Circuit arrangement for identifying the type of an optical record carrier
US5202874A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1991 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Jun 21, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit arrangement for detecting and recognizing the type of optical recording medium being scanned, in which a high pass filter is connected in series with a rectifier. The high pass filter receives a data signal containing information stored in the recording medium. A low pass filter has an input which receives also the data signal. The first input of a comparator is connected to the output of the rectifier, whereas the rectifier has an input connected to the output of the high pass filter. A second input of the comparator is connected to an output of the low pass filter, and a controls processor is connected to an output of the comparator. A second comparator may be provided with a first input connected to the output of the rectifier, whereas the second input of the second comparator is connected to a reference voltage. The output of this second comparator is also connected to the controls processor which recognizes the type of recording medium being scanned from the outputs of the comparators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.