connected with left and right audio signal interfaces, the first output end of the first filter circuit is connected with the first input end of the second filter amplifying circuit, the second output end of the first filter circuit is connected with the second input end of the second filter amplifying circuit, and the first output end of the second filter amplifying circuit and the second output end of the second filter amplifying circuit are connected with a rear-stage functional amplifier. By implementing the embodiment of the application, the problem of pop sound in the vehicle audio system can be solved in a single-power-supply low-voltage mode, and the circuit is simplified.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a vehicle-mounted audio linear amplification circuit and a device.
Background
With the development of the internet, the automobile reserves are increased year by year and the purchasing population is younger, the internet of vehicles by consumers cannot meet the basic security function, and music entertainment is increased to the first requirement of the internet of vehicles, so that the compelling degree of the consumers and vehicle-mounted terminal manufacturers to the vehicle-mounted audio content is also increased rapidly.
In order to meet the requirement of the amplitude of an input signal of a power amplifier of a vehicle-mounted sound system, the effective value of an output signal of a front audio linear amplifier is 2V or more, the working voltage is usually set to be very high under the condition of undistorted output, a direct current bias voltage is set at an input end, a large direct current blocking capacitor is connected in series at an output end, and a triode circuit is required to be built to realize the function of silence.
Disclosure of Invention
The embodiment of the application provides a vehicle-mounted audio linear amplification circuit and a device, which can solve the problem of burst sound in a vehicle-mounted audio system in a single-power low-voltage mode and simplify the circuit.
In a first aspect of the embodiments of the present application, a vehicle-mounted audio linear amplification circuit is provided, including a first filter circuit and a second filter amplification circuit, wherein:
a first input end of the first filter circuit and a second input end of the first filter circuit are respectively connected with a left audio signal interface and a right audio signal interface, a first output end of the first filter circuit is connected with a first input end of the second filter amplifying circuit, a second output end of the first filter circuit is connected with a second input end of the second filter amplifying circuit, and a first output end of the second filter amplifying circuit and a second output end of the second filter amplifying circuit are connected with a rear-stage functional amplifier;
the first filtering circuit receives an audio signal and transmits the audio signal to the second filtering and amplifying circuit, the second filtering and amplifying circuit receives the audio signal and transmits the audio signal to the rear-stage functional amplifier, and the vehicle-mounted audio linear amplifying circuit is used for performing filtering and amplifying processing on the audio signal.
In one possible implementation, the first filtering circuit includes a first left channel filtering circuit and a first right channel filtering circuit, where:
the input end of the first left channel filter circuit is connected with a left audio signal interface, the output end of the first left channel filter circuit is connected with the first input end of the second filter amplifying circuit, the input end of the first right channel filter circuit is connected with a right audio signal interface, and the output end of the first right channel filter circuit is connected with the second input end of the second filter amplifying circuit;
the first left channel filter circuit receives a left audio signal and transmits the left audio signal to the first input end of the second filter amplifying circuit, and the first right channel filter circuit receives a right audio signal and transmits the right audio signal to the second input end of the second filter amplifying circuit.
In one possible implementation, the first left channel filter circuit includes a first resistor, a first capacitor, and a third capacitor, where:
the first end of the first resistor is connected with the left audio signal interface, the second end of the first resistor is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the first end of the third capacitor and the first input end of the second filtering and amplifying circuit, and the second end of the third capacitor is connected with the ground wire.
In one possible implementation, the first right channel filter circuit includes a second resistor, a second capacitor, and a fourth capacitor, where:
the first end of the second resistor is connected with the right audio signal interface, the second end of the second resistor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the first end of the fourth capacitor and the second input end of the second filtering and amplifying circuit, and the second end of the fourth capacitor is connected with the ground wire.
In one possible implementation manner, the second filtering and amplifying circuit includes a second left channel filtering and amplifying circuit and a second right channel filtering and amplifying circuit, where:
the input end of the second left channel filtering and amplifying circuit is connected with the output end of the first left channel filtering and amplifying circuit, the input end of the second right channel filtering and amplifying circuit is connected with the output end of the first right channel filtering and amplifying circuit, and the output ends of the second left channel filtering and amplifying circuit and the second right channel filtering and amplifying circuit are connected with the rear-stage functional amplifier;
the second left channel filtering and amplifying circuit receives the left audio signal and transmits the left audio signal to the rear-stage functional amplifier, and the second right channel filtering and amplifying circuit receives the right audio signal and transmits the right audio signal to the rear-stage functional amplifier.
In one possible implementation manner, the second left channel filtering and amplifying circuit includes a third resistor, a fifth capacitor, and an operational amplifying circuit, where:
the first end of the third resistor is connected with the second end of the first capacitor, the first end of the third capacitor and the first end of the fifth resistor, the second end of the third resistor is connected with the first end of the fifth capacitor and the first input end of the operational amplification circuit, the first end of the fifth resistor is connected with the second end of the first capacitor and the first end of the third capacitor, the second end of the fifth resistor is connected with the second end of the fifth capacitor and the first output end of the operational amplification circuit, the first end of the fifth capacitor is connected with the first input end of the operational amplification circuit, and the second end of the fifth capacitor is connected with the first output end of the operational amplification circuit.
In one possible implementation manner, the second right channel filtering and amplifying circuit includes a fourth resistor, a sixth capacitor, and the operational amplifying circuit, where:
the first end of the fourth resistor is connected with the second end of the second capacitor, the first end of the fourth capacitor and the first end of the sixth resistor, the second end of the fourth resistor is connected with the first end of the sixth capacitor and the second input end of the operational amplification circuit, the first end of the sixth resistor is connected with the second end of the second capacitor and the first end of the fourth capacitor, the second end of the sixth resistor is connected with the second end of the sixth capacitor and the second output end of the operational amplification circuit, the first end of the sixth capacitor is connected with the second input end of the operational amplification circuit, and the second end of the sixth capacitor is connected with the second output end of the operational amplification circuit.
In one possible implementation manner, the operational amplifier circuit includes an operational amplifier, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor, where:
a first input end of the operational amplifier is connected with a second end of the third resistor and a first end of the fifth capacitor, a second input end of the operational amplifier is connected with a second end of the fourth resistor and a first end of the sixth capacitor, a first output end of the operational amplifier is connected with a second end of the fifth capacitor, a second end of the fifth resistor, a first end of the twelfth resistor and the later-stage functional amplifier, and a second output end of the operational amplifier is connected with a second end of the sixth capacitor, a second end of the sixth resistor, a first end of the thirteenth resistor and the later-stage functional amplifier; a first end of the seventh capacitor is connected with a negative power supply pin of the operational amplifier, and a second end of the seventh capacitor is connected with a second end of the ninth capacitor and the ground wire; a first end of the eighth capacitor is connected with the first capacitor connecting pin of the operational amplifier, and a second end of the eighth capacitor is connected with the second capacitor connecting pin of the operational amplifier; a first end of the ninth capacitor is connected with a power supply, a first end of the seventh resistor and a power supply pin of the operational amplifier, and a second end of the ninth capacitor is connected with a ground wire; a first end of the seventh resistor is connected with a power supply and a power supply pin of the operational amplifier, and a second end of the seventh resistor is connected with an undervoltage protection pin of the operational amplifier and a first end of the fourteenth resistor; a second end of the twelfth resistor and a second end of the thirteenth resistor are connected with the same ground wire; a first end of the fourteenth resistor is connected with an undervoltage protection pin of the operational amplifier, and a second end of the fourteenth resistor is connected with a ground wire; the first end of the fifteenth resistor is connected with a controller and an enabling pin of the operational amplifier, and the second end of the fifteenth resistor is connected with the ground wire.
In a possible implementation manner, the eighth capacitor is a flying capacitor, and is used for executing a process of providing working negative pressure required by the operational amplifier; the controller controls turning on and off of the operational amplifier for performing a mute process.
In a second aspect of the embodiments of the present application, a device for linearly amplifying a vehicle audio is provided, and includes a power supply, the controller, and the vehicle audio linear amplification circuit of any one of the first aspect of the embodiments of the present application.
The embodiment of the application provides a linear amplifier circuit of on-vehicle audio frequency, including first filter circuit and second filter amplifier circuit, wherein:
a first input end of the first filter circuit and a second input end of the first filter circuit are respectively connected with a left audio signal interface and a right audio signal interface, a first output end of the first filter circuit is connected with a first input end of the second filter amplifying circuit, a second output end of the first filter circuit is connected with a second input end of the second filter amplifying circuit, and a first output end of the second filter amplifying circuit and a second output end of the second filter amplifying circuit are connected with a rear-stage functional amplifier;
the first filtering circuit receives an audio signal and transmits the audio signal to the second filtering and amplifying circuit, the second filtering and amplifying circuit receives the audio signal and transmits the audio signal to the rear-stage functional amplifier, and the vehicle-mounted audio linear amplifying circuit is used for performing filtering and amplifying processing on the audio signal.
By implementing the embodiment of the application, the problem of burst sound in the vehicle-mounted audio system can be solved in a single-power-supply low-voltage mode, the circuit is simplified, and the space and the cost of the circuit board are saved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic structural diagram of a vehicle audio linear amplification circuit disclosed in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another vehicular audio linear amplification circuit disclosed in the embodiment of the present application;
fig. 3 is a schematic structural diagram of another vehicular audio linear amplification circuit disclosed in the embodiment of the present application;
fig. 4 is a schematic structural diagram of another vehicular audio linear amplification circuit disclosed in the embodiment of the present application;
fig. 5 is a schematic structural diagram of another vehicular audio linear amplification circuit disclosed in the embodiment of the present application;
fig. 6 is a schematic structural diagram of another vehicular audio linear amplification circuit disclosed in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
The embodiment of the application provides a vehicle-mounted audio linear amplification circuit and a device, and the detailed description is given below.
Reference in the embodiments of the present application to the terms "first", "second", and the like, are used for distinguishing between different objects and not for describing a particular order, and furthermore, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicular audio linear amplifying circuit disclosed in an embodiment of the present application. As shown in fig. 1, the vehicle-mounted audio linear amplification circuit described in this embodiment includes a first filter circuit 01 and a second filter amplification circuit 02, where:
a first input end 11 of the first filter circuit 01 and a second input end 14 of the first filter circuit 01 are respectively connected with left and right audio signal interfaces, a first output end 12 of the first filter circuit 01 is connected with a first input end 21 of the second filter amplifying circuit 02, a second output end 13 of the first filter circuit 01 is connected with a second input end 24 of the second filter amplifying circuit 02, and a first output end 22 of the second filter amplifying circuit 02 and a second output end 23 of the second filter amplifying circuit 02 are connected with a rear-stage functional amplifier;
the first filter circuit 01 receives audio signals and transmits the audio signals to the second filter amplifying circuit 02, the second filter amplifying circuit 02 receives the audio signals and transmits the audio signals to the rear-stage functional amplifier, and the vehicle-mounted audio linear amplifying circuit is used for filtering and amplifying the audio signals. The embodiment can solve the problem of burst sound in the vehicle-mounted audio system in a single-power-supply low-voltage mode, simplify the circuit and save the space and the cost of the circuit board.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another vehicular audio linear amplifying circuit disclosed in the embodiment of the present application. As shown in fig. 2, the first filter circuit 01 described in the present embodiment includes a first left channel filter circuit 011 and a first right channel filter circuit 012, in which:
an input end 11 of the first left channel filter circuit 011 is connected with a left audio signal interface, an output end 12 of the first left channel filter circuit 011 is connected with a first input end 21 of the second filter amplifying circuit 02, an input end 14 of the first right channel filter circuit 012 is connected with a right audio signal interface, and an output end 13 of the first right channel filter circuit 012 is connected with a second input end 24 of the second filter amplifying circuit 02;
the first left channel filter circuit 011 receives the left audio signal and transmits the left audio signal to the first input terminal 21 of the second filter amplifier circuit 02, and the first right channel filter circuit 012 receives the right audio signal and transmits the right audio signal to the second input terminal 24 of the second filter amplifier circuit 02.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another vehicular audio linear amplifying circuit disclosed in the embodiment of the present application. As shown in fig. 3, the first left channel filter circuit 011 described in the present embodiment includes a first resistor R1, a first capacitor C1, and a third capacitor C3, wherein:
a first end 111 of the first resistor R1 is connected to the left audio signal interface, a second end 112 of the first resistor R1 is connected to a first end 113 of the first capacitor C1, a second end 114 of the first capacitor C1 is connected to a first end 115 of the third capacitor C3 and the first input end 21 of the second filter and amplifier circuit 02, and a second end 116 of the third capacitor C3 is connected to the ground;
the first right channel filter circuit 012 described in this embodiment includes a second resistor R2, a second capacitor C2, and a fourth capacitor C4, where:
the first end 121 of the second resistor R2 is connected to the right audio signal interface, the second end 122 of the second resistor R2 is connected to the first end 123 of the second capacitor C2, the second end 124 of the second capacitor C2 is connected to the first end 125 of the fourth capacitor C4 and the second input end 24 of the second filter amplifier circuit 02, the second end 126 of the fourth capacitor C4 is connected to the ground, and the second end 126 of the fourth capacitor C4 and the second end 116 of the third capacitor C3 are at the same ground level.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another vehicular audio linear amplifying circuit disclosed in the embodiment of the present application. As shown in fig. 4, the second filter amplifying circuit 02 described in the present embodiment includes a second left channel filter amplifying circuit 021 and a second right channel filter amplifying circuit 022, wherein:
an input end 21 of the second left channel filtering and amplifying circuit 021 is connected with an output end 12 of the first left channel filtering and amplifying circuit 011, an input end 24 of the second right channel filtering and amplifying circuit 022 is connected with an output end 13 of the first right channel filtering and amplifying circuit 012, and an output end 22 of the second left channel filtering and amplifying circuit 021 and an output end 23 of the second right channel filtering and amplifying circuit 022 are connected with a rear-stage functional amplifier;
the second left channel filter amplifier circuit 021 receives the left audio signal and transmits the left audio signal to the post-stage functional amplifier, and the second right channel filter amplifier circuit 022 receives the right audio signal and transmits the right audio signal to the post-stage functional amplifier.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another vehicular audio linear amplifying circuit disclosed in the embodiment of the present application. As shown in fig. 5, the second left channel filter amplifier circuit 021 described in this embodiment includes a third resistor R3, a fifth resistor R5, a fifth capacitor C5, and an operational amplifier circuit 023, where:
a first end 211 of the third resistor R3 is connected to the second end 114 of the first capacitor C1, the first end 115 of the third capacitor C3, and the first end 215 of the fifth resistor R5, a second end 212 of the third resistor R3 is connected to the first end 213 of the fifth capacitor C5 and the first input end 217 of the operational amplifier circuit 023, a first end 215 of the fifth resistor R5 is connected to the second end 114 of the first capacitor C1 and the first end 115 of the third capacitor C3, a second end 216 of the fifth resistor R5 is connected to the second end 214 of the fifth capacitor C5 and the first output end 218 of the operational amplifier circuit 023, a first end 213 of the fifth capacitor C5 is connected to the first input end 217 of the operational amplifier circuit 023, and a second end 214 of the fifth capacitor C5 is connected to the first output end 218 of the operational amplifier circuit 023;
the second right channel filter amplifier circuit 022 described in this embodiment includes a fourth resistor R4, a sixth resistor R6, a sixth capacitor C6, and an operational amplifier circuit 023, where:
a first end 221 of the fourth resistor R4 is connected to the second end 124 of the second capacitor C2, the first end 125 of the fourth capacitor C4, and the first end 225 of the sixth resistor R6, a second end 222 of the fourth resistor R4 is connected to the first end 223 of the sixth capacitor C6 and the second input end 227 of the operational amplifier circuit 023, a first end 225 of the sixth resistor R6 is connected to the second end 124 of the second capacitor C2 and the first end 125 of the fourth capacitor C4, a second end 226 of the sixth resistor R6 is connected to the second end 224 of the sixth capacitor C6 and the second output end 228 of the operational amplifier circuit 023, a first end 223 of the sixth capacitor C6 is connected to the second input end 227 of the operational amplifier circuit 023, and a second end 224 of the sixth capacitor C6 is connected to the second output end 228 of the operational amplifier circuit 023.
Referring to fig. 6, fig. 6 is a schematic structural diagram of another vehicular audio linear amplifying circuit disclosed in the embodiment of the present application. As shown in fig. 6, the operational amplifier circuit 023 described in the present embodiment includes an operational amplifier U1, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a seventh resistor R7, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15, where:
a first input end 217 of the operational amplifier U1 is connected to the second end 212 of the third resistor R3 and the first end 213 of the fifth capacitor C5, a second input end 227 of the operational amplifier U1 is connected to the second end 222 of the fourth resistor R4 and the first end 223 of the sixth capacitor C6, a first output end 218 of the operational amplifier U1 is connected to the second end 214 of the fifth capacitor C5, the second end 216 of the fifth resistor R5, the first end 245 of the twelfth resistor R12 and a subsequent functional amplifier, and a second output end 228 of the operational amplifier U1 is connected to the second end 224 of the sixth capacitor C6, the second end 226 of the sixth resistor R6, the first end 247 of the thirteenth resistor R13 and the subsequent functional amplifier;
a first terminal 237 of the seventh capacitor C7 is connected to the negative power supply pin 232 of the operational amplifier U1, and a second terminal 238 of the seventh capacitor C7 is connected to the second terminal 242 of the ninth capacitor C9 and ground; a first terminal 239 of the eighth capacitor C8 is connected to the first capacitor connection pin 235 of the operational amplifier U1, and a second terminal 240 of the eighth capacitor C8 is connected to the second capacitor connection pin 236 of the operational amplifier U1; a first end 241 of the ninth capacitor C9 is connected to the power VCC, a first end 243 of the seventh resistor R7 and the power pin 233 of the operational amplifier U1, and a second end 242 of the ninth capacitor C9 is connected to the ground; the first capacitor connection pin 235 and the second capacitor connection pin 236 are capacitor connection pins of a charge pump inside the operational amplifier U1, the eighth capacitor C8 is a flying capacitor for generating a working negative voltage required by the operational amplifier U1, the flying capacitor is faster to charge than a common capacitor, the cycle life is long, the large current capability is strong, and the ultra-low temperature characteristic is good, the seventh capacitor C7 connected to the negative power supply pin 232 is used for stabilizing the negative voltage, and in order to improve the power supply efficiency, an Equivalent Series Resistance (ESR) of the seventh capacitor C7 and the eighth capacitor C8 must be sufficiently small to reduce the energy loss, and capacitors made of X5R and X7R materials can be selected;
a first end 243 of the seventh resistor R7 is connected to the power VCC and the power pin 233 of the operational amplifier U1, and a second end 244 of the seventh resistor R7 is connected to the under-voltage protection pin 234 of the operational amplifier U1 and the first end 249 of the fourteenth resistor R14; the second end 246 of the twelfth resistor R12 and the second end 248 of the thirteenth resistor R13 are connected to the same ground; a first end 249 of the fourteenth resistor R14 is connected to the undervoltage protection pin 234 of the operational amplifier U1, and a second end 250 of the fourteenth resistor R14 is connected to the ground; a first end 251 of the fifteenth resistor R15 is connected with the enable pin 231 of the controller and operational amplifier U1, and a second end 252 of the fifteenth resistor R15 is connected with the ground line; the power VCC is a single power supply low voltage, and has a high power supply rejection ratio, the operational amplifier is automatically turned off when the voltage of the undervoltage protection pin 234 is lower than 1.2V, the seventh resistor R7 and the fourteenth resistor R14 are voltage dividing resistors, the power VCC is connected to the undervoltage protection pin 234 through the voltage dividing resistors, so that the undervoltage protection function of the power supply can be realized, the enable pin 231 is connected with the pull-down resistor fifteenth resistor R15 to the ground, the high and low levels of the enable pin are provided through the I/O interface of the controller, the turning on and off of the operational amplifier can be flexibly controlled, the purpose of muting is achieved, a complicated triode muting circuit is omitted, and the second end 252 of the fifteenth resistor R15, the second end 116 of the third capacitor C3 and the second end 126 of the fourth capacitor C4 are at the same ground level;
the foregoing detailed description is directed to a vehicle audio linear amplification circuit and a device provided in an embodiment of the present application, and a specific example is applied in the detailed description to explain the principles and implementations of the present application, and the description of the foregoing embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. An in-vehicle audio linear amplification circuit, comprising:
the first filtering circuit and the second filtering amplifying circuit;
a first input end of the first filter circuit and a second input end of the first filter circuit are respectively connected with a left audio signal interface and a right audio signal interface, a first output end of the first filter circuit is connected with a first input end of the second filter amplifying circuit, a second output end of the first filter circuit is connected with a second input end of the second filter amplifying circuit, and a first output end of the second filter amplifying circuit and a second output end of the second filter amplifying circuit are connected with a rear-stage functional amplifier;
the first filtering circuit receives an audio signal and transmits the audio signal to the second filtering and amplifying circuit, the second filtering and amplifying circuit receives the audio signal and transmits the audio signal to the rear-stage functional amplifier, and the vehicle-mounted audio linear amplifying circuit is used for performing filtering and amplifying processing on the audio signal.
2. The car audio linear amplification circuit according to claim 1, wherein the first filter circuit includes:
a first left channel filter circuit and a first right channel filter circuit;
the input end of the first left channel filter circuit is connected with a left audio signal interface, the output end of the first left channel filter circuit is connected with the first input end of the second filter amplifying circuit, the input end of the first right channel filter circuit is connected with a right audio signal interface, and the output end of the first right channel filter circuit is connected with the second input end of the second filter amplifying circuit;
the first left channel filter circuit receives a left audio signal and transmits the left audio signal to the first input end of the second filter amplifying circuit, and the first right channel filter circuit receives a right audio signal and transmits the right audio signal to the second input end of the second filter amplifying circuit.
3. The in-vehicle audio linear amplification circuit according to claim 2, wherein the first left channel filter circuit includes: a first resistor, a first capacitor and a third capacitor;
the first end of the first resistor is connected with the left audio signal interface, the second end of the first resistor is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the first end of the third capacitor and the first input end of the second filtering and amplifying circuit, and the second end of the third capacitor is connected with the ground wire.
4. The in-vehicle audio linear amplification circuit according to claim 2 or 3, wherein the first right channel filter circuit includes: a second resistor, a second capacitor and a fourth capacitor;
the first end of the second resistor is connected with the right audio signal interface, the second end of the second resistor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the first end of the fourth capacitor and the second input end of the second filtering and amplifying circuit, and the second end of the fourth capacitor is connected with the ground wire.
5. The car audio linear amplification circuit according to claim 4, wherein the second filter amplification circuit comprises:
the second left channel filtering and amplifying circuit and the second right channel filtering and amplifying circuit;
the input end of the second left channel filtering and amplifying circuit is connected with the output end of the first left channel filtering and amplifying circuit, the input end of the second right channel filtering and amplifying circuit is connected with the output end of the first right channel filtering and amplifying circuit, and the output ends of the second left channel filtering and amplifying circuit and the second right channel filtering and amplifying circuit are connected with the rear-stage functional amplifier;
the second left channel filtering and amplifying circuit receives the left audio signal and transmits the left audio signal to the rear-stage functional amplifier, and the second right channel filtering and amplifying circuit receives the right audio signal and transmits the right audio signal to the rear-stage functional amplifier.
6. The in-vehicle audio linear amplification circuit according to claim 5, wherein the second left channel filter amplification circuit comprises: the third resistor, the fifth capacitor and the operational amplifier circuit;
the first end of the third resistor is connected with the second end of the first capacitor, the first end of the third capacitor and the first end of the fifth resistor, the second end of the third resistor is connected with the first end of the fifth capacitor and the first input end of the operational amplification circuit, the first end of the fifth resistor is connected with the second end of the first capacitor and the first end of the third capacitor, the second end of the fifth resistor is connected with the second end of the fifth capacitor and the first output end of the operational amplification circuit, the first end of the fifth capacitor is connected with the first input end of the operational amplification circuit, and the second end of the fifth capacitor is connected with the first output end of the operational amplification circuit.
7. The vehicular audio linear amplification circuit according to claim 6, wherein the second right channel filter amplification circuit comprises: the fourth resistor, the sixth capacitor and the operational amplifier circuit;
the first end of the fourth resistor is connected with the second end of the second capacitor, the first end of the fourth capacitor and the first end of the sixth resistor, the second end of the fourth resistor is connected with the first end of the sixth capacitor and the second input end of the operational amplification circuit, the first end of the sixth resistor is connected with the second end of the second capacitor and the first end of the fourth capacitor, the second end of the sixth resistor is connected with the second end of the sixth capacitor and the second output end of the operational amplification circuit, the first end of the sixth capacitor is connected with the second input end of the operational amplification circuit, and the second end of the sixth capacitor is connected with the second output end of the operational amplification circuit.
8. The vehicular audio linear amplification circuit according to claim 7, wherein the operational amplification circuit comprises: the operational amplifier, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor;
a first input end of the operational amplifier is connected with a second end of the third resistor and a first end of the fifth capacitor, a second input end of the operational amplifier is connected with a second end of the fourth resistor and a first end of the sixth capacitor, a first output end of the operational amplifier is connected with a second end of the fifth capacitor, a second end of the fifth resistor, a first end of the twelfth resistor and the later-stage functional amplifier, and a second output end of the operational amplifier is connected with a second end of the sixth capacitor, a second end of the sixth resistor, a first end of the thirteenth resistor and the later-stage functional amplifier; a first end of the seventh capacitor is connected with a negative power supply pin of the operational amplifier, and a second end of the seventh capacitor is connected with a second end of the ninth capacitor and the ground wire; a first end of the eighth capacitor is connected with the first capacitor connecting pin of the operational amplifier, and a second end of the eighth capacitor is connected with the second capacitor connecting pin of the operational amplifier; a first end of the ninth capacitor is connected with a power supply, a first end of the seventh resistor and a power supply pin of the operational amplifier, and a second end of the ninth capacitor is connected with a ground wire; a first end of the seventh resistor is connected with a power supply and a power supply pin of the operational amplifier, and a second end of the seventh resistor is connected with an undervoltage protection pin of the operational amplifier and a first end of the fourteenth resistor; a second end of the twelfth resistor and a second end of the thirteenth resistor are connected with the same ground wire; a first end of the fourteenth resistor is connected with an undervoltage protection pin of the operational amplifier, and a second end of the fourteenth resistor is connected with a ground wire; the first end of the fifteenth resistor is connected with a controller and an enabling pin of the operational amplifier, and the second end of the fifteenth resistor is connected with the ground wire.
9. The vehicular audio linear amplification circuit according to claim 8, wherein the eighth capacitor is a flying capacitor for performing a process of supplying an operating negative pressure required by the operational amplifier; the controller controls turning on and off of the operational amplifier for performing a mute process.
10. An apparatus for linear amplification of car audio, comprising a power supply, the controller and the car audio linear amplification circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926878.0A CN110662137A (en) | 2019-09-27 | 2019-09-27 | Vehicle-mounted audio linear amplification circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910926878.0A CN110662137A (en) | 2019-09-27 | 2019-09-27 | Vehicle-mounted audio linear amplification circuit and device |
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| CN110662137A true CN110662137A (en) | 2020-01-07 |
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| CN201910926878.0A Pending CN110662137A (en) | 2019-09-27 | 2019-09-27 | Vehicle-mounted audio linear amplification circuit and device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588156A (en) * | 2008-05-19 | 2009-11-25 | 奇景光电股份有限公司 | Audio amplifier |
| CN102404670A (en) * | 2011-11-16 | 2012-04-04 | 北京经纬恒润科技有限公司 | Vehicle-mounted audio frequency circuit |
| CN202352339U (en) * | 2011-11-16 | 2012-07-25 | 北京经纬恒润科技有限公司 | Vehicle-mounted sound system |
| CN204993261U (en) * | 2015-09-30 | 2016-01-20 | 深圳市恒晨电器有限公司 | Linear amplifier circuit of on -vehicle audio frequency of single power low -voltage work |
| CN205179339U (en) * | 2015-11-25 | 2016-04-20 | 重庆惠科金扬科技有限公司 | Audio circuit structure |
-
2019
- 2019-09-27 CN CN201910926878.0A patent/CN110662137A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588156A (en) * | 2008-05-19 | 2009-11-25 | 奇景光电股份有限公司 | Audio amplifier |
| CN102404670A (en) * | 2011-11-16 | 2012-04-04 | 北京经纬恒润科技有限公司 | Vehicle-mounted audio frequency circuit |
| CN202352339U (en) * | 2011-11-16 | 2012-07-25 | 北京经纬恒润科技有限公司 | Vehicle-mounted sound system |
| CN204993261U (en) * | 2015-09-30 | 2016-01-20 | 深圳市恒晨电器有限公司 | Linear amplifier circuit of on -vehicle audio frequency of single power low -voltage work |
| CN205179339U (en) * | 2015-11-25 | 2016-04-20 | 重庆惠科金扬科技有限公司 | Audio circuit structure |
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Application publication date: 20200107 |