Simulation for Magnetic Recording of Video Signal on Double Layered Media

Abstract

We incorporate a magnetization model into the finite element method to calculate the recording characteristics for a VTR signal. The fact that calculated results agree with measured ones shows that this method is effective in the analysis of VTR signal recording. In addition we use the Fourier transfer to analyze magnetization distribution. This analysis clearly shows that the appearance of a spurious signal is caused by a nonlinear magnetization process. We also show that a video luminance signal can be recorded on a medium surface and that a video chrominance signal can be recorded on the middle layer of a medium. Therefore, a double-layered medium having a high coercive force in the surface layer and a low coercive force in the underlayer, is effective for the recording of a signal with a wide frequency region. Moreover, a double-layered medium with a perpendicularly oriented surface is excellent for high density recording.