SUBBAND ADPCM VOICE ENCODING AND DECODING

摘要

A wireless telephone system comprises a base transceiver having a base transmitter and base receiver, and a plurality of wireless handsets. Each transmitter of the system comprises a transmitter encoder for encoding an input signal having an input sample rate, to be transmitted to a receiver of the system. The transmitter encoder comprises a filter bank for separating the input signal into a plurality of subband signals, each subband covering a different frequency range; and a plurality of ADPCM encoders, one for each subband, for encoding each subband signal at a number of bits per sample according to the relative importance of the subband.