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An Embedded Scalable Wideband Codec based on the GSM EFR Codec

Authors:
Jax, P.Geiser, B. ,  Schandl, S. ,  Taddei, H. ,  Vary, P.
Book Title:
Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
Volume:
I
Pages:
p.p. 5-8
Address:
Toulouse, France
Date:
May. 2006
Language:
English

Abstract

We present a technique to extend narrowband (NB) speech communication systems, using e.g. the GSM enhanced full rate (EFR) codec [1], 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.

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