Abstract

AbstractIn sampled‐value transmission such as TAT where pixel values are transmitted, the transmission characteristics must be equalized so that the transmission distortion caused by the interference between sampled values is reduced below the detectable limit or tolerable limit. This paper considers the situation where the image signal bandwidth compressed by subsampling is to be transmitted by baseband or VSB transmission.The analysis and computer simulation for the transmission distortion are presented. The relation of the maximum transmission distortion to the deviation of the frequency characteristics or the deviation of resampling timing of the transmission system is examined quantitatively. The detectable limit and the tolerable limit of the distortion, for the case where the distortion spreads by the interpolation, are determined by subjective experiment. Their relation to the compression ratio and interpolation scheme is examined.The following properties were obtained. The maximum distortions are nearly the same for the transmitted and interpolated pixels, independently of the bandwidth compression ratio and the scheme of compression. The detectable limit and the tolerable limit become smaller with the extent of compression, imposing more severe requirements on the transmission characteristics. The effect of the interpolation scheme is small.

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