Method and system for suppressing noise induced in a fluid mediu

Details Method and system for suppressing noise induced in a fluid mediu Method and system for suppressing noise induced in a fluid mediu

1993-09-02

1994-10-25

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, G10K 1116

Patent

active

053596633

ABSTRACT:
A method of detecting the onset of turbulence in connection with a body mng through a fluid medium and reducing turbulence noise in acoustic sensor systems carried thereby. First, the body is supplied with sensors each for generating a signal suitable for measuring amplitude of pressure fluctuations of the medium proximate a region of said sidewall of the body in at least a region of the body in which turbulence is expected to occur. During a reference stage during which the body moves through the fluid medium when it is known that turbulence is occurring around at least a portion of said body, the sensors each generate reference temporal pressure data representing fluctuations in pressure of the fluid medium around said body. In response to reference temporal pressure data generated by sensors in a turbulence zone at which turbulence is occurring and sensors in a transition zone between the turbulence zone and a laminar flow zone, method-of-delay phase portraits are generated for a progression of selected delay intervals. During an operational stage, the signals from the sensors are filtered to generate a portion representing the turbulence due to motion of the body through the medium and a portion representing signals from external acoustic signal sources, and the turbulence signal portion is used to generate signals of appropriate phase which are injected into the medium to reduce the turbulence noise signals.

REFERENCES:
patent: 4689821 (1987-08-01), Salikuddin et al.
patent: 4715559 (1987-12-01), Fuller
patent: 5245664 (1993-09-01), Kinoshite et al.
patent: 5295641 (1994-03-01), Kaptein

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