Telephone set including a digital processing circuit for speech signals and method carried out in such an apparatus

摘要

The installation comprises a base (1) to which several portable handsets (C1,C2) may be linked. This base comprises a digital data processing unit (20) which processes information for the handsets. The digital data processing unit also forms a responder consisting of a flash type memory (30) which is intended to hold messages, operating without supplementary resources. The data processing unit comprises a differential coding / decoding system for effecting this coding in one format for the handsets, and one format for the responder. The message quality may be switched between high and low quality, with an identifier being stored to indicate the message quality in operation.