Disclosed is a communication apparatus in which coding and/or decoding parameters for coding and/or decoding data can be performed in dialog fashion to make possible the optimum coding of transmitted data and the optimum reproduction of received data. The apparatus includes a coefficient adjusting unit...http://www.google.com.hk/patents/US5889549?utm_source=gb-gplus-share專利 US5889549 - Communication apparatus having coding/decoding means responsive to a settable coefficient
