Abstract: In order to eliminate crosstalk and to provide a high recording density, a method for recording information on a recording disc includes a first step for forming a first portion of recording tracks in which the information signal is recorded on the recording disc under a condition that the angular velocity of rotation of the disc is constant and a space between each track has a first constant value. A second step in values forming a second portion of recording tracks in which the information signal is recorded on the recording disc under a condition that the angular velocity of rotation of the recording disc is varying and the space between each track has a second constant value that is greater than the first constant value. The first and the second portions of the recording tracks are formed alternately.

Abstract: A time base correction device for use with a video disc reproduction system corrects the time base of the color video signal according to the phase difference between a reference signal and a color burst signal; and the time base of the audio signal is corrected according to the phase difference between a reference signal and a horizontal synch signal extracted from the video signal.

Abstract: A two-way CATV system having a substantial number of terminals incorporates a central processor and transmitter system which continually interrogates the terminals at high speed, monitoring changes of usage of premium programs and other data while also permitting central control of access to restricted premium programs. For inexpensive but reliable intercommunication, short, fixed word length digital messages are frequency multiplexed onto the cable in both upstream and downstream directions, and subscriber groups are controllably selected in turn, with each subscriber being scanned in what may be an arbitrary order by transmission of unique private messages which are recognized at the terminal and in response to which previously prepared fixed length messages are immediately transmitted in return.