Method for measurement of head related transfer functions
First Claim
1. A method for measurement of Head Related Transfer Functions, comprising the steps of:
- placing a sound source into an individual'"'"'s ear;
establishing a microphone array of a plurality of microphones, said microphone array enveloping the individual'"'"'s head,emanating a predetermined combination of audio signals from said sound source, said combination of audio signals propagating in an outward direction from said individual'"'"'s ear;
collecting pressure wave signals at said microphones generated by said audio signals, said pressure wave signals being a function of anatomical properties of the individual, andprocessing data corresponding to said pressure wave signals to extract a Head Related Transfer Function (HRTF), based on said signals which emanate from within said ear of the individual, and propagate in an outward direction therefrom.
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Abstract
Head Related Transfer Functions (HRTFs) of an individual are measured in rapid fashion in an arrangement where a sound source is positioned in the individual'"'"'s ear channel, while microphones are arranged in the microphone array enveloping the individual'"'"'s head. The pressure waves generated by the sounds emanating from the sound source reach the microphones and are converted into corresponding electrical signals which are further processed in a processing system to extract HRTFs, which may then be used to synthesize a spatial audio scene. The acoustic field generated by the sounds from the sound source can be evaluated at any desired point inside or outside the microphone array.
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Citations
14 Claims
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1. A method for measurement of Head Related Transfer Functions, comprising the steps of:
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placing a sound source into an individual'"'"'s ear; establishing a microphone array of a plurality of microphones, said microphone array enveloping the individual'"'"'s head, emanating a predetermined combination of audio signals from said sound source, said combination of audio signals propagating in an outward direction from said individual'"'"'s ear; collecting pressure wave signals at said microphones generated by said audio signals, said pressure wave signals being a function of anatomical properties of the individual, and processing data corresponding to said pressure wave signals to extract a Head Related Transfer Function (HRTF), based on said signals which emanate from within said ear of the individual, and propagate in an outward direction therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measurement of Head Related Transfer Functions, comprising the steps of:
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placing a sound source into an individual'"'"'s ear; establishing a microphone array of a plurality of microphones, said microphone array enveloping the individual'"'"'s head, emanating a predetermined combination of audio signals from said sound source, collecting pressure wave signals at said microphones generated by said audio signals, said pressure wave signals being a function of anatomical properties of the individual; processing data corresponding to said pressure wave signals to extract a Head Related Transfer Function (HRTF) of the individual therefrom; converting said pressure wave signals into time domain electrical signals and recording the same in a processing system for processing therein; transforming said time domain electrical signals acquired by said microphone array to the frequency domain; applying a HRTF fitting procedure to said frequency domain signals by transforming the same to spherical functions coefficients domain, representing HRTFs; selecting a truncation number p for each wavenumber in said frequency domain, forming a matrix {φ
} of multipoles evaluated at locations of said microphones,forming a set {ψ
} of signal amplitudes at said locations of said microphones, and solving an equation - View Dependent Claims (12)
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13. A system for measurement of Head Related Transfer Function, comprising:
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a sound source adapted to be positioned in the ear of an individual, means for generating a predetermined combination of audio signals emanating from said sound source, a plurality of pressure wave sensors positioned in enveloping relationship with the head of the individual, said pressure wave sensors collecting pressure waves generated by said audio signals emanating from said sound source, data processing means for processing data corresponding to said pressure waves to extract the Head Related Transfer Functions therefrom, wherein the step of extracting further includes; selecting a truncation number p for each wavenumber in a frequency domain derived from a time domain, said time domain in turn derived from signals converted from and corresponding to said pressure waves, forming a matrix {Φ
} of multipoles evaluated at locations of said pressure wave sensors,forming a set {ψ
} of signal amplitudes at said locations of said pressure wave sensors, and solving an equation - View Dependent Claims (14)
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Specification