Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1993-07-21
1995-06-20
Kuntz, Curtis
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
A61F 1106
Patent
active
054267048
ABSTRACT:
A noise reducing apparatus which is particularly effective to reduce periodic noise with the construction simplified very much is disclosed. The noise reducing apparatus comprises a microphone, an adaptive filter for generating a signal to reduce noise inputted to the microphone, transfer characteristic compensation means for generating a signal to compensate for a transfer characteristic when the signal generated from the adaptive filter comes the microphone, a synchronizing pulse generation circuit for generating a pulse signal synchronized with the period of the noise, a pulse interval detection circuit for detecting the interval between pulses of the pulse signal, tap number changeover means for changing over the number of taps of the adaptive filter to a number with which the delay amount of a tapped delay line of the adaptive filter is equal to the interval detected by the pulse interval detection circuit, and a loudspeaker for generating sounds in response to the signal from the adaptive filter. Also a noise reducing apparatus suitable for with an automobile.
REFERENCES:
patent: 4677676 (1987-06-01), Erikkson
patent: 5022082 (1991-06-01), Erikkson et al.
patent: 5146505 (1992-09-01), Pfaff et al.
patent: 5245561 (1993-09-01), Sugiyama
English language abstract for Japanese Patent Application No. 3-178846.
Iidaka Hiroshi
Nohara Manabu
Shibata Eiji
Tamamura Manpei
Kuntz Curtis
Lee Ping W.
Pioneer Electronic Corporation
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