Title :
Audio coding with signal adaptive filterbanks
Author :
Princen, J. ; Johnston, J.D.
Author_Institution :
AT&T Bell Labs., Murray Hill, NJ, USA
Abstract :
In this paper we present a high quality audio coding system based on a novel nonuniform modulated filterbank coupled with time-varying cosine modulated filterbanks in a cascade architecture. The system makes use of psychoacoustic thresholds in a natural way to adapt the resolution of the filterbank to achieve high coding gain on a wide range of signal types. Results show that the system provides excellent quality at 64 kb/s and good quality at 48 kb/s for monophonic coding
Keywords :
adaptive filters; adaptive signal processing; audio coding; band-pass filters; quantisation (signal); cascade architecture; high coding gain; high quality audio coding system; monophonic coding; nonuniform modulated filterbank; psychoacoustic thresholds; resolution; signal adaptive filterbanks; time-varying cosine modulated filterbanks; Adaptive filters; Audio coding; Filter bank; Frequency; Modulation coding; Noise level; Psychoacoustic models; Psychology; Quantization; Signal resolution;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on
Conference_Location :
Detroit, MI
Print_ISBN :
0-7803-2431-5
DOI :
10.1109/ICASSP.1995.479494
