A communication system where the data rate of a given transmission has been encoded by a transmitter and is then used to adjust a plurality of convolutional decoders sharing common memory. The system uses common processing resources to provide up to four discrete channels having multi-rate convolutional...http://www.google.com.tw/patents/US6256339?utm_source=gb-gplus-share專利 US6256339 - Multichannel viterbi decoder