The conventional sub-band methods can improve the recognition accuracy of noisy speech, but degrade that of clean speech.

传统的子带特征方法虽然能提高噪声下的语音识别性能，但通常会使无噪声情况下的识别性能下降。

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Speech enhancement tries to extract clean speech signal from original one with noise and improve the SNR of speech signal.

语音增强则从含噪信号中提取干净的语音信号，提高语音信号的信噪比。

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In order to extract the underlying clean speech signal from the noise speech signal and reduce the noise disturbance to the minimum, speech enhancement is needed.

为了从带噪语音信号中获得尽可能纯净的语音信号，减少噪音的干扰，就需进行语音增强。

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Luckily, the PadFone 2's voice recording performance is somewhere in between the two aforementioned devices: some noise is suppressed, and what's left is clean enough for speech interpretation.

ENGADGET: ASUS PadFone 2 review: two times is a charm for this phone-in-tablet combo

After a quick meeting and tearful farewell with his family, he is escorted into the first class compartment of a Northwest Airlines jumbo jet for a long flight to Detroit in the U.S. Upon landing, he gets a thorough medical examination by doctors at the Henry Ford Hospital, a clean bill of health, and delivers a speech to a sympathetic audience in New York.

CNN: EXPORTING DISSENT

Mr Cameron also focused on the need to clean up politics at Westminster in his spring forum speech, in the wake of recent scandals over MPs ' expenses.

BBC: NEWS | UK | UK Politics | Cameron in 'family friendly' push