Robin, Blecker & Daley
Reproducing apparatus with erasing device and erasing function based on frequency multiplexed and/or DPSK coded signal
 An erasing device for a magnetic video recorder is disclosed which includes a means for reproducing a code signal and a video signal from a magnetic medium. The code signal is discriminated to decide whether the video signal is a field video signal or a frame video signal. When the video signal is discriminated to be the frame video signal, the erasing device erases the video signal over a broader range than when the video signal is discriminated to be a field video signal. 
Canon Kabushiki Kaisha
H G H H G G
H04N G11B H04N H04N G11B G11B
inventional inventional inventional inventional inventional inventional
Shigeo Tokihiko Masahiro Yasutomo
Yamagata Ogura Takei Suzuki