JPS63253778A - Screen switching device - Google Patents

Abstract

PURPOSE:To view a picture of external input signals while watching the television picture when a video tape recorder is not in a reproducing state by providing a means to switch selectively a content to display onto a master screen and a slave screen among television broadcasting, an external input, and a reproduced picture. CONSTITUTION:A switch capable of switching three circuits by double associative actions for reproduced signals from a control circuit 12, is used for the screen change-over switches 13a, 13b to select video signals to be inputted respectively to a master screen processing circuit 11 and a slave screen processing circuit 10. Said switches 13a, 13b are located in lower positions, and a reproduced picture is displayed in the master screen while a TV reception picture or external input signals depending on an input change-over switch 8 is displayed in the slave screen. When the video tape recorder is not reproducing, in the middle position, a TV reception picture is displayed in the master screen and an external input signal picture is in the slave screen. When the switches 13a, 13b are in the upper positions, an external input picture is displayed in the master screen while a TV reception picture is displayed in the slave screen.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an image processing circuit capable of displaying a plurality of programs on one screen of a television, and particularly to a screen switching circuit suitable for a video tape recorder. Regarding equipment.

[Conventional technology]

A conventional device will be explained with reference to FIG.

From the TV broadcast waves received by the antenna 1, the output video signal of the tuner 2 which receives the target broadcast, the signal selected by the input selector switch 8 which selects the video signal input from the outside, and the signal from the magnetic tape 4. In order to select between the reproduced signal by the reproducing head 5 and the signal amplified by the amplifier 6, a control circuit 12 that controls the magnetic recording and reproducing device displays the selected signal on the TV screen using the screen changeover switch 7, which is linked depending on whether or not reproduction is to be performed. The signal is input to the main screen processing circuit 11 of the first screen (hereinafter referred to as the "main screen") that processes the signal for outputting the signal, and the input selector switch 8 is used to switch the input to the second screen, which is a reduced size of the first screen. (hereinafter referred to as "r child screen") is connected to a child screen selection switch 9 that selects whether or not to display the child screen, and is further connected to a child screen processing circuit 10. It is connected to the output of circuit 11.

According to this, by turning on the sub-screen selection switch 9 while outputting a signal generated by playing back the magnetic tape 4 to the main screen,
Depending on the input selector switch 8, television broadcasts or externally input signals could be viewed on a sub-screen.

[Problem that the invention seeks to solve]

However, the above conventional technology does not take into consideration the child screen when the magnetic tape is not being played back, and even if a child screen is displayed when the magnetic tape is not being played back, the same child screen as the main screen will only appear. However, there was a problem in that it was not possible to display different screens, that is, the TV reception image and the external input image.

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned problems and provides a screen switching device that displays a television reception image and an external input signal screen on a main screen and a sub screen, respectively, when a magnetic tape is not being reproduced.

[Means for solving problems]

The above object is achieved by providing means for selectively switching the contents displayed on the main screen and the sub-screen among television broadcasting, external input, and reproduced images.

[Effect]

The switching position of the changeover switch changes in conjunction with a playback output signal from a control device that controls the video tape recorder.

As a result, during playback, the playback image and the TV reception image, or
When the external input signal screen is not played back, the television reception image and the external input signal screen are selected and displayed on the main screen and sub screen.

〔Example〕

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

The same reference numerals in FIG. 1 and FIG. 2 indicate the same or equivalent items.

The difference between FIG. 2 and FIG. 1 is that the screen changeover switches 13a and 13b, which select the video signals to be input to the main screen processing circuit 11 and the child screen processing circuit 10, are against the signal.

When the video tape recorder is playing, the screen changeover switches 13a and 13b are in the positions shown in the figure, with the main screen showing the playback image and the subscreen showing the input. Depending on the changeover switch 8,
Screen changeover switch 13 when the TV reception picture or external input signal is displayed and the video tape recorder is not playing.
For the positions of a and 13b, two positions other than those shown can be selected.
At the center position, the main screen shows the TV reception image, the sub screen shows the external input signal screen, and the screen changeover switch 13a,
When 13b is in the upper position, external input images and
You can display the TV reception image on the sub screen.

〔Effect of the invention〕

According to the present invention, even if the main screen and sub screen are displayed when the video tape recorder is not in the playback state, the external input signal surface can be viewed while viewing the television screen rather than the same screen. For example, if you connect a TV equipped with an external input/output terminal with an external input terminal, you can simultaneously watch the TV broadcast image received by the tuner built into the video tape recorder and the TV broadcast image received by the TV. There is an effect called.

[Brief explanation of the drawing]

Figure 1 is a block diagram explaining the operation of a conventional device;
The figure is a block diagram showing one embodiment of the present invention. 2-...Tuner, 3...External input terminal, 6...Amplifier. 7... Screen selection switch, 8... Input selection switch. 9...Small screen selection switch, 10...Small screen processing circuit. 11... Main screen processing circuit, 12... Control circuit, 13
a. 13b...Screen changeover switch No. I, No. 2!

Claims (1)

[Claims] a first screen that outputs a video signal to a television screen; means that can output a second screen that is a reduced size of the first screen on the first screen; and means that receives television broadcasts; A means for reproducing a magnetic tape, and a means for reproducing a magnetic tape;
In a magnetic recording and reproducing device equipped with a means for outputting a television received image and a reproduced image, the second screen displays a means for inputting a video signal from the outside, and when the magnetic recording and reproducing device is not reproducing, the television received image is displayed on a second screen. and a screen switching device comprising means for automatically switching a video signal input from the outside so as to output it to a first screen and a second screen.