A Stereo Acoustic Echo Cancellation Method Based on the Hybrid of Spectral Dominance and Nonlinear Transformation
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摘要: 立體聲聲學回聲控制系統(tǒng)中，兩通道信號間的強相關(guān)性導(dǎo)致自適應(yīng)算法的解不唯一，濾波器失調(diào)較大。為了解決此問題，并盡可能地保留語音質(zhì)量，該文基于心理聲學上的譜優(yōu)勢效應(yīng)提出一種新型的混合立體聲聲學回聲消除方法。根據(jù)譜優(yōu)勢效應(yīng)，在3個低次諧頻處注入能量較弱的正弦信號，以減弱低頻相關(guān)性。同時對非線性變換法進行改進，以用于中高頻去相關(guān)處理。與傳統(tǒng)方法的多方面性能測試對比結(jié)果表明：所提方法能有效改善失調(diào)性能并提高收斂速度，且具有較小的語音失真。Abstract: In stereophonic Acoustic Echo Cancellation (AEC) systems, the strong correlation between the two stereophonic channels leads to nonuniqueness of adaptive solutions and further large filter misalignment. To solve this problem and preserve speech quality, the psychoacoustic spectral dominance effect is utilized to propose a novel hybrid decorrelation method for stereo AEC. According to spectral dominance, weak sinusoids are injected at the three lowest harmonics so as to reduce low-frequency coherence. Besides, the nonlinear transformation method is modified and applied to high-frequency decorrelation. Comparison test on several performances with traditional approaches is carried out. Results show that the proposed method can effectively improve filter misalignment together with convergence rate. Moreover, low speech distortion can be achieved simultaneously.
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