32 Kbps CCITT Compatible split band coding scheme

This paper deals with the application of the SVCS (Split band Voice Coding Scheme) concept to the coding of a PCM channel at half the rate of the presently used 64 kbps CCITT standard. This 32 kbps coder is shown to meet the specifications as recommended by the CCITT for a PCM channel operating at 64 kbps (8kHz sampling, 8 bits/sample A-Law). In addition, channel performances have been evaluated with and without transmission errors for different types of signals ranging from tones and modem signals to voice signals. It has been observed that transparency and apparent channel performances are not affected and that the behavior of the proposed 32 kbps is considerably less affected by transmission errors than the 64 kbps. Examples of taped results assuming different error rates on a voice signal with both the 32 kbps SVCS and the 64 kbps A-Law will be played at the conference.