Digital differential phase shift keyed modulator
US4008373A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1975 |
| Grant date | Feb 15, 1977 |
| Priority date | — |
| Expiry date | Oct 3, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2092
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital control circuit means responsive to a timing signal and a phase shift control signal accepts digital dibits of data and generates a digital control output signal. A digital phase shifter coupled to the control circuit and responsive to a timing signal generates a main and a secondary channel digital output signal alternately at a first and a second output terminal during successive dibit intervals. The main channel digital output signal is phase shifted a predetermined amount with respect to a main channel digital output signal generated during a preceding dibit interval in response to said digital control output signal. A multiplexer coupled to the first and second output terminals of the phase shifter transmits the main channel digital output signal on a third output terminal and the secondary channel digital output signal on a fourth output terminal. A digital number generator coupled to the third and fourth output terminals and responsive to a timing signal generates a series of digital output signals representative of a predetermined analog magnitude. A digital to analog converter converts the digital output signals from the digital number generator into a differenti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.