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perceptual noise substitution (speech encoding) (PNS)

Perceptual noise substitution (PNS) is the exchange of perceptual noise.

The PNS process assumes that a human ear cannot perceive a significant difference between sounds. This means that sounds can be substituted and exchanged. If a frequency band contains noise components, they can be replaced by other noise components generated or stored in the playback device.

Perceptual noise substitution is used as an enhancement in MPEG-4 and in Advanced Audio Coding( AAC) to lower the bit rate.

Englisch: perceptual noise substitution (speech encoding) - PNS
Updated at: 15.04.2014
#Words: 77
Links: noise (N), process, frequency band, MPEG-4, advanced audio coding (speech encoding) (AAC)
Translations: DE

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