US 7,539,316 B2
Configurable filter for processing television audio signals
Matthew Barnhill, Duluth, Ga. (US); and Roger Darr, Suwanee, Ga. (US)
Assigned to THAT Corporation, Milford, Mass. (US)
Filed on Mar. 24, 2005, as Appl. No. 11/89,385.
Claims priority of provisional application 60/555853, filed on Mar. 24, 2004.
Prior Publication US 2005/0232433 A1, Oct. 20, 2005
Int. Cl. H04H 5/00 (2006.01); H04R 5/00 (2006.01); H04N 7/00 (2006.01); H04N 5/60 (2006.01)
U.S. Cl. 381—23  [381/4; 381/2; 381/22; 348/481; 348/484; 348/485; 348/738] 56 Claims
OG exemplary drawing
 
1. A television audio signal encoder, comprising:
a matrix configured to sum a left channel audio signal and a right channel audio signal to produce a sum signal, and to subtract one of the left and right audio signals from the other of the left and right signals to produce a difference signal; and
a configurable infinite impulse response digital filter configured to selectively use one or more sets of filter coefficients to filter the difference signal, wherein each selectable set of filter coefficients is associated with a unique filtering application to prepare the difference signal for transmission, wherein the configurable infinite impulse response digital filter includes a selector configured to select an input signal for said configurable infinite impulse response digital filter from a group of input signals, and wherein one input signal from the group of input signals includes an output signal of the configurable infinite impulse response digital filter.