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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/9592

    Title: 在語音增強系統中優化除雜訊後之語音信號
    Authors: 陸清達
    Contributors: 資訊學院
    Keywords: 語音增強
    speech enhancement
    musical residual noise
    spectral-bin motion
    suppression of residual noise
    noise corruption
    speech refinement.
    Date: 2009
    Issue Date: 2010-05-12 14:28:11 (UTC+8)
    Abstract: 有很多的語音增強處理系統致力於降低受干擾語音信號的雜訊,雖然可以有效的抑制雜訊,但是
    Many speech enhancement systems attempt to reduce the background noise in a noisy speech signal.
    Although the noise can be efficiently reduced, the enhanced speech signal suffers from two major problems,
    known as speech distortion and residual noise. In order to suppress more amount of residual noise, the noisy
    speech should be reduced more. It results in the higher the speech distortion. The speech quality is therefore
    deteriorated. On the contrary, the slighter the noisy speech is reduced, the slighter the speech distortion is.
    This fact results in the more the residual noise to be retained. Accordingly, how to make tradeoff between
    the reduction of residual noise and the reduction of speech distortion is still a major problem for designing a
    speech enhancement system. In this project, we aims at reducing the residual noise and reconstructing
    distorted speech signal for a noisy signal by a three-stage speech enhancement system. The first stage is
    perceptual-based speech enhancement algorithm. This algorithm is beneficial to suppress background noise
    while speech components can be preserved. At the second stage, musical residual noise is detected and
    suppressed. We will investigate the variation properties of residual noise in enhanced speech denoised by
    the first stage. Analyzing the motion vectors of a spectral bin over neighbor subbands and over successive
    frames should be performed. Hence, the musical tone is then detected and suppressed adequately to avoid
    another musical tone arising when a musical tone is suppressed. In order to improve speech quality, the third
    stage is employed to reconstruct the harmonics which were destroyed by infecting noise or removed by the
    speech enhancement algorithm given in the first stage. Consequently, the denoised speech can be refined by
    both reconstructing the harmonics of vowels with little energy which were removed by a speech
    enhancement system or destroyed by corrupting noise, and by suppressing the musical residual noise in a
    denoised speech signal. It enables the processed speech to sound comfortable.
    Appears in Collections:[資訊傳播學系] 科技部研究計畫

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