Тред №253078

Цитата: ER* от 07.09.2010 11:06:00
Стандарт 60 кадров/сек в начале 70-х - круто. Почему бы сразу не ТВЧ? Дадхи, если кто-то путает кадры и поля (полукадры), что от этого принципиально изменится? Стандарт NTSC? К чему постить всю эту хрень?  8)

Цитата
The CBS field-sequential system was an example of a mechanical television system because it relied in part on a disc of color filters rotating at 1440 rpm inside the camera and the receiver, capturing and displaying red, green, and blue television images in sequence. The field rate was increased from 60 to 144 fields per second to overcome the flicker from the separate color images, resulting in 24 complete color frames per second (each of the three colors was scanned twice, double interlacing being standard for all electronic television: 2 scans × 3 colors × 24 frames per second = 144 fields per second), instead of the standard 30 frames/60 fields per second of monochrome. If the 144-field color signal were transmitted with the same detail as a 60-field monochrome signal, 2.4 times the bandwidth would be required. Therefore, to keep the signal within the standard 6-MHz bandwidth of a channel, the image's vertical resolution was reduced from 525 lines to 405. The vertical resolution was 77% of monochrome, and the horizontal resolution was 54% of monochrome.

ЦитатаCBS purchased its own television manufacturer in April 1951 when no other company would produce color sets using the system.[6] Production of CBS-Columbia color receivers began in September,[7] and were first offered for retail sale in October.