Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1990-08-23
1992-07-07
Isen, Forester W.
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
G10K 1116
Patent
active
051290030
ABSTRACT:
An apparatus includes an electro-acoustic converter, a detector, a noise correlative signal generator, and an additional tone signal generator in order to actively control noise generated by an electromagnetic machine, which noise is apt to externally leak from an opening of a machine room storing the electromagnetic machine driven by an AC power supply. The electro-acoustic converter applies a predetermined sound wave to the opening of the machine room. The detector essentially detects a frequency of an AC voltage waveform to be applied to the electromagnetic machine driven by the AC power supply. The noise correlative signal generator generates generating a signal correlative with an electromagnetic noise component included in noise generated by the electromagnetic machine according to a detection signal from the detector. The additional tone signal generator generates, according to an output signal from the noise correlative signal generator, an additional tone signal for causing the electro-acoustic converter to apply a sound wave essentially having a phase opposite to and the same amplitude as those of the electromagnetic noise component at the opening of the machine room.
REFERENCES:
patent: 4417098 (1983-11-01), Chaplin et al.
patent: 4989252 (1991-01-01), Nakanishi et al.
IEICE (Institute of Electronics, Information and Communication Engineers of Japan) Technical Report vol. 88 No. 105; Jun. 30, 1988.
Motorola Semiconductor Technical Data DSP56200 pp. 1-5.
Isen Forester W.
Kabushiki Kaisha Toshiba
LandOfFree
Active noise control apparatus for domestic appliance does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Active noise control apparatus for domestic appliance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active noise control apparatus for domestic appliance will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1835837