ray tube (CRT). The deflection circuit in a digital television use the sync portion of the digital video signal. The digital deflection circuits perform all necessary corrections for the deflection yoke and CRT system digitally, and generate the necessary output. Once converted to analog, the signals drive the deflection yoke and flyback transformer in the normal manner (similar to a conventional or analog TV.)With digital television, sensor circuits provide feedback information from the CRT system, while memories store information for desired performance (color, tint, etc.). The actual feedback from the sensors is compared to the memory data, and the correction signals are produced automatically to keep the CRT system producing the desired picture.Since all of these functions are under digital control in a digital TV, many of the alignment found in a conventional TV are unnecessary. Similarly, many circuit components such as inductors and capacitors (that cannot be incorporated into ICs) are not necessary.For example, many of the delay lines, filters, and phase shifters found in conventional TV are eliminated. instead, clocking circuit count precise times for sampling or out signals in digital TV. Also, by using a clock frequency four times that of the color subcarrier, all functions are at 90 degrees intervals of the color signal. This makes for easy hue changes in the color control system.Finally, because of fewer discrete components and more automatic digital functions, direct interfacing with external digital systems is made easier (without the usual A/D or D/A conversion. For example. direct interfacing to computers is possible, as well as direct interfacing to matrix or flat-screen TV displays.FINDINGS:The obvious finding in digital processing in the quality of the signals reproduced. As the case of compact discs, the tuner signals to be processed are sampled at high frequency, the sampled signals are stored by digital means and...
