| 摘要 |
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.
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