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Low bit rate coding of high quality digital audio: algorithms and evaluation of quality

Codierung mit geringer Bitrate von hochqualitativem Digital-Audio: Algorithmen und Qualitätsauswertung
: Brandenburg, K.; Seitzer, D.

Pohlmann, K.C. ; Audio Engineering Society -AES-, New York/N.Y.:
Audio in digital times : Proceedings of the 7th International AES Conference, 1989 May 14-17
New York, NY: AES, 1990 (Proceedings of the AES International Conference 7)
ISBN: 0-937803-14-6
Audio Engineering Society (International Conference) <7, 1989, Toronto>
Conference Paper
Fraunhofer IIS A ( IIS) ()
Codierung; Echtzeitbetrieb; Audioakustik; digitale Signalverarbeitung; Übertragungsqualität; Datenübertragungsgeschwindigkeit; Decodierung; Mathematisches Verfahren

Based on frequency domain techniques, coding of high quality digital audio with bit rates of down to 64 kbit/s is possible.The NMR (Noise-to-Mask Ratio) has been introduced for quality evaluation and optimization for low bit rate coding schemes. Real time implementations of low bit rate codecs and a measurement system have been developed. Several coding schemes (Optimal Coding in the Frequency domain (OCF), Low-Complexity Adaptive Transform Coding (LC-ATC), Sub-Band Coding (SBC)) are compared using NMR. Comparison results for different types of music and testsignals are presented.