| Autor: |
Ichiura, Shuichi, Tsuchiya, Yoichi, Hitoshi Terasaki, Hitoshi Terasaki, Osamu Ota, Osamu Ota |
| Zdroj: |
Japanese Journal of Applied Physics; March 1994, Vol. 33 Issue: 3 p1357-1357, 1p |
| Abstrakt: |
Development of a high-density multiple sub-Nyquist sampling encoding (MUSE) video disc with a playback time of 2 h per side has been achieved using an optical head which utilizes the superresolution technique and a green laser, and by quadrupling the recording density of the analogue video disc. The focused spot size of the main lobe in the superresolving direction of the optical head was 0.63 µ m ( 1/e2full width). With this optical head, using the slit detection method, a carrier to noise (CN) ratio of 56 dB was obtained at a pit length of 0.3 µ m which is the cut-off pit length of the 670 nm optical head. Compared with an optical head using only a green laser, the CN ratio at a pit length of less than 0.3 µ m was improved by 2 to 3 dB. An SN ratio of 41.5 dB was obtained for the quad- ruple ?300 mm MUSE video disc which has a 0.8 µ m track pitch and a 10.1 m/s linear velocity. |
| Databáze: |
Supplemental Index |
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