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標題Title: A Fast Adaptive-Codebook Search Algorithm for G.723.1 Speech Coder
作者Authors: 王嘉宇
上傳單位Department: 資訊工程系
上傳時間Date: 2009-10-27
上傳者Author: 王嘉宇
審核單位Department: 資訊工程系
審核老師Teacher: 林榮三
檔案類型Categories: 課堂報告In-class Report
關鍵詞Keyword: Fast adaptive-codebook search, G.723.1 speech coder, sequential search with multiple pitch candidates
摘要Abstract: This letter presents a new fast search algorithm for the multitap adaptive codebook used in the G.723.1 standard speech coder. In contrast with the standard method that a closed-loop pitch lag and gains for a fifth-order pitch predictor are searched simultaneously, the proposed algorithm adopts a sequential and restricted approach to determine the parameters. In other words, the proposed scheme first determines a couple of pitch lag candidates using a first-order pitch predictor and then computes the pitch gains of the fifth-order predictor within a restricted search area. Experimental results confirm that the proposed algorithm reduces the total complexity by 30.69% in the encoding process and provides speech quality equivalent to the standard method.

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2009_10_f34b1a5e.ppt 1202Kb ppt 1488 271
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