Movement-detecting processing circuit for an ultrasonic detection system
US4197528A · kind A · utility
9Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1978 |
| Grant date | Apr 8, 1980 |
| Priority date | — |
| Expiry date | Apr 17, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/90
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A transmitter/receiver supplies echo signals to an amplifying circuit incorporating an attenuator, whereby the circuit has a variable amplification factor tending to compensate for reducing magnitude of the amplitudes of the echo signals with distance of detected objects from the transmitter/receiver. The area of detection is divided into alternate active and inactive zones radiating outwardly from the transmitter/receiver, the amplified echo signals emanating from objects in the active zones during a given operating cycle are integrated and the total output is compared with the corresponding total for the preceding cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.