Method of and system for cutting a phonograph record with two-ch

Details Method of and system for cutting a phonograph record with two-ch Method of and system for cutting a phonograph record with two-ch

1983-10-21

1985-08-27

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

G11B 374

Patent

active

045382557

ABSTRACT:
A system for controlling the mean depth and spacing of V-grooves cut by a stylus in a phonograph disk for recording stereophonic sounds comprises a processing stage deriving first and second signal components, designed for the vertical and lateral deflection of a stylus support, from advanced left and right preview signals picked up from a storage medium about half a disk revolution ahead of the actual modulation signals. The first signal component is converted into a vertical-deflection signal, integrated with a relatively short time constant, which is admixed--directly and with a delay of one revolution--with the second signal component to produce, after combination with a basic incremental signal, a composite signal which is integrated with a relatively long time constant--on the order of the lead time of the preview signals--to provide a lateral-deflection signal controlling the horizontal shift of the stylus support; the vertical-deflection signal is also used, after a delay also substantially corresponding to that lead time, to control the motion of the stylus support perpendicular to the disk surface.

REFERENCES:
patent: 4348754 (1982-09-01), Haynes et al.

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