567-line television system
An experimental broadcast, and a proposal by Philips of the Netherlands, was a 567 line television system for Europe, running at 50 fields (25 frames) per second.[1]
Most of the technology was to be borrowed from NTSC, the difference from NTSC being the reducing of the horizontal scan frequency from 15750 to 14175 Hz.[2]
This would have meant that the NTSC sound carrier frequency of 4.5 MHz above the picture carrier, would have also been the standard for Europe, and hence been a lot more common world wide.
| System | Lines | Frame rate | Channel bandwidth (in MHz) | Visual bandwidth (in MHz) | Sound offset | Vestigial sideband | Vision mod. | Sound mod | Aspect ratio | Effective resolution (4:3). |
|---|---|---|---|---|---|---|---|---|---|---|
| 567 Line | 567 | 25 | 6 | 4.2 | +4.5 | LSB cut @ -0.75 MHz | Neg. | FM | 4:3 | 740 x 485 (theoretical) |
The proposal was defeated as Russian engineers had already shown how NTSC could be easily adapted to a higher resolution by breaking with NTSC bandwidth restrictions, and moving the sound carrier up 2 MHz from 4.5 to 6.5 MHz, along with 625 line scanning.
References
- "Philips Netherland 567 line TV Standard" (in German). Radiomuseum.org. Retrieved 2011-06-20.
- "Philips 567 Zeilen Standard - The Philips 576 line TV system". Scheida.at. 1951-10-02. Retrieved 2011-06-20.