In the late 1940s and early 1950s, Americans introduced tape recording technology developed by Germans, Danes, and Swedes before the Second World War into film recordings, making the film recording process of optical recording alone in the past very Great changes, from raw vocal material to mixed recording, have gradually changed to magnetic recording, while optical recording is only used to make a copy of the optical vocal chord. The key component of magnetic recording is the magnetic head, which converts the analog electrical signal of the sound into an analog magnetic signal and records it on a magnetic medium. There are two types of magnetic media for film recording: one is the magnetic film, which is the same size as the film, and also uses the film hole to transport the film, the difference is that the photosensitive coating is changed to a magnetizable magnetic coating layer, the commonly used magnetic disk width There are several types such as 35 mm, 17.5 mm and 16 mm. The second is the tape, which has no holes and is transmitted by friction. The most common is a 6.25 mm wide tape. In recent years, music recordings have also used 25.4 mm and 51.8 mm wide tapes; external environment sound recordings sometimes use 3.81 mm wide cassette tapes.
Magnetic recording is much more convenient than optical recording. It can be immediately reproduced and checked. If it is not satisfactory, it can be re-recorded, thus eliminating a series of photo-processing processes, which saves time and materials. The magnetic disk or tape does not need to be processed, and there is no possibility of sound distortion during processing, and the magnetic recording noise is small, the frequency bandwidth, the dynamic range is large, and the quality is high.
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