Reciprocal index lookup for BTSC compatible coefficients

Details Reciprocal index lookup for BTSC compatible coefficients Reciprocal index lookup for BTSC compatible coefficients

2008-07-08

2008-07-08

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Bandwidth reduction or expansion

C375S232000

Reexamination Certificate

active

07397850

ABSTRACT:
An algorithm calculates spectral compression/expansion filter coefficients using a value proportional to a reciprocal of a feedback/feedforward signal and stores the coefficients to a lookup table. The lookup table is indexed by a pre-selected set of coefficient bits to generate a filter coefficient function. A first portion of the lookup table stores a plurality of discrete values at index points of a line segment corresponding to a filter coefficient function approximation, so as to generate an initial discrete value corresponding to the filter coefficient function at a value of the high order bits and a second portion stores a plurality of slope values, which indicates a slope of the filter coefficient function. A linear circuit interpolates/decimates an approximation of the compression/expansion filter coefficient function based on the slope value, the initial discrete value and a preselected set of low order bits of the reciprocal value.

REFERENCES:
patent: 5091957 (1992-02-01), Anderson et al.
patent: 5148275 (1992-09-01), Blatter et al.
patent: 5315660 (1994-05-01), Anderson et al.
patent: 5377272 (1994-12-01), Albean
patent: 5684878 (1997-11-01), Nagura
patent: 5987141 (1999-11-01), Hoover
patent: 6118879 (2000-09-01), Hanna
patent: 6259482 (2001-07-01), Easley et al.
patent: 6351631 (2002-02-01), Noeske et al.
patent: 6588867 (2003-07-01), Darr
patent: 2007/0016316 (2007-01-01), Hanna
Crochiere, R. E., et al., “Multirate Digital Signal Processing”, Prentice-Hall, Inc., Englewood Cliffs, NJ 07632, 1983, pp. 1-3.

Affiliated with

Also associated with

Rating

Reciprocal index lookup for BTSC compatible coefficients does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reciprocal index lookup for BTSC compatible coefficients, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reciprocal index lookup for BTSC compatible coefficients will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2801608