[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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This paper introduces a new approach to composite coding of the NTSC color TV signal, i. e., interfield and intrafield adaptive prediction coding. Firstly, the advantages of this prediction scheme are clarified theoretically in comparison with an interframe prediction. A 30 Mbit/s codec, based on this idea, and its performances are then presented. Field test results of color TV transmission by the codec through an Intelsat satellite are also described, showing that the picture quality is satisfactory and a little better than that by the FM transmission method now commercially used in the Intelsat system.
This adaptive prediction gives very good and stable prediction efficiency for still to violently moving pictures.

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A spiral scanning CRT display which has constant angular velocity and equi-interval between adjacent scanning lines is suitable to display polar coordinate data on CRT.
In this paper, we applied the spiral scanning CRT for directivity measurements of an antenna.
A detected signal with an antenna to be measured and a signal, which is proportional to rotating angle of the antenna and is obtained by a potentiometer, are transfered to the spiral scanning CRT. A train of pulses is produced when each scanning angle of a spiral coincides with rotating angle and are transfered to a brilliance modulation input of CRT through a gate. The gate is open during the time which is proportional to a level of the detected signal with the antenna. Therefore a vector of directivity of the antenna at some rotating angle can be plotted on CRT.
The directivity of a loop and a Yagi antennas were effectively measured by the spiral scanning CRT.

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