Audio processing circuit and terminal equipment

Abstract

The invention discloses an audio processing circuit and terminal equipment. The audio processing circuit comprises a high impedance sampling network, an isolating network and a controller. The input end of the high impedance sampling network is communicated with analog audio signals. The output end of the high impedance sampling network is connected with the input end of the isolating network. The output end of the isolating network is connected with the input end of the controller. Therefore, after the high impedance sampling network is used for sampling audio signals, the isolating network is used for transmitting the sampled signals to the controller to make the controller test the outputted analog audio signals, the influence to the drive capacity of an analog audio circuit in the test process can be avoided. The analog grounding point is isolated from the digital grounding point to avoid the influence of digital signals to analog audio signals, therefore the audio signal quality is enhanced, and the user's experience is improved.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to an audio processing circuit and terminal equipment. Background technique [0002] With the development of science and technology and the improvement of terminal equipment manufacturing level, the functions of terminal equipment are becoming more and more diversified. Among them, the types of audio services provided by terminal equipment are gradually increasing, such as music playback and voice reminder services. When the terminal device provides audio services, displaying the current volume level, judging whether the current audio signal is normal, etc., all depend on the detection of the output voltage of the audio signal by the controller. [0003] In the prior art, the controller usually directly detects the output of the audio signal, and converts the analog audio signal through the analog-to-digital converter inside the controller to obtain the corresponding vol...

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Problems solved by technology

[0004] However, since the ground wire of the audio signal to be detected is connected to the analog ground in the circuit, while the ground wire of the controller is connected to the digital ground in the circuit, that is, the two are respectively connected to different grounds. In the above method, using the controller to directly detect the audio signal to be detected may cause the analog ground to be connected to the digital ground, thereby causing the digital signal to interfere with the output analog audio signal, affecting the output sound quality of the audio signal, and poor user experience

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