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NMR measurements on multiple generations audio coding

: Keyhl, M.; Herre, J.; Schmidmer, C.

Amsterdam, 1994
Preprint - Audio Engineering Society, 3803
Audio Engineering Society (Convention) <96, 1994, Amsterdam>
Conference Proceedings
Fraunhofer IIS A ( IIS) ()
audio coding; cascaded coding; DAB; digital audio broadcasting; ISO/MPEG; Kaskadencodierung; NMR; noise-to-mask ratio; perceptual coding; perceptual measurement; psychoacoustic measurement system; psychoakustisches Meßsystem; Toncodierung

With low bit-rate coding getting widespread in studio and consumer applications, multiple generations ("tandem") coding does become realitiy. It is reported that depending on the algorithms and bit-rates employed, the final sound qualitiy may decrease seriously. The noise-to-mask ratio perceptual measurement is capable of evaluating the margin towards audibility. The results of numerous measurements on typical tandem combinations will be presented and the consequences on multiple generations coding will be discussed.