A video signal recording and reproducing apparatus comprises a first sampling circuit for sampling a recording video signal which has a band with an upper limit frequency f.sub.a and is to be recorded by a sampling signal having a frequency f.sub.s, where the frequencies f.sub.a and f.sub.s satisfying...http://www.google.com.au/patents/US4682250?utm_source=gb-gplus-sharePatent US4682250 - Apparatus for recording a video signal sampled at frequency f.sub.s and reproducing the video signal as a signal essentially sampled at frequency 2f.sub.s
