Publications – Details
An Embedded Scalable Wideband Codec based on the GSM EFR Codec
- Authors:
- Peter Jax, Bernd Geiser, Stefan Schandl, Hervé Taddei, and Peter Vary
- Book Title:
- Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
- Volume:
- I
- Venue:
- Toulouse, France
- Date:
- May 2006
- Pages:
- 5–8
- 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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