Automatic calibration for D.C. transducers
US4459475A · kind A · utility
15Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1982 |
| Grant date | Jul 10, 1984 |
| Priority date | — |
| Expiry date | Mar 29, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3015
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and system for automatically calibrating a D.C. transducer are described in the environment of an illustrative film retrieval system. In this system, the output of a transducer such as a light sensor is amplified and the amplified output is compared to upper and lower limits within which it is desired to hold the transducer's amplified output. When either of the limits is exceeded, the amplification of the transducer's output is varied so as to shift its average value to a value which is between the upper and lower limits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.