Loop-back test circuit for magnetic recording systems.

摘要

In a magnetic recording system, a loop-back test circuit is provided to test certain signals written to a recording head for comparison with a corresponding read signal. Initially, a test signal, which is a current sent by a write circuit to a read-write head, is sensed through the voltage generated at the head by the test current, such that a small voltage portion of the test signal is transferred through a resistor to a read circuit. The voltage portion is then filtered through a capacitor to form detectable peaks such that the read signal is generated with pulses corresponding to the peaks.