Multiple non-monotonic quantizer regions for noise shaping

Details Multiple non-monotonic quantizer regions for noise shaping Multiple non-monotonic quantizer regions for noise shaping

2006-03-07

2006-03-07

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

07009543

ABSTRACT:
A signal processing system having a multiple non-monotonic regions quantization transfer function can improve overall delta sigma modulator performance. The non-monotonic quantization transfer function includes multiple quantization level retrograde changeover thresholds. Thus, the quantizer makes retrograde quantization level decisions for predetermined signal levels in multiple non-monotonic regions, i.e., for the ithnon-monotonic quantization region 1≦i≦N, N≧2, and quantizer transfer function Q(s), Q(s1i)≦Q(s2i) for a first set of quantizer input signals |s1i|>|s2i| and Q(s3i)≦Q(s4i), for a second set of quantizer input signals |s3i|>|s4i|. The retrograde quantization level decisions for multiple non-monotonic regions, i.e. Q(s3i)≦Q(s4i), for |s3i|>|s4i|, effectively provide positive feedback to the delta sigma modulator input signal for each of the N non-monotonic regions and result in a more carefully defined gain for the delta sigma modulator.

REFERENCES:
patent: 5757517 (1998-05-01), Couwenhoven et al.
patent: 6154121 (2000-11-01), Cairns et al.
patent: 6445319 (2002-09-01), Bugeja
patent: 6587060 (2003-07-01), Abbey
patent: 6760573 (2004-07-01), Subrahmanya et al.
patent: 2003/0086366 (2003-05-01), Branlund et al.
patent: 2003/0231729 (2003-12-01), Chien et al.
patent: 2003-124812 (2003-04-01), None
Angus, James A.S., “Tree Based Lookahead Sigma Delta Modulators,” Audio Engineering Society 114thConvention, Convention Paper 5825, Mar. 22-25, 2003.
Harpe, Pieter, et al., “Efficient Trellis-Type Sigma Delta Modulator,” Audio Engineering Society 114thConvention, Convention Paper 5845, Mar. 22-25, 2003.
Hawksford, M.O.J., “Parametrically Controlled Noise Shaping in Variable State-Step-Back Pseudo-Trellis SDM,” Audio Engineering Society 115thConvention, Convention Paper, Oct. 10-13, 2003.
Kato, Hiroshi, “Trellis Noise-Shaping Converters and 1-bit Digital Audio,” Audio Engineering Society 112thConvention, Convention Paper 5615, May 10-13, 2002.
Sony Electronics, Inc. and Philips Electronics N.V., “Super Audio Compact Disc, A Technical Proposal,” 1997, no month.
J. Paulos et al., “Improved Signal-To-Noise Ratio Using Tri-Level Delta-Sigma Modulation,” Reprinted from IEEE Proc. ISCAS, May 1987, pp. 245-248.
E. Knapen et al., “Lossless Compression of 1-Bit Audio,” J. Audio Eng. Soc., vol. 52, No. 3, Mar. 2004, pp. 190-199.
A. J. Magrath et al., “A Sigma-Delta Modulator Topology with High Linearity,” 1997 IEEE Int'l Symposium on Circuits and Systems, Jun. 9-12, 1997, Hong Kong, pp. 53-56.

Affiliated with

Also associated with

Rating

Multiple non-monotonic quantizer regions for noise shaping does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiple non-monotonic quantizer regions for noise shaping, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple non-monotonic quantizer regions for noise shaping will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3531585