Magnetic data recording apparatus using pulse position modulation
US5856889A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1995 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Jul 24, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic data recording apparatus magnetically records various items of data on a film in accordance with a feed of the film by a PPM Pulse Position Modulation (PPM) recording method. The apparatus includes a PPM signal converting circuit for converting the data to be recorded into a PPM signal and outputting the PPM signal, a magnetic head and a head driving circuit for driving the magnetic head on the PPM signal outputted from the PPM signal converting circuit. The apparatus further includes a data quantity calculating circuit for calculating a quantity of the data to be recorded during a feed of the film. The PPM signal converting circuit determines a change-of-signal position of the PPM signal within one period on the data quantity calculated by the data quantity calculating circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.