Digital tape recording devices are also used to store programs and data for a computer. Both eliminate tape hiss and reproduce sound more accurately than analog recorders. Digital audio tape (DAT) and digital compact cassette (DCC) recorders transform the audio signals into digital pulses, which are then stored on the tape. Tape hiss, sound composed of high frequencies picked up at random during recording, is suppressed by several systems, among them Dolby, Dolby-B, Dolby-C, and dbx. The current is then amplified and used to reproduce sound through a loudspeaker. During playback the tape passes over the playback head (often the same one used for recording) and the tape's magnetic field induces a current in the transducer. Tape recorders always require that the recording media and the recording or playback tape heads move with respect to each other. The current is fed to a transducer in the recording head of the tape recorder, which converts it into corresponding magnetic flux variations that magnetize the particles on the tape. In audio recorders, the sound to be recorded is picked up by a device such as a microphone, and transformed into an electric current. The first tape recorders were used to store audio information. Tape recorders can store many different forms of information. The coating is normally held on the tape with a special binder. The tape is coated with fine particles of a magnetic substance, usually an oxide of iron, cobalt, or chromium. Tape recorder, device for recording and replaying of sound, video, and digital information on plastic (usually polyester) or paper tape.
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