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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Sekchin Chang Eung-Bae Kim Ki-Cheol Han |
| Copyright Year | 1997 |
| Description | Author affiliation: Mobile Commun. Syst. Dept., Electron. & Telecommun. Res. Inst., Taejon, South Korea (Sekchin Chang) |
| Abstract | This paper describes a speech coder with low complexity and optimized codebook. A 13 kb/s speech coder is used for upbanded IS-95, a personal communications system (PCS) standard. This speech coder is called Qualcomm code excited linear prediction (QCELP). The QCELP coder uses the closed-loop search for all pitch delays in each pitch subframe. This pitch search requires a large computation time. The coder has two codebooks, each of which consists of 128 circular entries which are generated from a Gaussian source. This kind of circular Gaussian codebook reduces the storage complexity, but does not have the speech property. We used a two-stage pitch analysis for complexity reduction and an optimized codebook, which has a speech property and a circular structure, for better Korean speech quality. The improved coder shows a better performance than that of the original QCELP coder in terms of complexity and speech quality. |
| Starting Page | 621 |
| Ending Page | 624 |
| File Size | 376229 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780343654 |
| DOI | 10.1109/TENCON.1997.648282 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1997-12-04 |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Delay Personal communication networks Code standards Speech analysis Multiaccess communication Time division multiple access Telephony Land mobile radio Mobile communication Communication standards |
| Content Type | Text |
| Resource Type | Article |
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