Recording and playback modulation method and apparatus
US4186411A · kind A · utility
4Cited by
18References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1977 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Jul 1, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Overlapping, minute regions of magnetization in a recording medium, which are produced during recording and cause distortion of the played back signal, are reduced by encoding the signal in a pulse signal. The time between pulses is varied according to the amplitude of the signal to be recorded, and when this pulse signal is recorded, the minute regions are reduced to elemental size. Thus they overlap less and do not distort the reproduced signal by offsetting the zero level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.