Digital synchronization of broadcast frequency
US5867536A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1997 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Feb 11, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B23/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dynamic, self adjusting synchronization system for real time control of the frequency and bandwidth of a modulated signal includes a voltage controlled oscillator for generating a carrier signal to be modulated having a predetermined frequency and bandwidth. There is an adjustment device having a center frequency adjustment circuit for providing a voltage level to the voltage controlled oscillator. A modulation generator generates a modulation signal for modulating the carrier signal to produce a modulated carrier signal and a co-generated measurement signal synchronized with the modulation signal. There is a device for selectively inhibiting the modulation signal. A measurement device includes a counter device to selectively count the pulses of the modulated carrier signal for a first predetermined period of time and counting the pulses of the carrier signal for a second predetermined period of time while the modulation signal is inhibited and a measurement circuit, responsive to the co-generated measurement signal, to synchronously define the first predetermined period of time during which the modulated carrier pulses are counted and is responsive to a timing signal to define t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.