Designation of a video signal, part of which (spikes or the sync tip) goes below black level transition. Usually, such signals (besides the sync), are undesirable within the video signal. They appear, however, due to image enhancement or poor transition response of the video amplifier or processor. If the signal excursions below black level are small, they can be ignored. If they are too large, approaching sync tip level, image instability might occur, as the blacker than black spikes may be interpreted as sync pulses. Sometimes those excursions are deliberately created for image enhancement and special effects and copy protection purposes. Digital processing can handle some blacker than black signals.
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