AUTOMATICALLY COMPENSATED MOVABLE HEAD SERVO CIRCUIT

In recording and reproducing apparatus of the type which utilizes transverse positioning of the transducing head assembly to accurately follow a track during reproducing and, at the completion of the track, to position the head to either play the next adjacent successive track, replay the same track...

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Bibliographic Details
Main Author RAYMOND F. RAVIZZA
Format Patent
LanguageEnglish
Published 23.01.1987
Edition3
Subjects
CONTROLLING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
REGULATING
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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Summary:In recording and reproducing apparatus of the type which utilizes transverse positioning of the transducing head assembly to accurately follow a track during reproducing and, at the completion of the track, to position the head to either play the next adjacent successive track, replay the same track or play another track so that the appropriate special motion effect is achieved, tracking is maintained by applying a small oscillatory motion to the head to cause it to vibrate laterally of the track, examining the resulting modulation of the reproduced signal's envelope to generate a tracking error correction signal and applying this to the head assembly. A reference signal employed in the generation of the error correction signal is automatically phase synchronized in response to the head vibrations to correct errors introduced to the error signal as a result of phase changes introduced to the modulation of the reproduced signal's envelope by effects other than mistracking by the head. The speed of a tape capstan is retroactively controlled.
Bibliography:Application Number: HK19870000068