SIGMA (verification service)
Encyclopedia
SIGMA is an electronic verification service offered by Nielsen Media Research
and is generally used for commercials, infomercials, video news releases, public service announcements, satellite media tours, and electronic press kits. It operates by encoding the SIGMA encoder ID, date of encoding, and time of encoding in lines 20 and 22 of the video signal, which is outside of the area displayed on a normal television screen (this is similar to how closed captioning is transmitted). On a professional video
monitor with underscan capability activated or a computer display of the entire video frame, the SIGMA data will look like small, moving white lines at the top of the frame. Nielsen provides overnight reports of airplay in all television markets in the country.
Nielsen Media Research
Nielsen Media Research is an American firm that measures media audiences, including television, radio, theatre films and newspapers...
and is generally used for commercials, infomercials, video news releases, public service announcements, satellite media tours, and electronic press kits. It operates by encoding the SIGMA encoder ID, date of encoding, and time of encoding in lines 20 and 22 of the video signal, which is outside of the area displayed on a normal television screen (this is similar to how closed captioning is transmitted). On a professional video
Video
Video is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion.- History :...
monitor with underscan capability activated or a computer display of the entire video frame, the SIGMA data will look like small, moving white lines at the top of the frame. Nielsen provides overnight reports of airplay in all television markets in the country.