Control method of vertical scan speed
US4733308A · kind A · utility
190Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Aug 8, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/17
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When a document and a recording medium are moved in a vertical scanning direction to read the document and record signals on the recording medium, the read signals are stored in a line buffer memory. The present invention changes over hysteretically a high speed vertical scan mode and a low speed vertical scan mode in accordance with the number of the buffered code bits in the line buffer memory to read the document and record the signal on the recording medium. Thus, the present invention reduces the number of stops of vertical scan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.