頁籤選單縮合
題名 | 以DSP晶片實現低位元率語音編碼器 |
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作者姓名(中文) | 游竹; | 書刊名 | 宜蘭農工學報 |
卷期 | 11 1995.12[民84.12] |
頁次 | 頁135-147 |
分類號 | 312.23 |
關鍵詞 | 字碼激發線性預測編碼; 語音壓縮; 語音編碼; CELP; DSP; Speech coding; Stochastic codebook; |
語文 | 中文(Chinese) |
中文摘要 | 字碼激發線性預測編碼(Code-Excited Linear Prediction,CELP)是目前屬於 位元率極低語音品質尚佳之語音壓縮技術,本文使用CELP之位元率為4.5Kbps,但是它缺點 在於碼本(codebook)搜尋步驟計算複雜度過高,使得CELP不易做即時語音編碼處理,因此 本文重在實際以16.67MIPS的DSP做語音編碼,但為配合DSP的運算速率因而降低隨機碼本的 大小,以縮短碼本的搜尋時間達到即時語音編碼處理。 |
英文摘要 | At present, Code-Exited Linear Prediction (CELP) is a technique associated with low bit rate but with satisfactory speech quality. The bit rate of CELP in this paper is 4.5K bps. Because of the highly complicated search procedure for codebook, CELP can not perform real-time speech coding processing. Therefore, this paper emphasizes the DSP implementation of speech coding in 16.67 MIPS. For the compatibility of both DSP's computing speed and time consumed by search steps of codebook, the stochastic codebook size must be decremented. The real-time search coding condition can be reached provided that the time spent in search process can be minimized. |
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