A LOW-DELAY TRANSFORM DOMAIN APPROACH TO TRELLIS-CODED QUANTIZATION

In this paper we propose a new transform domain coding technique calle d transform trellis coded quantization (TTCQ) that is based on the tre llis coded quantization technique recently proposed where Ungerboeck's amplitude modulation trellises and set partitioning ideas are used fo r source coding. We combine the proposed technique with a transform do main formulation far small frame sizes obtaining a transform domain sc heme suitable for low-delay speech coding. We have applied this scheme to the coding of 7 kHz wideband speech, studying its performance for several discrete transforms and comparing it with a predictive version of the trellis coded quantization technique for different bit rates a nd number of states in the trellis.