The 567-line television system was an experimental late 1940s[1][2][3] proposal by Philips of the Netherlands for a European television system, with some test transmissions being made from Eindhoven.
The first mention of the system appeared in an article from 1938, published in the Philips' technical bulletin, on a transportable demonstration TV station, running an at 50 fields (25 frames) per second,[4] but no more details were provided.
[5] Most of the technology was to be borrowed from the American 525-lines system, the difference being the reduction of horizontal scan frequency from 15,750 to 14,175 Hz.
By 1950 some 567-line television sets were built and distributed to Philips employees for home testing.
Russian engineers had already shown how 525-lines could be easily adapted to a higher resolution by breaking with American 6 MHz channel bandwidth restrictions and moving the sound carrier up from 4.5 to 6.5 MHz, along with 625-line scanning.