SAMPLING RATE VERSUS QUANTIZATION IN SPEECH CODERS

The use of Kalman filtering techniques to reconstruct down-sampled spe ech signals is investigated. We compare a full-sampled, coarsely quant ised speech coding system with a down-sampled, finely quantised speech coding system transmitting at the same bit-rate. Testing reveals that the down-sampled system can outperform the full-sampled system. Sampl e rate, sample accuracy and decoding delay are traded to achieve impro vements at a fixed bit-rate. (C) 1997 Elsevier Science B.V.