Method and apparatus for removing from an audio signal periodic noise pulses representable as signals combined by convolution
AssigneeMotorola, Inc.
InventorsWilliam M. Kushner, Sara M. Harton
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Abstract
A method for removing periodic noise pulses from a continuous audio signal generated in a pressurized air delivery system includes the steps of: detecting, in a time-windowed segment of the continuous audio signal generated in the pressurized air delivery system, a plurality of the periodic noise pulses having a pulse period and being representable in the form of a plurality of signal components combined by convolution; deconvolving the plurality of signal components to generate a plurality of deconvolved signal components; and removing at least a portion of the periodic noise pulses from the time-windowed segment of the continuous audio signal using the deconvolved signal components.
Claims20
A method for removing periodic noise pulses from a continuous audio signal generated in a pressurized air delivery system, the method comprising the steps of:
- detecting, in a time-windowed segment of the continuous audio signal generated in the pressurized air delivery system, a plurality of the periodic noise pulses each possessing a pulse period, wherein the periodic noise pulses of the continuous audio signal is representable in the form of a plurality of signal components combined by convolution;
- deconvolving the plurality of signal components to generate a plurality of deconvolved signal components;
- and
- removing at least a portion of the periodic noise pulses from the time-windowed segment of the continuous audio signal using the deconvolved signal components.
A device for removing low-air alarm noise pulses from a continuous audio signal generated in a pressurized air delivery system, the device comprising:
- an interface receiving the continuous audio signal;
- and
- a processing device coupled to the interface and:
- detecting, in a time-windowed segment of the continuous audio signal generated in the pressurized air delivery system, a plurality of the periodic noise pulses each possessing a pulse period, wherein the periodic noise pulses of the continuous audio signal is representable in the form of a plurality of signal components combined by convolution;
- deconvolving the plurality of signal components using cepstral deconvolution to generate a plurality of deconvolved cepstrum signal components;
- and
- removing at least a portion of the low-air alarm noise pulses from the time-windowed segment of the continuous audio signal using the deconvolved cepstrum signal components.
A computer-readable storage element having computer readable code stored thereon for programming a computer to perform a method for removing periodic noise pulses from a continuous audio signal generated in a pressurized air delivery system, the method comprising the steps of:
- detecting, in a time-windowed segment of the continuous audio signal generated in the pressurized air delivery system, a plurality of the periodic noise pulses each possessing a pulse period, wherein the periodic noise pulses of the continuous audio signal is representable in the form of a plurality of signal components combined by convolution;
- deconvolving the plurality of signal components to generate a plurality of deconvolved signal components;
- and
- removing at least a portion of the periodic noise pulses from the time-windowed segment of the continuous audio signal using the deconvolved signal components.
Dependencies are inferred from the claim text.