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頁籤選單縮合
| 題 名 | 改進CELP隨機碼本的搜尋方法之研究=A Study on Improved Search Method in CELP Stochastic Codebook of Speech Coding |
|---|---|
| 作 者 | 廖鴻儒; 嚴茂旭; | 書刊名 | 中華技術學院學報 |
| 卷 期 | 20 2000.03[民89.03] |
| 頁 次 | 頁88-99 |
| 分類號 | 312.23 |
| 關鍵詞 | 語音編碼; 調適碼本; 隨機碼本; 語音品質; 複雜度; Speech coding; Adaptive codebook; Stochastic codebook; Speech quality; Complexity; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | CELP(碼字激發線性預估)語音編碼模型中,調適碼本( Adaptive Codebook) 及隨機碼本( Stochastic Codebook )之搜尋時間,佔了編碼時間約 90% 以上,並且計算 複雜度頗高,使得編碼的計算負荷高居不下。本主題針對隨機碼本之隨機特性及碼本中各碼 字相關性之考量, 改進了搜尋方法,使得在編碼時之搜尋時間,由原來的 45% 降低至 35% ,而對區段訊雜比( SegSNR )只降約 0.5dB 之間, 另從主觀聽覺上,並不查覺合成語音 品質有惡化之趨勢,達到簡化編碼的複雜度之目標。 |
| 英文摘要 | The searching time of adaptive and stochastic codebooks used to 90% coding time in CELP (Code Excited Linear Prediction) of speech coding model, and have heavy computation complexity. In this paper, the new searching methods used random of codebook and correlation of codeword propertys to improved coding time about saving 10%. The segment SNR of objective measurement has few modification about decreased 0.5dB, and the speech quality is degrated severely in subjective measurement. In addition, those methods can reduce the more computation complexity. |
本系統中英文摘要資訊取自各篇刊載內容。