Method and apparatus for acoustic crosstalk cancellation
AssigneeCirrus Logic, Inc.
InventorVitaliy Sapozhnykov
Life of this patent
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Abstract
An acoustic crosstalk canceller is determined for an asymmetric audio playback device, by determining a transfer function of an acoustic stereo playback path having asymmetries defined by speakers of the playback device. The transfer function is inverted to determine an inverse transfer function. The inverse transfer function is regularised by applying frequency dependent regularisation parameters to obtain an acoustic crosstalk canceller. Also, the inverse transfer function could be regularised for symmetric playback paths by applying aggregated frequency dependent regularisation parameters to obtain an acoustic crosstalk canceller without band branching.
Claims27
A device for reducing acoustic crosstalk at a time of audio playback, the device comprising:
- a processor configured to pass a stereo audio signal through a crosstalk canceller, wherein the crosstalk canceller comprises a regularised inverse transfer function of an acoustic stereo playback path having asymmetries defined by stereo playback speakers having unequal directivity with respect to the device, wherein the crosstalk canceller is configured to provide acoustic crosstalk cancellation in relation to the speakers having unequal directivity, and wherein the crosstalk canceller has been regularised by aggregated frequency dependent regularisation parameters;
- and further configured to pass an output of the crosstalk canceller to the stereo playback speakers for acoustic playback.
A method of determining an acoustic crosstalk canceller for an asymmetric;
- audio playback device, the method comprising:
- determining a transfer function of an acoustic stereo playback path having asymmetries defined by speakers of the playback device having unequal directivity with respect to the device;
- inverting the transfer function to determine an inverse transfer function;
- regularising the inverse transfer function by applying aggregated frequency dependent regularisation parameters to obtain an acoustic crosstalk canceller.
A device for determining an acoustic crosstalk canceller for an asymmetric audio playback device, the device comprising:
- a processor configured to determine a transfer function of an acoustic stereo playback path having asymmetries defined by speakers of the playback device having unequal directivity with respect to the device;
- invert the transfer function to determine an inverse transfer function;
- and regularise the inverse transfer function by applying aggregated frequency dependent regularisation parameters to obtain an acoustic crosstalk canceller.
A method of reducing acoustic crosstalk at a time of audio playback, the method comprising:
- passing a stereo audio signal rough a crosstalk canceller, wherein the crosstalk canceller comprises a regularised inverse transfer function of an acoustic stereo playback path having asymmetries defined by stereo playback speakers having unequal directivity with respect to the device, wherein the crosstalk canceller has been regularised by aggregated frequency dependent regularisation parameters;
- and
- passing an output of the crosstalk canceller to the stereo playback loudspeakers for acoustic playback.
A device for reducing acoustic crosstalk at a time of audio playback, the device comprising:
- a processor configured to pass a stereo audio signal through a crosstalk canceller, wherein the crosstalk canceller comprises a regularised inverse transfer function of an acoustic stereo playback path having asymmetries defined by stereo playback speakers having unequal directivity with respect to the device, wherein the crosstalk canceller has been regularised by aggregated frequency dependent regularisation parameters;
- and further configured to pass an output of the crosstalk canceller to stereo loudspeakers for acoustic playback.
A method of determining an acoustic crosstalk canceller for an asymmetric audio playback device, the method comprising:
- determining a transfer function of an acoustic stereo playback path having asymmetries defined by stereo playback speakers having unequal directivity with respect to the device;
- inverting the transfer function to determine an inverse transfer function;
- regularising the inverse transfer function by applying aggregated frequency dependent regularisation parameters, to obtain an acoustic crosstalk canceller.
A device for determining an acoustic crosstalk canceller for an asymmetric audio playback device, the device comprising;
- a processor configured to determine a transfer function of an acoustic stereo playback path having asymmetries defined by stereo playback speakers having unequal directivity with respect to the device;
- invert the transfer function to determine an inverse transfer function;
- and regularise the inverse transfer function by applying aggregated frequency dependent regularisation parameters, to obtain an acoustic crosstalk canceller.
A method of reducing acoustic crosstalk at a time of audio playback, the method comprising:
- passing a stereo audio signal through a crosstalk canceller, wherein the crosstalk canceller comprises a regularised inverse transfer function of an acoustic stereo playback path having asymmetries defined by stereo playback speakers having unequal directivity with respect to the device, wherein the crosstalk canceller has been regularised by aggregated frequency dependent regularisation parameters;
- and
- passing an output of the crosstalk canceller to stereo loudspeakers for acoustic playback.
Dependencies are inferred from the claim text.