发明名称 |
Verfahren und Vorrichtung zum Durchführen einer Suche in einem Kodebuch im Hinblick auf das Kodieren eines Klangsignales, Zellkommunikationssystem, Zellnetzwerkelement und mobile Zell-Sender-/Empfänger-Einheit |
摘要 |
The present invention relates to a method and device for conducting a search in a codebook. This codebook consists of a set of pulse amplitude/position combinations each defining a number L of positions p and comprising both zero-amplitude pulses and non-zero-amplitude pulses assigned to respective positions p = 1, 2, ...L of the combination. Also, each non-zero-amplitude pulse assumes one of q possible amplitudes. According to the method, a subset of combinations is pre-selected from the codebook, and the search is limited to this subset to reduce complexity thereof. To pre-select the subset, an amplitude/position function is pre-established in relation to the sound signal. Pre-establishing the amplitude/position function includes pre-assigning one of the q possible amplitudes to each position p by (i) processing the sound signal to produce a backward-filtered target signal D and a pitch-removed residual signal R', (ii) calculating an amplitude estimate vector B in response to the signals D and R', and (iii) for each position p, quantizing an amplitude estimate Bp of the vector B to obtain the amplitude to be selected for that particular position p. |
申请公布号 |
DE19604273(C5) |
申请公布日期 |
2004.05.27 |
申请号 |
DE1996104273 |
申请日期 |
1996.02.06 |
申请人 |
UNIVERSITE DE SHERBROOKE, SHERBROOKE |
发明人 |
ADOUL, JEAN-PIERRE;LAFLAMME, CLAUDE |
分类号 |
G10L19/08;G10L;G10L13/00;G10L19/00;G10L19/04;G10L19/10;G10L19/12;H03M7/30;H03M7/36;H04B7/26;H04W88/02;(IPC1-7):G10L19/00 |
主分类号 |
G10L19/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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