Data recording and transmission apparatus utilizing non-consecutive zero coding
US3996613A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1975 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Oct 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1426
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention is described in the environment of a binary data magnetic recording and reproducing system and comprises a binary to non-consecutive zero code converter for encoding the input binary data into a non-consecutive zero code which, in turn, is recorded on the magnetic medium. In recording, a flux transition occurs for each ONE of the non-consecutive zero code. A bipolar peak detector detects the flux transitions and thus detects the presence of the recorded ONEs. The peak detected signals are utilized to continuously trigger a mono-stable multivibrator having a period whereby the multivibrator relaxes to its stable state in the absence of a ONE which denotes the presence of a ZERO. The peak detected signal and the output of the mono-stable multivibrator are utilized to synthesize a clock signal from the recorded non-consecutive zero data. The recorded data is applied to a non-consecutive zero code to binary converter which is synchronized by the data derived clock to recover the originally recorded binary information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.