An understanding of the three-dimensional (3-D) nature of a television signal and its spectrum has been commonly used as an aid in visualizing and developing new analog coding techniques. Determining the actual 3-D (spatio-temporal)characteristics of a television system is, however, more difficult. This paper introduces a mathematical representation for the spatiotemporal characteristics of a television system. This representation is extended to include both time-invariant andtime-varying coding effects (e.g., aliasing, modulation), and then simplified into six useful functions. A piecewise-Fourier analysis technique is used to obtain the characteristics for several simulated coding techniques. Results are presented forconventional delay-line PAL, I-PAL, and film-mode ColourPlus, in a 5-MHz transmission bandwidth.
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