In recording audio and video signals onto magnetic tape, problems arise with
the large dynamic range required and the characteristics of the
magnetization curve. The system used is illustrated below.
For audio an AC bias is added to the signal so as to make optimum use
of the magnetization curve.
For video, to produce R, G, and B signals 3 signals have to be recorded.
The luminance signal is recorded as a frequency modulated vsb
signal which also acts as an Ac bias. The frequency is deviated by ±0.5MHz
while the spectrum goes from ~1 to ~6MHz.
The color information is recorded as AM signals with a
~562kHz carrier and ±500kHz deviation.
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COPYRIGHT © 1996 Cuthbert Nyack.