JPH0246548A - Video magnetic recorder - Google Patents

Abstract

PURPOSE:To simplify an operation by providing a controller for detecting a video synchronizing signal contained in a recording video signal with a video signal processor and stopping a recording operation automatically when the video synchronizing signal is undetectable. CONSTITUTION:The video signal processor 5 is provided with a video synchronizing signal detecting means 112 for detecting the video synchronizing signal in the video signal. When the video synchronizing signal is contained in the video signal to be inputted from a signal line 6, a signal is not outputted from the video synchronizing signal detecting means 11 upon detection of this video synchronizing signal. That is, a normal recording operation is carried out. When the video signal is not inputted during the recording operation, the video synchronizing signal can never be detected by the video synchronizing signal detecting means 11, and if the nondetection lasts a given period of time, the signal is outputted by the means to a signal line 12 to indicate that the video synchronizing signal, i.e. the recording video signal is not inputted. The controller inputted with this signal is operated to control the recording operation to stop. By this method, the need of the monitoring all the time can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video magnetic recording device that records video signals on a magnetic recording medium such as a magnetic tape.

[Conventional technology]

FIG. 3 shows a conventional video magnetic recording device. A cassette tape 1 has a supply reel 2 and a take-up reel 3 built into a cassette tape main body IA, and stores a magnetic tape 4 wound around these.

5 is a signal processing device which inputs the video signal from the signal line 6;
It performs signal processing for recording on the magnetic tape 4 and outputs it. A signal line 7 connects the output terminal of the signal processing device 5 and a magnetic head 8 mounted on, for example, a rotating drum. 9
1 is a recording control command, and 10 is a control device that controls the entire video magnetic recording apparatus. FIG. 4 is a flowchart showing the operation of the control device 10.

Next, the operation will be explained. The user operates a panel button on the device to generate a recording control command 9, and operates the control device 1° in accordance with the recording control command 9. If the recording control command 9 is a recording command, the control device 10
Under the control of , the video signal for recording is inputted from the signal line 6 to the signal processing device 5, where it is signal-processed for recording, and is inputted from the signal processing device 5 to the magnetic head 8 via the signal line 7, and is then run. The information is recorded on the magnetic tape 4 that is attached to the magnetic tape 4. In this state, when a recording control command 9, which is not a recording command, is given to the control device 10 by the user's operation, the magnetic recording operation is stopped. This recording operation can be stopped by either stopping the recording operation while the power is on, turning off the power after stopping, or stopping the recording operation by turning off the power.

Next, the operation of the control device 10 will be explained in more detail. In step S1, the control device 10 inputs the recording control command 9. If the recording control command 9 is input, the process advances to step S2, and it is determined whether or not it is a recording command. If it is a recording command, the recording operation is started in step S3 and the process returns to step S1. If not, the process proceeds to step S1. The recording operation is stopped in S4 and the process returns to step S1.

[Problem to be solved by the invention]

Since the conventional video magnetic recording device is configured as described above, for example, as shown in FIG.
' is connected to the video magnetic recording device 13 having the configuration shown in FIG. 3 through the video signal transmission signal line 12' to make a copy of the magnetic tape, the video magnetic reproducing device 11' finishes playing the magnetic tape. The video magnetic recording device 13
Since the recording operation continues regardless of the reproduction state of the video magnetic reproduction bag W11', the user has to stop the recording operation by operating the panel, which is cumbersome to operate, and requires constant monitoring of the recording operation. This poses problems such as having to do so, which is troublesome for the user.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a video magnetic recording device that automatically stops the recording operation when the video signal for recording is interrupted.

[Means to solve the problem]

In the video magnetic recording device according to the present invention, the video signal processing device detects the video synchronization signal included in the recording video signal, and when the video synchronization signal can no longer be detected, the recording operation is stopped by the control device.

[For production]

In the video magnetic recording device according to the present invention, if the video signal for recording is no longer input, the video signal processing device cannot detect the video synchronization signal, and since recording is no longer necessary at this time, the recording operation is automatically stopped by the control device. .

〔Example〕' Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, the same or equivalent parts as in the prior art are given the same reference numerals 1 to 10 as in FIG. 3, and their explanations will be omitted. Reference numeral 11 denotes a video synchronization signal detection means for detecting a video synchronization signal included in the video signal input to the signal processing device 5, and its output terminal is connected to the input terminal of the control device 10 via a signal line 12. ing. The signal processing device 5 (including the video synchronization signal detection means 11), the magnetic head 8, and the signal lines 6, 7, and 12 constitute a video signal processing device.

Next, the operation will be explained with reference to FIG. If the video signal input from the signal line 6 includes a video synchronization signal,
The video synchronization signal detection means 11 that has detected this does not output a signal. Therefore, a recording operation similar to the conventional one is performed.

If the input of the video signal is interrupted during the recording operation, the video synchronization signal detection means 11 cannot detect the video synchronization signal, and if the video synchronization signal cannot be detected for a predetermined period of time, the video synchronization signal, that is, the video signal for recording is not input to the signal line 12. Outputs a signal indicating that there is no output. The control device 10 inputting this signal controls the recording operation to be stopped.

Next, the detailed operation of the control device 10 will be explained with reference to FIG. In step Sll, it is determined whether or not the recording control command 9 has been input. If so, it is determined in step 312 whether or not it is a recording command. If not, the process advances to step S15. If a recording command is issued in step S12, a recording operation is started in step S13,
Otherwise, the recording operation is stopped in step S14,
After this, the process returns to step Sll.

On the other hand, in step S15, the video synchronization signal detection means 11
It is determined whether or not there is a video synchronization signal based on the presence or absence of a signal from , and if there is, the process returns to step Sll; if not, it waits for a predetermined time in step 316. After a predetermined period of time has elapsed, the process advances to step 317, and it is determined again whether or not there is a video synchronization signal, and if so, the process returns to step S11; otherwise, the process returns to step S
The process advances to step 14 and the recording operation is stopped.

Note that the reason for waiting for a predetermined period of time in step 316 is to prevent malfunctions when the video synchronization signal is temporarily interrupted within the predetermined period of time due to poor contact between the signal line and the terminal, etc., and is then input again. It's for a reason.

Further, in the above embodiment, the recording operation is stopped, but if the video synchronization signal detecting means detects the video synchronization signal while the recording operation is stopped, the recording operation may be automatically started under the control of the control device. The same effects as in the above embodiment are achieved. In this case, steps 315 and S17 in FIG.
YES and NO may be exchanged, respectively, and the process may proceed to step 313 from YES at step S17 after the exchange.

〔Effect of the invention〕

As described above, according to the present invention, since the recording operation is automatically stopped when the video synchronization signal cannot be detected, the user's operation is simplified and not complicated, and the control device A microcomputer is often used for this purpose, and by simply installing a video synchronization signal detection program, it can also be used as a video synchronization signal detection means.The device itself can be realized at the same price as conventional products, and the advantage is that it does not increase costs. There is.

[Brief explanation of the drawing]

FIG. 1 is a simplified configuration diagram of an apparatus showing an embodiment of the present invention;
Figure 2 is a flow diagram showing the control operation of the control device;
FIG. 3 is a simplified configuration diagram of the conventional apparatus, FIG. 4 is a flow diagram showing the control operation of the conventional control device, and FIG. 5 is a diagram showing connection relationships during tape copying. In the figure, 1... cassette tape, 2... supply reel,
3... Winding reel, 4... Magnetic tape, 5... Signal processing device, 6, 7.12... Signal line, 8... Magnetic head, 9... Recording control command, 10 . . . Control device, 11 . . . Video synchronization signal detection means. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a video magnetic recording device comprising a video signal processing device for recording video signals on a magnetic recording medium and a control device for controlling start and stop of recording operation, the video signal processing device is configured to record video signals on a magnetic recording medium. The video recording apparatus includes a video synchronization signal detection means for detecting a video synchronization signal, and the control device performs control to stop the recording operation when the video synchronization signal detection means no longer detects the video synchronization signal. Magnetic recording device.