Combined harmonic and waveform coding of speech at low bit rates

Abstract

In this paper we present a new approach for speech coding, which combines frequency-domain harmonic coding for periodic and "noise like" unvoiced segments of speech with a time-domain waveform coder for transition signals. This hybrid coder requires special handling of the boundary between voiced and transition segments. We outline the details of a 4 kbps hybrid coder and present subjective quality test results of this coder.