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Transform coding of audio signals using perceptual noise criteria

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1 Author(s)
Johnston, J.D. ; AT&T Bell Labs., Murray Hill, NJ, USA

A 4-b/sample transform coder is designed using a psychoacoustically derived noise-making threshold that is based on the short-term spectrum of the signal. The coder has been tested in a formal subjective test involving a wide selection of monophonic audio inputs. The signals used in the test were of 15-kHz bandwidth, sampled at 32 kHz. The bit rate of the resulting coder was 128 kb/s. The subjective test shows that the coded signal could not be distinguished from the original at that bit rate. Subsequent informal work suggests that a bit rate of 96 kb/s may maintain transparency for the set of inputs used in the test

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:6 ,  Issue: 2 )