G - Physics – 10 – K
Patent
G - Physics
10
K
G10K 11/16 (2006.01) G10K 11/178 (2006.01)
Patent
CA 2086926
A noise sound controller being capable of following a sudden change in a noise period, includes a differential signal calculation means 5 that calculates a differential signal between an output from a sound wave- electric signal converter 2 and an output from an adaptive filtering means 6, a transfer characteristics simulation means 4 that is inserted between the adaptive filtering means 6 and the differential signal calculation means 5, and simulates transfer characteristics of a system from the adaptive filtering means 6 to the differential signal calculation means passing through the electric signal-sound wave converter 3 and the sound wave-electric signal converter 2, a period-detecting unit 7 that detects the noise period of noise from a noise source 1, a period-adjusting unit 8 that varies the period of an output signal from the differential signal calculation means 5 depending upon an amount of change in the noise period, and a period detect/control means (10) that changes filter coefficients of the adaptlve filtering mens 6 depending on estimated change in the noise period.
Nagami Masaaki
Sako Kazuya
Fujitsu Ten Limited
Mcfadden Fincham
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