Frequency modulated modem transmitter
US4670888A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1985 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Nov 7, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency modulated transmitter including a reference frequency source providing a reference frequency to a phase locked loop circuit. The phase locked loop circuit provides a frequency output signal stabilized in accordance with this reference frequency and in accordance with a feedback signal. The phase locked loop circuit further includes a data input circuit that adjusts the output frequency in accordance with input data. Also included is the feedback circuit that provides the feedback signal to the phase locked loop circuit. This feedback circuit is derived from the frequency output signal. A synchronization circuit is connected to the feed back circuit and synchronizes the output of the feedback circuit with the reference frequency signal and the input data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.