Method and apparatus for synchronizing and calibrating a receiver to a pulse width modulation transmitter
US4327441A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1980 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Mar 31, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4902
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improvement in a communication system is disclosed having a transmitter which transmits a pulse width modulated control signal having a synchronizing pulse, a reference pulse, and at least one control function pulse encoded therein. At least one receiver receives the transmitted control signal and detects the pulses encoded therein. In response to each detected pulse, a timing circuit in each receiver provides a timing pulse having a width related to a reference signal. A reference controller compares the width of the detected reference pulse to the width of the timing pulse and provides a reference calibration signal at a level automatically selected to reduce the compared pulse width difference. A function controller may be provided to compare the width of the detected control function pulse to the width of the timing pulse, and to perform a control function in response to a predetermined compared width difference therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.