Pedestal height: The pedestal height is the distance between the pedestal level and the average value (dc level) axis of the video signal. This indicates average brightness since it measures how much the average value differs from the black level.

Blanking pulses: The composite video signal contains blanking pulses to make the retrace lines invisible by raising the signal amplitude slightly above the black level (75 per cent) during the time the scanning circuits produce retraces. The composite video signal contains horizontal and vertical blanking pulses to blank the corresponding retrace intervals. The repetition rate of horizontal blanking pulses is therefore equal to the line scanning frequency of 15625 Hz.

Line sync pulse: After the front porch of blanking, horizontal retrace is produced when the sync pulse starts. The fly back is definitely blanked out because the sync level is blacker than black. The nominal time duration for the line sync pulses is 4.7 µs. During this period the beam on the raster almost completes its back stroke (retrace) and arrives at the extreme left end of the raster.