Extracts the timing information from PAL SECAM or NTSC encoded video signals having standard negative going sync & amplitudes from 0.5V to 2VIC outputs the composite sync vertical sync burstback porch timing & an odd even field identifier By changing the value of R2 non-standard faster horizontal rate video signals can also be stripped. The vertical sync output is produced on the rising edge of the first serration in the vertical sync period but if the rising edge does not occur within the internally set period a default vertical output is produced permitting use with video games & home computers. The IC can be used as a master gen-lock to provide timing references for the extraction of data on specific scan lines to restore the original video waveform for remodulation or retrieve the colour burst & decode into R.G.B. components or to identify individual scan lines in the video signal. Parts list