Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1985-06-24
1987-01-06
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 744, 360 75, G11B 554, G11B 1522, G11B 2732
Patent
active
046351442
DESCRIPTION:
BRIEF SUMMARY
1. TECHNICAL FIELD
The present invention relates to a tape running control apparatus for an audio tape recorder in which a tape in transported and a time code signal recorded thereon is reproduced to thereby search a desired tape stop position and then at such position the tape should be stopped.
2. BACKGROUND ART
Some audio tape recorders have a so-called cue-up function in which a cue signal is recorded on the tape on which an audio signal is recorded and is detected so as to stop the tape at the position of this cue signal, or a cue point. Generally, when the tape runs from a desired running position to the cue point position, if the present tape position is distant from the cue point position, in order to search the cue point position as soon as possible, the tape has to run at high speed in fast forward or rewind mode. However, if the tape continues to contact with the head in a high speed running mode, the tape is given an undesired abrasion, so there have been proposed various methods for protecting the tape from such undesired abrasion.
As the first method, there is recorded on the tape a control pulse signal (CTL signal) which changes its logic level at every predetermined tape length, this control pulse is being reproduced by a fixed head at all times, the number of the pulses produced from the fixed head is counted by a counter to thereby detect the transported amount of the tape when it runs at high speed and the counter content is watched, whereby to know that the tape running position approaches the cue point position.
As the second method, in addition to the control pulse signal, a time code signal is recorded on the tape together with the audio signal, in which when the tape is transported at high speed, the reproducing head contacts with the tape intermittently to thereby in a sampling manner reproduce the time code signal as a reference signal, while when the reproducing head leaves the tape, the tape transported amount between the reference signals is interpolated by the reproduced control pulse signal whereby to know that the tape running position approaches the cue point position.
According to these prior art methods, until the tape running position approaches the cue point position, the count data with respect to the tape transported amount is obtained by utilizing the control pulse signal to thereby calculate the distance between the tape running position and the cue point position. However, the control pulse signal does not absolutely represent each tape position essentially but its accumulated value indicates the tape running amount. Therefore, the prior art methods are to indirectly calculate each tape position by utilizing such accumulated value.
For this reason, the prior art methods are limited inherently in increasing the accuracy with which the tape is stopped at the cue point position. In addition, the detected control pulse signal is inevitably disturbed when the tracing direction on the tape is changed, so this requires a circuit for correcting such disturbed control pulse.
In view of such points, this invention is provided in which when the tape is stopped at the cue point position, the fact that the tape running position approaches the cue point position can be positively judged by using a time code to thereby accurately stop the tape at the cue point position and reduce the wear of a reproducing head as much as possible.
DISCLOSURE OF INVENTION
According to the present invention, in order to achieve such objects, on the basis of a time code reproduced signal obtained from the audio tape recorder, a difference between a time code indicating the present tape position and a data indicating a cue point at which the tape should be stopped can be judged by time code comparing means and the tape running mode of the audio tape recorder is specified by mode control means on the basis of the judged result, and a reproducing head of the audio tape recorder is controlled to contact with or leave the tape by timer control means.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a block
Goto Hideaki
Ninomiya Ichiro
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
Stellar George G.
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