JPS63303586A - Data recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the reproduction of a picture, of which the focus is blurred at the time of the reproduction by recording the information of the defocusing of a video camera on a tape together with a video signal. CONSTITUTION:The information of the focus at the time of photographing by the camera 1 is obtained from a sensor 5, and is sent to a defocusing detection device 6. The defocusing detection device 6 controls the focusing mechanism 7 of the video camera 1, and at the same time, it inputs the information of the defocusing to an ID circuit 14 through a defocusing signal processing circuit 18. The ID circuit 14 sends the said information to a PCM circuit 15, and the output of it is recorded on the tape 4 as being accompanied with the video signal by a recording reproducing head 3 through a recording circuit 2. At the time of the reproduction, the recorded information of the defocusing is detected by the ID circuit 17, and the processing circuit 10 of a regenerative video signal is controlled by its output.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recording and reproducing device, and more specifically, a video camera having a focus shift detection device that detects information on focus shift during shooting, and The present invention relates to an improvement of a data recording and reproducing device equipped with a VTR that records and reproduces video signals from a camera.

(Prior Art) A conventional data recording/reproducing device of this type has, for example, a fifth
It consists of the configuration shown in the figure. In Figure 5,
1 is a video camera, 2 is a recording circuit, 3 is a recording/reproducing head, 4 is a magnetic tape, 5 is a sensor, 6 is a focus shift detection device, F is a focus mechanism, 8 is a display monitor, 9 is a playback circuit, 10 is a signal The processing circuit 11 is a monitor. That is, information on the focus shift obtained by the sensor 5 and the focus shift detection device 6 is sent to the focus mechanism 7. This focus mechanism 7, based on the above information,
It works as a so-called autofocus that automatically adjusts the focus. The information is also sent to the display monitor 8,
The photographer looks at the information displayed on the monitor 8,
You can also adjust the focus manually. On the other hand, the photographed video signal passes through the recording circuit 2 to the recording/reproducing head 3.
is recorded on the magnetic tape 4.

(Problems to be solved by the invention) In the conventional data recording/reproducing device shown in FIG.
If the tracking speed of the focus mechanism 7 is too fast, each time the subject shifts due to camera shake, the focus will be on a different part each time, resulting in a screen that is difficult to see. Furthermore, if the tracking speed of the focus mechanism 7 is slow, it may be difficult to focus even if the video camera 1 is moved. Therefore, the tracking speed of the focus mechanism must be set to an appropriate value in the middle, which poses the problem of not being able to adapt to all types of subjects and completely eliminating out-of-focus images. be. The present invention aims to solve these problems.

[Means for solving problems]

A focus shift signal processing device is provided which manually records the detection signal from the focus shift detection device to record focus shift information on a tape along with the video signal at the time of shooting, and the out-of-focus image is recorded during playback on a VTR. A control circuit was provided to control the signal processing circuit of the VTR so as not to display.

[Function] According to the present invention, information on the focus shift of the video camera is recorded on the tape along with the video signal during shooting, and during playback, the information on the focus shift is used to control the video signal processing circuit of the VTR. can be controlled to prevent out-of-focus images from being displayed.

〔Example〕

FIG. 1 shows an embodiment of the invention. That is, FIG. 1 is a block diagram of a data recording and reproducing apparatus that uses an 8 mm format VTR and records information on defocus as PCH ID data.

In FIG. 1, numerals 1 to 11 are the same as those provided in the conventional apparatus shown in FIG. 14 and 17 are ID circuits, 15 and 16 are PCM circuits,
18 is a focus shift signal processing circuit.

That is, in FIG. 1, the sensor 5 is the video camera 1.
This is to obtain focus information when shooting with . The focus information obtained here is sent to the focus shift detection device 6. The focus shift detection device 6 controls the focus mechanism 7 of the video camera 1, and at the same time inputs information on focus shift to the ID circuit 14 through the focus shift signal processing circuit 18.

FIG. 2 shows an example of the configuration of the processing circuit 18.

In FIG. 2, the analog quantity a, which is the information on the focus shift manually inputted from the focus shift detection device 6, is amplified to a predetermined level by the amplifier 21, and then sent to the sampling circuit 22, where it is sent as a switching pulse for the recording video head. In other words, the signal b1 synchronized with 8 b
It becomes the digital signal C of it.

This 8-bit digital signal C is input to the ID circuit 14.

Returning to FIG. 1, further explanation will be provided. The ID circuit 14 containing the focus shift information sends it to the PCM circuit 15.
The video signal is then sent to the tape 4 via the recording circuit 2 from the recording/reproducing head 3 and recorded along with the video signal. and,
ID circuit 1 output through PCM circuit 16 during playback
The signal at 7 is sent to a reproduction video signal processing circuit 1°.

FIG. 3 shows an example of the configuration of the processing circuit 10.

In FIG. 3, the video signal d input from the reproducing circuit
is input to a delay circuit 31 for correcting the delay of the PCM signal with respect to the video signal for signal processing of recording and reproduction, and its output e is input to the field memory circuit 30. Furthermore, writing of the video signal after A/D conversion into the field memory 33 is controlled by a control circuit 35.

FIG. 4 shows an example of the configuration of the control circuit 35.

In FIG. 4, the focus shift information g input to the control circuit 35 is compared by a comparator 41 with a preset threshold value. Here, when the focus shift information g is larger than the threshold value, that is, when the focus shift amount is large, a signal i for inhibiting writing to the field memory 33 is output from the comparator 41.

Returning to FIG. 3, further explanation will be provided. When the amount of focus shift increases, new video signal data is not written to the field memory 33, so the D/A converter 34 repeatedly reads out the image signal that is not out of focus from the last field memory 33. Become. Furthermore, when the amount of focus deviation falls below the threshold value, writing of video signal data to the field memory 33 is started again. As a result, the output f of the video signal can eliminate the out-of-focus image taken by the camera.

As another embodiment of the present invention, the information on the focus shift may be used as control data when dubbing and editing. For example, when the focus shift becomes larger than a certain amount, the deck on the recording side enters a pause state. I'll keep it. Then, the dubbed tape can be made to look like an out-of-focus screen.

〔Effect of the invention〕

As explained above, according to the present invention, information on the focus shift of the video camera is recorded on the tape along with the video signal when shooting with a VTR, so that the information on the focus shift is recorded on the tape during playback. This has the effect of controlling the video signal processing circuit in order to prevent out-of-focus images from being displayed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of the defocus signal processing circuit of FIG. 1,
3 is a block diagram of the signal processing circuit shown in FIG. 1, FIG. 4 is a block diagram of the control circuit shown in FIG. 3, and FIG. 5 is a block diagram showing an example of a conventional technique. 1... Video camera 2... Recording circuit 4...
Magnetic tape 6...Focus shift detection device 7...Focus mechanism 9...Reproduction circuit 10...
・Signal processing circuit 14.17...ID circuit 15.1
6... PCM circuit 18... Focus shift signal processing circuit 35... Control circuit Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Scope of Claims] A data recording and reproducing device equipped with a VTR that records and plays back video signals from a video camera having a focus shift detection device that detects information on focus shift during shooting, wherein a detection signal from the focus shift detection device is provided. and a defocus signal processing device that inputs the information and records information on the defocus on the tape along with the video signal during shooting, and is configured to prevent the out-of-focus image from being displayed when the VTR plays back. 1. A data recording and reproducing device comprising a control circuit for controlling a signal processing circuit of a VTR.