Automatic noise rejection for use in scanner and the like
US4433304A · kind A · utility
5Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1981 |
| Grant date | Feb 21, 1984 |
| Priority date | — |
| Expiry date | Aug 19, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/20
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a system such as an ultrasonic scanner in which a signal must be variably amplified with time in response to a time gain control (TGC) signal, automatic noise rejection is provided by periodically comparing amplified noise with a threshold value above which noise interferes with signal analysis. TGC signal control of a variable amplifier is permitted so long as the amplified noise is less than the threshold value. A maximum control voltage, V.sub.n, is applied to the variable amplifier when the amplified noise exceeds the threshold level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.