JP2545813B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field B Outline of Invention C Conventional Technology D Problems to be Solved by the Invention E Means for Solving Problems (Fig. 1) F Action G Example G ₁ Overall Example Structure (Fig. 1) G ₂ Main part of one embodiment (Figs. 2 and 3) H Effect of the invention A Industrial field of application The present invention is designed to display a sub screen in the main screen. Regarding a television receiver.

B Outline of the Invention The present invention is a television receiver of a sub-screen display type in a main screen, in which a main video signal or sub-video signals are sequentially cyclically field by field in a plurality of field memories respectively corresponding to a plurality of sub-screen areas. Is written in and read out from each sub-screen area to reproduce the shaded image.

C Conventional Technology Conventionally, a so-called picture-in-picture type television receiver (hereinafter abbreviated as P / P receiver) in which a sub-screen is displayed in the main screen is known.

As will be described later, the P / P receiver has a memory for reproducing an image on the sub screen, and writing to this memory,
A moving image can be reproduced on the sub-screen by repeating the reading continuously and alternately.

In a conventional P / P receiver, for example, JP-A-56-275
As disclosed in Japanese Patent Laid-Open No. 73-73, a plurality of still images at different timings of the image (main image) reproduced on the main screen are reproduced on the sub screen.

In addition, the applicant has already filed Japanese Patent Application No. 60-297329,
P / P that allows you to easily capture and play both the main screen image and the sub screen image depending on whether or not there is a sub screen.
Proposing a receiver.

In the already proposed P / P receiver, as shown in FIG. 4A, when the moving image key is operated when the moving image is reproduced only on the main screen M, as shown in FIG. , On the left side of the main screen M, for example, three sub-screens S ₁ , S ₂ , and S ₃ appear in the vertical direction, and the sub-images of the main image are reproduced on these sub-screens at different timings of, for example, 0.2 seconds. To be done.

Further, as shown in FIG. 6C, when moving images are operated in the main screen M and the sub-screen S ₁ , respectively, when the shooting image key is operated, as shown in FIG. For example, in the four corners, the moving image of the sub-screen S ₁ of FIG. C and the three sub-screens S ₂ , S ₃ , S _{4 are} displayed.
And the captured images with different timings are reproduced.

D. Problems to be Solved by the Invention The present invention is a sub-screen display type in a main screen that enables reproduction of a drop image of a plurality of sub-screens in addition to the sub-screen reproduction function of the already proposed example as described above. It is intended to provide a television receiver of.

E Means for Solving Problems The present invention provides a television receiver adapted to display a sub-screen in the main screen by providing a plurality of sub-screen areas S _{1 to} S ₄ in the main screen M. It has a system control circuit (20) that judges whether or not the sub-screen is displayed by operating the drop key, and this system control circuit (20) judges that the sub-screen is displayed. when I, along with write to multiple field memory respectively corresponding to a plurality of sub-screen areas _{S 1 ~S 4 (101) ~} (104) a sub-picture signal sequentially cyclically in field units, the written video signal The circular images are sequentially and cyclically read from the plurality of field memories (101) to (104) to reproduce the same dropped images in the plurality of sub-screen areas S _{1 to} S ₄ , and the main screen M is displayed by the system control circuit (20). When it is determined that A main image signal is sequentially written to the field memories (101) to (104) of the surface M in units of fields, and the written video signals are sequentially read from the field memories (101) to (104) to produce a blurred image of the main screen M. Is reproduced, and the writing / reading operation of the video signal in the field unit is stopped by operating the on / off key of the sub-screen.

According to the present invention having the F function, a trailing image is reproduced on a plurality of sub-screens, and a moving screen is seen in the sub-screens, which can visually attract the user's interest.

G Embodiment An embodiment of the television receiver according to the present invention will be described below with reference to FIGS. 1 to 3.

G ₁ Overall Configuration of One Embodiment First, the overall configuration of a television receiver of one embodiment will be described with reference to FIG.

This television receiver has a main television circuit MK and a sub-television circuit SK, and the main television circuit MK
The main screen is projected on the entire tube surface of the picture tube (18) based on the video signal from, and the sub screen is fitted into a part of the main screen based on the video signal from the sub television circuit SK. Projected on the surface. These television circuits MK and SK are tuners (5M), (5S), video intermediate frequency circuits (6M),
Equipped with (6S) and video / color signal circuits (8M), (8S).

Also, playback video signal (baseband signal) from VTR, etc.
External video signal input terminals V ₁ , V ₂ and V ₃ supplied to the television circuit.
The video signals from the tuners (5M) and (5S) are switched by the switch circuits (7M) and (7S) provided in the MK and SK, respectively, and are supplied to the picture tube (18) to display the video. It is designed to get you.

The sub television circuit SK is provided with a video signal processing circuit PV for displaying a sub screen on the picture tube (18),
With this, it is possible to control the moving image, the still image, the shot image, the drop image, etc. of the sub-screen, the number of sub-screens, the position of the sub-screen on the main screen, and the like.

Each of the television circuits MK and SK has a character display circuit (19
M) and (19S) are provided so that the image identification characters such as the receiving channel number of the television broadcast and the external video signal input number are superimposed and displayed on the main screen and the sub screen separately. ing.

A system control circuit (20) including a relatively inexpensive general-purpose microcomputer is provided to control each part of the television receiver.

Next, the configuration 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 a main tuner (5M) through the switch circuit (3) with almost no attenuation of the received signal.
To a sub-tuner (5S) through the high-frequency amplifier (4). As a result, the quality of the received signal of the main tuner (5M) is ensured and the branch loss for the sub tuner (5S) is compensated. The switch circuit (3) switches between the antenna input from the switch (1) and the high frequency input from the auxiliary input terminal (2) such as a descrambler for receiving pay television broadcasts to the main tuner (5M). Supply.

The video intermediate frequency signal from the main tuner (5M) is supplied to the main video intermediate frequency circuit (6M), the video signal from this video detection circuit is supplied to the main switch circuit (7M), and the external video signal input terminal It is switched to the external video signal from V _{1 to} V ₃ , and one of the video signals is supplied to the main video / color signal circuit (8M). Mo is a monitor output terminal and is connected to the output side of the main switch circuit (7M). From this main video / color signal circuit (8M), red, green and blue signals R, G, B
Is output and supplied to the switch circuit (9).

The audio intermediate frequency signal from the main video intermediate frequency circuit (6M) is supplied to the audio circuit (which includes an audio multiplexing circuit) (27), and the audio signal from the audio circuit (27) is switched to the switch circuit (7A). Is supplied to the external video signal input terminal V ₁ described above.
Corresponding to ~V _3, from the outside the audio signal input terminals A _1, A _2, A ₃
It is switched to an external audio signal reproduced from a VTR, etc., and one of the audio signals is passed through the low frequency amplifier (28),
It is supplied to the speaker (29). It should be noted that two systems of low-frequency amplifiers and speakers are provided to support stereo audio signals.

Horizontal and vertical synchronizing signals from the main video / color signal circuit (8M) are supplied to the deflection / high voltage circuit (26), and the deflection signal and high voltage DC voltage from this are supplied to the picture tube (18).

The video intermediate frequency signal from the sub tuner (5S) is supplied to the sub video intermediate frequency circuit (6S), the video signal from the video detection circuit of this is supplied to the sub switch circuit (7S), and the external video signal input terminal V ₁ is switched to the external video signal from ~V _3, one video signal and the main switch circuit of which (7
The video signal from M) is switched by the switch (25) and then supplied to the sub-video / color signal circuit (8S).

The video signal processing circuit PV consists of a memory (10) and an A / D converter (1
1), a D / A converter (12) and a sub-screen control circuit (13). Red obtained from sub-picture / color signal circuit (8S),
The green and blue signals R, G, B are supplied to the matrix circuit (14) and converted into luminance, red color difference and blue color difference signals Y, RY, BY, and then A of the video signal processing circuit PV. It is supplied to the / D converter (11). This A / D converter (11) is a time division type A / D converter as disclosed in Japanese Patent Publication No. 60-44792.

Digital signal from A / D converter (11) is stored in memory (10)
To be written to. The digital signal read from the memory (10) is supplied to the D / A converter (12) and converted into an analog signal. In the video signal processing circuit PV, the lines and pixels of the video signal are thinned according to the dimensional ratio of the main screen and the sub screen, for example, 3: 1. Memory (10)
It has four frame (or field) memory areas according to the maximum possible number of sub-screens, eg, four. This memory (10) is controlled by the sub-screen control circuit (13) such as moving image / still image of the sub-screen, captured image, drop-out image, etc., number of sub-screens, position of the sub-screen on the main screen, etc. To be done.

When the sub-screen is to be a moving image, writing and reading of the video signal in the memory (10) are continuously and alternately repeated.
When the sub-screen is to be a still image, the video signal is written in the memory (10) in units of frames or fields and then read repeatedly. When the sub-screen is to be captured, a plurality of video signals are written in the memory (10) in units of frames or fields at different timings and then read out repeatedly (see Japanese Patent Laid-Open No. 56-27573). The reproduction of the dropout image of the sub screen will be described in detail in another section.

The number of sub-screens to be fitted in the main screen is determined by the number of used memory areas in the memory (10). The contents of the sub-screen include moving picture, still image, shot image, drop image of the video signal from the sub video / color signal circuit (8S) or still image of the video signal from the main video / color signal circuit (8M). In the case of a captured image and a shot image, switching of these video signals is performed by switching the above-mentioned switch (25). The image contents of the main screen and the sub screen are the simultaneous switching of the receiving channels of the main and sub tuners (5M) and (5S), or the main and sub switch circuits (7
It can be switched by simultaneously switching between M) and (7S).

The respective color signals from the D / A converter (12) of the video signal processing circuit PV are three primary color signals R, G, in the matrix circuit (15).
It is converted back to B and supplied to the switch circuit (9). Each color signal from the main video / color signal circuit (8M) is supplied to the switch circuit (9), and both color signals are supplied so that the sub-screen is fitted in a selected predetermined position on a part of the main screen. Can be switched. The switch circuit (9) is controlled by the sub-screen control circuit (13). The video signal from the switch circuit (9) is supplied to the picture tube (18).

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

The sub-image identification character signal generated by the sub-character display circuit (19S) is added to the sub-video signal by the adder (16) provided between the matrix circuit (14) and the D / A converter (11). . Here, the adder (16) is inserted only in the transmission path of the luminance signal Y, for example, so that the white sub-image identification character is superimposed on the sub-screen. This sub-image identification character may have another color.

The main and sub tuners (5M) and (5S) described above are controlled by a channel selection signal from the system control circuit (20). The switch circuits (3), (7M), (7S), (7A) and the switch (25) are switched and controlled by the system control circuit (20). Main and sub video / color signal circuit (8M), (8S)
The video signal is forcibly blanked by the system control circuit (20) at the time of sequential channel selection of up and down. Incidentally, this blanking may be performed by providing a blanking switch in front of the picture tube (18). The main and sub-horizontal synchronizing signals Hm and Hs from the main and sub-picture intermediate frequency circuits (6M) and (6S) and the main and sub-picture / color signal circuits (8
The main and sub vertical blanking signals (vertical signals) Vm and Vs from M) and (8S) are supplied to the system control circuit (20). The main and sub character display circuits (19M) and (19S) and the sub screen control circuit (13) are controlled by the system control circuit (20).

(21) is the last condition memory, which is the main and sub tuner (5M), (5S) channel selected when the power is cut off,
The system control circuit (20) displays the switching states of the switch circuits (7M) and (7S), the control state of the sub-screen control circuit (13), etc.
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) is a key device attached to the receiver main body and is connected to the system control circuit (20). This key device is provided with various operation keys for controlling the television receiver, such as a power key, main reception channel and volume up / down keys.

(24) is a remote controller for controlling the television receiver, which is provided with various keys and has a transmitter for transmitting a remote control signal based on the operation of the keys.
Reference numeral (23) is a receiver for receiving a reception 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 this remote controller (24) are listed. Power key, recall key (displays image identification characters), mute key (silence of sound), numeric keypad for selecting receiving channel and external video signal input, TV
/ VTR switch key, antenna input / auxiliary high frequency input switch key, voice multiplex key. Picture, main reception channel number, main external video signal input number and volume up and down keys respectively. Sub screen on / off key, sub reception channel number and sub external video signal input number up key, down key, still image key, shot image key, drop image key, sub screen position movement key, main screen and Replacement key for subscreen image contents.

Main Part of One Embodiment of G ₂ Next, the main part of one embodiment of the present invention relating to the level control of the sub-picture signal will be described with reference to FIGS. 2 and 3.

FIG. 2 shows the configuration of the main part of one embodiment of the present invention. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In FIG. 2, (101A) and (101B) are field memories, and each input side has a changeover switch (11
The output terminals are connected to the fixed contacts (111a) and (111b) of (1), respectively, and each output side is connected to the fixed contacts (121a) and (121b) of the changeover switch (121). The movable contact (111c) of the changeover switch (111) is the step switch (110).
Is connected to the first fixed contact (110 ₁ ) of the D / A converter (1 1).
2) Supplied to.

Similarly, three pairs of field memories (102A), (102A)
B); (103A), (103B); (104A), and (104B) are connected to the respective input sides by selector switches (112), (113), (11).
4) via the fixed contact (11) of the step switch (110)
0 ₂ ), (110 ₃ ), (110 ₄ ), and the outputs of these field memories (102 A) to (104 B) respectively switch the changeover switches (122), (123), (124). Is supplied to the DA converter (12) via the movable contact (110 ₀ ) of the step switch (110) and is connected to the input terminal IN.

Controlled by the output of the sub-screen control circuit (13), the movable contact (110 ₀ ) of the step switch (110) advances one step for each field, and the changeover switches (111) to (114)
Are switched interlockingly every four fields, and the switches (121) to (124) are sequentially switched every one field.

Next, the dropout image reproducing operation will be described with reference to the flowchart of FIG.

First, it is assumed that the step switch (110), the changeover switches (111) to (114), and (121) to (124) in FIG. 2 are in the connection state shown in the figure.

When the drop-out image key is operated, the system control circuit (20) in FIG. 1 determines whether or not the sub-screen is displayed (step), and depending on this determination, the main image or the sub-image is displayed. Overrun playback is specified (step,
).

During the first field # 1, the video signal supplied to the input terminal IN in real time is the movable contact (110 ₀ ) and fixed contact (110 ₁ ) of the step switch (110);
It is supplied to the field memory (101A) via the movable contact (111) and the fixed contact (111) of 1) and written in it.

During the next field # 2, the switch (121) is switched to a connection state opposite to that shown in the figure, and the read clock controlled by the control circuit (13) causes the field memory (101A) to output the video signal of the field # 1. Is read (step).

In the period of this field # 2, the movable contact (110 ₀ ) of the step switch (110) is advanced by one step,
The video signal of the input terminal IN is transferred to the field memory (102) via the fixed contact (110 ₂ ) and the changeover switch (112).
A) and is written to it.

During the next field # 3, the switch (122) is switched to the connection state opposite to that shown, and the video signal of field # 2 is read from the field memory (102A) (step).

Thereafter, in the same manner, the video signals of the fields # 3 and # 4 are sequentially written into the field memories (103A) and (104A) and read (step,).

During fields # 5 to # 8, switches (111) to (1
14) is switched to the state opposite to that shown, and the switch (12
1) to (124) are sequentially connected in the illustrated state, and the video signal is sequentially written in the field memories (101B) to (104B) and read from this. Then, the operation of writing and reading the video signal in field units as described above is repeated until it is determined that the sub-screen on / off key has been operated (step).

Each pair of field memories (101A), (101B); ~
(104A), the video signal of the field unit read from (104B), such as shown in FIG. 4, supra, are sequentially and cyclically distributed to the sub-screen S ₁ to S ₄ 4 corners of the main screen M , On each sub-screen, one image is reproduced every four fields, and images with the same content are reproduced without any errors. That is, since the sub-screen S ₁ to S within ₄ to change while moving four screens, even in a position where the sub-picture is separated as in FIG. 4 D, clarify the operation of the writing end and operation of the writing starting It will be possible to judge.

The switches (111) to (114) and the switch (12
1) to (124) are linked from the state shown in the figure to 1
You may make it switch for every field. Also,
It is also possible to use four field memories and sequentially read from each field memory while sequentially writing the video signal in each field memory.

Further, the writing cycle to each field memory may be controlled.

H Effect of the Invention As described in detail above, according to the present invention, it is possible to render reproduced images of a plurality of sub-screens to be full-scale images with the same content, and to attract the user's interest. A sub-screen display type television receiver can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall construction of an embodiment of a television receiver according to the present invention, FIG. 2 is a connection diagram showing the construction of the essential parts of an embodiment of the present invention, and FIG. FIG. 4 is a flow chart for explaining the operation of the embodiment, and FIG. 4 is a schematic diagram for explaining the present invention. (5M) is the main tuner, (5S) is the sub tuner, (6M) is the main video intermediate frequency circuit, (6S) is the sub video intermediate frequency circuit, (8
M) is the main video / color signal circuit, (8S) is the sub video / color signal circuit, (20) is the system control circuit, (101), (102),
(103) and (104) are field memories, and PV is a video signal processing circuit.

Claims (1)

(57) [Claims] 1. A television receiver adapted to display a sub-screen in the main screen, wherein a plurality of sub-screen areas are provided in the main screen, and the sub-screen is displayed by operating a dropout key. When it is determined by the system control circuit that the sub-screen is being projected, the system control circuit that determines whether or not the sub-screen is displayed is stored in a plurality of field memories respectively corresponding to the plurality of sub-screen areas. Sub-video signals are sequentially and cyclically written in units of fields, and the written video signals are sequentially and cyclically read from the plurality of field memories to reproduce the same image in the plurality of sub-screen areas. When the system control circuit determines that the main screen is displayed, the main video signal is sequentially written to the field memory of the main screen in units of fields. In addition, the written video signal is sequentially read from the above field memory to reproduce the main screen dropout image, and the sub-screen ON / OFF key is operated to stop the writing / reading operation of the field-based video signal. Television receiver characterized by.