Rapid method of digital automatic gain control
US4807167A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Mar 18, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H1/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of digital automatic gain control does the required circulation without numerical multiplication or division and makes possible fast process control using a digital AGC. A signal channel has a digitally programmable variable gain device such as a multiplying digital-to-analog converter; the gain control input of the variable gain device is adjusted periodically to keep the exponential average of the digitized channel output signal with a given time constant at a desired average signal level. For instance, the vibration signal generated by a cutting process is held at a desired average prior to vibration pattern analysis to detect tool breakage and tool touch to a workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.