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US 10,375,493 B2Granted
Audio test mode
AssigneeCirrus Logic, Inc.
InventorsJohn Paul Lesso, Yanto Suryono
Life of this patent
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Abstract
An audio system receives an input signal and, if the input signal has a sparse representation in the frequency domain, comprising components at at least one frequency of interest, the input signal is filtered in at least one band pass filter, such that only components at the or each frequency of interest are passed to an output. The operation is able in some case to analyze the input signal to determine whether the input signal has a sparse representation in the frequency domain.
Claims20
An audio system, comprising:
- an input for receiving an input signal;
- an output;
- a sparsity detector for determining whether the input signal has a sparse representation in the frequency domain;
- a switch, wherein the switch is controlled by an output signal from the sparsity detector based on a determination whether the input signal has a sparse representation in the frequency domain;
- and
- a filter for filtering the input signal in at least one band pass filter,
- wherein, if the input signal is determined to have a sparse representation in the frequency domain, the switch is controlled such that the output of the filter is passed to the output and therefore only components at at least one frequency of interest are passed to the output, and if the input signal is determined not to have a sparse representation in the frequency domain, the switch is controlled such that the input signal is passed to the output.
4 more elements
A method of operation of an audio system, comprising:
- receiving an input signal;
- determining by means of a processing element whether the input signal has a sparse representation in the frequency domain, comprising components at at least one frequency of interest;
- if the input signal is determined to have a sparse representation in the frequency domain, filtering the input signal in at least one band pass filter, such that only components at the or each frequency of interest are passed to an output;
- and
- if the input signal is determined not to have a sparse representation in the frequency domain, passing the input signal to the output.
2 more elements
Dependencies are inferred from the claim text.