| http://www.w3.org/ns/prov#value | - In FIG. 5, 56 is an amplifier to amplify the weak analog signal received by the magnetic head 4, 57 is an automatic gain adjustment circuit (AGC) to automatically control the gain for the amplified signal, and 58 and 59 are low pass filters to remove the high frequency noise component contained in the output of the differential amplifiers 54 and 55.
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