The green line shows a 3:1 ratio, where we have the line up and to the right of the 0 dB threshold - for example, an input level of 6 dB yields an output level of only 2 dB - the louder parts of the signal are now quieter. The blue line shows a 9:1 compression ratio, which is on the edge of the very aggressive level control known as limiting (for example, the purple line illustrates a 20:1 ratio). The yellow line shows a 2:1 ratio, so an input level of 9 dB above the threshold would only yield 4.5 dB of gain at the output. The orange line is a very gentle 1.5:1 ratio, where every 1.5 dB of input gain above the threshold results in only 1dB of gain at the output, so for example an input level of 9 dB above the threshold would yield an output level increase of 6 dB. The colored lines represent various compression ratios. As you can see, the level in equals the level out. The red line shows the response for 1:1 ratio, meaning no compression. In this example, the grey line represents the threshold. Take a look at the compressor below, just one of six useful modules for channel processing and mixing found in ![]() The average compressor has six main parameters that are important to understand: threshold, ratio, knee, attack time, release time, and makeup gain. We actually won’t dive too deep into parameters here, as we’ve actually already covered compressor parameters in our Pro Audio Essentials course. In compression, the dynamic range becomes narrower - the highest peaks and the quietest parts have fewer dB of level difference between them. It’s our job to make that distortion feel transparent and to use our dynamics to create the best-sounding performance we can. The compressor typically achieves this by emphasizing certain harmonics based on how the compressor is hitting the incoming signal. A compressor is used to reduce a signal's dynamic range-that is, to reduce the difference in level between the loudest and quietest parts of an audio signal.Ĭompression is commonly used to attenuate loud transient peaks (e.g., when a singer suddenly belts out a high note) to help maintain a consistent level.Ĭompression essentially causes distortion in a signal, in that it changes the original sound of the signal through its processing.
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