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Controlling the trace of a rotary head
| Details |
Inventors: Sakamoto, Hitoshi;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Stellar; George G.
Assistant Examiner:
Attorney, Agent or Firm: Eslinger; Lewis H., Sinderbrand; Alvin
The position of a rotary head mounted on a deflection device is controlled as the head scans successive tracks on a record medium. Tracking drive signals are generated as a function of the deviation of the head relative to a track scanned thereby. The tracking drive signal is sampled at successive locations along the trace. Previously stored samples are compared to the successively produced samples, and any difference is used to correct the stored sample by a predetermined amount irrespective of the actual difference. Hence, the stored samples gradually are corrected to represent the configuration of the tracks scanned by the rotary head. When the head reproduces signals from the record medium, the generated tracking drive signals are used to control the deflection device so as to make the head coincident with the track being scanned thereby. When the head is used to record signals, the stored samples are used to control the deflection device before such samples are corrected. For recording the stored samples may be compared to reference samples, and gradually are corrected to conform to the reference samples, and used to control the deflection device so that the traces gradually conform to the configuration represented by the reference samples. |
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DETAILED DESCRIPTION In accordance with this invention, a method and apparatus are provided for controlling the position of a rotary head which is mounted on a deflection device, as the head scans successive tracks on a record medium.
Tracking drive signals are generated as a function of the deviation of the head relative to the track being scanned thereby, such tracking drive signals representing the configuration of a previously recorded track relative to the trace then being scanned by the head.
The generated tracking drive signal is sampled at successive locations along the scanned trace, and such samples are compared to stored samples.
If a difference is detected between a produced sample and a stored sample, the stored sample is corrected by a predetermined amount irrespective of the actual difference therebetween.
Successive samples thus are corrected, and the corrected samples are returned to a storage device.
The stored samples thus are gradually corrected to represent the configuration of the tracks being scanned by the head.
During a reproducing operation, the generated tracking drive signals are used to control the position of the head.
During a recording operation, reference samples, representing the configuration of a reference track, are used to control the position of the head.
The present invention finds ready application during an edit mode, wherein the head is used first to reproduce signals from previously recorded tracks, and then to record new signals.
During the reproducing operation, the head is controlled so as to scan traces which coincide with the previously recorded tracks.
Then, when the operation of the head changes over to record signals, the traces scanned by the head gradually are changed from the configuration of the previously recorded signals to the reference configuration.
Hence, tracking discontinuities at the change-over, or edit point, are avoided.
The present invention also is used to produce the aforementioned reference samples which represent the configuration of tracks to be recorded by the head
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Exercise Devices 
