Tape bias
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Tape bias is the term for two techniques, AC bias and DC bias, that improve the fidelity of analogue tape recorders. DC bias is the addition of direct current to the audio signal that is being recorde
Visualization of the magnetic field on a stereo cassette containing a 1 kHz audio tone. Individual high-frequency magnetic domains are visible.
Magnetophon
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Magnetophon was the brand or model name of the pioneering reel-to-reel tape recorder developed by engineers of the German electronics company AEG in the 1930s, based on the magnetic tape invention by
Tape bias
…noise provided by AC bias was accidentally rediscovered in 1940 by Walter Weber while working at the Reichs-Rundfunk-Gesellschaft (RRG) when a DC-biased Magnetophon that he had been working on developed an 'unwanted' oscillation in its record circuitry. The last production DC biased Magnetophon machines had harmonic…
Tonschreiber from a German radio station in World War II.