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Perceptual coding of height-quality audio signals

: Brandenburg, K.


Journal of the Acoustical Society of America : JASA 95 (1994), Nr.5, S.2806
ISSN: 0001-4966
ISSN: 1520-8524
Fraunhofer IIS A ( IIS) ()
audio coding; data compression; Datenkompression; Datenreduktion; error concealment; Fehlerverschlüsselung; gehörangepaßte Codierung; Layer-3; MPEG-2; MPEG-Standard; NMR; Noise to mask ratio; perceptual coding; psychoacoustic; Psychoakustik; Toncodierung

Perceptual coder promise to deliver true transparent coding. The listener should not be able to hear any difference between original and reconstructed signal. The main elements of perceptual coders are a filterbank to map the time domain input signal to a time-frequency domain representation (i. e., the masked threshold) and the quantization and coding step that should include proper noise shaping according to the psychoacoustic model. An overview of current and future audio coding systems is given. The completion of ISO/IEC 11172-3 (the MPEG-1 audio coding standard) marks the end of the work on the first generation of audio coding systems. While audio coding is on the way to widespread application, topics for the new coding systems include joint stereo coding of two or more channels, different analysis-by-synthesis systems, and improved psychoacoustic models.