AUDIO SIGNAL PROCESSING
First Claim
Patent Images
1. A method for processing audio signals for a set of headphones, the method comprising:
- receiving a plurality of audio signal inputs, each audio signal input comprising information about a spatial position of a sound source relative to a listener;
mixing two or more of the audio signal inputs to produce a plurality of mixed audio signals;
providing each of the mixed audio signals to one or more positional filters, the positional filters each comprising a head-related transfer function configured to provide a simulated hearing response;
passing each of the audio signal inputs as unmixed audio signals to one or more of the plurality of positional filters, wherein the mixed and unmixed audio signals are arranged such that each audio signal input is provided in mixed and unmixed form to two or more of the positional filters;
applying the positional filters to the mixed audio signals and to the unmixed audio signals to create a plurality of left channel filtered signals a plurality of right channel filtered signals; and
downmixing the plurality of left channel filtered signals into a left audio output signal and downmixing the plurality of right channel filtered signals into a right audio output channel, such that the spatial positions of the plurality of sound sources are perceptible from the left and right output channels of a set of headphones.
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Abstract
Systems and methods of processing audio signals are described. The audio signals comprise information about spatial position of a sound source relative to a listener. At least one audio filter generates two filtered signals for each of audio signal. The two filtered signals are mixed with other filtered signals from other audio signals to create a right output audio channel and a left audio output channel, such that the spatial position of the sound source is perceptible from the right and left audio output channels.
70 Citations
20 Claims
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1. A method for processing audio signals for a set of headphones, the method comprising:
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receiving a plurality of audio signal inputs, each audio signal input comprising information about a spatial position of a sound source relative to a listener;
mixing two or more of the audio signal inputs to produce a plurality of mixed audio signals;
providing each of the mixed audio signals to one or more positional filters, the positional filters each comprising a head-related transfer function configured to provide a simulated hearing response;
passing each of the audio signal inputs as unmixed audio signals to one or more of the plurality of positional filters, wherein the mixed and unmixed audio signals are arranged such that each audio signal input is provided in mixed and unmixed form to two or more of the positional filters;
applying the positional filters to the mixed audio signals and to the unmixed audio signals to create a plurality of left channel filtered signals a plurality of right channel filtered signals; and
downmixing the plurality of left channel filtered signals into a left audio output signal and downmixing the plurality of right channel filtered signals into a right audio output channel, such that the spatial positions of the plurality of sound sources are perceptible from the left and right output channels of a set of headphones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for processing audio signals, the method comprising:
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receiving multiple audio signals, the audio signals comprising information about spatial position of sound sources relative to a listener;
applying at least one audio filter to each audio signal so as to yield two corresponding filtered signals for each audio signal; and
mixing the filtered signals to create a left audio output and a right audio output, wherein the spatial position of the sound sources are perceptible from the right and left output channels. - View Dependent Claims (11, 12, 13, 14)
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15. An apparatus for processing audio signals, the apparatus comprising:
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multiple audio signal inputs, each audio signal input comprising information about spatial position of a sound source relative to a listener;
a plurality of positional filters, wherein each audio signal input is provided to two or more of the positional filters to create at least one right channel filtered signal and at least one left channel filter signal for each audio signal; and
a downmixer configured to downmix the right channel filtered signals into a right audio output channel and downmix the left channel filtered signals into a left audio output channel, such that the spatial positions of the plurality of sound sources are perceptible from the right and left output channels. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus for processing audio signals, the apparatus comprising:
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means for receiving an audio signal, the audio signal comprising information about spatial position of a sound source relative to a listener;
means for selecting at least one audio filter, the at least one audio filter comprising a head-related transfer function configured to provide a simulated hearing response;
means for applying the at least one audio filter to the audio signal so as to yield two corresponding filtered signals, each of the filtered signals having a simulated effect of the head-related transfer function applied to the sound source; and
means for providing one of the filtered signals to a left audio channel and the other filtered signal to a right audio channel, such that the spatial position of the sound source is perceptible from each channel.
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Specification