I2S ringing wipe circuit

Abstract

The present invention discloses a I2S ringing eliminating circuit, which eliminates the ringing cacophony generated by the I2S circuit of TV as well as DVD, and improves sound output effect. To the I2S ringing eliminating circuit of the present invention, the audio data serial data pin of the I2S source connects to the audio data serial data pin of a digital-analog transformation integrated circuit by a first resistance, the I2S source and the audio serial data pin input end of the digital-analog transformation circuit connect to one end of the resistance with the mode of initiative connecting in parallel, the other end of the resistance connects to the power supply voltage of the circuit. Compared with the existing technology, the audio serial data pin input end of the digital-analog transformation circuit connects with the resistance with the mode of initiative connecting in parallel, and consumes the ringing harmful signal among the I2S data signal on the resistance with power consumption mode, so as to reach eliminate ringing, and to eliminate cacophony of the audio signal finally.

Description

technical field [0001] The invention relates to a TV set, DVD and set-top box circuit, in particular to an audio data transmission bus circuit in the TV set, DVD and set-top box. Background technique [0002] In the audio data transmission bus circuit between TV sets, DVDs and set-top box digital audio equipment, the prior art I2S line (I2S bus: Inter-IC Sound Bus), especially the I2S source-to-load analog-to-digital converter on the data line The serial termination method is adopted between the DACs. As shown in Figure 1, a resistor is connected in series on the I2S line to match the impedance of the I2S source end to reduce signal reflection. The impedance plus the series resistance is approximately equal to the transmission line impedance. In actual engineering applications, it is difficult to achieve accurate impedance matching, and signal reflection still exists, and may be reflected multiple times to form ringing. The audio data serial data input pin SDIN of the I2S ...

AI Technical Summary

Problems solved by technology

In practical engineering applications, it is difficult to achieve accurate impedance matching, signal reflection still exists, and may be reflected multiple times, forming ringing

The audio data serial data input pin SDIN of the I2S signal is used as the data line of the digital audio signal. If there is ringing on the data line, the data received by the SDIN input terminal of the digital-to-analog conversion integrated circuit DAC will be inaccurate and may cause digital The analog audio signal after analog DA conversion carries this ringing interference, and the interfered analog audio signal will become noise after power amplification, affecting the sound output effect of TV and DVD

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