基于最大后驗(yàn)相位估計(jì)的多帶譜減語(yǔ)音增強(qiáng)算法
doi: 10.11999/JEIT161381
基金項(xiàng)目:
十二五國(guó)家科技支撐計(jì)劃重大項(xiàng)目(2012BAH38F00)
Multi-band Spectral Subtraction of Speech Enhancement Based on Maximum Posteriori Phase Estimation
Funds:
The National Science and Technology Planning?Project (2012BAH38F00)
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摘要: 傳統(tǒng)語(yǔ)音增強(qiáng)算法中因?yàn)樽V減法算法簡(jiǎn)單易于實(shí)現(xiàn)而得到廣泛研究，譜減法的原理是將帶噪語(yǔ)音幅度與估計(jì)的噪聲幅度進(jìn)行相減，并疊加帶噪語(yǔ)音相位，進(jìn)而重構(gòu)增強(qiáng)語(yǔ)音譜。該方法在低信噪比下因?yàn)闆]有進(jìn)行相位估計(jì)，會(huì)存在較大的估計(jì)誤差，并且因?yàn)閷?duì)噪聲估計(jì)的不準(zhǔn)確，會(huì)產(chǎn)生 音樂噪聲?；谧V減法的缺點(diǎn)該文提出一種基于最大后驗(yàn)相位估計(jì)的多帶譜減法，其中多帶譜減法可減少音樂噪聲的影響，最大后驗(yàn)方法估計(jì)純凈語(yǔ)音相位，可以減少在低信噪比時(shí)的估計(jì)誤差。實(shí)驗(yàn)結(jié)果表明該方法在低信噪比時(shí)取得了較好的增強(qiáng)效果。
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關(guān)鍵詞:
- 語(yǔ)音增強(qiáng) /
- 最大后驗(yàn)相位估計(jì) /
- 多帶譜減 /
- 低信噪比
Abstract: The spectral subtraction speech enhancement is extensively used due to its simplicity and easy to implement. The principle of this method is to subtract the estimated magnitude of the noise from the magnitude of the noisy signal, but the phase of the noisy signal is unchanged. This conventional method produces the estimating error because it exploits the noisy phase, especially in low SNR, and it produces musical noise because of the inaccuracy of the noise estimation. This paper proposes a multi-band spectral subtraction algorithm based on maximum posteriori phase estimation. Experimental results show that the proposed method can get better performance than the conventional method especially in low SNR. -
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