Frequency modulator having LC oscillator with switchable frequencies
US5506547A · kind A · utility
5Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1995 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Apr 4, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7755
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A frequency modulation circuit which varies the resonance frequency of an LC resonance circuit, and which corresponds to the frequency modulation conversions of all TV methods with a simple constitution. Each of a plurality of passive element series circuits for varying a time constant of the LC resonance circuit is composed of, for instance, a capacitor and a resistor, which is switched and controlled by connecting to or separating from the LC resonance circuit by a switching circuit such as a transistor. Thereby, the oscillation frequency of the LC resonance circuit can be easily converted to a predetermined frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.