Circuit for generating two distinctive tone bursts with exponentially decaying envelopes
US4057769A · kind A · utility
3Cited by
3References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1976 |
| Grant date | Nov 8, 1977 |
| Priority date | — |
| Expiry date | Sep 14, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S331/03
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electrical signal generator comprises an electric wave oscillator for producing oscillations at one or other of two predetermined frequencies, an attenuator device for attenuating oscillations produced by the oscillator in a manner which varies over a period of time, and control means for controlling the oscillator to produce a burst of oscillations at one said predetermined frequency and a subsequent burst of oscillations at the other said predetermined frequency. The control means controls the attenuator device increasingly to attenuate the oscillations over the period of each burst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.