Transform subbands coding with channel error control

The authors report the development of an error control scheme for the adaptive subbands excited transform coding algorithm. It is a relatively simple source-channel coding scheme which takes into account the sensitivity of the compression parameters to transmission errors. The added computational complexity, encoding-decoding delay, and rate overhead are all relatively small. The compression algorithm, with error control and without, has been implemented and tested at a total bit rate of 16 kb/s. The channel used is the memoryless binary symmetric channel with error probability up to 0.01. The results show that under error-free conditions speech quality is unchanged. However, under error conditions the quality of speech produced by the protected algorithm is consistently better.<>