High performance half-rate encoding apparatus and method for...

H - Electricity – 04 – L

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H04L 1/00 (2006.01) H04L 1/08 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2346104

In a transmitter for transmitting communication signals across a radio channel, an improved encoder includes a half-rate encoder receiving a digitzed speech signal and generating a compressed bit stream at half-rate, and a signal expander receiving the compressed bit stream and generating an expanded bit stream at full-rate for transmission across a radio channel. An improved receiver, receives the transmitted communication signal which is selected from the group consisting of (a) a conventional full-rate encoded digitized speech signal, and (b) a half-rate encoded digitized speech signal including the expanded bit stream. The improved receiver includes a full-rate equalizer, a half-rate equalizer, and a switch initially routing the received digitized speech signal to the full-rate equalizer, wherein the full-rate equalizer demodulates the received digitized speech signal producing a full-rate demodulated signal and dibits of soft information corresponding to the full- rate demodulated signal. An analyzer analyzes the dibits of soft information and controls the switch to route the received digitized speech signal to one of the full-rate and half-rate equalizers based upon the analysis.

Dans un émetteur conçu pour émettre des signaux de communications par un canal radio, un codeur amélioré comprend un codeur à demi-débit recevant un signal vocal numérisé et produisant un train binaire compressé à demi-débit, et un extenseur de signal recevant le train binaire compressé et produisant un train binaire étendu à débit complet pour transmission par canal radio. Un récepteur amélioré reçoit le signal de communications émis, choisit du groupe constitué par (a) un signal vocal numérisé codé à débit complet classique et, (b) un signal vocal numérisé codé à demi-débit comprenant le train binaire étendu. Le récepteur amélioré comprend un égalisateur à débit complet, un égalisateur à demi-débit et un commutateur acheminant initialement le signal vocal numérisé reçu vers l'égalisateur à débit complet, ce dernier démodulant le signal vocal numérisé reçu pour produire un signal démodulé à débit complet et des dibits d'informations temporaires correspondant au signal démodulé à débit complet. Un analyseur analyse les dibits d'informations temporaires et commande au commutateur d'acheminer le signal vocal numérisé reçu vers l'un des égalisateurs à débit complet et à demi-débit en fonction de l'analyse.

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