![]() The videotape playback system is similar in principle to that used by 8mm movie film. ![]() Other formats vary slightly, but the magnetic recording principle is the same. ![]() If you were able to see the magnetic impulses on a recorded VHS videotape, they would look like a series of diagonal stripes down the middle, sandwiched between two linear stripes along the edges of the tape. The tape itself is simply a precision coating of magnetic oxide bonded to a long plastic strip. The image, the sound and the timing signals are invisible magnetic pulses on the tape. The tape looks the same whether or not it has video information on it. On videotape, these three components are not visible to the eye. The physical distance relationship between these three components is essential for the proper recording and playback of the film. The timing is the punched holes on the other edge of the film. The sound is a brown magnetic strip that runs along one edge of the film. The images are small squares that look like a series of miniature photographs. If you examine a movie film, you can easily see these three components. ![]() Whether we use film or videotape to preserve our memories, we need to store three basic components: the image, the sound and the timing signal. The best analogy I can think of is the home 8mm sound movie films that were popular in the late seventies. And given the choice between knowledge and ignorance, you’d always choose the former, right?Īn explanation of how the tape transport system works requires a visual analogy to better understand the process. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |