JPS6348983A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To contrive to complete a reproducing function by outputting a picture immediately before a change stored in a picture memory when a mode change together with a reproduction is carried out in a mode setting circuit as a still picture. CONSTITUTION:On the way of a standard reproduction mode, a mode setting key 17a is operated to rewind a tape travelling mode and change to the reproduction mode. In this case, a picture memory circuit 13 stores the reproduced output of a video reproducing circuit 3 immediately before the change of the mode. Then, according to an instruction from a control circuit 16, a change over switch 14 is changed over to the picture memory circuit 13 side. Thereby, a video stored immediately before the change of the mode by the circuit 13 is outputted through the change over switch 14. At this time, even after a temporary stop, when a sag is generated in a magnetic tape about to shift to a rewinding reproduction mode, the picture reproduced finally of the standard reproduction mode is reproduced as the still picture, a stable picture having no noise is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic recording and reproducing apparatus which reproduces a static IL image of an image facing a mode change when a tape running mode is changed.

[Prior Art] In magnetic recording and reproducing devices such as video tape recorders used for home use, a pair of rotating magnetic heads exchange magnetic tape.
It uses a helical scan method that records or reproduces signals while performing oblique scanning.

In the conventional magnetic recording and reproducing apparatus l shown in FIG. The converted signals are added to each other and supplied to the connected preview receiver 4 as a reproduced video signal.

[Problems to be Solved by the Invention] The above-mentioned conventional magnetic recording/reproducing device 1 may cause tracking disturbances due to mismatch between the tape speed and the rotation timing of the magnetic head during the mode change transition period, or the tape tension may change. If fluctuations are not transiently absorbed for one minute and the magnetic tape becomes slack, there is a problem in that noise appears on the entire screen.

In particular, when switching from standard II playback mode to rewind playback mode or vice versa, an image with a lot of noise appears on the screen of the television receiver 5. However, there were problems such as making viewers feel uncomfortable.

[Means for Solving the Problems] The present invention solves the above problems, and includes: an image memory circuit that stores reproduction signals reproduced by a magnetic head;
a mode setting circuit that sets the running mode of the magnetic tape;
When the mode is changed between modes involving playback by this mode setting circuit, the image immediately after the mode change +iij is stored in the image memory circuit, and the image stored by the image memory circuit in the transition J17J leading to the changed mode is stored in the image memory circuit. The present invention is characterized in that it is configured by providing a control circuit for controlling the image to be output as a still image.

[Function] This invention allows an image memory circuit that stores playback signals from a magnetic head to store an image immediately before the mode change when a mode change is made between modes involving playback, and leads to the changed mode. By outputting the image stored in the image memory circuit as a still+h image during the transition period, it is possible to prevent the image from being transiently disturbed before and after the mode change.

[Example] Hereinafter, an example of the present invention will be described with reference to FIG. 1.2. FIG. 1 is a circuit diagram showing an embodiment of the magnetic recording/playback apparatus of the present invention, and FIG. 2 is a flowchart for explaining the operation of the control circuit shown in FIG. 1. .

In FIG. 1, the magnetic recording and reproducing device II has a signal line 12 and an image memory circuit 13 connected in parallel to the output side of a video reproducing circuit 3, and one of them is selectively reproduced via a changeover switch 14. It is configured to be connected to the video output terminal 15. +6 is a control circuit which, when the mode is changed by the mode setting key 16a in the mode setting circuit 17, changes the running path of the tape drive unit h18 such as a capstan motor or drum motor or the magnetic tape. A unique moving part drive mechanism! 9 and the like, while supplying commands corresponding to the mode change transition period to the image memory circuit 13 and the changeover switch I4.

Now, suppose that the mode setting key 17a is operated to change the tape running mode to the rewinding playback mode during playback in a so-called standard playback mode in which the magnetic tape is played back while running at a normal tape speed. In this case, in step (+01) shown in FIG. 2, the image memory circuit I3 first stores the reproduction output of the video reproduction circuit 3 immediately before the mode change according to a command from the control circuit 16.

Immediately after the storage is completed, as shown in step (102), the changeover switch 14 is switched to the image memory circuit 13 side by a command from the control circuit 16. As a result, the image that the image memory circuit +3 stored just before the mote change is transferred to the changeover switch! 4.

At this time, the mote is mechanically changed, but -↓-1
Even if the magnetic tape that was ready to rewind IIt raw mode after stopping had some slack, the last image played in QilG raw mode would be played back as a still image. Ru. Then, when the winding and playback of the magnetic tape is started and the running state of the magnetic tape becomes stable, 1'JI is cut off at step (+03), and the driving of the magnetic tape by the tape drive device NItI8 becomes stable. After a time interval T required for
6, the changeover switch 14 switches to the video playback circuit 3.
Switch to the side. As a result, a stable rewind playback image free of noise is outputted to the outside via the changeover switch +4. Therefore, there is no image disturbance or noise caused by signal dropout noise or tracking deviation when changing modes, as seen in the conventional magnetic recording/reproducing device 1.

Note that -[- time T is the time T recorded in the magnetic recording/reproducing device 11 [,
The most reliable time is set from the data obtained repeatedly through experiments etc. In addition, the control circuit 16
Not limited to mode change from live to rewind playback, fast forward 1
Various data corresponding to various mode changes are stored so that similar effects can be obtained when changing the mode from 1F playback to rewind playback or from still image playback to droplet + IF playback.

In this way, when the image memory circuit 13 that stores reproduction signals from the magnetic heads 2a and 2b is changed between modes involving reproduction, the magnetic recording recording device 11 is configured to face a mode change when the mode is changed between modes involving reproduction. Since the image memory circuit 13 is configured to memorize the image of , and control the image memory circuit 13 to output the stored image as a still image during the transition period leading to the changed mode, the image memory circuit has a storage capacity sufficient to store the still image. 13 and the control circuit 16 operates the image memory circuit 13 before and after changing the mode, it is possible to prevent the inconvenience of transient image disturbance. Applying
I11 life functions can be further enhanced.

[Advantageous Effects of the Invention 1] As explained above, the present invention allows an image memory circuit that stores playback signals from a magnetic head to store an image of the face of the mode change when a mode change is made between modes involving playback. The configuration is such that the image stored in the image memory circuit is output as a still image during the transition period leading to the mode after the change.An image memory circuit with a storage capacity capable of storing still images is prepared, and the image memory circuit is By operating the image memory circuit back and forth, it is possible to prevent the inconvenience of transient image disturbances, and this allows the application of image memory technology, which has been attracting attention recently, to further enhance playback functions. It has excellent effects such as

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of the magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a flowchart for explaining the operation program of the control circuit shown in FIG. 1, and FIG. FIG. 1 is a circuit configuration diagram showing an example of a conventional magnetic recording/reproducing device. 2a, 2b, , magnetic head, +1. ,,magnetic recording amphibian device, +3. ,,image memory circuit,! 61, control circuit,
17. ,,mode setting circuit.

Claims (1)

[Claims] There is an image memory circuit that stores the reproduction signal reproduced by the magnetic head, a mode setting circuit that sets the running mode of the magnetic tape, and when the mode is changed between modes involving reproduction by this mode setting circuit, the mode is set. A magnetic recording and reproducing device comprising: a control circuit that controls the image memory circuit to store an image immediately before the change, and output the image stored by the image memory circuit as a still image during a transition period leading to the mode after the change.