[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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[in Japanese]

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[in Japanese]

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The uniformity oy three representative uniform color spaces (U^*V^*W^*, L^*u^*v^*. L^*a^*b^*) recommended by CIE was examined.
Color variations were subjectively evaluated by the rating method. The Kruskal methods of non-metrical multidimensional scaling was then used to convert these data to interval scales which were then converted to ratio scales.
Using these results, the distribution of color variations which give subjectively equal color differences in color spaces, were obtained.
The six measures of total uniformity, local uniformity, global uniformity, intra-axis uniformity, inter-axis uniformity and directional uniformity were introduced.
The uniformity in color spaces mentioned above was examined using these measures, and ways of improving the uniformity in color spaces were investigated.

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This paper deals with the theoretical analysis and the experimental results of the occupied bandwidth and signal to noise ratio in five AM stereophonic broadcast systems, Belar, Magnavox, Motorola, Harris and Kahn, which have been proposed in the United States.
Computation of the spectrum and the out-of-band radiation in the five systems are carried out with various input levels and frequencies, and the results are applied to the regulations in Japan.
The relative noise increace, for the case of comparatively low receiver-input level to which the noise output due to RF white noise is inversely propotional, is theoretically calculated, and is measured in five systems, showing that the signal to noise ratio of stereophonic broadcasting is about 3 to 4 dB worse than that of monophonic broadcasting.

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