Multi-bandwidth optical playback apparatus with elongated read s

Details Multi-bandwidth optical playback apparatus with elongated read s Multi-bandwidth optical playback apparatus with elongated read s

1981-03-10

1983-02-22

Stellar, George G.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369116, 369117, 369118, 369 13, G11B 700, G11B 718, G11B 2736, G11B 1118

Patent

active

043750966

ABSTRACT:
Recovery from a record of data recorded in an elongated information track, comprising undulations representative of the data is effected by an optical playback system. In the system, the data is recorded within two substantially different frequency bands. The optical playback system has a dual response characteristic to provide improved response at the two different frequency bands. A modifying means interposed in the light beam path shapes the light beam to effect this dual response characteristic (i.e., two different bandwidth responses).

REFERENCES:
patent: 3842194 (1974-10-01), Clemens
patent: 4044379 (1977-08-01), Halter
patent: 4065786 (1977-12-01), Stewart
patent: 4125859 (1978-11-01), Oshida et al.
patent: 4179708 (1979-12-01), Sheng et al.

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