A controllable dual-channel audio power amplifier circuit

Abstract

The present invention is a controllable dual-channel audio power amplifier circuit, which is applied to the receiving audio output power amplifier circuit of a car intercom, and includes a microprocessor, a first analog switch, a second analog switch, a third analog switch, a fourth analog switch, a digital potentiometer, a dual-channel audio power amplifier, a first speaker and a second speaker. The present invention adopts a dual-channel audio power amplifier to realize dual-channel audio output, and realizes single audio dual-output stereo, dual audio single-output reverberation, dual audio dual-output reverberation stereo, single audio single-output sound, dual audio dual-channel independent output control and dual-channel independent volume control by using analog switches, digital potentiometers and microprocessors, thereby meeting the needs of car intercoms in different use environments and different users.

Description

Technical Field

[0001] The invention relates to a controllable dual-channel audio power amplifier circuit. Background Art

[0002] As a communication device, car walkie-talkies are widely used in various industries, environments and occasions. The high-quality sound quality of car walkie-talkies is pursued by more and more users. At the same time, with the widespread application of car walkie-talkies, there are different requirements for sound in some complex environments. Summary of the invention

[0003] The object of the present invention is to provide a controllable dual-channel audio power amplifier circuit which can meet the sound requirements of a vehicle-mounted intercom in different use environments and for different users.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A controllable dual-channel audio power amplifier circuit comprises a microprocessor, a first analog switch, a second analog switch, a third analog switch, a fourth analog switch, a digital potentiometer, a dual-channel audio power amplifier, a first speaker and a second speaker;

[0006] The microprocessor is in communication connection with the digital potentiometer, and the control output end of the microprocessor is connected to the control input end of the dual-channel audio power amplifier;

[0007] The output of the microprocessor is divided into four paths, which are respectively connected to the input ends of the first analog switch, the second analog switch, the third analog switch, and the fourth analog switch. An audio signal is simultaneously input into the first analog switch and the second analog switch, and another audio signal is simultaneously input into the third analog switch and the fourth analog switch. The output ends of the first analog switch and the third analog switch are commonly connected to the first input end of the digital potentiometer, and the output ends of the second analog switch and the fourth analog switch are commonly connected to the second input end of the digital potentiometer. The first output end and the second output end of the digital potentiometer are respectively connected to the first input end and the second input end of the dual-channel audio power amplifier, and the first output end and the second output end of the dual-channel audio power amplifier are respectively connected to the first speaker and the second speaker.

[0008] After adopting the above scheme, a controllable dual-channel audio power amplifier circuit of the present invention adopts a dual-channel audio power amplifier to realize dual-channel audio output, and realizes single-audio dual-output stereo, dual-audio single-output reverberation, dual-audio dual-output reverberation stereo, single-audio single-output sound, dual-audio dual-channel independent output control and dual-channel independent volume control by using an analog switch, a digital potentiometer and a microprocessor, thereby meeting the needs of vehicle-mounted intercoms in different usage environments and for different users. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a circuit principle block diagram of the present invention. DETAILED DESCRIPTION

[0010] The present invention provides a controllable dual-channel audio power amplifier circuit, such as Figure 1 As shown, it includes a microprocessor 1, a first analog switch 2, a second analog switch 3, a third analog switch 4, a fourth analog switch 5, a digital potentiometer 6, a dual-channel audio power amplifier 7, a first speaker 8 and a second speaker 9.

[0011] The microprocessor 1 is in communication connection with the digital potentiometer 6 , and a control output end of the microprocessor 1 is connected to a control input end of a dual-channel audio power amplifier 7 .

[0012] The output of the microprocessor 1 is divided into four paths, which are respectively connected to the input ends of the first analog switch 2, the second analog switch 3, the third analog switch 4, and the fourth analog switch 5. The demodulated audio signal 1 from the car intercom is simultaneously input into the first analog switch 2 and the second analog switch 3, and the demodulated audio signal 2 from the car intercom is simultaneously input into the third analog switch 4 and the fourth analog switch 5. The output ends of the first analog switch 2 and the third analog switch 4 are commonly connected to the first input end (IN1) of the digital potentiometer 6, and the output ends of the second analog switch 3 and the fourth analog switch 5 are commonly connected to the second input end (IN1) of the digital potentiometer 6. The first output end (OUT1) and the second output end (OUT2) of the digital potentiometer 6 are respectively connected to the first input end (INV1) and the second input end (INV2) of the dual-channel audio power amplifier 7. The first output end (OUTV1) and the second output end (OUTV2) of the dual-channel audio power amplifier 7 are respectively connected to the first speaker and the second speaker.

[0013] In the present invention, the microprocessor 1 adopts a conventional microprocessor in the art, for example, a microprocessor of model R5F212B8SNFP can be adopted.

[0014] The digital potentiometer 6 in the present invention adopts a conventional digital potentiometer in the art, such as a dual-channel electronic volume controller of model M62429, which is controlled by two-wire serial data, has a volume adjustment range of 0 to -83dB, and a control accuracy of 1dB.

[0015] In the present invention, the dual-channel audio power amplifier 7 adopts a conventional dual-channel audio power amplifier in the art, such as a dual-channel audio power amplifier integrated chip model YD1517P, which has the advantages of dual input and dual output, wide frequency response, low distortion, large dynamic range and output power.

[0016] The working principle of the present invention is as follows:

[0017] like Figure 1 As shown, audio signal one is simultaneously input into the first analog switch 2 and the second analog switch 3, and audio signal two is simultaneously input into the third analog switch 4 and the fourth analog switch 5. The user realizes different outputs of audio channel one and audio channel two through conventional menu settings of the vehicle intercom and conventional control of the microprocessor.

[0018] like Figure 1 As shown, the two-way audio signals outputted by the first, second, third and fourth analog switches enter the digital potentiometer 6 through the two input ports (IN1 and IN2) of the digital potentiometer 6, and the user controls the volume of the two-way audio signals through the microprocessor 1 through the menu setting of the vehicle intercom, and outputs through the two output ports (OUT1 and OUT2) of the digital potentiometer 6. The attenuation data is found out by the table lookup method through the volume level preset in the microprocessor 1, and then the microprocessor 1 sends the corresponding data to the digital potentiometer 6 for execution. Among them, the microprocessor 1 presets the volume level, and controls the digital potentiometer by finding the attenuation data through the table lookup method, which is a well-known control method in the art.

[0019] like Figure 1 As shown, the two-way audio signals output by the digital potentiometer 6 enter the dual-channel audio power amplifier 7 through the two input ports (-INV1 and -INV2) of the dual-channel audio power amplifier 7, and the amplified audio signals are output by the two output ports (OUTV1 and OUTV2) of the dual-channel audio power amplifier 7 to drive the first speaker 8 and the second speaker 9.

[0020] The controllable dual-channel audio power amplifier circuit of the present invention can realize the following functions:

[0021] 1. When the first analog switch 2 and the second analog switch 3 are in the on state, and the third analog switch 4 and the fourth analog switch 5 are in the off state, the audio signal 1 enters the audio channel 1 and the audio channel 2 at the same time, and finally the audio signal 1 is output from the first speaker 8 and the second speaker 9 at the same time, realizing single audio dual output stereo;

[0022] Similarly, when the third analog switch 4 and the fourth analog switch 5 are in the on state, and the first analog switch 2 and the third analog switch 3 are in the off state, the audio signal 2 enters the audio channel 1 and the audio channel 2 at the same time, and finally the audio signal 2 is outputted from the first speaker 8 and the second speaker 9 at the same time, realizing single audio dual-channel stereo;

[0023] 2. When the first analog switch 2 and the third analog switch 4 are in the on state, the second analog switch 3 and the fourth analog switch 5 are in the off state, or the second analog switch 3 and the fourth analog switch 5 are in the on state, and the first analog switch 2 and the third analog switch 4 are in the off state, the mixed signal composed of the audio signal 1 and the audio signal 2 enters the audio channel 1 or the audio channel 2, and finally the mixed signal is output from the first speaker 8 or the second speaker 9, realizing dual-audio single-output reverberation;

[0024] 3. When the first analog switch 2, the second analog switch 3, the third analog switch 4 and the fourth analog switch 5 are all in the on state, the mixed signal composed of the audio signal 1 and the audio signal 2 enters the audio channel 1 and the audio channel 2 at the same time, and the final mixed audio signal is output from the first speaker 8 and the second speaker 9 at the same time, realizing dual-audio dual-output reverberation stereo;

[0025] 4. When any one of the analog switches is in the on state and the other analog switches are in the off state, the single audio signal of the audio signal 1 or the audio signal 2 enters the audio channel 1 or the audio channel 2, and finally the single audio signal is output from the first speaker 8 or the second speaker 9, realizing a single audio single output sound;

[0026] 5. When the first analog switch 2 and the fourth analog switch 5 are in the on state, and the second analog switch 3 and the third analog switch 4 are in the off state, audio signal 1 enters audio channel 1, and audio signal 2 enters audio channel 2. Finally, audio signal 1 is output from the first speaker 8, and audio signal 2 is output from the second speaker 9, thereby realizing dual-audio dual-channel independent output control.

Claims

1. A controllable dual-channel audio power amplifier circuit, characterized in that: It includes a microprocessor, a first analog switch, a second analog switch, a third analog switch, a fourth analog switch, a digital potentiometer, a dual-channel audio power amplifier, a first speaker and a second speaker; The microprocessor is in communication connection with the digital potentiometer, and the control output end of the microprocessor is connected to the control input end of the dual-channel audio power amplifier; The output of the microprocessor is divided into four paths, which are respectively connected to the input ends of the first analog switch, the second analog switch, the third analog switch, and the fourth analog switch. An audio signal is simultaneously input into the first analog switch and the second analog switch, and another audio signal is simultaneously input into the third analog switch and the fourth analog switch. The output ends of the first analog switch and the third analog switch are commonly connected to the first input end of the digital potentiometer, and the output ends of the second analog switch and the fourth analog switch are commonly connected to the second input end of the digital potentiometer. The first output end and the second output end of the digital potentiometer are respectively connected to the first input end and the second input end of the dual-channel audio power amplifier, and the first output end and the second output end of the dual-channel audio power amplifier are respectively connected to the first speaker and the second speaker.

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