The invention proposes to improve the performance of the conventional methods
of correcting channel transmission errors without increasing the redundance of
encoding the channel. It is particularly advantageous for the systems which may
be subjected to very poor transmission conditions such as radio interference or
any other noise phenomenon in the channel. The invention provides the addition
of a specific correction device after decoding the channel for detecting and correcting
the residual channel errors exceeding the correction capacity of the channel decoder.
It also proposes that the signal supplied by the decoder is a speech signal constituted
by a limited number of determined speech elements. The invention provides permanent
vocal recognition of the received signal with the aid of a dictionary of speech
elements for detecting the transmission errors and for correcting them by replacing
the erroneous part in the received signal by a synthesized part on the basis of
the speech dictionary.
