Any tape player can play a metal tape, however. A normal tape deck cannot record onto a metal tape - the deck must have a setting for metal tapes in order to record onto them. Sound quality improves as you go from one type to the next, with metal tapes having the best sound quality. Metallic particles rather than metal-oxide particles are used in the tape. The ferric-oxide particles are mixed with chromium dioxide. Type 2 - This is "chrome" or CrO 2 tape.Type 1 - This is standard ferric-oxide tape, also referred to as "normal bias.".Type 0 - This is the original ferric-oxide tape.The roller simply applies pressure so that the tape is tight against the capstan. The standard speed is 1.875 inches per second (4.76 cm per second). The capstan revolves at a very precise rate to pull the tape across the head at exactly the right speed. On the right are the capstan and the pinch roller, as seen below: The head in the center is the record and playback head containing the two tiny electromagnets. The head on the left is a bulk erase head to wipe the tape clean of signals before recording. These sprockets spin one of the spools to take up the tape during recording, playback, fast forward and reverse. When you look inside a tape recorder, you generally see something like this:Īt the top of this picture are the two sprockets that engage the spools inside the cassette. When you turn the tape over, you align the other half of the tape with the two electromagnets. The two heads record the two channels of a stereo program, like this: In a normal cassette player, there are actually two of these small electromagnets that together are about as wide as one half of the tape's width. This signal is amplified to drive the speakers. This creates a varying magnetic field in the core and therefore a signal in the coil. During playback, the motion of the tape pulls a varying magnetic field across the gap. At the gap, magnetic flux forms a fringe pattern to bridge the gap (shown in red), and this flux is what magnetizes the oxide on the tape. During recording, the audio signal is sent through the coil of wire to create a magnetic field in the core. The electromagnet consists of an iron core wrapped with wire, as shown in the figure. This electromagnet is tiny - perhaps the size of a flattened pea. In a 90-minute cassette, the tape is 443 feet (135 meters) long. There is also a small felt pad that acts as a backstop for the record/playback head in the tape player. There are two spools and the long piece of tape, two rollers and two halves of a plastic outer shell with various holes and cutouts to hook the cassette into the drive. If you look inside a compact cassette, you will find that it is a fairly simple device. The cassette was patented in 1964 and eventually beat out 8-track tapes and reel-to-reel to become the dominant tape format in the audio industry. Reel-to-reel tapes were common until the compact cassette or "cassette tape" took hold of the market.See this page for a picture of an early reel-to-reel recorder. Tapes originally appeared in a reel-to-reel format.
German engineers perfected the first tape recorders using oxide tapes in the 1930s.The wire recorder was invented in 1900 by Valdemar Poulsen. The original format was not tape at all, but actually was a thin steel wire.
0 kommentar(er)
