Equalization for Tape PlaybackWhen a magnetic image of a sound signal is recorded onto tape with optimum bias, the magnetization of the tape is linearly proportional to the signal voltage applied to the head. The playback process, depends not only upon the magnetization of the tape which passes under the playback head but also upon its frequency. By Faraday's law: The output signal voltage then increases by a factor of two for each octave rise in frequency f, so an equalization circuit must be employed to reduce the signal back to proper balance. A factor of two in voltage is 6 decibels in power, so the equalization circuit must increase its attenuation 6 dB per octave. |
Index Sound reproduction concepts Tape recording concepts | ||
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Iron and Chromium Comparison
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Index Sound reproduction concepts Tape recording concepts References Rossing Science of Sound Ch 21 | ||
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Phonograph Cartridge
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Index Sound reproduction concepts Audio signal concepts | ||||
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