JP3180441B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus capable of recording or recording / reproducing a video signal.

[0002]

2. Description of the Related Art In recent magnetic recording / reproducing apparatuses, reduction of man-hours for adjustment has been regarded as important as one means for increasing cost.

The adjustment of the recording current and the recording current frequency characteristic of the magnetic recording / reproducing apparatus is one of the time-consuming adjustments because it is impossible to judge whether the set value is appropriate unless recording / reproducing is performed. Conventional examples of these adjustments that require recording and reproduction will be described with reference to FIGS. 2, 3, and 4. FIG.

As shown in FIG. 3, a video signal 9 output from a video signal source 2 is converted into a recording signal 23 by a signal processing circuit 4 together with an audio signal 15 output from an audio signal source 3.
The image is recorded on the recording medium 14 by the recording head 13. The amplitude (recording current) and frequency characteristics (recording current frequency characteristics) of the recording signal 23 can be adjusted by the signal processing circuit 4 using the adjustment signal 11 output from the adjusting unit 5.
The superimpose signal generation circuit 6 is a circuit that converts the adjustment value 11 into the superimpose signal 1 and is synchronized with the video signal 9 by the synchronization signal 10. The video signal 9 is mixed with the superimposed signal 1 in a superimposed signal adding circuit 8 to become a superimposed video signal 12, which is displayed on a monitor (television) 16 via a video signal selection switch 21, and And the adjustment value 11 can be confirmed in the video. A signal recorded by the recording head 13 can be displayed on the monitor 16 as a simultaneous reproduction signal 20 via the video signal selection switch 21 immediately after recording by the reproduction head 18 and the reproduction signal processing circuit 17. . When the simultaneous reproduction function is provided, the simultaneous reproduction signal 20 is monitored by the monitor 16 and other measuring instruments 22 to determine whether the adjustment value 11 is appropriate.
You can make adjustments while checking instantly using.

However, when the reproducing function is omitted from the example of FIG. 3, that is, in the case of the magnetic recording apparatus of FIG. 4 which does not have a function of reproducing and confirming a video signal, the adjustment value 11 is set to an arbitrary value. Post-recording is performed, rewinding / reproducing is performed by a magnetic recording / reproducing apparatus (FIG. 2) having a reproducing function, and an adjustment value 11 is set based on the image displayed on the monitor 16 and the result of measurement by the other measuring instrument 19. The adjustment, setting, recording, rewinding, reproduction, and determination of the adjustment value 11 are repeatedly performed until the determination is appropriate.

[0006]

As described above, in a magnetic recording / reproducing apparatus having no function of outputting a reproduced video signal, whether or not the setting of the adjustment value 11 is appropriate is determined when reproducing with a magnetic recording / reproducing apparatus having a reproducing function. Otherwise, it cannot be determined, so adjustment, recording, rewinding, and reproduction must be repeated many times before finding the optimum point, which is very time-consuming.

An object of the present invention is to provide a magnetic recording / reproducing apparatus which can easily adjust even if there is no function of outputting a reproduced video signal.

[0008]

In order to solve the above-mentioned problems, according to the present invention, there is provided means for converting an adjustment value into a superimposed signal, and selecting a video signal to which the superimposed signal is added or a video signal not to be added. Means to do,
The video signal after the video signal selecting means can be recorded.

[0009]

According to the above-mentioned means, a function of outputting a reproduced video signal can be provided if the adjustment value is recorded while changing the adjustment value when the video signal superimposed on the video signal is selected by the recording video signal selection means. By displaying the playback video signal on a TV monitor when playing back with a certain magnetic recording and playback device, and connecting the playback signal to a measuring instrument as necessary,
Since the change of the adjustment value and the corresponding playback video and playback signal can be observed at the same time, it is easy to specify the optimum value of the adjustment value, and the setting, recording, rewinding, and playback of the adjustment value can be repeated many times. It can be adjusted without any adjustment.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a magnetic recording apparatus according to one embodiment of the present invention. In FIG. 1, those having the same numbers as those in FIGS. 3 and 4 have the same or equivalent functions, and a detailed description thereof will be omitted.

In FIG. 1, a video signal input to the signal processing circuit 4 is such that a video signal 9 or a superimposed video signal 12 can be selected by a recording video signal selection switch 7. The selected signal is recorded on the magnetic recording medium 14 by the recording head 13 via the signal processing circuit 4.

As described above, according to this embodiment, the superimposed video signal 12 displaying the adjustment value 11 can be recorded by adding the recording video signal selection switch 7. For this reason, if the adjustment value 11 is changed from the lower limit to the upper limit during one recording, when the reproduction is performed by the magnetic recording / reproducing apparatus with the reproduced video output (FIG. 2), the adjustment value 11 is changed during the single reproduction. All values and the corresponding video or signal can be observed at the same time, and the optimum value of the adjustment value 11 can be easily specified.

When it is not necessary to record the adjustment value, the video signal 9 may be selected by the recording video signal selection switch 7.

[0015]

According to the present invention as described above, according to the present invention, control since a video signal to display the Seichi can be recorded, even if the ability to check the video signal with simultaneous playback function or reproduction is not, playback The optimum adjustment value can be easily specified at the time of reproduction by the device, and the recording current adjustment and recording current
If you do not perform recording and playback, as in the adjustment of wave number characteristics
It is possible to provide a magnetic recording / reproducing apparatus in which the adjustment that cannot specify the optimum adjustment value can be performed simply and efficiently. Also, by adding a recording video signal selection switch,
When it is not necessary to record an
An image signal can be selected and recorded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a block diagram of a reproducing system of a magnetic recording / reproducing apparatus with a reproduced video output.

FIG. 3 is a block diagram of a conventional magnetic recording / reproducing apparatus with a simultaneous reproducing function.

FIG. 4 is a block diagram of a conventional magnetic recording / reproducing apparatus without a reproducing function.

[Description of Signs] 6 Superimpose signal generation circuit 7 Recording video signal selection switch 8 Superimpose signal addition circuit

Claims (2)

(57) [Claims] Means for converting 1. A adjustment value superimpose signal, and means for adding the superimposed signal to the video signal, based on a video signal obtained by adding the superimposed signal to the adjustment value Recording current or recording
Recording on magnetic media while changing recording current frequency characteristics
A magnetic recording / reproducing apparatus including a recording unit. 2. The video signal recorded by the recording means is superimposed.
Hand to select whether to add or not to add an impose signal
The magnetic recording / reproducing apparatus according to claim 1, further comprising a step.