Abstract: Known ADPCM transcoders use processors for coding and decoding, which are time and power consuming. Such a known ADPCM transcoder comprising one processor for coding and decoding can handle four channels, while according to DECT twelve channels need to be available, which requires three known ADPCM transcoders. By delaying signals in an ADPCM transcoder, it is no longer necessary to use processors, but, instead of said processors, logic elements can be used, which is very advantageous, because of such an ADPCM transcoder being able to handle sixteen channels.

Abstract: A method and device for finding a characteristic data group periodically inserted into a stream of successively transmitted data. Memory (7) stores temporarily a series of receive data corresponding to the minimal subset necessarily including the group looked for. Comparator (8) searches for a reference element relative to the group looked for in the preselected area including one of the modules into which the stored subset is divided. The search is continued module by module until a data group is identified identical to the reference element. Memory (11) memorizes the position of any group identical to the reference element in the module in which any such group was identified. A confirmation search eliminates group positions which are not found again subsequently, until there remains only the position of the last group present, which is deemed to be the reference looked for.