Time processed head related transfer functions in a headphone spatialization system
First Claim
1. An apparatus for implementing a Head Related Transfer Function on an input audio signal from a single sound source in a headtracked listening environment comprising:
- a series of principal component filters attached to receive said input audio signal and each outputting a principal component corresponding to a portion of a predetermined simulated sound arrival from the sound source with the portions together forming said predetermined simulated sound arrival;
a series of delay elements each attached to a corresponding one of said principal component filters, each delay element being arranged to delay the output of said filter by a variable amount depending on a delay input so as to produce a filter delay output;
a summer interconnected to said series of delay elements and summing said filter delay outputs to produce a monaural audio speaker output signal; and
a headtrack parameter mapping unit having a current orientation signal input and interconnected to each of said series of delay elements so as to provide said delay inputs to said delay elements.
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Abstract
An apparatus for implementing a Head Related Transfer Function on an input audio signal in a headtracked listening environment comprising: a series of principle component filters attached to the input audio signal and each outputting a predetermined simulated sound arrival; a series of delay elements each attached to a corresponding one of the principle component filters and delaying the output of the filter by a variable amount depending on a delay input so as to produce a filter delay output; a summation means interconnected to the series of delay elements and summing the filter delay outputs to produce an audio speaker output signal; headtrack parameter mapping unit having a current orientation signal input and interconnected to each of the series of delay elements so as to provided the delay inputs.
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Citations
11 Claims
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1. An apparatus for implementing a Head Related Transfer Function on an input audio signal from a single sound source in a headtracked listening environment comprising:
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a series of principal component filters attached to receive said input audio signal and each outputting a principal component corresponding to a portion of a predetermined simulated sound arrival from the sound source with the portions together forming said predetermined simulated sound arrival;
a series of delay elements each attached to a corresponding one of said principal component filters, each delay element being arranged to delay the output of said filter by a variable amount depending on a delay input so as to produce a filter delay output;
a summer interconnected to said series of delay elements and summing said filter delay outputs to produce a monaural audio speaker output signal; and
a headtrack parameter mapping unit having a current orientation signal input and interconnected to each of said series of delay elements so as to provide said delay inputs to said delay elements. - View Dependent Claims (2, 4, 5, 6)
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3. A method of implementing a Head Related Transfer Function on an audio signal from a single sound source in a headtracked listening environment, said method comprising:
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filtering said audio signal by a series of principal component filters to produce a series of filtered component outputs, each of said principal component filters outputting a portion of a predetermined simulated sound arrival from the sound source with the portions together forming said predetermined simulated sound arrival;
delaying each of said filtered component outputs by an amount dependent on a current listener'"'"'s head orientation so as to produce delayed principal components; and
combining said delayed principal components to form a monaural output audio speaker signal. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification