音頻編碼中瞬態(tài)信號的時(shí)域檢測方法
Time-Domain Detection Method of Transient Signals in Audio Coding
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摘要: 在低比特率音頻感覺編碼中，預(yù)回聲失真更為突出，而對其處理的前提是瞬態(tài)信號的有效檢測。在時(shí)域，基于峰值功率與平均功率之比( PMR)定義了瞬態(tài)強(qiáng)度，并以此為判決函數(shù)提出一種新的瞬態(tài)信號時(shí)域檢測算法。由于考慮了時(shí)域掩蔽效應(yīng)來設(shè)置檢測門限和有效瞬態(tài)點(diǎn)間隔，非常適用于感覺音頻編碼。與當(dāng)前典型的基于感覺熵的頻域瞬態(tài)檢測方法相比，具有時(shí)間分辨率高、準(zhǔn)確和算法簡單等優(yōu)點(diǎn)。
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關(guān)鍵詞:
- 語音處理;瞬態(tài)檢測;預(yù)回聲失真;音頻感覺編碼
Abstract: In perceptual audio coding with low bit rate application, the pre-echo artifact is more distinct, and the effective detection of transient signals is the precondition. Transient intensity is defined in term of the Peak-Mean power Ratio(PMR), accordingly, a novel detecting algorithm of transient signals on time domain is presented while PMR is used as a criterion function. Because of considering the temporal masking effects to set up a threshold and the valid hop size of transient points, this method is very suitable for perceptual audio coding. When compared with the typical perceptual entropy detecting on frequency domain，it has some advantages, such as higher time resolution, more accuracy and simple algorithm. -
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