The sampled portions of the analog video signal filtered by {HEAD ~ the filters} are provided to a four to one multiplexer which is coupled to {TAIL ~ the controller} 
The sampled portions of the analog video signal filtered by { HEAD ~ the filters } are provided to a four to one multiplexer which is coupled to { TAIL ~ the controller }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL