Figure 1-2. Simplified
Figure 1-3. Direct recording
sketch of flux lines in
process
a recording gap
3.
The playback is accomplished by relative motion between the tape and a playback head similar
or identical to the record head. As the magnetic pattern across the gap varies, the flux lines from the
tape enter the core and induce a signal voltage in the coil, which depends on the number of turns in the
coil and the rate of change of magnetic flux (fig 1-4). In turn, the rate of change increases directly with
the increase of frequency. If the tape speed is constant and the effects of head resonance and width are
neglected, the induced voltage rises with frequency at a rate of 6db per octave.
3
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