Video/audio signal channel switching device

Abstract

The invention discloses a video / audio signal channel switching device. The video / audio signal channel switching device includes several input channels, a matrix switching module and several output channels. Any one of the input channels collects the received video / audio signal acquisition device. The video / audio signal is converted into a pair of current mode logic CML format differential signals and transmitted to the matrix switching module. The matrix switching module switches and transmits a pair of CML format differential signals to any output channel, and any output channel converts a pair of CML format differential signals. It is restored to the video / audio signal output to the display device for display; through the above process, the signal is a pair of CML format differential signals during the transmission process, which greatly reduces the design difficulty of the differential signal routing of the corresponding PCB, and greatly reduces Number of differential signal I / O ports of the matrix switching module.

Description

technical field [0001] The invention relates to the field of digital video transmission, in particular to a video / audio signal channel switching device. Background technique [0002] At present, the video matrix is ​​used to switch and output the input video signal, which can switch the video signal from any channel to any output channel for display. HDMI (High Definition Multimedia Interface; high-definition multimedia interface) video matrix: when one HDMI video signal enters the input channel, it is usually converted into 4 pairs of TMDS (Transition Minimized Differential Signaling; minimized transmission differential signal) differential signals for transmission , so that the traces of 4 pairs of TMDS differential signals in each channel need to be designed with equal lengths on the PCB; and when one HDMI video signal is transmitted to the matrix switch chip, 4 pairs of differential signal I / O ports are required; when multiple channels of HDMI are input at the same time ...

AI Technical Summary

Problems solved by technology

HDMI (High Definition Multimedia Interface; high-definition multimedia interface) video matrix: when one HDMI video signal enters the input channel, it is usually converted into 4 pairs of TMDS (Transition Minimized Differential Signaling; minimized transmission differential signal) differential signals for transmission , so that the traces of 4 pairs of TMDS differential signals in each channel need to be designed with equal lengths on the PCB; and when one HDMI video signal is transmitted to the matrix switch chip, 4 pairs of differential signal I / O ports are required; when multiple channels of HDMI are input at the same time For video signals, the differential signal routing of the PCB will be very complicated; the number of differential signal I / O ports of the matrix switch chip will also be very large, such chips are very expensive and the production cost is very high

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