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A Study of Strategies for the Perceptual Coding of Audio Signals

The strategy which is usually used to take into account the masking properties of the ear for the coding of audio signals is to shape the spectrum of the noise introduced by the coding process, according to the frequency masking threshold. The paper describes an experiment which compares different strategies, and shows that, provided the frequency resolution is adequate, it is almost always better to shape the noise spectrum according to the shape of the signal spectrum. This result had been anticipated by the behavior of an auditory model developed by our group.

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