Amplitude Envelope

The function describing how the maximum amplitude of a waveform evolves over time.
In acoustics the amplitude envelope is often characterized as consisting of four parts:
  1. The attack portion - the part during which the amplitude is rapidly increasing
  2. The decay portion - the "backside" of the attack, during which the amplitude is rapidly diminishing
  3. The sustain portion - the part during which the amplitude is relatively stable
  4. The release portion - the final part during which the amplitude diminishes into silence

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Subjects: Noise & Vibration