Demodulating circuit for self-clocking-information
US4344039A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1980 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Mar 5, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1423
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for demodulating either an MFM (modified frequency modulated) or an FM (frequency modulated) self-clocking-information signal is adapted to measure a time period corresponding to a signal reversion period and quantize the measured time period, whereby the quantized output determines a signal reversion period. Pulses of the number corresponding to the quantized output are generated and clock pulses for demodulating the original data are regenerated based on the above described pulses. In the case where the self-clocking-information signal is MFM, the original data is demodulated by reading the data regenerated based on the said pulses of the number corresponding to the quantized output based on the regenerated clock pulses. In the case where the self-clocking-information signal is FM, the original data is demodulated by reading the specified quantized output based on the above described regenerated clock pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.