Telos Zephyr Xstream User Manual page 124

USER'S MANUAL
Masking effects in the time domain. Masking occurs both before and after the masking signal.
The combined results of time and frequency vs. masking. Signals under the curve are inaudible.
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IMPORTANT!
Due to a perceptual coder's reliance on precisely modeling principles of human perception,
audio to be coded should not be processed with any non-linear dynamics-processing such as
clipping, multi-band compression, or hard limiting. Wideband compression, or AGC, is
acceptable, and may be desirable if a consistent level cannot otherwise be achieved.
The same is true of audio that has been decoded, after passing through a perceptual coding
cycle, but to a much lesser degree.
For more information on this follow the link to our Omnia Audio website that has a paper
delivered at the AES by Frank Foti on this topic.
http://www.omniaaudio.com/techinfo/default.htm
Section 6: AUDIO CODING REFERENCE 112