Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-09-03
1997-02-11
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
G10K 1116
Patent
active
056029268
ABSTRACT:
A method and apparatus of determining the transfer characteristic in an active-noise-control system, which involves generating white noise at an end of a one-dimensional sound field that is defined by a linear ventilating system in which sound travels essentially parallel to the extended direction of the system; equalizing the transfer characteristic of the one-dimensional sound field and generating cancelling sound, according to an inverse of the transfer characteristic, to cancel the white noise and prevent noise being output from the other end of the one-dimensional sound field; continuously preventing the noise output and measuring the characteristic data of the one-dimensional sound field at, at least, one measuring point in the one-dimensional sound field; and calculating the transfer function of the one-dimensional sound field in the noise-output-prevented state, according to the characteristic data of the sound field.
REFERENCES:
patent: 4677676 (1987-06-01), Eriksson
patent: 4736431 (1988-04-01), Allie et al.
patent: 5010576 (1991-04-01), Hill
patent: 5192918 (1993-03-01), Sugiyama
patent: 5224168 (1993-06-01), Martinez et al.
patent: 5251262 (1993-10-01), Suzuki et al.
patent: 5251263 (1993-10-01), Andrea et al.
patent: 5257316 (1993-10-01), Takeyama et al.
patent: 5267320 (1993-11-01), Fukumizo
patent: 5347586 (1994-09-01), Hill et al.
Hiroshi Yasukawa,"An Acoustic Echo Canceller with Sub-Band Noise Cancelling", IEICE Trans. Fundamentals, vol. E75-A. No. 11 Nov. 1992 pp. 1516-1523.
I. Pitas et al., "Adaptive L-Filters" European Conference on Circuit Theory and Design, Sep. 1989, pp. 580-584.
Prashant P. Gandhi et al. "Design and Performance of Combination Filters for Signal Restoration", IEE Transactions on Signal Processing, vol. 39. No. 7, Jul. 1991, pp. 1524-1540.
Amlan Kundu et al. "Double-Window Hodges-Lehman (D) Filter and Hybrid D-Median Filter for Robust Image Smoothing", IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 37, No. 8. Aug. 1989, pp. 1293-1989.
Fujii Kensaku
Ohashi Tadashi
Ohga Juro
Fujitsu Limited
Isen Forester W.
LandOfFree
Method and apparatus of determining the sound transfer character does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus of determining the sound transfer character, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus of determining the sound transfer character will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-349035