Magnetic tape recorder poonam


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Magnetic tape recorder poonam

  1. 1. G S T Poonam MSc -I
  2. 2. Introduction Magnetic recording is a backbone technology of the electronic age. It is a fundamental way for permanently storing information . A tape recorder, tape deck, reel-to-reel tape deck, cassette deck or tape machine is an audio storage device that records and plays back sound using magnetic tape, either wound on a reel or in a cassette, for storage. It records a fluctuating signal by moving the tape across a tape head that polarizes the magnetic domains in the tape in proportion to the audio signal
  3. 3. Block Diagrams of Tape Recorder
  4. 4. Working The tape head consists of a ring of soft magnetic material, called the core, with a small gap in it. A coil is wound around the core. The tape travels over the gap in the core. During recording, an audio signal causes current to flow through the coil producing a magnetic field in the gap, as shown by the blue lines of force in the diagram. As the audio signal varies in amplitude and frequency so does the magnetic field. The tape consists of a plastic film coated with a material that is magnetized by the field as it passes over the gap. As the magnetic field varies in strength so does the magnetism stored on the tape. During playback the tape passes over the same head. (it is called the record/playback head). This time the magnetism stored on the tape induces a voltage in the head coil. This voltage is amplified and used to drive a loudspeaker.
  5. 5. AdvantagesIt has wide frequency ranges from DC to several MHz.They have a low distortion.The magnitude of the electrical input signal is stored in magnetic memory .The recorded signal is immediately available with no time lost.When the information has been processed, the tape can be erased and reused to record a new set of data.It permits multi-channel recording.
  6. 6. Applications Instrumentation Systems Recording Audio Recording Video Computers Electrocardiograph Flight Test Data Recording and Processing Systems
  7. 7. References:InternetA Course in Electrical and Electronic Measurements and Instrumentation –A.K.Sawhney. Dhanpat Rai &Co
  8. 8.