Configurable filter for processing television audio signals
AssigneeTHAT Corporation
InventorsMatthew S. Barnhill, Roger R. Darr
Life of this patent
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Abstract
Television audio signal encoders include a matrix that sums a left channel audio signal and a right channel audio signal to produce a sum signal. The matrix also subtracts one of the left and right audio signals from the other to produce a difference signal. The encoders also include a configurable infinite impulse response digital filter that selectively uses one or more sets of filter coefficients to filter the difference signal and/or the sum signals. Each selectable set of filter coefficients is associated with a unique filtering application to prepare the difference signal for transmission. Decoders with the matrix are also disclosed.
Claims24
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 sum signal or the difference signal or both, wherein each selectable set of filter coefficients is associated with a unique filtering application to prepare the difference signal, or sum channel, or both for transmission, wherein the configurable infinite impulse response digital filter includes a selector configured to select an input signal 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.
A television audio signal decoder, comprising:
- a configurable infinite impulse response digital filter configured to selectively use one or more sets of filter coefficients to filter a difference signal or a sum signal or both, wherein the difference signal is produced by subtracting one of a left channel and a right channel audio signal from the other of the left channel and right channel audio signal and wherein sum the sum signal is produced by adding the left channel audio signal and the right channel audio signal, and wherein each selectable set of filter coefficients is associated with a unique filtering application to prepare the difference signal for separating the left channel and right channel audio signals or to prepare the sum signal for adding the left channel and right channel audio signals, or both, wherein the configurable infinite impulse response digital filter includes a selector configured to select an input signal 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;
- and
- a matrix configured to separate the left channel and right channel audio signals from the difference signal or the sum signal or both.
Dependencies are inferred from the claim text.