Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1992-07-28
1994-01-11
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
G10K 1116
Patent
active
052789136
ABSTRACT:
An active acoustic attenuation system prevents overdriving of the canceling output transducer or speaker (14) by shunting at least part of the correction signal (46) to a parallel shunt path (306) and away from the output transducer (14) Variable gains (308 and 310) are provided in the shunt path (306) and the input to the output transducer (14) for varying the ratio between the part of the correction signal (46) supplied to the output transducer (14) and the part of the correction signal (46) shunted to the shunt path (306). A first adaptive filter model (40) has an error input (202) from the error signal and outputs the correction signal (46). A second adaptive filter model (142) models the output transducer (14) and the error path (56) between the output transducer (14) and the error transducer (16). A copy (312) of the second model (142) has an input from the output (46) of the first model (40), and the output of the copy (312) is summed with the error signal (44) and the resultant sum is supplied to the error input (202) of the first model (40), such that the shunt path (306) is provided through the model copy (312).
REFERENCES:
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4677676 (1987-06-01), Eriksson
patent: 4677677 (1987-06-01), Eriksson
patent: 4736431 (1988-04-01), Allie et al.
patent: 4815139 (1989-03-01), Eriksson et al.
patent: 4837834 (1989-06-01), Allie
patent: 4987598 (1991-01-01), Eriksson
patent: 5022082 (1991-06-01), Eriksson et al.
patent: 5033082 (1991-06-01), Eriksson et al.
"Active Adaptive Sound Control In A Duct: A Computer Simulation", J. S. Burgess, Journal of Acoustic Society of America, 70(3), Sep., 1981, pp. 715-726.
"Number Theory In Science and Communications", Berlin: Springer-Verlag, M. R. Schroeder, 1984, pp. 252-261.
"Adaptive Filters: Structures, Algorithms, and Applications", Honig et al The Kluwer International Series in Engineering and Computer Science, VLSI, Computer Architecture and Digital Signal Processing, 1984.
Delfosse Kent F.
Steenhagen Shawn K.
Isen Forester W.
Nelson Industries Inc.
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