A digital coder for wideband audio applications.
01 January 1986
This memorandum describes a digital coder designed to provide superior performance for wideband audio applications at reduced transmission bit rates. The coding algorithm is based on an ADPCM that incorporates a unique prediction filter developed for this application. The digital coder is implemented on a single DSP chip and operates at transmission data rates up to 64 kb/s corresponding to an audio bandwidth of 7.5 kHz.