该电路可引起有两个频率的音频信号源。

This circuit can cause the audio source has two frequency.

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在现实生活中，有很多音频信号是带有噪声的。

There are many audio signals with noises in the real world.

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在现实生活中，有很多音频信号是带有噪声的。

There are many audio signals with noises in the real world.

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