Noise canceling method

Details Noise canceling method Noise canceling method

1993-07-13

1995-04-25

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, H03B 2900

Patent

active

054106060

ABSTRACT:
A noise-canceling method for simultaneously canceling a plurality of harmonic components of the engine rotational speed contained in engine noise. Reference signals are generated in correspondence with a plurality of harmonic components, and an adaptive signal processing is executed by using each reference signal, a composite-sound signal of the engine sound and a composite noise-canceling sound at a noise-canceling point, thereby generating a noise-canceling signal. The noise-canceling signal is input to a speaker. The reference signal corresponding to a harmonic component of a low level is multiplied by a constant K before it is input to the speaker so as to approximately equalize the levels of all the harmonic components at the noise-canceling point.

REFERENCES:
patent: 5222148 (1993-06-01), Yuan
Dorf, Richard C., Modern Control Systems (Jan. 1992) p. 66.

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