Sometimes I stumble across something that just boggles my mind. Such as this video that explains that Israel, the most technologically advanced country in the Middle East, wasn’t just slow to adopt color television, but actively fought its adoption, going so far as to create a device that stripped out color.
When a receiver is tuned to a monochrome transmission, the displayed scene should have no color components. However, if there is a hardware failure in the color killer stage, false color patterns may be displayed even during monochrome transmission.
In normal color reception, high frequency luminance is mistaken for color, causing relatively invisible false color patterns. The reason for this invisibility is due to a key feature of NTSC/PAL, chroma/luminance frequency interleaving, where these false patterns are in complementary colors for adjacent video frames, allowing the human eye to average out the false color patterns. If, during a monochrome transmission, a color killer failure allows the color processing to be activated when it shouldn’t, a chroma subcarrier in the color processing stages is regenerated with no reference, causing that subcarrier to have enough frequency error that the chroma/luminance interleaving feature of NTSC/PAL no longer works, allowing the aforementioned false color patterns, overlaying the otherwise monochrome picture, to be much more visible by the human eye….
In a color TV waveform, a reference pulse, called the burst, is transmitted along the back porch portion of the video signal. If the transmitted signal is monochromatic, then the burst is not transmitted. The color killer is actually a muting circuit in the chroma section which supervises the burst and turns off the color processing if no burst is received (i.e. when the received signal is monochromatic.) The main purpose of the color burst in the first place is a reference for the receiver to regenerate the chroma subcarrier, which in turn is utilized to demodulate the color difference signals….
The government ordered the Israel Broadcasting Authority to cease broadcasting in color. As it was impractical to remove the chrominance signal from programs previously recorded in color, this was accomplished by simply omitting the burst phase signal from the broadcast. The “damaged” signal triggered the “color killer” mechanism in color television sets which prevented the appearance of color pictures. This method was named Mehikon (Hebrew: מחיקון “eraser”).
Bureaucratic stubbornness kept Israeli broadcasts in black and white long after the vast majority of the world’s countries had switched over. Haiti, Bulgaria, Yemen and Oman all got color broadcasts before Israelis.
Bureaucratic inertia is quite a force…