Data demultiplexer for decoding video data - generates signals to control decoding operations with control circuit supplied by video synchronising signal generator

摘要

A data demultiplexer (5), for use in the decoding of video data, has a data separator (21), a data time stamp video register (22), a data time stamp audio register (24), a system clock register (31), a system time clock register (26), a control circuit (28) and three comparators (23, 25, 32). The comparators provide gating of the registers dependent upon the timing signals. Outputs are provided to start the de-multiplexing cycle and the video and audio decoding operations. The control circuit receives an input from a video synchronising signal generator coupled to the video decoding stage. ADVANTAGE - Avoids distortion of video synchronising signal.