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...http://www.google.fr/patents/US4538255?utm_source=gb-gplus-shareBrevet US4538255 - Method of and system for cutting a phonograph record with two-channel modulation
Method of and system for cutting a phonograph record with two-channel modulation
