JPH0355074B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a television receiver.

(Prior art) Currently, in the state of television broadcasting in Japan,
The number of broadcast stations that can be received in one area is nine channels at most, so if images of about nine channels can be displayed simultaneously on one screen, viewers can check the broadcast contents of all broadcast channels in that area at a glance. This is convenient because it eliminates the need to perform channel switching operations many times to check the broadcast contents of each channel before selecting the channel of the broadcast you want to watch.

In contrast, conventional television receivers configured to be able to simultaneously display two channels of images, a main image and a sub-image, on one CRT screen have been disclosed, for example, in Japanese Patent Laid-Open No. 49-2419. It has been proposed by and partially put into practical use. However, the above-mentioned television receiver cannot display two channels of images on one screen, and if you want to display more images, you have to install more channels for the number of images. There is a drawback that it is practically impossible to simultaneously display images of all broadcast channels in one area on one screen using the conventional method.

In addition, in the past, it was difficult to realize simultaneous display, so it was not possible to consider whether or not the selected channel was being broadcast, and the channel that was not being broadcast was selected and the noise screen was There are drawbacks that appear.

Furthermore, as video recording and reproducing devices are becoming more common these days, it is desired that the video obtained from the video recording and reproducing device be treated in the same way as the video of a received broadcast television program.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and uses a single tuner and an input switching unit to display a plurality of images from television broadcasting and video recording and playback on one screen. Preferably, nine images can be displayed simultaneously, and the content of all broadcast channels in one area can be checked at a glance without complicating or increasing the size of the receiver. The purpose is to eliminate the trouble of repeating operations over and over again, while also preventing noise images from appearing on the screen.

(Structure of the invention) In order to achieve such an object, the present invention has the following features:
The input switching section selects one of the reception channels switched at a constant cycle by a single tuner and the video channel to which the video recording/playback device is connected as the input channel, and one of the video signals obtained from this input channel is selected. Images are stored in a buffer memory in synchronization with the synchronization signal in the composite video signal, and television synchronization based on clock pulses is performed in the display memory, which has multiple storage areas that can store data for one image of each channel's video signal. In synchronization with the signal, the memory in the buffer memory is transferred during the vertical retrace period of the television synchronization signal, and the video signals stored in the display memory are sequentially read out during the display scanning period of the television synchronization signal to display one screen. images from multiple channels to
A television receiver that displays on a CRT,
a tuning section that switches the receiving channel of the tuner; an input switching section that selects either the selected receiving channel or the video channel as an input channel; and an image of the video signal of the input channel selected by the input switching section. a display memory having a plurality of storage areas capable of storing one screen worth of each video signal of any one selected input channel; The buffer memory control section controls writing to the CRT, the video output section outputs the video signal to the CRT, and the deflection output section outputs the deflection control signal to the deflection coil of the CRT. A video signal switching unit and a synchronization signal switching unit that switch to the display memory side, and a display memory that generates a television synchronization signal from a clock pulse and performs writing to and reading from the display memory in synchronization with the television synchronization signal. A control unit, a central control unit that controls the operation of each of the units, and an operation unit that is operated to switch the display mode of the CRT display device between a single image display mode and a multiple image display mode, the central control unit When the multiple image display mode is selected by the operation section, it is determined whether or not a composite video signal is input to the input channel based on the synchronization signal, and if there is no input, the tuner and input switching section It is characterized in that it is configured to instruct the switching according to a predetermined program, and when there is a video signal, write the video signal in the buffer memory.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram of the entire television receiver according to an embodiment of the present invention, and this receiver consists of a main circuit section M and a plurality of image/audio processing circuit section P.

The main circuit section M includes an antenna 1, a single tuner 2, a video amplifying section 3, and a video signal processing section 4.
, a synchronization signal processing section 5, a video output section 8, a deflection output section 9, a CRT 10, a deflection coil 10a,
It includes an audio signal processing section 11, an audio output section 13, and a speaker 14. Further, this main body circuit portion I has a video channel 31 to which a video recording and reproducing device (not shown) is connected, and this video channel 31 is connected to the video amplification section 3, to a video signal processing section 4, and to a synchronization signal processing section 5. An input switching section 30 is provided to selectively connect to the input terminal. Further, a video signal switching section 6 is provided between the video signal processing section 4 and the video output section 8, a synchronous signal switching section 7 is provided between the synchronous signal processing section 5 and the deflection output section 9, and an audio signal processing section 7 is provided between the video signal processing section 4 and the video output section 8. An audio signal switching section 12 is interposed between the section 11 and the audio output section 13, respectively.

The plurality of image and audio processing circuit portion P includes a tuning section 15 that switches reception channels of the tuner 2.
, a multiplexer 16 that introduces the video signal from the video signal processing section 4, an A/D converter 17 that converts the analog signal from the multiplexer 16 into a digital signal, and a video signal for one image (one field). buffer memory 18 for temporarily storing the information, the tuner 2 and the input switching section 30
a buffer memory control unit 19 that controls writing to the buffer memory 18 based on the synchronization signal of the input signal of the input channel selected by the input channel; a reference oscillation circuit 20 that outputs a clock pulse;
A display memory 21 stores one field of video signals for each of a plurality of channels (nine channels in this embodiment) to be displayed on the CRT 10, and generates a television synchronization signal from the clock pulse of the reference oscillation circuit 20, and generates a television synchronization signal from the clock pulse of the reference transmitter circuit 20. a display memory control unit 22 that controls writing to and reading from the display memory 21 using a digital synchronization signal; a D/A converter 23 that converts the digital video signal read from the display memory 21 into an analog video signal; an audio signal generating section 29 that outputs an audio signal that becomes a background sound;
A control signal output section 28 that operates the video signal switching section 6, the synchronization signal switching section 7, the audio signal switching section 12, and the audio signal generation section 29, the buffer memory control section 19, the display memory control section 22, and the control signal output section 28. The central control unit (hereinafter referred to as
(referred to as CPU) 24, a program ROM 25 that stores the program of this CPU 24, and a workpiece.
It includes a RAM 26 and an operation section 27 that is operated to select the display mode of the CRT 10 between a single image display mode and a multiple image display mode.

In the above configuration, by operating the operation unit 27 and selecting the single image display mode, the image of the desired one reception channel or video channel is displayed on the screen of the CRT 10 like a normal television receiver. At the same time, the audio of that channel is output from the speaker 14, and by operating the operation unit 27 and selecting the multiple image display mode, images of multiple reception channels and video channels are displayed simultaneously on the screen of the CRT 10. At the same time, a predetermined background sound is output from the speaker 14. Below, the operation in each display mode will be explained, including a detailed explanation of the configuration of the CPU 24.

(a) Operation in single image display mode When the single image display mode is selected on the operation unit 27, the operation of the CPU 24 is stopped;
The input switching section 3 connects the tuner 2 directly to the video signal processing section 4 and the synchronization signal processing section 5.
0 is switched, and the video signal switching unit 6 is configured to directly connect the video signal processing unit 4 to the video output unit 8.
is switched, the synchronizing signal switching section 7 is switched so as to directly connect the synchronizing signal processing section 5 to the deflection output section 9, and the audio signal switching section is switched so as to directly connect the audio signal processing section 11 to the audio output section 13. 12 can be switched. In addition, the channel selection section 1
5 and the operation of the audio signal generating section 29 is as follows.
It is stopped when the CPU 24 is stopped.

Therefore, in this single-screen display mode, the television radio waves of the reception channel received by the antenna 1 and selected by the tuner 2 are amplified as composite video signals by the video amplifying section 3, and then sent to the input switching section. 30, the signal is input to the video signal processing section 4 and the synchronization signal processing section 5. The video signal processing section 4 separates the video signal from the composite video signal, and further separates it into a luminance signal (Y signal) and two color difference signals (RY signal, BY signal). The output of the video signal processing section 4 is input to the video output section 8 via the video signal switching section 6. On the other hand, the synchronization signal processing section 5 separates both horizontal and vertical synchronization signals from the composite video signal and outputs them to the deflection output section 9. Then, from the video output section 8 to the CRT1
output to 0 and the deflection coil 10a of the deflection output section 9
By synchronizing the output to CRT10
An image of one arbitrarily selected channel is displayed on the screen.

Further, the television signal of this arbitrarily selected channel is input from the tuner 2 to the audio signal processing section 11. The audio signal is separated in the audio signal processing unit 11 and input to the speaker 14 via the audio output unit 13, from which the audio of the arbitrarily selected channel is output. .

(b) Operation in multiple image display mode When the multiple image display mode is selected on the operation unit 27, the CUP 24 operates,
Each part is controlled so that a plurality of images are simultaneously displayed on the screen of the CRT 10 and a predetermined background sound is played from the speaker 14.

First, the video signal will be explained as follows.

The CPU 24 instructs the channel selection unit 15 to select one of the plurality of reception channels, for example channel A, as the first reception channel via the control signal output unit 28, The input switching section 30 is switched so that the tuner 2 is connected to the video signal processing section 4 and the synchronizing signal processing section 5. As a result, the A channel is selected in the tuner 2, and the signal of the A channel is inputted to the video signal processing section 4 and the synchronizing signal processing section 5 via the video amplification section 3. Said CPU24
is the video signal switching unit 6 via the control signal output unit 28.
is switched so that the D/A converter 23 is connected to the video output section 8. Therefore, the video signal separated by the video signal processing section 4 is sent to the multiplexer 1.
6 and is separated into a Y signal, a RY signal, and a BR signal, and sequentially outputted to an A/D converter 17. These signals are converted into digital signals by the A/D converter 17 and then input to the buffer memory control section 19. On the other hand, the synchronization signal switching section 7 is controlled by the control signal output section 2 by the CPU 24.
8 to the display memory control section 22 through the deflection output section 9
can be switched to connect to. Therefore, the synchronization signal output from the synchronization signal processing section 5 is
24 and is input to the buffer memory control section 19.

The CPU 24 counts horizontal synchronization signals within one vertical period, and determines whether or not the input channel is broadcasting depending on whether or not there are a predetermined number of horizontal synchronization signals.
The next reception channel is selected by the , and in the same manner, it is determined whether or not a composite video signal is input to the input channel, and if there is no composite video signal input, the next reception channel is selected. By repeating such a procedure, a receiving channel with a synchronizing signal, that is, a receiving channel that is currently being broadcast is searched for. If the receiving channel that is currently broadcasting cannot be found even after repeating these steps until the specified channel number is reached,
The input switching unit 30 is switched to the video channel 31 side by the CPU 24 . Then, in the same manner, it is determined whether or not a synchronization signal is input to the video channel 31, and if a synchronization signal is not input, the input switching section 30 is returned to its original position and broadcasting starts again from the first reception channel. Search for incoming channels. In this way, when an input channel to which a synchronization signal is input is found, one image of the video signal input to the buffer memory control section 19 is synchronized with the horizontal synchronization signal from the synchronization signal processing section 5. That is, the data is written into the buffer memory 18 at the timing of the buffer memory control section 19. Therefore, noise input during the display scanning period of an input channel to which no synchronizing signal is input to the buffer memory 18, that is, a receiving channel without broadcasting or a video channel 31 without input from a video recording/reproducing device, is stored in the buffer memory 18. is not recorded in
Only one image of a video signal obtained from a receiving channel for broadcasting or a video channel inputting a composite video signal from a video recording/reproducing device is sequentially written into the buffer memory 18. After the writing to the buffer memory 18 is completed, the display memory control unit 22 displays a predetermined amount of data stored in the buffer memory 18 during the vertical return period in synchronization with the television synchronization signal generated from the clock pulse of the reference oscillation circuit 20. The data is transferred to the memory 21. All the memories in the buffer memory 18 are transferred to a predetermined partial screen, for example 1 in FIG.
The video signal of the th partial screen A is configured. Next, in order to configure the video signal for the second partial screen B, the input channel that is currently being broadcast is searched again from the input channel next to the input channel written in the buffer memory 18 previously, and one screen of that video signal is searched again. Similarly, the minutes are temporarily stored in the buffer memory 18 and transferred to the display memory 21. After forming partial screens A to I using the same procedure, in order to configure partial screen A again, an input channel containing a composite video signal is searched from the first receiving channel. Here, when the number of input channels with composite video signals is smaller than the number of partial screens, for example,
When the number of input channels with composite video signals is 6 for 9 partial screens, the last 3
For the three partial screens G, H, and I, the video signals of the first and three partial screens A, B, and C are taken into the display memory 21 again. In addition, when the number of input channels having composite video signals is greater than the number of partial screens, the recording area of the last partial screen I in the display memory 21 is recorded one after another at a constant cycle for input channels having subsequent composite video signals. Rewrite to channel video signal. Since the video signal switching section 6 is switched so that the D/A converter 23 is connected to the video output section 8 as described above, the television synchronization signal is switched during the subsequent display scanning period of the television synchronization signal. The video signals sequentially read out from the display memory 21 in synchronization with are converted from digital signals to analog signals by the D/A converter 23, and then passed through the video signal switching unit 6 and the video output unit 8 to the
Output to CRT10. Further, the television synchronization signal is outputted from the display memory control section 22 to the deflection coil 10a through the synchronization signal switching section 7 and the deflection output section 9. In this way, the CRT
Nine images are displayed simultaneously on ten screens.

When the number of receiving channels being broadcast and the number of video channels inputting video playback video signals is less than the number of partial screens, the memory stored in the display memory 21 is stored in the first screen by the number of remaining partial screens.
Since the video signals of the second and subsequent partial screens are taken into the display memory 21 again, the first and subsequent images are repeatedly displayed on the remaining partial screens, and there is no noise screen portion. In addition, when the number of input channels having composite video signals is greater than the number of partial screens, the recording area of the last partial screen I in the display memory 21 is recorded one after another at a constant cycle for input channels having subsequent composite video signals. Since the video signal of the channel is rewritten, the images of the input channel with the synchronization signal from the last partial screen I are displayed in order at a fixed period on the final partial screen I, and all the images of all receiving channels and video channels that are being broadcast are displayed in order. You will be able to display the image.

Further, the memory in the buffer memory 18 is transferred to the display memory 21 and then rewritten with the video signal of the subsequent receiving channel being broadcast or the video channel inputting the video playback video signal,
The video signals are sequentially recorded in the storage area of the display memory 21, and when the video signals of all the partial screens of the CRT 10 are recorded in the display memory 21, the same procedure is repeated again to store the video signals in the display memory in order from the first partial screen. For example, if broadcasts end one after another late at night, the synchronization signal of the reception channel will be lost, so when the image on partial screen D disappears, the memory in each storage area of 21 will be updated. Until then, the displayed video signal is on partial screen E.
, the image of partial screen E is packed into partial screen D, and similarly the image of partial screen F is packed into partial screen E, resulting in a noise screen part. Without,
Videos from channels that have finished broadcasting will be automatically deleted. In addition, for a newly opened channel, for example, when a reception channel C' between a reception channel of partial screen C and a reception channel of partial screen D is opened, the video signal to be displayed on partial screen D is transmitted to reception channel C. ', and the video signal that should be displayed on partial screen E is automatically added and displayed, such that the video signal that should have been displayed on partial screen D is updated with the video signal that should have been displayed on partial screen D. Ru.

Since there is no point in outputting the audio signals of the input channels displayed on the screen simultaneously or sequentially, a predetermined background sound is played from the speaker 14 in the following manner.

In other words, in multiple image display mode, CPU2
4 switches the audio signal switching unit 12 via the control signal output unit 28 so that the audio signal generation unit 29 is connected to the audio output unit 13, and also operates the audio signal generation unit 29 to switch the audio signal generation unit 29 to the audio output unit 13. 29
The audio signal synthesized by the audio signal switching unit 12
By outputting this to the speaker 14 via the audio output section 13, a predetermined background sound is played from the speaker 14.

(Effects of the Invention) As described above, according to the present invention, by switching the operation section to the multiple image display mode,
Since images of multiple channels are displayed simultaneously on the CRT screen, viewers can check the broadcast contents of multiple channels at a glance when desired, eliminating the troublesome channel operations to check the broadcast contents of multiple channels. It is convenient because you can easily select the broadcast you want to watch. In addition, since the image of the video recording and reproducing device can be displayed and checked on one screen along with the television broadcast image, the video recording and reproducing device and the television receiver can be used to switch the video signal between the video recording and reproducing device and the television receiver. It is even more convenient because you can easily select the image you want to watch from multiple images, including video playback images, without having to perform any manual operations. Furthermore, after the video signal is temporarily stored in the buffer memory, the stored contents are sequentially transferred to the display memory by the CPU, and the CRT
Since the image is displayed on the CRT screen, the image on the CRT screen is updated continuously, resulting in a smooth image.

Moreover, only the video signal of the receiving channel that is being broadcast or the video channel that is inputting the video playback signal is input to the buffer memory,
Noise from channels that are not being broadcast or video channels that are not input with a video playback signal is not written to the buffer memory and therefore not input to the display memory, so no noise screen parts are formed on the CRT screen, improving the appearance. You can get good high quality images.

In addition, since a single tuner for normal reception is used as is, it is possible to receive the same number of channels as during normal reception without having to set new reception channels for displaying multiple images. It can be displayed simultaneously, does not require a reception channel setting operation, is easy to use, has a simple configuration, and can be implemented in existing television receivers.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the entire television receiver according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a CRT screen in a multiple image display mode. 2... tuner, 6... video signal switching section, 7...
...Synchronization signal switching unit, 8...Video output unit, 9...Deflection output unit, 10...CRT, 10a...Deflection coil, 15...Tuning selection unit, 18...Buffer memory,
19...Buffer memory control unit, 21...Display memory, 22...Display memory control unit, 24...Central control unit (CPU), 27...Operation unit, 30...Input switching unit, 31...Video channel.

Claims (1)

[Claims] 1. Any one reception channel switched at a constant cycle by a single tuner and a video channel to which a video recording/playback device is connected are selected as input channels by an input switching section, and this input channel is selected as an input channel. One image of the video signal obtained from the composite video signal is stored in a buffer memory in synchronization with the synchronization signal in the composite video signal, and the display memory has a plurality of storage areas capable of storing data for one image of the video signal of each channel. , in synchronization with a television synchronization signal based on a clock pulse, the storage in the buffer memory is transferred during the vertical retrace period of the television synchronization signal, and the video signal stored in the display memory is transferred during the display scanning period of the television synchronization signal. Images from multiple channels can be read out sequentially on one screen.
A television receiver that displays on a CRT,
a tuning section that switches the receiving channel of the tuner; an input switching section that selects either the selected receiving channel or the video channel as an input channel; and an image of the video signal of the input channel selected by the input switching section. a display memory having a plurality of storage areas capable of storing one screen worth of each video signal of any one selected input channel; The buffer memory control section controls writing to the CRT, the video output section outputs the video signal to the CRT, and the deflection output section outputs the deflection control signal to the deflection coil of the CRT. A video signal switching unit and a synchronization signal switching unit that switch to the display memory side, and a display memory that generates a television synchronization signal from a clock pulse and performs writing to and reading from the display memory in synchronization with the television synchronization signal. A control unit, a central control unit that controls the operation of each of the units, and an operation unit that is operated to switch the display mode of the CRT display device between a single image display mode and a multiple image display mode, and the central control unit When the multiple image display mode is selected by the operation unit, the unit determines whether or not a composite video signal is input to the input channel based on the synchronization signal, and if not, the tuner and input switching unit 1. A television receiver, characterized in that the television receiver is configured to instruct the switching according to a predetermined program, and to write the video signal into the buffer memory when the video signal exists. 2. If the number of channels into which composite video signals are input exceeds a predetermined number, after sequentially filling in the display memory up to the last storage area, the memory in this last storage area is used to store the images of the remaining channels. Claims: By sequentially updating the CRT screen with a signal, images of each channel are sequentially displayed on partial screens obtained by dividing a CRT screen into a plurality of predetermined screens, and images of the remaining channels are sequentially displayed on the final partial screen. The television receiver according to item 1. 3 The video of the reception channel that has finished broadcasting will be automatically deleted, the video of the newly opened reception channel will be automatically added, and the video of all the reception channels and video channels that are being broadcast will be displayed on one screen. 2. A television receiver according to claim 1, wherein the television receiver is configured to display: