DEVICE DEMODULATING AND DECODING VIDEO SIGNALS Russian patent published in 2001 - IPC

FIELD: digital processing of signals. SUBSTANCE: invention deals with demodulation and decoding of video signals encoded in correspondence with different standards for satellite or ground communication. Proposed device incorporates adaptive demodulator and adaptive decoder to receive demodulated and decoded output data from video signal encoded for satellite, land or cable transmission. Demodulator reconstructs demodulated output data with use of adaptive reconstruction circuit of synchronization and adaptive reconstruction circuit of carrier which includes selected limiter. In addition automatic gain control circuit of demodulator generates output signal controlling gain factor as function of difference between signals received before and after limiter. Demodulator can have detector of quality of signal that employs signals of reconstruction circuit of carrier to evaluate error in demodulated output data. Detector generates output signal decoded by Viterbi algorithm from demodulated output data with the use of selected decoder of code transmission rate. EFFECT: expanded functional capabilities by way of provision for processing of different types of function of demodulation and decoding. 18 cl, 6 dwg