The compression ratio is the ratio of the input signal gain to the output signal gain. It is generally expressed by a certain ratio. For example, a compression ratio of 1.5:1 cannot be said to be 3:2, which means that the input signal level exceeding the threshold is increased by 1.5. Decibel, the output is increased by 1 decibel. When the compression ratio is equal to infinity, the output signal will no longer increase when the input signal is increased. In this case, the compressor is used as a limiter.
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