Dynamic magnetic information storage or retrieval – Recording or reproducing an information signal and a control... – Reference carrier to control demodulator
Patent
1977-07-01
1979-01-23
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Recording or reproducing an information signal and a control...
Reference carrier to control demodulator
G11B 502
Patent
active
041363647
ABSTRACT:
An improved method and apparatus for reducing wow and flutter associated with recording devices are disclosed. Two input signals containing useful information and a constant reference signal are recorded and reproduced by a three channel recording and reproducing system. The reproduced signals contain, in addition to the recorded signals, frequency deviations caused by wow and flutter of the recording and reproducing system. Reproduced signals are converted to frequency-dependent voltages and the constant reference signal is subtracted from the reproduced reference voltage to provide a reference error voltage. The reference error voltge is transmitted to a multi-state control circuit in which the reference error voltage cancels the error voltage components of the two reproduced information frequency-dependent voltages leaving only the frequency-dependent information input signal voltages which are then transformed into frequency signals substantially equal to the recorded information signals.
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Beery John C.
Huston Harvey L.
Canney Vincent P.
Signature Systems, Inc.
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