Electrical audio signal processing systems and devices – Monitoring of sound
Patent
1994-08-05
1998-03-17
Kuntz, Curtis
Electrical audio signal processing systems and devices
Monitoring of sound
381 17, 381 1, H04R 2900
Patent
active
057296120
ABSTRACT:
A method and apparatus is capable of accurately deriving acoustic transfer functions such as head-related transfer functions (HRTF) at low cost. Various aspects of the invention include constraining the reflection geometry of a measurement system to facilitate removal of reflection effects, establishing ambient noise level and ambient reverberation time to calibrate test signals, generating soundfields using Golay code test signals, invalidating measurements by detecting test subject movement and short-duration ambient sounds, deriving distance and/or interaural time difference (ITD) using minimum-phase forms of impulse responses, and deriving equalized HRTF suitable for use in acoustic displays without knowing output or input transducer acoustical properties. Spatial resampling of derived HRTF and spectral shaping of test signals are discussed.
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Abel Jonathan Stuart
Foster Scott Haines
Aureal Semiconductor Inc.
Gallagher Thomas A.
Kuntz Curtis
Lathrop David N.
Lee Ping W.
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