Most of the positive modulation television systems ceased operation by the mid-1980s.
2.
This was not possible for many years with positive modulation as the peak carrier power varied depending on picture content.
3.
Older televisions for positive modulation systems were sometimes equipped with a peak video signal inverter that would turn the white interference spots dark.
4.
Impulsive noise, especially from older automotive ignition systems, caused white spots to appear on the screens of television receivers using positive modulation but they could use simple synchronization circuits.
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Positive modulation was one of several unique technical features that originally protected the French electronics and broadcasting industry from foreign competition and rendered French TV sets incapable of receiving broadcasts from neighboring countries.
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