Electrical measurement and noise suppression
US4163940A · kind A · utility
6Cited by
5References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1976 |
| Grant date | Aug 7, 1979 |
| Priority date | — |
| Expiry date | Apr 12, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/0053
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Electrical noise is suppressed on an input signal by squaring the input signal and any noise thereon, removing the sinusoidal terms in the squared output (as by averaging), subtracting the d.c. noise component, and taking the square root of the remainder, so as to produce an r.m.s. dependent, substantially noise free output. If desired, the noise suppression circuitry may be combined in a low signal measuring instrument in which the input signal is repetitively sampled and freed of noise in the manner described, the output then being measured on a d.c. meter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.