The DC Quadricorrelator: A Two-Mode Synchronization System
- 1 January 1954
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IRE
- Vol. 42 (1), 288-299
- https://doi.org/10.1109/jrproc.1954.274640
Abstract
The dc quadricorrelator is a new form of automaticphase-control circuit which, when applied to color synchronization, gives better performance and appears easier to manufacture than circuits previously used. It is intended to provide automatic color synchronization without need for a manually-operated frequency or phase control. The circuit combines good noise immunity with rapid pull-in, exceeding the capabilities of widely used earlier arrangements. Its performance and relative simplicity indicate a possible net reduction in over-all receiver cost. The DC Quadricorrelator also provides reliable, noise-immune, automatic switching of receiver circuits for monochrome or color operation. The dc quadricorrelator is a two-mode synchronization system in which the pull-in and hold-in modes of operation are made essentially independent of each other by means of a simple automatic switch. The basic principle, which is presented here in the environment of color synchronization, is also applicable to line and field synchronization for television.Keywords
This publication has 3 references indexed in Scilit:
- Color-Carrier Reference Phase Synchronization Accuracy in NTSC Color TelevisionProceedings of the IRE, 1954
- Mathematical Analysis of Random NoiseBell System Technical Journal, 1944
- Automatic Frequency and Phase Control of Synchronization in Television ReceiversProceedings of the IRE, 1943