System and signal processing device and of high definition of the mac / packet, which are compatible with a transmission over a wide band and in the narrow band.

摘要

The invention relates to a transmission system, which is compatible with the transmission of signals hdmac through a channel of the mac / packet, either to a wide band (typically a satellite channel in accordance with the recommendation of the camr 77), or with a narrow band (typically a transmission channel terrestrial radio or cord). br / according to the invention, the transmitted signal has a component of the digital sounds and service data encoded by duobinary type d2 identical over a wide band and in the narrow band, an analog video component distinct over a wide band and in the narrow band, which for the narrow band transmission, is sampled at a sampling frequency equal to x% of the sampling frequency of the video signal transmitted over a wide band, then subjected to a filtering in a nyquist filter cut-off frequency equal to x% of the cut-off frequency of the nyquist filter used in a wide band, before the filtered samples are finally reread, to compression, at a frequency equal to x% of the reading frequency of the samples in a wide band.