一種基于匹配跟蹤的諧波和獨(dú)立譜線正弦模型實(shí)現(xiàn)方案
An MP-based Harmonic and Individual Lines Sinusoidal Modeling in Parametric Audio Coding
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摘要: 該文基于匹配跟蹤的諧波和獨(dú)立譜線正弦模型提出了一種用于參數(shù)音頻編碼的實(shí)現(xiàn)方案，輸入音頻信號(hào)的正弦成分由諧波聯(lián)合獨(dú)立譜線共同表示，分析合成過(guò)程采用50%疊接相加(OLA)消除幀間不連續(xù)，匹配跟蹤(MP)算法在頻域提取模型參數(shù)(幅度、頻率和相位)大大降低運(yùn)算復(fù)雜度。諧波譜線基頻由諧波積譜法(SHS)獲得，各次諧波頻點(diǎn)確切位置借助MP迭代過(guò)程推出，并進(jìn)行二次曲線擬合，對(duì)應(yīng)的諧波幅度采用LPC譜包絡(luò)近似。獨(dú)立譜線的提取有效彌補(bǔ)了諧波提取不足。實(shí)驗(yàn)證明該文提出的正弦模型實(shí)現(xiàn)方案可以很好地表示出音頻信號(hào)中的平穩(wěn)成分，并對(duì)低比特率的參數(shù)音頻編碼有一定的借鑒性。
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關(guān)鍵詞:
- 音頻編碼;正弦模型;諧波譜線;MP算法;諧波積譜法
Abstract: This paper presents an MP-based harmonic and individual lines sinusoidal modeling used in parametric audio coding. The input audio signal can be represented by harmonic plus individual lines and the model parameters (amplitudes, frequencies and phases) are extracted by MP (Matching Pursuit) algorithm which can lower computational complexity. The fundamental frequency is obtained by subharmonic summation. Harmonic frequency points are decided by MP exactly and are curve-fitted by quadric polynomial. The corresponding harmonic amplitudes are simulated by LPC spectrum envelope. In the decoder, audio signal is reconstructed with IFFT and OLA. The experimental results show that this sinusoidal modeling can represent the stationary parts of the audio signal very well. -
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