| Tape Bias |
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Early tape recorders simply applied the unadulterated input signal to the record head, resulting in mediocre recordings with poor low-frequency response. In 1940 , J. Von Braunmühl and Dr. W. Weber accidentally discovered that the addition of a high-frequency tone kept the recorded signal in the linear response zone, resulting in a striking quality improvement. Different levels of bias are needed for different types of tape, so most recorders offer a bias setting switch on the front panel, or, in the case of the Compact Audio Cassette , may switch automatically according to cutouts on the cassette shell. EXTERNAL LINKS |
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