音頻編碼中高頻殘差重構(gòu)算法.pdf

1、——————————蘭里—jIYlllll／12／／llllloI／lll6／ll／／18llllrf5fllfll6lrl／115lfl刪摘要近年來(lái)，高質(zhì)量低碼率已經(jīng)成為音頻編碼領(lǐng)域的一個(gè)目標(biāo)，高質(zhì)量低碼率音頻編碼關(guān)鍵技術(shù)雖然得到了廣泛發(fā)展，但是數(shù)字音頻業(yè)務(wù)的強(qiáng)勁增長(zhǎng)迫切需要更高的音頻質(zhì)量和更低的編碼比特率。解決這個(gè)問(wèn)題的一個(gè)很好的方案就是高頻重建技術(shù)。本文回顧了典型的高頻重建技術(shù)，并提出了一種新的高頻重建技術(shù)——高頻殘差復(fù)制算法。這

2、種算法只需要根據(jù)殘差低頻部分和反應(yīng)殘差高頻部分的少量附加參數(shù)，就可以復(fù)制出與原始?xì)埐铑l譜的高頻部分十分相似的高頻殘差。因此，這種算法在低比特率下能得到更高的音頻質(zhì)量。本文首先介紹了高頻殘差復(fù)制算法的原理，然后分析了高頻殘差復(fù)制算法的相關(guān)關(guān)鍵技術(shù)。本文最后給出了相關(guān)的質(zhì)量評(píng)估和測(cè)試結(jié)果，這些結(jié)果說(shuō)明了本文提出的高頻殘差復(fù)制算法可以精確完整的對(duì)殘差信號(hào)的高頻部分進(jìn)行重構(gòu)，并且重構(gòu)出的音頻文件音質(zhì)很好。高頻殘差復(fù)制算法在高頻重建技術(shù)中體現(xiàn)出了

3、自身的優(yōu)點(diǎn)。雖然在某種情況下，其性能并不是非常優(yōu)越的，但這種算法的潛在價(jià)值卻不容忽視，對(duì)其進(jìn)行進(jìn)一步發(fā)掘和研究相信會(huì)很有意義。關(guān)鍵詞：音頻編碼高質(zhì)量低碼率高頻重建高頻殘差復(fù)制AbstractRecentyears，highqualityandlowbitratehasbeenthetargetsofaudiocodingVariouskeytechnologiesofhighq砌ityandlowbitrateaudiocodingha

4、vebeendevelopedbutthestronggrowthofdigitalaudiobusinessisingreatneedofhighaudioqualityandlowbitrateHigllFrequencyReconstructiontechnologyisagoodsolutionforthetargetsmentionedaboveThispaperreviewssometypicalalgorithmsofhi

5、曲frequencyreconstructiontechnologyandproposesanovelhighfrequencyreconstructiontechnology—Hi曲FrequencyResidueReplication(HFRR)algorithmThisalgorithmisableteconstructthehighfrequencyresiduecomponentsverysimilartotheorigina

6、lresiduespectrumonlywiththelowfrequencyresiduecomponentsandafewadditionalparametersreflectingthefeathersofthehighfrequencyresiduesignalsThus，thisalgorithmallowshigheraudioqualityatlowbitratesInthispapertheprincipleoftheH

7、FRRalgorithmisintroducedfnstandthenthekeytechnologiesofHFRRareanalysesSomequalityevaluationsandtestingresultsalepresentedintheendofthepaper，whichdemonstratesthattheHFRRalgorithmproposedinthispapercanreconstructthehi曲freq

8、uencyresidueaccuratelyandcompletelyandthereconstructedaudiosoundgreatTheperformancesoftheHFRRalgorithmhaveshownsomeimprovementsandadvantagesforhighfrequencyreconstructiontechnologyEventheyarenotalwaysgoodinanycases，butst