JPH01286582A - Multi-screen receiver - Google Patents

Abstract

PURPOSE:To simplify the receiver by outputting a video signal displaying plural slave patterns in a master screen or a sub slave-pattern on a slave pattern. CONSTITUTION:A broadcast radio wave enters tuners 2, 3 from an antenna 1, a desired radio wave is received by channel selection signals 19, 20 to output video signals 21, 22. Then one of the two tuners 2, 3 is used in common in time division for a slave and a sub slave pattern or an external terminal is provided to output a video signal displaying plural slave patterns in a master screen or a sub slave-pattern on a slave pattern. Thus, it is not required to provide tuners of the number of master and slave patterns and the receiver is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-screen image receiving device, and more particularly to a TV receiver capable of simultaneous multi-screen display.

[Conventional technology]

Conventionally, this type of multi-screen image receiving apparatus has two tuners and a memory for storing images, and one child screen is displayed on the main screen.

FIG. 3 is a diagram of an example of a conventional multi-screen image receiving device. In this case, broadcast radio waves enter the tuners 2 and 3 from the antenna 1, respectively, and receive video signals 21.
It is output as 22. These signals 21 and 22 enter the system controller 4 and are supplied to the main screen signal switch 5 and the sub screen switch 6. From the system controller 4, there is a main screen signal switch 5. An A-D converter that outputs a switching signal for the small screen signal switch 6.

Memory 8. It generates control signals for the D-A converter 9 and the parent/child screen signal synthesizer 10, and also outputs control signals for the entire system. The output of the small screen signal switch 6 enters an A-D converter 7, and the signal digitized by the A-D converter 7 is written into a memory 8.

When displaying a sub-screen, the digital signal read from the memory 8 enters the D-A converter 9, and the sub-screen signal 24
is output, enters the parent-child screen signal synthesizer 10, is combined with the parent-child screen signal 23 from the parent-child screen signal switch 5, is output as a parent-child screen signal 25, and is supplied to the display, as shown in FIG. Parent screen A and child screen B1 surrounded by a solid line
It will be displayed like this. In this case, the child screen (B) can be displayed at any location like the child screens B2, B3, and B4 surrounded by dotted lines.

Note that an external video terminal can be provided to input a recording signal, but this terminal is only used for recording.

[Problem to be solved by the invention]

The conventional multi-screen image receiving device described above synthesizes the outputs of each tuner 2.3, so it requires as many tuners as there are main screens A and child screens B, which makes the device larger and more complex, and consumes less power. The disadvantage is that it also becomes larger.

SUMMARY OF THE INVENTION An object of the present invention is to solve these drawbacks and provide a multi-screen image receiving device that is smaller and simpler and consumes less power.

[Means to solve the problem]

The present invention has a main screen signal switching device that switches an input image signal consisting of a plurality of received video signals or reproduced video signals and outputs it as a main screen signal, and a main screen signal switch that switches the input image signal and outputs it as a sub screen signal. a signal switch for a sub-screen to convert the sub-screen signal into a digital signal;
a converter, a first image memory that stores the digitized screen signal, and a D-reader that reads out the output of the first image memory at a predetermined timing and converts it into an analog signal.
In a multi-screen image receiving device including an A converter and a signal synthesizer that combines the output of the D-A converter and the main screen signal and outputs the resultant as a composite video signal, the A-D converter and the D- A second image memory connected between the A converters and provided in parallel with the first image memory, or an external image inputting a video signal to the main screen signal switch and the sub screen signal switch. By providing an input terminal,
The present invention is characterized in that it is possible to output a video signal for displaying a plurality of child screens within the parent screen or a grandchild screen within the child screen.

〔Example〕

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a waveform diagram illustrating the operation shown in FIG. In this example,
Broadcast radio waves are from antenna 1 to tuner 2 and tuner 3.
, receives the desired radio wave using the channel selection signal 19°20, and outputs the video signal 21°22. These video signals 2
1.22 enters the system controller 4, as well as the signal switcher 5 for the parent screen and the signal switcher 6 for the child and grandchild screens.
supplied to From the system controller 4, there is a main screen signal switch 5. Signal switch for child and grandchild screens6. A-D
Converter 7. Memories 81, 82. DA converter9. Parent and child,
It outputs the control signal for the grandchild screen signal synthesizer 10 and also controls the entire system, and also controls the tuner 2's tuning number i 19. A tuning signal 20 for the tuner 3 is also output.

In FIG. 2, it is assumed that the video signal 21 is the main screen signal, and the video signal 22 is the child screen and grandchild screen signals.

During the 4-field period of timing T1 of the main screen signal 21, Tune 3 receives the K of the signal 22, which is digitized by the A-D converter 7 and written into the memory 8 during the period T'tt. . Also, during period T2, the tuner 3 receives M of the grandchild screen signal 22, and during period T21, A-
The data is digitized by the D converter 7 and written into the memory 88. In this way, every 4 fields on the main screen (T,,'r2
．． At every T3>, the video signal 22 becomes a signal and the signal M becomes an alternating signal depending on the channel selection signal 20.

When displaying a sub-screen, signals for two fields in period T11 are read out from the memory 81 in synchronization with the video signal 21, and
Period T 1. , the period T11 is set to 4 in the period of 8 fields.
The signal is read out twice by the DA converter 9 and input as a child and bare surface signal 24 to the parent and child and bare surface signal synthesizer 10 .

When displaying the bare surface, signals for two fields in period 21 are read out from the memory 82 in synchronization with signal 21, and
The period T2 is read out four times during the period of 8 fields of 2o1, converted into a child and bare surface signal 24 by the DA converter 9, and inputted to the parent child and bare surface signal synthesizer 10.

This video signal 21, that is, the main screen signal 23, is also input to the parent/child and bare surface signal synthesizer 10 and synthesized to form a composite signal 25, which is displayed on the display.

FIG. 5(a) is an example in which a main screen A and two sub-screens B1 and B2 are displayed, which can be displayed at any arbitrary location such as screens B, . . . B4. Furthermore, FIG. 5(b) is an example of the display of the main screen A, the sub-screen B1, and the bare surface C1, and the sub-screens B2 and B2, respectively.
Bs, B4 or bare surface c2. It can be displayed at any location such as C, , C4.

FIG. 3 is a block diagram of a second embodiment of the invention. The reproduced signal enters the amplifier 12 from the magnetic head 11 and becomes a reproduced video signal 27, the broadcast radio wave enters the tuner 3 from the antenna 1 and becomes the required received video signal 22, and furthermore, the video signal 26 from the external video terminal 13 is input. Ru. These reproduced video signal 27, received video signal 22, and external video signal 26 are input to the main screen signal switch 5' and the slave/bare screen switch 6', and are also supplied to the system controller 4'. From this system control 4', there is a main screen signal switch 5', a slave or bare surface switch 6'.
A/D converter 7', memory 8. Control signals for the D-A converter 9 and the parent, child, or bare surface signal synthesizer 10 are output to control the entire system.

As shown in FIG.
The output of the signal 22 is switched between K and M for every four fields of the video signal 27, and is input to the A-D converter 9.
Two fields of the period T11 are written into the memory 8 as two fields of the signal period T21. When displaying a child screen or a bare surface, the period T is set for the child screen,
The data T21 between the eight fields of . For the bare surface, T21 is read out four times during the 8 field period of T2ol and inputted to the DA converter 7.

In this way, 8 fields are read out at a time, and the pseudo-continuous or bare surface signal 24 enters the parent, child, or bare surface signal synthesizer 10, where it is combined with the parent screen signal 23, and the parent, child, or bare surface signal 25 The signal is then supplied to the display.

In this case, the screen display includes a main screen A and two child screens B1nB2 surrounded by solid lines, as shown in FIG. 5(a). At this time, the child screen can be displayed at any position on the screen, as shown by dotted line child screens B, B4. Also, Fig. 5(b)
A child screen B1 and a bare surface C1 as shown by solid lines can be displayed as shown in FIG. At this time, the child and bare surfaces can be displayed at any position on the screen as shown by dotted lines B2 to B4 and C2 to C4.

〔Effect of the invention〕

As explained above, the multi-screen image receiving device of the present invention can share one of the two tuners for the slave and bare surfaces in a time-sharing manner, or by providing an external terminal. This has the effect of allowing multiple monitors with a bare surface to be realized with a simple configuration. Note that since the child screen and the bare screen are smaller than the main screen, even if the signal is displayed for several fields, the continuity is not significantly impaired and the screen is sufficiently effective as a program monitor.

[Brief explanation of the drawing]

1 and 3 are block diagrams of the first and second embodiments of the present invention, and FIGS. 2 and 4 are block diagrams of the first and second embodiments of the present invention. A waveform diagram explaining each signal state in FIG. 3, FIG. 5(a),
(b) is an image display diagram on a display according to an embodiment of the present invention, and FIG. 6 is a block diagram of an example of a conventional multi-screen image receiving device.
FIG. 7 is a diagram showing an image displayed on the display of FIG. 1... Antenna, 2.3... Tuner, 4.4'.
...System controller, 5, 5'... Signal switch for main screen, 6, 6'... Signal switch for child and bare surface, 7... A-D converter, 8, 81. 82... Memory, 9... D-A converter, 10... Signal combiner for parent and child screens, 11... Magnetic head, 12... Amplifier, 13
... External video terminal, 19.20 ... Tuning signal, 21
22.27...Video signal, 23...Main screen signal, 24...Sub and bare surface signal, 25...Composition signal, 16...External video signal.

Claims (1)

[Claims] A main screen signal switching device that switches an input image signal consisting of a plurality of received video signals or reproduced video signals and outputs it as a main screen signal, and a sub screen signal switch that switches the input image signal and outputs it as a sub screen signal. an A-D converter that converts the small screen signal into a digital signal, a first image memory that stores the digitized screen signal, and an output of the first screen memory that converts the output of the first screen memory at a predetermined timing. A multi-screen image receiving device including a D-A converter that converts the read analog signal into an analog signal, and a signal synthesizer that synthesizes the output of the D-A converter and the main screen signal and outputs the synthesized video signal as a composite video signal. -D converter and the D-A
a second image memory connected between the converters and provided in parallel with the first image memory, or an external video input for inputting video signals to the main screen signal switch and the sub-screen signal switch; A multi-screen image receiving device, characterized in that it is equipped with a terminal to output a video signal for displaying a plurality of child screens within the parent screen or a grandchild screen within the child screen.