RANGE-CONSTRAINED PHASE RECONSTRUCTION FOR RECOVERING TIME-DOMAIN SIGNAL FROM QUANTIZED AMPLITUDE AND PHASE SPECTROGRAM
RANGE-CONSTRAINED PHASE RECONSTRUCTION FOR RECOVERING TIME-DOMAIN SIGNAL FROM QUANTIZED AMPLITUDE AND PHASE SPECTROGRAM
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发表时间：
2012
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通讯作者：
Shoichi Sato;Y. Kamamoto;S. Sagayama
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作者：
Shoichi Sato;Y. Kamamoto;S. Sagayama
提出了一种从量化后的幅相谱图中恢复时域信号的新算法，该算法适用于基于谱图的音频编码。为了获得更好的音质，首先应用相位重构技术，约束每个量化范围内的每个时频点的相位，然后通过标准的短时傅里叶逆变换恢复时域信号。基于客观PEAQ测度的实验结果表明，所提出的距离约束相位重构方法对改善音质是有效的。
This paper describes a novel algorithm for recovering time-domain signal from quantized amplitude and phase spectrogram, which is applicable for spectrogram-based audio coding. In order to obtain a better quality sound, a phase reconstruction technique is first applied with constraint for keeping phase in each time-frequency bin within each quantization range, and then, time-domain signal is recovered by the standard inverse short-time Fourier transform. Experimental evaluation based on the objective PEAQ measure shows that the proposed range-constrained phase reconstruction is effective for improving the sound quality.