Hardware implementation of a 16 kbps subband coder using vector quantization

Author

Quackenbush, Schuyler

Author_Institution

AT&T Bell Lab., Murray Hill, NJ, USA

fYear

1988

fDate

11-14 Apr 1988

Firstpage

386

Abstract

A real-time 16 kb/s waveform coder which uses a combination of subband analysis/synthesis and vector quantization (VQ) to achieve a one-way communication delay of 20 ms is described. Gain-shape decomposition is used to vector-quantize the outputs of a generalized quadrature mirror filter bank. The short-time filter bank energy (gain) is used to dynamically allocate bits for coding the gain-normalized filter outputs (shape). The coder-decoder, implemented on a single AT&T DSP32 signal processing chip with 256 kB of off-chip memory for codebook storage, has a typical segmental SNR of 20.44 dB for sentences outside the training set

Keywords

decoding; encoding; speech analysis and processing; vocoders; 16 kbit/s; AT&T DSP32 signal processing chip; SNR; coder-decoder; gain-shape decomposition; hardware implementation; quadrature mirror filter bank; real time waveform coder; short-time filter bank energy; subband analysis/synthesis; subband coder; vector quantization; Bit rate; Delay; Filter bank; Finite impulse response filter; Hardware; Signal analysis; Signal processing algorithms; Speech analysis; Telephony; Vector quantization;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on

Conference_Location

New York, NY

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1988.196598

Filename

196598