This article will address CCIR System G, a topic that has captured the attention and interest of numerous people in recent years. CCIR System G has become a topic of relevance in today's society due to its impact in different areas, such as culture, politics and the economy. Throughout this article, the different aspects related to CCIR System G will be explored, analyzing its causes, consequences and possible solutions. The historical evolution of CCIR System G will be examined, as well as its influence on contemporary society. Likewise, different perspectives and approaches on CCIR System G will be presented, with the aim of offering a comprehensive and enriching vision on this topic of general interest.
625-line analog television transmission format
Analog TV systems global map, with System G in blue.
CCIR System G, also known as the "Gerber Standard", is an analog broadcast television system used in sixty countries around the world for UHF channels. System G is generally associated with System B for VHF.
Plan showing VHF frequency ranges for ITU Systems
At a CCIR Geneva meeting in July 1950, Dr. Gerber (a Swiss engineer), proposed a modified 625-lines system with a 7 MHz channel bandwidth (based on work by Telefunken and Walter Bruch). Known as the "Gerber Standard", it was initially approved for VHF broadcasts, and eventually adapted for UHF.
A frame is the total picture. The frame rate is the number of pictures displayed in one second. But each frame is actually scanned twice interleaving odd and even lines. Each scan is known as a field (odd and even fields.) So field rate is twice the frame rate. In each frame there are 625 lines (or 312.5 lines in a field.) So line rate (line frequency) is 625 times the frame frequency or 625•25=15625 Hz.
The RF parameters of the transmitted signal are exactly the same as those for System B which is used on the 7.0 MHz wide channels of the VHF bands. The only difference is the width of the guard band between the channels, which on System G is 1.0 MHz wider than for System B: in other words 1.15 MHz (assuming the worst case which is when NICAM sound is in use).
A few countries (Belgium, Luxembourg and Netherlands) use a variant of system G which is known as System H. System H is similar to system G but the lower (vestigial) side band is 500 kHz wider. This makes much better use of the 8.0 MHz channels of the UHF bands by reducing the width of the guard-band by 500 kHz to the still perfectly generous value of 650 kHz.