System for extending the playing time of video cassettes

Details System for extending the playing time of video cassettes System for extending the playing time of video cassettes

1975-08-27

1977-08-02

Caldwell, John W.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 10, G11B 1544

Patent

active

040401014

ABSTRACT:
A system is provided for extending the playing time of standardized video cassettes. The system utilizes a rotating head drum having mounted thereon a first set of video heads displaced 180.degree. with respect to each other, a second set of video heads displaced by a certain amount from 180.degree. with respect to each other, a rotating winding of a transformer, and relays to interconnect the heads of either the first or second set of heads with the rotating winding as the head drum rotates. The relays are controlled by stationary coils and logic to respond to the setting of switches to enable the system to operate at normal tape speed via the first set of heads or reduced tape speed via the second set of heads without requiring any change in the speed of rotation of the head drum.

REFERENCES:
patent: 3294902 (1966-12-01), Maxey
patent: 3772468 (1973-11-01), Tatsughchi
patent: 3911486 (1975-10-01), Hibbard

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