On channel agile FM demodulator
US5036291A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An on channel frequency agile PLL demodulator is provided using a precise and stable oscillator, such as a VCXO having its output frequency variable over a limited range. The output of the oscillator is multiplied by a multiplication factor to produce a mixing frequency. The multiplication factor scales the limited range of the oscillator to produce a proportionate mixing frequency deviation. A frequency synthesizer is used to enable the demodulator to detect signals on different channels. In one embodiment, the output of the frequency synthesizer is mixed with the scaled oscillator output to provide a mixing frequency having a fixed deviation for all channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.