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tape bias
Tape bias is the term for two phenomena, AC bias and DC bias, that improve the fidelity of analogue magnetic tape sound recordings. DC bias is the addition of a direct current to the audio signal that is being recorded. AC bias is the addition of an inaudible high-frequency signal (generally from 40 to 150 kHz) to the audio signal. Magnetic tape has a nonlinear response at low signal strengths, as measured by its coercivity. Bias increases the signal quality of most audio recordings significantly by pushing the signal into the linear zone of the tape's transfer function.
== History ==
Magnetic recording was proposed as early as 1888 by Oberlin Smith, who published 1888-09-08 in ''The Electrical World'' as ''"Some possible forms of phonograph"''. By 1898 Valdemar Poulsen had demonstrated a magnetic recorder and proposed magnetic tape.〔Poulsen, Valdemar, ''"Method of and apparatus for effecting the storing up of speech or signals by magnetically influencing magnetisable bodies"'', BP 8961, 1898, page 3, row 34.〕 Fritz Pfleumer was granted DE500900 for a ''"Sound recording carrier"'' on 1928-01-31, but it was later overturned in favour of the earlier US1653467 by Joseph A. O'Neill.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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