北京工业大学学报
北京工業大學學報
북경공업대학학보
JOURNAL OF BEIJING POLYTECHNIC UNIVERSITY
2004年
2期
161-165
,共5页
语音编码%码激励线性预测%多路径码书搜索
語音編碼%碼激勵線性預測%多路徑碼書搜索
어음편마%마격려선성예측%다로경마서수색
speech coding%code-excited linear prediction(CELP)%multi-path codebook search
为了解决高质量散布脉冲码激励线性预测语音编码算法中的代数码书搜索复杂度高的问题,通过在候选的脉冲位置上保持目标信号和脉冲响应的相对最大相关,提出了一种不降低主观话音质量的多路径散布脉冲搜索算法,计算负载从19.66 MOPS减少到0.0694 MOPS,大幅度减轻了散布脉冲码书的计算负载.主观和客观听力测试表明,算法的改进前后的合成语音质量没有感性差别.
為瞭解決高質量散佈脈遲碼激勵線性預測語音編碼算法中的代數碼書搜索複雜度高的問題,通過在候選的脈遲位置上保持目標信號和脈遲響應的相對最大相關,提齣瞭一種不降低主觀話音質量的多路徑散佈脈遲搜索算法,計算負載從19.66 MOPS減少到0.0694 MOPS,大幅度減輕瞭散佈脈遲碼書的計算負載.主觀和客觀聽力測試錶明,算法的改進前後的閤成語音質量沒有感性差彆.
위료해결고질량산포맥충마격려선성예측어음편마산법중적대수마서수색복잡도고적문제,통과재후선적맥충위치상보지목표신호화맥충향응적상대최대상관,제출료일충불강저주관화음질량적다로경산포맥충수색산법,계산부재종19.66 MOPS감소도0.0694 MOPS,대폭도감경료산포맥충마서적계산부재.주관화객관은력측시표명,산법적개진전후적합성어음질량몰유감성차별.
In order to reduce high complexity for algebraic codebook search in high quality dispersed-pulse CELP speech coding, a multi-path algorithm was proposed in DP-CELP coder at 4 kb/s by keeping relatively maximum correlation between target signal and impulse response in the possible position of pulse. The complexity of the algebraic codebook search is reduced to 0.069 4 MOPS from 19.66 MOPS by using this method. Subjective and objective heating test indicates that the reconstructed speech quality has no perceptual difference from the original one.
