An Embedded Scalable Wideband Codec Based on the GSM EFR Codec

Author

Jax, Peter ; Geiser, Bernd ; Schandl, Stefan ; Taddei, Herve ; Vary, Peter

Author_Institution

Inst. of Commun. Syst. & Data Process., RWTH Aachen Univ.

Volume

1

fYear

2006

fDate

14-19 May 2006

Abstract

We present a technique to extend narrowband (NB) speech communication systems, using e.g. the GSM enhanced full rate (EFR) codec, with wideband (WB, 50-7000 Hz) capability. The limited acoustic bandwidth of narrowband speech coding is extended using a fairly coarse description of the missing high frequency band (3.4-7 kHz) in terms of temporal and spectral envelopes. The high-band parameters are quantized, transmitted and then used at the receiver side to regenerate the high frequency components. The parameter encoding is done by applying split vector quantization in a transformed domain. This quantization scheme can be scaled to match any given target bit rate. Several example configurations have been implemented and tested in MUSHRA-style listening tests

Keywords

broadband networks; cellular radio; linear predictive coding; speech codecs; speech coding; vector quantisation; voice communication; 50 to 7000 Hz; GSM EFR codec; GSM enhanced full rate codec; MUSHRA-style listening tests; acoustic bandwidth; bit rate; embedded scalable wideband codec; narrowband speech coding; narrowband speech communication systems; split vector quantization; Bandwidth; Codecs; Frequency; GSM; Narrowband; Niobium; Oral communication; Speech coding; Testing; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on

Conference_Location

Toulouse

ISSN

1520-6149

Print_ISBN

1-4244-0469-X

Type

conf

DOI

10.1109/ICASSP.2006.1659943

Filename

1659943