JPH0229084A - Video device with superimposing function - Google Patents

Abstract

PURPOSE:To prevent mixing of a superimposing signal onto a dubbed video signal by providing a means inhibiting the mixture of the superimposing signal onto an output video signal at dubbing. CONSTITUTION:A superimposing inhibition switch 7 is inserted between an ON terminal of a superimposing command switch 1 and a superimposing circuit 2, switched to an OFF terminal at dubbing, to ON terminal other than the dubbing in interlocking with the dubbing command switch 6. The dubbing command switch 6 is closed to the position of ON and the superimposing inhibition switch 7 is opened to the position of OFF and even if the superimpose switch 1 is closed to the position of ON terminal, a video signal not mixed with the superimpose signal is outputted from an output terminal 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device (hereinafter referred to as rVTRJ) having a superimpose function and a video device such as a television receiver.

[Conventional technology] The case of a VTR will be explained below as an example.

Some VTRs with a superimpose function can output two video output systems: a video signal for monitoring mixed with a superimposed signal, and a video signal for dubbing that is not mixed with a superimposed signal, and one system. There are some devices that can only extract video signals.

With the former VTR, when dubbing a reproduced video signal, even if a superimposed signal is displayed on the monitor video, it is possible to dub a video signal on which no superimpose signal is superimposed, but with the latter VTR, the monitor video When a superimposed image is displayed on a video signal, a video signal in which this superimposed image is mixed is output.

Figure 2 is a block circuit diagram of the superimpose circuit system and dubbing circuit system of the latter VTR, in which (1) is the switch for inputting the superimpose command signal, and (2) is the ON/OFF switch for this switch (1). (3) is a video signal reproducing circuit, (4) is a mixing circuit, and (5) is a video signal output terminal.

Next, the operation will be explained.

When the switch (1) is turned on, the superimpose circuit (2) operates and outputs a superimpose signal to the mixing circuit (4). Mixing circuit (0 is video signal reproducing circuit (
A superimpose signal is time-divisionally inserted into the video signal input from 3) and sent to the output terminal (5). The video signal output from the output terminal (5) is input to a monitor and a dubbing VTR (not shown).

[Problems to be Solved by the Invention] In a conventional VTR equipped with a superimpose function and having a single video signal output system, if the superimpose command switch is turned on by mistake during dubbing, the video signal to be dubbed will be However, there is also the disadvantage that it is inevitable that the video signal will be a mixture of superimposed signals.

This invention was made with the aim of solving these problems, and even if the superimpose command switch is accidentally turned on during dubbing, it is possible to dub a video signal that is not mixed with a superimposed signal. The purpose is to obtain equipment.

[Means for Solving the Problems] When a dubbing operation is commanded, the video device according to the present invention stops the operation of the superimpose circuit in conjunction with this command, or stops the operation of the superimpose circuit to transmit data from the superimpose circuit. The present invention is characterized in that it includes a superimpose signal mixing inhibiting means for preventing the superimposed signal from being mixed with the video signal.

[Operation] The superimpose signal mixing inhibiting means operates when a dubbing operation is commanded to stop the operation of the superimpose circuit or prevent the superimpose signal from being mixed with the video signal. Therefore, even if the superimpose switch is accidentally turned on during dubbing, the superimpose signal will not be mixed into the video signal.

[Embodiment of the Invention] FIG. 1 is a block circuit diagram of an embodiment of the present invention, and the same reference numerals as in FIG. 2 indicate the same components.

In the figure, (8) is a dubbing command switch, and (7) is a superimpose prohibition switch that constitutes the first stage of superimpose signal mixing. It is inserted between the impose circuit (2) and is OF during dubbing operation.
to the F terminal, and to the ON terminal when dubbing operation is not 11ν,
It is switched in conjunction with the dubbing command switch (6).

Next, the operation will be explained.

At times other than dubbing operation, the superimpose prohibition switch (7) is closed to the ON terminal side, and when the superimpose switch (+) is closed to the ON terminal, the superimpose command signal is output. The signal is input to a superimpose circuit (2), and a superimposed signal is output and mixed with a video signal.

During dubbing operation, the dubbing command switch (6) is set to O.
Closed to the N side, the superimpose prohibition switch (7
) is opened to the OFF side, so the superimpose switch (1) is ON! Even if the child side is closed, the superimpose command signal is not input to the superimpose circuit (2), so the superimpose signal is not output, and the superimpose signal is mixed from the output terminal (5). An incorrect video signal is output.

Therefore, even if the superimpose switch (1) is erroneously closed to the ON terminal side during a dubbing operation, the video signal to be dubbed will be a video signal without superimposition.

In the above embodiment, the superimpose prohibition switch (7) is inserted between the superimpose switch (1) and the superimpose circuit (2), and the superimpose command signal is output as an open circuit during the dubbing operation. Although the configuration is such that the input is not inputted, the configuration is not limited to this configuration. For example, a means for opening or shorting the output side of the superimposing circuit (2) may be used, and furthermore, a means for opening or shorting the output side of the superimposing circuit (4) may be used. It may also be a means for stopping the pause signal mixing operation.

[Effects of the Invention] As described above, the present invention provides a video device configured to send out one system of video signals having a superimpose function, in which a superimpose signal is added to an output video signal during a dubbing operation. Even if the superimpose function is activated by mistake during a dubbing operation, the superimpose signal will be prevented from being mixed with the video signal to be dubbed. This has the effect of providing a video device that can prevent such problems.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of an embodiment of the present invention, and FIG. 2 is a block circuit diagram of a conventional video apparatus having a single video signal output system and having a superimpose function. (1)...Superimpose command switch, (2)
... superimpose circuit, (3) ... video signal reproduction circuit, (4) ... mixing circuit, (6) ... dubbing command switch, (7) ... superimpose prohibition switch. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) In a video device that has one video signal output system and is configured to output a superimpose signal mixed with a video signal when a superimpose command is received, a dubbing operation command is 1. A video device having a superimpose function, comprising means for prohibiting a superimpose signal from being mixed into an output video signal when the superimpose signal is received.