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US 9,202,456 B2Granted
Systems, methods, apparatus, and computer-readable media for automatic control of active noise cancellation
AssigneeQUALCOMM Incorporated
InventorsTe-Won Lee, Hyun Jin Park, Jeremy Toman
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Abstract
Active noise cancellation is combined with spectrum modification of a reproduced audio signal to enhance intelligibility.
Claims20
A method of processing a reproduced audio signal, said method comprising performing the following acts within a device that is configured to process audio signals:
- based on information from a first channel of a sensed multichannel audio signal and information from a second channel of the sensed multichannel audio signal, generating a noise estimate;
- based on information from the noise estimate and a power ratio of a subband power estimate of the noise estimate to a corresponding subband power estimate of the reproduced audio signal, boosting at least one frequency subband of the reproduced audio signal with respect to at least one other frequency subband of the reproduced audio signal to produce an equalized audio signal;
- based on information from a sensed noise reference signal, generating an anti-noise signal;
- and
- combining the equalized audio signal and the anti-noise signal to produce an audio output signal.
2 more elements
A computer-readable medium having tangible structures that store machine-executable instructions which when executed by at least one processor cause the at least one processor to:
- generate a noise estimate based on information from a first channel of a sensed multichannel audio signal and information from a second channel of the sensed multichannel audio signal;
- boost at least one frequency subband of a reproduced audio signal with respect to at least one other frequency subband of the reproduced audio signal, based on information from the noise estimate and a power ratio of a subband power estimate of the noise estimate to a corresponding subband power estimate of the reproduced audio signal, to produce an equalized audio signal;
- generate an anti-noise signal based on information from a sensed noise reference signal;
- and combine the equalized audio signal and the anti-noise signal to produce an audio output signal.
1 more element
An apparatus configured to process a reproduced audio signal, said apparatus comprising:
- means for generating a noise estimate based on information from a first channel of a sensed multichannel audio signal and information from a second channel of the sensed multichannel audio signal;
- means for boosting at least one frequency subband of the reproduced audio signal with respect to at least one other frequency subband of the reproduced audio signal, based on information from the noise estimate and a power ratio of a subband power estimate of the noise estimate to a corresponding subband power estimate of the reproduced audio signal, to produce an equalized audio signal;
- means for generating an anti-noise signal based on information from a sensed noise reference signal;
- and
- means for combining the equalized audio signal and the anti-noise signal to produce an audio output signal.
2 more elements
An apparatus configured to process a reproduced audio signal, said apparatus comprising:
- a spatially selective filter configured to generate a noise estimate based on information from a first channel of a sensed multichannel audio signal and information from a second channel of the sensed multichannel audio signal;
- an equalizer configured to boost at least one frequency subband of the reproduced audio signal with respect to at least one other frequency subband of the reproduced audio signal, based on information from the noise estimate and a power ratio of a subband power estimate of the noise estimate to a corresponding subband power estimate of the reproduced audio signal, to produce an equalized audio signal;
- an active noise cancellation filter configured to generate an anti-noise signal based on information from a sensed noise reference signal;
- and
- an audio output stage configured to combine the equalized audio signal and the anti-noise signal to produce an audio output signal.
2 more elements
Dependencies are inferred from the claim text.