Device for transmission of information by pulse code frequency shift modulation
US4053836A · kind A · utility
6Cited by
8References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1975 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Aug 13, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/152
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A device for transmission of information by pulse code frequency shift modulation. The device incorporates a phase-locked superheterodyne receiver including a single voltage controlled oscillator, and a demodulator including a phase comparator and a phase shifter. The intermediate frequency is equal to one half the input signal frequency shift. The comparator compares the phases of the intermediate frequency signal and of a signal of the same frequency derived from the voltage controlled oscillator to provide a message output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.