8kb-s共軛結(jié)構(gòu)代數(shù)碼激勵(lì)線性預(yù)測(cè)(CS-ACELP)語(yǔ)音編碼的研究.pdf

1、北方交通大學(xué)碩士學(xué)位論文8kbs共軛結(jié)構(gòu)代數(shù)碼激勵(lì)線性預(yù)測(cè)(CSACELP)語(yǔ)音編碼的研究姓名：蘭娟申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：信號(hào)與信息處理指導(dǎo)教師：林碧琴19990201北方交通大學(xué)碩士研究生學(xué)位論文英文摘要TheresearchofAn8kb／sConjugate——StructureAlgebraicCELP(CS—ACELP)SpeechCodingAbstractThe8kb／sconjugate—structurealgebr

2、aic—code—excited1inear—predJction(CS書ELP)codingisresearchedinthisthesis，anditisanewkindofthespeechcodingalgorithmbasedonaCELPcodingmodelUsuallYtheeomputationalcomplexityforCELPisquite1arge，thereforethealgorithmofCS—ACELP

3、usesthespecialcodebookstruttureandcodingtechnique，whichcansimplifythesearchandreducethecodingbit—ratewhilemaintainingevenimprovingitscodingperformanceA1lthesearethenucleusofthealgorithmasfoiIow：thelinearspectralpair【LSP)

4、analysisandthetwo—stagevectorquantization(VQ)withasHcstructure：thepitchsearchwithatWO—‘stagestrategyincludingtheopened——loopandclosed——loopanalysiswithfractionalpitchinterpolation：thealgebraicstructureofthefixed—codebook

5、anditsfastsearchprocedure：andtheconjugatestructureofthegainsVQcodebookAsaresultthisnewcodingcanrealizeahighqualitvreconstructedspeechatthelowbit—rate8kb／7swhfchmeetstheneedsofthefuturetelecommunicationsandwillbeemployedi

6、nthewideapplicationsThisthesismainlyconsiStSoffivechaptersThefirstpartis計(jì)1eintroductionandtheresearchbackgroundandmeaningarealsoshownThenthedigitalspeechcompressjngcodingisdiscussedinthesecondchapter，andthespeechdigitalm