Without compression, a 1 dB increase in input is always equivalent to a 1 dB increase in output, but if you set a 4: 1 ratio, you will need a 4 dB increase in input level to get a gain of 1 dB at the output. Difference between compressor and limiter The amount of signal attenuation depends on what is called the compression ratio or rate, which simply indicates the number of decibels that has been reduced compared to the input signal after crossing the threshold and, by the way, the number db to add to the output gain to have equal volume. Weaker signals or signals below this threshold will not be altered, while signals that exceed this threshold will simply decrease in volume. The compressor:Ī compressor uses the threshold setting to define the level from which compression will take place. This makes the sound of an instrument more balanced and helps you maintain a stable level throughout a song, even if the musician varied their sound intensity during their performance. As we saw in previous articles on the operation of the compressor, the latter acts as an automatic volume, or more accurately, decreases the volume from a certain threshold, which has the consequence of reducing the dynamic range of a signal, attenuating the loudest sounds, bringing them closer to the weakest sounds.
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