Noise subtraction filter

Details Noise subtraction filter Noise subtraction filter

1985-08-26

1987-02-10

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 83, 364422, G01V 140, H03K 501

Patent

active

046428003

ABSTRACT:
A filter for use in filtering noise from cyclical signals having a data component and a noise component in which a predetermined number of the cyclical signals are averaged to produce an average signature signal. The average signature signal is updated each cycle to produce a current updated average signature signal, and the current cyclical signals and the current updated average signals are subtracted from one another to remove the noise component and produce a residual signal which contains the data component. The time frames of the current cyclical signals and the current updated average signals are adjusted to be equal so as to enable point by point subtraction.
As an additional feature, the updating of the average pump signature combines a portion of the last average pump signature with a portion of the last residual signal.

REFERENCES:
patent: 4215425 (1980-07-01), Waggener
patent: 4513403 (1985-04-01), Troy
patent: 4523108 (1985-06-01), Niiho et al.

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