It is provided a digital media playing device, comprising a storage for storing a media file; an audio decoder for generating digital signal for audio from the media file; a digital to analog converter for converting digital signal for audio to analog signal and providing the analog signal to a power amplifier; and the power amplifier for amplifying the analog signal; wherein,an optical coupler is added between the audio decoder and the digital to analog converter,and the optical coupler transmits the digital signal for audio from the audio decoder to the digital to analog converter by using light signal.

Digital media playing device

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.

Audio processing circuit and terminal equipment

The invention discloses a high-definition player comprising an input end, a preposition processing stage circuit, an analog circuit, an analog-digital converter, a digital circuit and an output end, and a linear isolation amplifier is connected between the preposition processing stage circuit and the analog-digital converter. The high-definition player connects the linear isolation amplifier between the preposition processing stage circuit and the analog-digital converter, thereby blocking common mode interference and differential mode interference from the preposition circuit part and improving the anti-interference performance; in addition, the high-definition player further connects a radiator between a main chip and an aluminum alloy housing, thereby having no need of a fan, having better heat dissipation effect and leading the stability of the high-definition player to be stronger.

High-definition player

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High-definition player