Norikazu Sawazaki

Magnetic reproduction system utilizing magnetic body as capacitor

A capacitance element includes as an interelectrode substance a magnetic body for detecting a magnetic field formed by a magnetic recording medium. A tuned circuit includes the capacitance element as a tuning element and receives a signal from a high-frequency oscillator. The magnetic characteristics of the magnetic body change with changes in the magnetic field formed by the magnetic recording medium. The high-frequency signal output from the tuned circuit changes with changes in the magnetic characteristics of the magnetic body. A detecting circuit detects the changes in the high-frequency signal output so as to reproduce signals recorded on the magnetic recording medium.

Color Video-Tape Recorder for Home Use

A system for home-use color video-tape recording, called the pilot NTSC system, has been developed. The recorder has been designed to avoid difficulties with frequency bandwidth, jitter, bulkiness and high cost of equipment. A method has been developed to fit the color signal of NTSC within the effective VTR bandwidth, recording it after frequency modulation and inverting it on the reproduction side to 3.58 MHz. A pilot signal has been used as a color standard to avoid jitter. Experimental results of the VTR are described.