Analyzing television coding techniques using three-dimensionalsignal analysis

摘要

An understanding of the three-dimensional (3-D) nature of antelevision signal and its spectrum has been commonly used as an aid innvisualizing and developing new analog coding techniques. Determining thenactual 3-D (spatio-temporal) characteristics of a television system is,nhowever, more difficult. This paper introduces a mathematicalnrepresentation for the spatio-temporal characteristics of a televisionnsystem. This representation is extended to include both time-invariantnand time-varying coding effects (e.g., aliasing, modulation), and thennsimplified into six useful functions. A piecewise-Fourier analysisntechnique is used to obtain the characteristics for several simulatedncoding techniques. Results are presented for conventional delay-linenPAL, I-PAL, and film-mode ColourPlus, in a 5-MHz transmission bandwidth