JPH0795493A - Television receiver - Google Patents

Abstract

PURPOSE:To recognize the types of video sources as necessary between the main and secondary screens by adding together the secondary video identification display signals for a prescribed time in response to the switched secondary screen video signals. CONSTITUTION:The main and secondary tuners 5M and 5S are selected by the channel selection signal received from a system control circuit 20. The switch circuits 3, 7M, 7S, 29 and 25 are switched and controlled by the circuit 20. The main and secondary video/chroma signal circuits 8M and 8S undergo the blanking in an up-down scanning channel selection state, etc. The main video identification display signal produced by a main character display circuit 19M is added to a video signal by an adder 17 placed between a switch circuit 9 and a CRT 18. Then the secondary video identification display signal produced by a secondary character display circuit 19S is added to a secondary video signal by an adder 11 placed between a matrix circuit 10 and an A/D converter 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver in which a sub-screen is displayed so as to fit into a main screen.

[0002]

2. Description of the Related Art In a conventional television receiver capable of displaying a sub-screen by inserting it into a main screen, the numbers of channels of the main screen and sub-screen or external video signal input terminals are displayed on the front panel. Even when using a display device such as an LED or displaying on the surface of a cathode ray tube, the channel of the main screen and sub screen or the number of the external video signal input terminal should be displayed together on the main screen. Was there.

[0003]

Therefore, in a conventional television receiver capable of displaying a sub-screen by fitting it into the main screen, the channels of the main screen and the sub-screen, and the numbers of the external video signal input terminals are used. It was not possible to reliably distinguish and recognize the type of video source such as.

In view of such a point, the present invention is a television receiver capable of displaying a sub-screen by fitting the sub-screen into the main screen, by reliably distinguishing the types of video sources of the main screen and the sub-screen when necessary. It tries to propose something that can be recognized.

[0005]

A television receiver according to the present invention comprises a synthesizing circuit 9 for synthesizing a sub-screen video signal with a main-screen video signal so that the sub-screen is projected so as to be fitted into the main screen. A first adder 17 for adding the main video identification display signal to the main screen video signal, and a second adder 11 for adding the sub video identification display signal to the sub screen video signal,
And a system control circuit 20 for controlling presence / absence of synthesis in the synthesis circuit 9 and presence / absence of addition in the first and second adders 17 and 11, and a sub-screen video signal synthesized with a main-screen video signal When the switching is performed, the system control circuit 20 controls the second adder 11 so that the sub-video identification display signal corresponding to the switched sub-screen video signal is added for a predetermined time. It is a feature.

[0006]

According to the present invention, the system control circuit 20 is provided.
Control of presence / absence of composition in the composition circuit 9 and presence / absence of addition in the first and second adders 17 and 11, and switching of the sub-screen video signal combined with the main-screen video signal. The second adder 11 is controlled so that the sub-picture identification display signal corresponding to the switched sub-picture video signal is added for a predetermined time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overall structure of a television receiver according to an embodiment will be described below with reference to FIG. This television receiver has a main television circuit MK and a sub-television circuit SK. Based on a video signal from the main television circuit MK, the main screen is projected on the entire tube surface of the cathode ray tube 18 and the sub-screen is displayed. Based on the video signal from the television circuit SK, the sub screen is projected on the screen so as to fit into a part of the main screen. These television circuits MK and SK respectively include tuners 5M and 5S, video intermediate frequency circuits 6M and 6S, and video / color signal circuits 8M and 8S.

An external video signal input terminal V ₁ to which a reproduced video signal (baseband signal) is supplied from a VTR or the like,
External video signals having V ₂ and V ₃ from these input terminals are switched to video signals from the tuners 5M and 5S by switch circuits 7M and 7S provided in the television circuits MK and SK, respectively. The image is supplied to the cathode ray tube 18 so that the image can be displayed.

The sub-television circuit SK is provided with a video signal processing circuit 12 for projecting the sub-screen on the cathode ray tube 18. This allows the sub-screen to distinguish a moving image, a still image, a frame shot image and the like. , The number of sub-screens, the position of the sub-screens on the main screen, etc. are controlled.

The television circuits MK and SK are provided with character display circuits 19M and 19S, respectively. The main screen and the sub-screen separately show the number of the television broadcast receiving channel and the external video signal input terminal. The image identification display is superimposed and displayed.

A system control circuit 20 including a microcomputer is provided to control each part of the television receiver.

Next, the structure of this television receiver will be described in more detail. The received signal from the antenna AT is supplied to the branching device 1. This branching device 1 is provided with a main tuner 5M through a switch circuit 3 with almost no attenuation of received signals.
Is supplied to the sub-tuner 5S. The received signal to the sub tuner 5S is the high frequency amplifier 4
Is amplified by. The switch circuit 3 switches the antenna input from the branching device 1 and the high frequency input from the auxiliary input terminal 2 from a descrambler for receiving cable television broadcasting, and supplies the high frequency input to the main tuner 5M.

The video intermediate frequency signal from the main tuner 5M is supplied to the frequency video intermediate frequency circuit 6M, and the video signal from this is supplied to the main switch circuit 7M so as to output from the external video signal input terminals V _{1 to} V ₃ . It is switched to an external video signal, and one of the video signals is the main video / color signal circuit 8M
Is supplied to. Incidentally, 26 is a monitor output terminal, which is connected to the output side of the main switch circuit 7M. The main video / color signal circuit 8M outputs red, green, and blue signals R, G, and B and supplies them to the switch circuit 9.

The audio intermediate frequency signal from the main video intermediate frequency circuit 6M is an audio circuit (incorporating an audio multiplexing circuit) 28.
It is supplied to the speech signal from the sound circuit 28 is supplied to the switch circuit 29, corresponding to the external video signal input terminal V ₁ ~V ₃ described above, the external audio signal input terminals A _1, A
₂ , switched to an external audio signal reproduced by a VTR or the like from A ₃ , and one of the audio signals is supplied to the speaker 31 via the low frequency amplifier 30.

The horizontal and vertical synchronizing signals from the main video / color signal circuit 8M are supplied to the deflection / high voltage circuit 27, and the deflection signal and high voltage DC voltage obtained from this are supplied to the cathode ray tube 18.

The video intermediate frequency from the sub-tuner 5S is supplied to the sub-video intermediate frequency circuit 6S, the video signal from this is supplied to the sub-switch circuit 7S, and the external video signal input terminals V _{1 to} V ₃ are supplied to the outside. After being switched to a video signal, one of the video signals and the video signal from the main switch circuit 7M is switched by the switch 25, and then supplied to the sub video / color signal circuit 8S. Red, green and blue signals R, G and B are obtained from the sub-picture / color signal circuit 8S,
After these are supplied to the matrix circuit 10 and converted into luminance, red color difference and blue color difference signals Y, RY, BY,
It is supplied to the A / D converter 13 of the video signal processing circuit 12.

This A / D converter 13 is disclosed in Japanese Examined Patent Publication No. 60-44.
A time division type A / D converter as disclosed in Japanese Patent No. 792. The digital signal from the A / D converter 13 is supplied to the memory 14 and written therein. The digital signal read from the memory 14 is supplied to the D / A converter 15 and converted into an analog signal. In the video signal processing circuit 12,
The lines and pixels of the video signal are thinned according to the size ratio of the main screen and the sub screen. The memory 14 has four frame (or field) memory areas according to the maximum possible number of sub-screens, for example, four. This memory 14 is controlled by the sub-screen control circuit 16 to display a moving image, a still image,
The number of sub-screens, the position of the sub-screens on the main screen, and the like are controlled according to the type of frame image, etc.

When a moving picture is displayed on the sub-screen, writing and reading of the video signal in the memory 14 are continuously and alternately repeated. When the sub-screen is to be a still image, the video signal is written in the memory 14 in units of frames or fields and then read repeatedly. In the case of a frame shot image of the sub-screen, a plurality of video signals are written in the memory 14 in units of frames or fields at different timings and then repeatedly read (see Japanese Patent Laid-Open No. 56-27573). The number of sub-screens fitted in the main screen is determined by the number of used memory areas in the memory 14, respectively. The contents of the sub-screen are a moving image, a still image and a frame image of the image signal from the sub-image / color signal circuit 8S, or a still image and a frame image of the image signal from the main image / color signal circuit 8M. The video signal is switched by switching the switch 25 described above. The video contents of the main screen and the sub screen are the main and sub tuners 5M, 5
The reception channels of S can be switched at the same time, or the main and sub switch circuits 7M and 7S can be switched at the same time.

Each color signal from the main video / color signal circuit 8M and each color signal from the A / D converter 15 of the video signal processing circuit 12 are supplied to the switch circuit 9 to select a part of the main screen. Both color signals are switched so that the sub-screen is fitted in a predetermined position. The switch circuit 9 is controlled by the sub-screen control circuit 16. The video signal from the switch circuit 9 is supplied to the cathode ray tube 18.

The main image identification display signal produced by the main character display circuit 19M is added to the image signal by the adder 17 provided between the switch circuit 9 and the cathode ray tube 18. Here, for example, the adder 17 is inserted only in the transmission path of the green signal, and the green image identification display is superimposed on the main screen. This image identification display may be in another color.

The sub-picture identification display signal produced by the sub-character display circuit 19S is supplied to the matrix circuit 10 and the A / D converter 1.
It is added to the sub video signal by the adder 11 provided between the three. Here, for example, the adder 11 is inserted only in the transmission path of the luminance signal, and the white image identification display is superimposed on the main screen. This image identification display may be in another color.

The main and sub tuners 5M and 5S described above are selected by a channel selection signal from the system control circuit 20. Switch circuits 3, 7M, 7S, 29 and switch 2
5 is switched and controlled by the system control circuit 20. The main and sub-picture / color signal circuits 8M and 8S are blanked by the system control circuit 20 at the time of up and down scanning channel selection. Incidentally, this blanking may be performed by providing a blanking switch in the preceding stage of the cathode ray tube 18. Also, the main and sub-picture intermediate frequency circuit 6
The main and sub horizontal synchronizing signals Hm and Hs from M and 6S and the main and sub vertical blanking signals (vertical signals) Vm and Vs from the main and sub video / color signal circuits 8M and 8S are supplied to the system control circuit 20. It Main and sub character display circuit 19
The M, 19S and sub-screen control circuit 16 are controlled by the system control circuit 20.

Reference numeral 21 is a last condition memory which is used when the power is cut off, such as channel selection channels of the main and sub tuners 5M and 5S, switching states of the switch circuits 7M and 7S, control states of the sub screen control circuit 16 and the like. The state of each part when the power is turned off is reproduced by the control of the system control circuit 20 when the power is turned on again.

Reference numeral 22 denotes a key device, which is the system control circuit 20.
It is equipped with various keys for controlling the television receiver.

Reference numeral 24 denotes a remote controller for controlling the television receiver, which is provided with various keys and which has a transmitter for transmitting a remote control signal based on the operation of the keys. A receiver 23 receives a transmission signal from the transmitter of the remote controller 24, and is connected to the system control circuit 20. This remote control signal is carried by light, radio waves, sound waves, or the like.

Next, examples of keys of the remote controller 24 will be listed. Power key, recall key (displays video identification display), mute key (voice silence), numeric keypad for selecting receiving channel and external video signal input terminal number, TV / VTR switching key, antenna input / Auxiliary high frequency input switching key, voice multiplex key. Picture up, main receiving channel (main external video signal input terminal number is acceptable), volume up / down keys respectively. Sub screen on / off key, sub receive channel and sub external video signal input terminal number up key, down key, still image key, frame shooting key, sub screen position movement key, main and sub screen image content Swap key.

Next, a method of superimposing the video identification display on the screen will be described with reference to the screen explanatory views of FIGS. FIG. 2A shows a case where only the main screen (moving image) M is displayed on the tube surface of the cathode ray tube 18, and the remote controller 2
When the recall key of No. 4 is pressed, the channel "14" as an image identification display is displayed in green on the upper right corner of the main screen M, for example. External video signal input terminal V
The numbers ₁ , V ₂ and V ₃ are, for example, “V1”, “V2”,
Displayed as "V3".

FIG. 2B shows, for example, three sub-screens S ₁ , S ₂ and S of still images extending vertically on the left side of the main screen (moving image) M.
_It shows a case where a framed image composed of ₃ is projected as if it were fitted, and when the recall key is pressed, channel "14" is displayed only on the main screen M.

FIG. 2C shows a case where the sub-screen (moving image) S is projected so as to be fitted in the lower left corner of the main screen (moving image) M, and when the recall key is pressed, the upper right corner of the main screen M is displayed. The channel “14” is displayed in the corner, and the channel “22” is displayed in white in the upper right corner of the sub-screen S.

FIG. 2D shows, for example, 4 of the main screen (moving image) M.
When the video image of the sub-screen and three still images S ₁ , S ₂ , S ₃ , and S _{4 at} different timings are displayed in the corner so that they are inset, the recall key is pressed. when the, upper-right corner of the main screen M with the channel "14" is displayed, the channel "22" is displayed in all four upper right corner of the sub-image S ₁ to S _4.

Next, description will be made with reference to FIG. Figure 3A
As shown in FIG. 3, when only the main screen (moving image) M is displayed, if the on / off key of the sub screen of the remote controller 24 is pressed, the sub screen (moving image) S ₁ is displayed as shown in FIG. 3B. then the channel "22" is for example on the sub-screen S _1, are displayed for 2 seconds, then the display of the channel "22" as shown in Figure 3C disappears.

When the main screen (moving image) M and the sub-screen (22-channel moving image) S ₁ are displayed as shown in FIG. 3D, if the up key or down key of the sub receiving channel of the remote controller 24 is pressed. , The image of the sub-screen S ₁ changes as shown in FIG. 3E, the channel “10” is displayed on the sub-screen S ₁ for 2 seconds, for example, and then the display of the channel “10” disappears as shown in FIG. 3F. .

As shown in FIG. 3G, when the main screen (14-channel moving image) M and the sub-screen (22-channel moving image) S ₁ are displayed, the video contents of the main controller and the sub-screen of the remote controller 24 are exchanged. When the key is pressed, the video contents of the main screen M and the sub-screen S ₁ are switched as shown in FIG. 3H, and the main screen M has a channel “22” and the sub-screen S ₁ has a channel “14” for, for example, 2 seconds. And then each channel “1” as shown in FIG. 3F.
The display of "4" and "22" disappears.

[0034]

According to the present invention described above, in a television receiver capable of displaying a sub-screen by fitting it into the main screen, channels of the main screen and the sub-screen, an external video signal input terminal when necessary. The type of the video source such as the number can be surely distinguished and recognized, and in particular, the sub-screen is switched when the sub-screen video signal combined with the main-screen video signal is switched. Can be confirmed and the type of the video source of the sub-screen can be recognized.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a screen of the embodiment.

FIG. 3 is an explanatory diagram of a screen of the embodiment.

[Explanation of symbols]

 9 Compositing Circuit (Switch Circuit) 11 Second Adder 17 First Adder 20 System Control Circuit

Claims (1)

[Claims] 1. A synthesizing circuit for synthesizing a sub-screen video signal with a main-screen video signal so that the sub-screen is displayed so as to be fitted into the main screen, and a main-video identification display signal with the main-screen video signal. A first adder for adding, a second adder for adding a sub-picture identification display signal to the sub-screen video signal, presence / absence of composition in the composition circuit, and addition in the first and second adders And a system control circuit for controlling the presence / absence of the sub-picture, the sub-picture corresponding to the switched sub-picture video signal when the sub-picture video signal combined with the main-picture video signal is switched. A television receiver characterized in that the system control circuit controls the second adder so that the identification display signals are added for a predetermined time.