JPS6111510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television receiver capable of simultaneously displaying reception screens of two different channels.

This type of television receiver is called a two-screen TV, and is divided into a picture-in-picture system in which a sub-screen of a channel different from the main screen is inserted into a part of the main screen, and a main screen. In addition to the cathode ray tube that forms the main screen, there is also a picture-out picture system that uses a small cathode ray tube and forms a sub screen outside the main screen. In many of these television receivers, the channels on the main screen and the channels on the sub-screen can be exchanged with each other with a single touch. Then, in a television receiver where both screens can be easily replaced,
If a VTR is connected and the video signal of one channel is being recorded, it may become difficult to tell which screen, the main screen or the sub screen, is being recorded by the VTR after replacing the screen many times. Sometimes I put it away. Particularly, such inconveniences are likely to occur when the main screen and sub-screen channels are frequently switched by remote control operation.

The present invention aims to eliminate such inconveniences,
A video recording device such as a VTR is equipped with a display means for displaying whether the main screen or sub-screen video is being recorded, or which screen video is ready to be recorded. be. Therefore, even if the main screen and sub-screen are frequently replaced, it is possible to easily know which screen is being recorded by the video recording device from the display on the display means.

An embodiment of the present invention will be described below with reference to the drawings.
Note that this embodiment relates to a picture-in-picture method in which the image is inserted into predetermined locations on the sub-screen and the main screen.

First, to explain the outline of a two-screen television receiver with reference to Fig. 1, the reception signal of antenna 1 is
Then, the tuner circuit 2 obtains the A channel IF signal, and the tuner circuit 3 obtains the B channel IF signal.
IF signal is obtained. The above A channel IF signal is
The A-channel video signal S _A is obtained by being detected by the video detection circuit 6 via the IF amplifier 4 , and this signal S _A is added to the mixer circuit 8 . The B channel IF signal passes through the IF amplifier 5 and is detected by the video detection circuit 7, thereby obtaining the B channel video signal S _B. This signal S _B
are added to two field memories 9 and 10. Memories 9 and 10 are composed of BBD,
Each has a capacity to write one field of the signal S _B. When reducing the B channel screen to 1/3 and fitting it into the A channel screen, the memories 9 and 10 each have, for example, 64 1
For example, a BBD in which bit cells are connected in series is 88
A device having a so-called SPS structure connected in parallel is used. And 1H of signal S _B for one BBD
1H's worth of signals are written to each of the 88 BBDs every 3H. Note that the number of BBDs is 525/2×1/3≒88.

Also, while writing to a field in the memory 9, the contents written in the field period before the field are read from the memory 10, and when this reading is completed, the contents of the field in the memory 9 are read next. That's what I do. Writing to these memories 9 and 10 is performed using the signal S.
It is necessary to synchronize with the synchronization signal of signal _B , and readout must be synchronized with the synchronization signal of signal S _A. For this purpose, the synchronization separation circuits 11 and 12 extract the signal from the signals S _A and S _B.
The horizontal and vertical synchronizing signals HD _A , VD _A , HD _B , VD _B are extracted and applied to the control circuit 13 . Added to control circuit 13. The control circuit 13 generates write pulses, read pulses, and shift pulses to be applied to the memories 9 and 10 based on each of the synchronization signals described above. The signals read out from the memories 9 and 10 are added to the mixer circuit 8, and the signals S _A
is synthesized into a predetermined portion of In this case, a blanking signal BLK obtained based on HD _A and VD _A is applied from the control circuit 13 to the mixer circuit 8.
Based on this signal BLK, the signal S _B is fitted into a predetermined portion of the signal S _A. This composite signal is applied to the cathode ray tube 15 through the video amplifier 14. In this way, on the screen of the cathode ray tube 15, A
An image in which the B channel image is embedded into a part of the channel image is obtained.

The above operation is performed using a screen replacement switch.
The two movable contacts 17 of SW ₀ are each fixed contact 1
This is a case where it is switched to the 8, 19 side. When the two movable contacts 16 and 17 of switch SW ₀ are switched to the fixed contacts 20 and 21, respectively, the B channel video signal S _B is directly applied to the mixer circuit 8, contrary to the above operation, and the B channel video signal S B is directly applied to the mixer circuit 8. is added to the mixer circuit 8 through writing and reading by the field memories 9 and 10. Therefore, at this time, an image of the A channel embedded in a part of the B channel image is obtained on the screen of the cathode ray tube 15.

A VTR 22 for recording video signals received by the television receiver is connected, for example, to the output end of the video detection circuit 7. Therefore this
When the power switch SW ₁ of VTR22 is closed, this VTR
22 is activated, the B channel video signal S _B
will be magnetically recorded. In other words, this VTR
The B channel signal is always recorded regardless of the switching of the changeover switch SW ₀ of No. 22 and the switching of the channels of the main screen and sub-screen due to this switching.

Next, regarding the display means for displaying which channel the signal recorded by this VTR 22 is, this television receiver has a marker signal generation circuit 23 for the sub-screen and a marker signal generation circuit 23 for the main screen. The signal generation circuit 24 is also provided. The marker generation circuit 23 for the sub-screen is configured to operate in synchronization with the readout pulse issued by the control circuit 13 for reading out the memories 9 and 10, thereby causing the marker to move to a predetermined position on the sub-screen. It is designed to be formed in position. Marker signal generation circuit 2
The output signal of No. 3 is supplied to the mixer circuit 8 via an AND gate 25 and an OR gate 26 controlled by a switch SW ₅ .
Note that the output of the AND gate 25 is grounded when the switch SW ₃ is closed, and is not supplied to the OR gate 26.

The marker signal generation circuit 24 for the main screen is configured to operate based on the horizontal synchronization signal HD _A and the vertical synchronization signal VD _A obtained from the synchronization separation circuit 12.
This allows the marker to be formed at a predetermined position on the main screen. The output of the marker signal generation circuit 24 is connected to an AND gate 27 and an OR gate 28 controlled by a switch _SW4 .
The signal is supplied to the mixer circuit 8 via the . Note that the output of the AND gate 27 is a switch.
It is designed to be grounded when SW ₂ is closed.

The above switch SW ₂ and switch SW ₃ are VTR
It is linked with power switch SW ₁ of 22, and when switch SW ₁ is open, the switch is
SW ₂ and SW ₃ are configured to be closed.
In other words, power is not being supplied to the VTR 22,
When this VTR 22 is not operating, even if the marker signal generation circuits ₂₃ and 24 generate a marker signal, the outputs of the AND gates ₂₅ and 27 are output from the OR gate 26 and 28 is not supplied. Therefore, no marker is displayed on either the subscreen or the main screen.

Next, let's talk about switching markers when replacing the main screen and sub screen.
SW ₀ is interlocked with switch SW ₄ and switch SW ₅ . When the movable contacts 16 and 17 of the changeover switch SW ₀ are switched to the fixed contacts 18 and 19, that is, when the A channel forms the main screen and the B channel forms the sub screen, Switch SW ₄ has been launched, and Switch
SW ₅ is about to be closed. Therefore, the gate 27 is turned off, the output of the marker signal generation circuit 24 is not supplied to the mixer circuit 8, and no marker is displayed on the main screen. However, the output of the marker signal generation circuit 23 is supplied to the mixer circuit 8 via the AND gate 25 and the OR gate 26, and as a result, the marker 33 is displayed at a predetermined position on the sub-screen 31 of the screen 30, as shown in FIG. will be done. At this time, the VTR 22 is recording the video signal of the B channel, and the sub screen 3
Since the image of the B channel is formed on the screen 1, it is easy to know from this that the screen currently being recorded on the VTR is that of the sub-screen 31.

When the movable contacts 16 and 17 of the changeover switch SW ₀ are switched to the fixed contacts 20 and 21 side, the B channel image is formed on the main screen 32 and the A channel image is formed on the sub screen 31 in conjunction with this. is formed. Further, as switch SW ₀ is switched, switch SW ₄ is closed and switch SW ₅ is opened. Therefore, this time, conversely, the AND gate 25 is turned off, and the output of the marker signal generation circuit 23 is not supplied to the mixer circuit 8, so that no marker is displayed on the sub-screen 31. However, the output of the marker signal generation circuit 24 is supplied to the mixer circuit 8 through the AND gate 27 and the OR gate 28, and as a result, the marker 33 is placed at a predetermined position on the main screen 32, as shown by the chain line in FIG. It will be displayed. At this time, the VTR22 is also B.
Since the video signal of the channel is being recorded and the image of the B channel is formed on the main screen, this shows that the screen currently being recorded on the VTR is that of the main screen 32. It is easy to know.

As described above, according to this television receiver, the marker 33 is formed on the image of the channel corresponding to the channel recorded by the VTR 22, and when the main screen and sub screen are replaced, Since the marker 33 also moves between the main screen and the sub-screen, the marker 33 is always formed on the image corresponding to the channel recorded by the VTR 22. Therefore, even if you frequently replace images on the main screen and sub-screen, the VTR2
It will never become unclear whether the screen recorded on 2 is the main screen 32 or the sub-screen 31.

In the above television receiver, the switches SW ₂ and SW ₃ are configured to operate in conjunction with the power switch SW ₁ of the VTR 22;
SW ₂ and SW ₃ from this television receiver to VTR
The switches SW 2 and SW 3 may be linked to a jack supplying a signal to the television set 22 so that the switches SW ₂ and SW ₃ are opened when the jack is connected to a television receiver.

Further, the switches SW ₂ and _{SW 3 are} configured as manual switches, and are opened only when _marker display is required.
Normally, it may be kept closed. In this way, an annoying marker will not be displayed on the main screen or the sub screen during normal image reception.

〓〓〓〓
Further, according to the above configuration, there is no difference in the display of markers when the VTR 22 is in the recording state and when it is in the standby state, but the display of the markers may be different in both states. i.e.
When the VTR 22 is in standby mode, the marker blinks, and when the VTR 22 is switched to recording mode, a detection signal of this switching is supplied to the marker signal generation circuits 23 and 24, so that the marker remains illuminated. You may also do so. or
The color of the marker may be different depending on whether the VTR 22 is in standby mode or in recording mode. Alternatively, the position of the marker may be changed depending on the state of the VTR.

Further, the shape of the marker display may be a mark of any shape, or may be a display consisting of characters, for example, the characters "REC".

Further, although this television receiver is configured so that the marker is displayed on the main screen or the sub-screen, the marker may be displayed on a portion other than the cathode ray tube screen. For example, as shown in FIG.
Small display parts 37 and 38 similar to the main screen and the sub-screen are provided on the screen 6, and either one of the display part 37 corresponding to the main screen and the display part 38 corresponding to the sub-screen shines. You can also do this. In this case, the marker signal generation circuits 23, 24 and related circuits become unnecessary, and when the switch SW ₀ is changed, the rear lamp of the display section 37 corresponding to the main screen or the display section 38 corresponding to the sub screen is turned on. All you have to do is selectively turn on the lamps on the back, which simplifies the configuration.

As described above, the present invention provides a two-screen television to which a video recording device such as a VTR is connected, which is equipped with _{a switch SW 0 for} exchanging the main screen and sub-screen.
SW ₄ , SW ₅ and display means 23 and 24 that are switched by the switches SW ₄ and SW ₅ and display the channels recorded on the VTR etc. are provided, so that the screen recorded on the VTR etc. To provide an easy-to-use two-screen television receiver in which it is possible to easily know whether the screen is a main screen or a sub-screen.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a two-screen television receiver showing an embodiment of the present invention, FIG. 2 is a front view of the same television receiver, and FIG. 3 is a television receiver showing a modification of the present invention. FIG. In addition, in the symbols used in the drawings, 22...
VTR, 23...Marker signal generation circuit (sub), 24
... Marker signal generation circuit (main), 31 ... Sub screen, 32 ... Main screen, 33 ... Marker. 〓〓〓〓

Claims (1)

[Claims] 1. It is configured to display the image receiving screens of two different channels simultaneously, and is provided with a first switch for exchanging the two image receiving screens, and so that the video signal of one channel can be recorded by the video recording device. In a television receiver made up of A television receiver characterized in that the display means displays which of the two image reception screens the image reception screen that can be recorded by the recording device is.