Method for synchronizing scanning speed and data transmission speed of a scanner
US5760727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1996 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Aug 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for synchronizing scanning speed and data transmission speed of a scanner to eliminate a traditional memory buffer is disclosed. The scanner is connected to a host computer and comprises a charge coupled device (CCD) for converting a line image reflected from a document to be scanned into an array of analog signals. The CCD comprises an analog memory array for storing the analog signals. The method comprises the following steps of: PA1 a) outputting an analog signal from the analog memory array; PA1 b) converting the analog signal to a digital signal and transmitting the digital signal to the host computer; PA1 c) waiting until the host computer acknowledges receiving of the digital signal; and PA1 d) repeating steps a) to c) until all the analog signals stored in the analog memory array are processed and transmitted to the host computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.