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Described is a noise reduction system for magnetic storage which reduces external noise that is picked up by the magnetic read head.
English (United States)
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Noise Reduction System for Magnetic Storage
Described is a noise reduction system for magnetic storage which reduces
external noise that is picked up by the magnetic read head.
External noise that is picked up by a magnetic read head causes false data to
be read. An example of this is the magnetic field from a display monitor
interfering with the diskette drive system.
The drawing is a circuit diagram of the noise reduction system disclosed
herein. L1 is the read head which picks up both ambient noise and the signal
from the media. L2 is located in close proximity to L1 but oriented and designed
such that only ambient noise is picked up. The signal from L2 is inverted and
then added to the signal from L1 thereby eliminating noise as shown in the
following equations: LET: NA1 = Ambient noise picked up by L1 NA2 =
Ambient noise picked up by L2 RS = Read signal
Assuming that L1 and L2 have approximately equal gain, then NA1 = NA2.
S1 = Signal developed by L1 = RS + NA1 S2 = Signal developed by L2 = NA2
Total signal for next stage is = S1 - S2 = RS + NA1 - NA2
But NA1 = NA2. Then total signal is equal to RS, and noise is eliminated.
The noise coil L2 can be an inexpensive coil that has about the same gain as