Method and apparatus for synchronizing the readout of a sequential media device with a separate clocked device
US5291468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1991 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Sep 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/10814
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for controlling the readout rate of information from a sequential storage medium, such as a CD-ROM, to maintain synchronism between the device containing the medium and an independent receiver receiving the information. Information is loaded from the media into a buffer at a rate controlled by pulses from a device clock. Information is unloaded from the buffer for utilization by the receiver independently of the loading of the buffer. The amount of free space available in the buffer is measured as information is loaded into the buffer. The rate of the clock is dynamically adjusted in response to the amount of free buffer space to maintain the full state of the buffer within predetermined limits. In this manner, the buffer never empties or fills in response to the unloading by the independent receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.