| 摘要 |
The invention concerns the method and arrangements for registering and playback of video information in the form of a frequency-modulated signal on an information storage element. By using the registering method and an apparatus for implementing it, video information in the form of a frequency-modulated signal 92 is stored on the information storage element 10, having its information content in the form of a carrier signal with frequency changes over time, which vary from a centre frequency. The frequency-modulated signal 92 occurs as a linear sequence of first and second markings 38 situated in track-like manner on the storage element's surface 24. In a preferred embodiment of the invention, the linear sequence of first and second markings 37, 38 is in alternating relationship. The first type of markings reflect light in non-specular manner. The second type of markings reflect light in specular manner. The length of the specular light-reflecting regions and the non- specular light-reflecting regions represents consecutive half-periods for each whole period of a frequency- modulated signal. The length of these regions varies in inverse proportion to the momentary frequency of the frequency-modulated signal. In this way, the length of the specular light-reflecting and the non-specular light- reflecting regions is a representation in space of the frequency-modulated signal. <IMAGE> |
