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Dynamic range compression, despite being one of the most widely used audio effects, is still poorly understood, and there is little formal knowledge and analysis of compressor design techniques. In this tutorial we describe several different approaches to digital dynamic range compressor design.
The attack and release times of feedback compressors are affected by the compression ratio while feed-forward compressors time behavior is determined mainly by the speed of the level sensing circuitry.
23 maj 2023 · A compressor works through several primary parameters: Threshold, Ratio, Attack, Release, and Make-up Gain. Threshold: The level at which compression starts. Sounds above the threshold get compressed. Ratio: Determines how much compression is applied once the signal exceeds the threshold.
Ratio: used to transform amplitudes by converting input values into output values. 2:1 means for every 2 dB in over the threshold, 1 dB comes out. 6:1 means for every 6 dB in over the threshold, 1 dB comes out. Attack: how quickly processing start on onset of amplitude above threshold.
Attack and release times (τ A and τ R) provide a degree of control over how quickly a compressor acts. They are also known as time constants. Instantaneous compressor response is not sought because it introduces distortion on the signal. The attack time defines the time it takes the compressor to decrease the gain to the level determined Fig. 2.
Attack and Release Time Constants in RMS-Based Feedback Compressors. FRED. FLORU, AES. Member. THAT Corporation, Marlborough, Maxsachusetts, USA. The goal of the paper is to develop mathematical models for feedback and feedforward compressors.
THE BASICS. There are four basic parameters on all compressors: compression ratio, threshold level, attack time and release time. Ratio is a way to express the degree to which the compressor is reducing dynamic range. Ratio indicates the difference between the signal increase coming into the compressor and the increase at the output level.
