本文選題：音頻編碼 + 頻帶擴(kuò)展　； 參考：《電子學(xué)報(bào)》2014年08期

【摘要】：受到傳輸帶寬的限制,寬帶音頻的自然度和聽覺質(zhì)量會(huì)有所下降,因此,本文提出了一種基于灰色Verhulst模型的寬帶向超寬帶音頻頻帶擴(kuò)展方法.根據(jù)音頻信號(hào)頻譜包絡(luò)序列的演變趨勢(shì),采用灰色Verhulst模型對(duì)高頻頻譜包絡(luò)進(jìn)行估計(jì),并利用最近鄰匹配方法對(duì)高頻頻譜細(xì)節(jié)進(jìn)行預(yù)測(cè),最后經(jīng)過高頻頻譜包絡(luò)的調(diào)整,所提方法能夠有效地恢復(fù)7~14kHz頻率范圍內(nèi)的高頻成分.主客觀測(cè)試表明,該方法改善了寬帶音頻的聽覺質(zhì)量,并且優(yōu)于傳統(tǒng)的基于高斯混合模型的音頻頻帶擴(kuò)展方法.
[Abstract]:Due to the limitation of transmission bandwidth, the naturalness and auditory quality of wideband audio will be reduced. Therefore, this paper proposes a method based on grey Verhulst model to extend wideband to ultra-wideband (UWB) audio frequency band. According to the evolution trend of spectrum envelope sequence of audio signal, the grey Verhulst model is used to estimate the envelope of high frequency spectrum, and the nearest neighbor matching method is used to predict the details of high frequency spectrum. Finally, the envelope of high frequency spectrum is adjusted. The proposed method can effectively recover the high frequency components in the frequency range of 7 ~ 14 kHz. Subjective and objective tests show that this method improves the audio quality of broadband audio and is superior to the traditional audio band expansion method based on Gao Si hybrid model.
【作者單位】： 北京工業(yè)大學(xué)電子信息與控制工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(No.61072089)
【分類號(hào)】：TN912.3
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本文編號(hào)：2008912