Method and device for reducing interference in an audio signal during a call
AssigneesSony Corporation, Sony Mobile Communications Inc.
InventorsJonny Strandh, Kaj Ullén
Life of this patent
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Abstract
In order to reduce interference in an audio signal during a call on a mobile communication device, a plurality of transforms of the audio signal is performed, each transform containing phase information and amplitude information of corresponding samples of the audio signal. The results of the transforms are then averaged in order to generating a compensation signal that can be subtracted from the audio signal.
Claims19
A method for reducing interference in an audio signal during a call on a mobile communication device, comprising the steps of:
- (a) performing a plurality of consecutive transforms of the audio signal, each transform containing phase information and amplitude information of the same consecutive samples of the audio signal,
- (b) averaging results of the plurality of transforms performed in step (a) to identify an interference signal in the audio signal having a constant phase over the samples of the audio signal,
- (c) generating a compensation signal on the basis of the interference signal, and
- (d) subtracting the compensation signal from the audio signal.
A method for reducing interference in an audio signal during a call on a mobile communication device, comprising the steps of:
- (a) performing a Fourier transform on the same frequency as a transmission burst transmitted with said audio signal and on multiples of the frequency of the transmission burst,
- (b) determining an amplitude and a phase relative to a starting point of the transmission burst for each frequency for which the Fourier transform is performed in step (a),
- (c) summarizing the amplitudes and phases determined in step (b) to identify an interference signal in the audio signal having a constant phase for each frequency for which the Fourier transform is performed in step (a),
- (d) generating a compensation signal on the basis of the interference signal and
- (e) subtracting the compensation signal from the audio signal.
A mobile communication device,
- wherein a controller of the mobile communication device is configured to perform the steps of:
- (a) performing a plurality of consecutive transforms of the audio signal, each transform containing phase information and amplitude information of the same consecutive samples of the audio signal,
- (b) averaging results of the plurality of transforms performed in step (a) to identify an interference signal in the audio signal having a constant phase over the samples of the audio signal,
- (c) generating a compensation signal on the basis of the interference signal, and
- (d) subtracting the compensation signal from the audio signal.
A mobile communication device,
- wherein a controller of the mobile communication device is configured to perform the steps of:
- (a) performing a Fourier transform on the same frequency as a transmission burst transmitted with said audio signal and on multiples of the frequency of the transmission burst,
- (b) determining an amplitude and a phase relative to a starting point of the transmission burst for each frequency for which the Fourier transform is performed in step (a),
- (c) summarizing the amplitudes and phases determined in step (b) to identify an interference signal in the audio signal having a constant phase for each frequency for which the Fourier transform is performed in step (a),
- (d) generating a compensation signal on the basis of the interference signal, and
- (e) subtracting the compensation signal from the audio signal.
Dependencies are inferred from the claim text.