Modifying an apparent elevation of a sound source utilizing second-order filter sections
First Claim
1. A method comprising:
- determining an actual elevation of a sound source, wherein the actual elevation is indicative of a first location at which the sound source is physically located relative to a first listening reference point;
determining a desired elevation for a portion of an audio signal, wherein the desired elevation is indicative of a second location at which the portion of the audio signal is perceived to be physically located relative to the first listening reference point, and the desired elevation is different from the actual elevation; and
based on the actual elevation, the desired elevation, and the first listening reference point, modifying the audio signal by;
generating a digital filter based on information relating to different individual filters, wherein the information relating to different individual filters comprises parametric values defining a number of parametric equalizers (PEQs) that characterize the different individual filters based on Head-Related Transfer Functions (HRTFs) corresponding to the actual elevation and the desired elevation; and
filtering the portion of the audio signal during the reproduction of the audio signal via the digital filter that increases accuracy in apparent elevation change and reduces spectral coloration, such that the portion of the audio signal is perceived to be physically located at the desired elevation during reproduction of the audio signal via the sound source.
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Abstract
One embodiment provides a method comprising determining an actual elevation of a sound source. The actual elevation is indicative of a first location at which the sound source is physically located relative to a first listening reference point. The method further comprises determining a desired elevation for a portion of an audio signal. The desired elevation is indicative of a second location at which the portion of the audio signal is perceived to be physically located relative to the first listening reference point. The desired elevation is different from the actual elevation. The method further comprises, based on the actual elevation, the desired elevation and the first listening reference point, modifying the audio signal, such that the portion of the audio signal is perceived to be physically located at the desired elevation during reproduction of the audio signal via the sound source.
16 Citations
18 Claims
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1. A method comprising:
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determining an actual elevation of a sound source, wherein the actual elevation is indicative of a first location at which the sound source is physically located relative to a first listening reference point; determining a desired elevation for a portion of an audio signal, wherein the desired elevation is indicative of a second location at which the portion of the audio signal is perceived to be physically located relative to the first listening reference point, and the desired elevation is different from the actual elevation; and based on the actual elevation, the desired elevation, and the first listening reference point, modifying the audio signal by; generating a digital filter based on information relating to different individual filters, wherein the information relating to different individual filters comprises parametric values defining a number of parametric equalizers (PEQs) that characterize the different individual filters based on Head-Related Transfer Functions (HRTFs) corresponding to the actual elevation and the desired elevation; and filtering the portion of the audio signal during the reproduction of the audio signal via the digital filter that increases accuracy in apparent elevation change and reduces spectral coloration, such that the portion of the audio signal is perceived to be physically located at the desired elevation during reproduction of the audio signal via the sound source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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at least one processor; and a non-transitory processor-readable memory device storing instructions that when executed by the at least one processor causes the at least one processor to perform operations including; determining an actual elevation of a sound source, wherein the actual elevation is indicative of a first location at which the sound source is physically located relative to a first listening reference point; determining a desired elevation for a portion of an audio signal, wherein the desired elevation is indicative of a second location at which the portion of the audio signal is perceived to be physically located relative to the first listening reference point, and the desired elevation is different from the actual elevation; and based on the actual elevation, the desired elevation, and the first listening reference point, modifying the audio signal by; generating a digital filter based on information relating to different individual filters, wherein the information relating to different individual filters comprises parametric values defining a number of parametric equalizers (PEQs) that characterize the different individual filters based on Head-Related Transfer Functions (HRTFs) corresponding to the actual elevation and the desired elevation; and filtering the portion of the audio signal during the reproduction of the audio signal via the digital filter that increases accuracy in apparent elevation change and reduces spectral coloration, such that the portion of the audio signal is perceived to be physically located at the desired elevation during reproduction of the audio signal via the sound source. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer-readable medium having instructions which when executed on a computer perform a method comprising:
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determining an actual elevation of a sound source, wherein the actual elevation is indicative of a first location at which the sound source is physically located relative to a first listening reference point; determining a desired elevation for a portion of an audio signal, wherein the desired elevation is indicative of a second location at which the portion of the audio signal is perceived to be physically located relative to the first listening reference point, and the desired elevation is different from the actual elevation; and based on the actual elevation, the desired elevation, and the first listening reference point, modifying the audio signal by; generating a digital filter based on information relating to different individual filters, wherein the information relating to different individual filters comprises parametric values defining a number of parametric equalizers (PEQs) that characterize the different individual filters based on Head-Related Transfer Functions (HRTFs) corresponding to the actual elevation and the desired elevation; and filtering the portion of the audio signal during the reproduction of the audio signal via the digital filter that increases accuracy in apparent elevation change and reduces spectral coloration, such that the portion of the audio signal is perceived to be physically located at the desired elevation during reproduction of the audio signal via the sound source. - View Dependent Claims (18)
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Specification