Achieving the Optimum Picture Quality via Computer Aided Design Methods

Achieving good picture quality in the design of a television receiver is more of a design art than it is a strict technical science. The skills required of an engineer designing a television picture IF amplifier or a video amplifier not only include a thorough knowledge of electronic circuit design principles but also require a feel for the relationships between picture detail (as seen on the tube), electronic systems, and individual circuit components. That 'feel' for the proper amount of pre-shoot in the system's pulse response will dictate whether the picture is crisp or flat. In like manner, excessive over-shoot in the pulse response in either the picture IF or video amplifiers will lead to an ' unnatural' picture. The 'feel' for the proper pulse response as viewed on the picture tube illustrates the use of artistic qualities in television circuit design. This paper does not attempt to define the artistic aspects of television design but rather addresses itself to the problem relating the pulse response of the IF and video amplifiers to the individual circuit components.