Publications – Details
High Quality Coding of Wideband Speech at 24 kbit/s
- Authors:
- Jürgen Paulus, Christiane Antweiler, and Christian G. Gerlach
- Book Title:
- Proceedings of European Conference on Speech Communication and Technology (EUROSPEECH)
- Venue:
- Berlin, Germany
- Event Date:
- 21.-23.9.1993
- Organization:
- ESCA
- Date:
- Sept. 1993
- Pages:
- 110–113
- Language:
- English
Abstract
This paper proposes a Wideband-CELP-Coding scheme (bandwidth 7 kHz) at 24 kbit/s. The codec introduces a delay of just 10 ms. This fulfills the requirements of a possible codec candidate for wideband speech coding within DECT or video applications. The analysis-by-synthesis structure of the proposed Wideband-CELP-Codec includes an alternative LPC analysis concept, where the autocorrelation function is calculated recursively. This special LPC scheme provides an improved speech quality and a reduction of computational complexity in comparison to conventional algorithms for the LPC analysis. In addition a stochastic sparse codebook with extremely low computational effort is presented, comparable to the one presented in resulting in a neglectable amount of storage. The CCITT G.722 standard was applied as reference codec, in order to compare the new coding scheme in terms of subjective quality. With the proposed Wideband-CELP a speech quality is achieved, which is equivalent to the reference codec operating at 56 kbit/s.
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