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This paper addresses the problem of speech enhancement in car environment. After describing the method used to characterize the noisy environment, the main influence on speech processing in two applications: speech recognition and transmission is presented.Most of noise reduction methods proposed in the last part yean are developped and evaluated in the case of additive white noise. For both types of application we have tried such methods. Without modifications the results obtained with car noise were poor. With a preprocessing of the noisy signal improvements are shown especially for speech recognition.

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