Adaptive gain control and method for signal processor
US3958213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1975 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Jan 3, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1663
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An adaptive gain control for a signal processor of an intrusion detection system comprises a circuit which utilizes the weighted summation of selected characteristics of sensed signals for producing optimum control of the gain of the circuit for discriminating between target and non-target signals more effectively. The parameters of signal envelope, envelope amplitude variance and signal frequency obtained from a processor such as that described in U.S. Pat. No. 3,696,369 are fed to a summing amplifier through resistors having weighted values calculated from previously recorded seismic signals obtained from several previously identified sites which, taken as a group, are representative of the type or types of sites in which the detection system is to be installed. The output of this summing amplifier is a control signal which is applied to a controlled instrumentality such as an amplifier or attenuator for optimizing signal level and thus enabling better circuit discrimination between target and non-target signals at a particular site. This invention further comprehends a method of processing signals for optimizing discrimination between desired and undesired signals by deriving se…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.