Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1994-04-28
1996-02-06
Epps, Georgia Y.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
369 59, 369 54, 369 32, G11B 700
Patent
active
054901278
ABSTRACT:
This invention relates to an optical disc apparatus and the evaluating method of the optical disc apparatus, which emits the light beam to the disc typed recording medium to sequentially form pits and records the desired data, and the asymmetry, etc. can be detected rapidly and surely. The peak value and the bottom value of the reproduced signal are sequentially held to detect the minimum value and the maximum value of the held result, and then the recording system, the characteristics of the disc typed recording medium, or the reproducing system can be evaluated based on the detected result.
REFERENCES:
patent: 4466089 (1984-08-01), Wachi
patent: 5070495 (1991-12-01), Bletscher, Jr. et al.
patent: 5216660 (1993-06-01), Iimura
patent: 5226027 (1993-07-01), Bakx
patent: 5268893 (1993-12-01), Call et al.
patent: 5353270 (1994-10-01), Iimura
Patent Abstracts Of Japan, vol. 14, No. 230 (P-1048), 16 May 1990 of JP-A-20 54 424 (Nippon Columbia), 23 Feb. 1990.
U.S. Pat. application Ser. No. 07/980,488 Timura filed on Nov. 23, 1992.
Ito Hiroyuki
Ohta Shinji
Dinh Tan
Epps Georgia Y.
Sony Corporation
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