Design of a 4.8/9.6 kbps baseband LPC coder using split-band and vector quantization

This paper presents our recent work on the development of a 4.8/9.6 kbps baseband LPC coder, using vector quantization in both vocal tract modelling and residual representation. The vector quantizing approach has been proved highly effective for achieving good quality in voice communications applications at low and very-low data rates. Here we focus on the most important aspects in designing a baseband coder, with the goal of maximizing the subjective quality. Results of some preliminary experiments, performed on a FPS-120 array processor connected to a mini PDP11/60, are described. Taped demonstrations will be played at the Conference.