PURPOSE: To obtain a reproduced image having high S/N and high definition, by adding signals having bi-directional overshoot and preshoot to video signals and making recording when the level of the video signals changes.
CONSTITUTION: Differentiation circuits 10 and 11 at the recording side differentiate inputted signals and a non-linear circuit 14 non-linearly changes the amlification degree of the inputted signals in accordance with their signal levels. Moreover, differentiation circuits 30 and 31 at the reproducing side differentiate inputted signals and a non-linear circuit 34 lowers the high-frequency component of video signals and, when the level of the video signals is low, performs de- emphasis operations, such as enlarging the degree of attenuation of the high- frequency component, etc. Since overshoot and preshoot are added to thus reproduced video signals before recording, reproduced videos having high S/N and definition can be obtained even after the noise component is cut off.
JPS563416A | 1981-01-14 | |||
JPS60157491A | 1985-08-17 |