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A design is disclosed which enables the systematic cancellation of signal feedthrough in multiple track read/write heads, such as those utilized in magnetic tape recording systems.
English (United States)
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Circuit Feedthrough Cancellation in Read/ Write Head
A design is disclosed which enables the systematic cancellation of signal
feedthrough in multiple track read/write heads, such as those utilized in magnetic
tape recording systems.
A functional block diagram for the system is illustrated in Fig. 1. In this figure,
multiple signals from the write head tracks are summed at a point 10. The
summed signals are directed to an attenuation block 12 and following that to a
time delay block 14. The output of the time delay block serves as an input to a
summation point 16. The raw feedthrough signal is received at the summation
point from an inductor 18 which is recognized as representing a signal
proportional to the summed write head voltage. The cancelled signal output is
provided at an output 20.
The system is designed around the principle that the magnitude of raw
feedthrough signal from the read head is essentially linearly proportional to that
of the summed write head voltages. This assumes that the write head is
operated at a frequency range such that the read head voltage can be
characterized as purely inductive. This observation has been confirmed in the
The time delay associated with the feedthrough process in Fig. 1
accommodates, in essence, for the magnetic coupling that exists through the air
between the read and write heads.
Thus, the design of the system depends on measuring the required amount
of attenuation for a given type of head, and then measur...