Modulation Frequencies in Visual Transmission

A method of computing the maximum frequencies produced in television transmission is shown. This method is based on the consideration of the degree of edge definition produced. It is shown that these frequencies are independent of the amount of detail in transmitted pictures for equal edge definition. For a picture scanned by the usual method N pictures per second, with L lines, having a ratio r of width to height and having the ratio K between the width of scanning line and width of edge shadow, it is shown that KNrL' 2 Two systems varying from the normal are discussed and compared with the normal system in regard to the magnitude of the frequencies produced.