The speech signal is a kind of typical non-stationary signal.

语音信号是一种典型的非平稳信号。

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Then dimension feature distance could be calculated and used to make a classification for the speech signal.

最后根据特征距离对语音信号类别进行决策分类。

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The speech signal is a analog one, and we can perform its digital transmission by sampling, quantizing and coding.

话音信号是一个模拟信号，通过采样、量化和编码，我们可以实现话音信号的数字传输。

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Joe Weisenthal at Business Insider raises the possibility that Bernanke is being strategic here: even if he is more optimistic than he makes out in the speech, he still wants to signal that the Fed is not about to take its foot off the gas.

FORBES: Bernanke: Still Cautious on the Economy

The signal from this speech is that Bernanke will retain an accommodative position.

FORBES: Bernanke: Still Cautious on the Economy

Economists viewed his speech as a signal that the ECB would resume its bond-buying program.

FORBES: Drugged By Draghi: Markets Rally After ECB Chief Promises To Save Euro