Audio signal coding with a signal adaptive filterbank

Details Audio signal coding with a signal adaptive filterbank Audio signal coding with a signal adaptive filterbank

1995-12-22

1998-03-24

MacDonald, Allen R.

395 238, 395 212, G10L 302

Patent

active

057321892

ABSTRACT:
An audio coding technique is presented, which utilizes a time varying non-uniform filterbank in conjunction with a Perceptual Audio Coder. The non-uniform filterbank is formed from a plurality of uniform filter bank sections, and a transition filter. Each uniform filterbank section covers a portion of a predetermined frequency axis, and the transition filter is utilized to cover the remainder of the predetermined frequency axis. Aliasing terms introduced at the band edges of the transition filter are cancelled to obtain an overall transfer function for the non-uniform filterbank, which has linear phase and is approximately flat. Use of the non-uniform filterbank permits an increase in temporal resolution, which results in an improved coding technique over a wide range of frequencies.

REFERENCES:
patent: 5285498 (1994-02-01), Johnston
patent: 5479562 (1995-12-01), Fielder et al.
patent: 5481614 (1996-01-01), Johnston
patent: 5533052 (1996-07-01), Bhaskar
patent: 5574824 (1996-11-01), Slyh et al.
patent: 5592584 (1997-01-01), Ferreira et al.
IEEE Transactions on Signal Processing, Herley, "Exact Interpolation and Iterative Subdivision schemes", vol. 43, No. 6, pp. 1348-1359, Jun. 1995.
IEEE Transactions on Speech and Audio Processing, Paraskevas et al., "Ady.backslash.ifferential Perceptual audio coding method with reduced bitraterequirements", vol. 3, No. 6, pp. 490-503, Nov. 1995.
Circuits and Systems, 1992 IEEE International Symposium, Martin et al., "Lerner-Based Non-Uniform Filter Banks and some of their applications", vol. 2, pp. 1003-1006, May 1992.
Radar, 1994 IEEE NAtional Conference, "Adaptive space-time processing for radar receive arrays with time varying two dimensional subband decompositions", pp. 206-211, Mar. 1994.
ICASSP' 94: Acoustics, Speech & Signal Processing, Sattar et al., "A method for non-parametric waveform estimation based on filter banks", vol. 3pages III-269 to 272, Mar. 1994.

Affiliated with

Also associated with

Rating

Audio signal coding with a signal adaptive filterbank does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Audio signal coding with a signal adaptive filterbank, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio signal coding with a signal adaptive filterbank will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2296381