System zum Empfang und zur Dekodierung von digitalen Signalen entsprechend zweier Bildauflösungen

摘要

System for receiving and decoding digital signals according to two image definition levels, comprising: (A) a transmission channel decoding subassembly (2), itself comprising first and second channel decoders (21, 22) and a changeover switch (23) for selecting one of them; (B) a source decoding subassembly (4), for decoding the highest definition level signals or the lowest definition level signals; (C) a device (5) for displaying the decoded signals which are available at the output of this subassembly (4); (D) on a second output of the subassembly (4), a device (61) for error detection during the source decoding, followed, in series, by a decision circuit (7) for controlling the changeover switch according to the output of the said error-detecting device, as well as for controlling the changing of the decoding subassembly from one of the two source decoding modes to the other. Application: television signal receivers according to the MPEG standard. <IMAGE>