Information recording disc recorded with signals at two different recording densities
US6038208A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information recording medium provides a first signal recording area (A) on which a first data is recorded, and a second signal recording area (B) which is a signal recording area outer from the first area in the radius direction, records a second data at a density higher than that of the first data, and wherein the second data includes the same contents of information as the first data. The recording density of the second data may be 2 to 10 times that of the first data. The sampling rate, the number of quantized bits, and the number of pixels of the second data may be more than the sampling rate, the number of quantized bits, and the number of pixels of the first data, respectively. The first data may be recorded at a fixed transfer rate, and the second data may be recorded at a variable transfer rate. A music signal of an audible band may be recorded for the first data, and a music signal up to an ultrasound band other than an audible band may be recorded for the second data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.