JPS62108680A - Television receiver - Google Patents

Abstract

PURPOSE:To receive and display plurla television images with one device by providing a circuit part which performs the process of an ordinary television image, a circuit part which performs a specific image process, such as a multi- mode, and a character broadcasting signal processing part. CONSTITUTION:An ordinary television broadcasting signal inputted from an antenna 1 is received at a main body circuit part I, then being displayed on a CRT13. A specific image processing curcuit part II other than the main body circuit part I is provided, and at the part, the program of each broadcasting station or the image from external video equipment is divided into small pictures and is displayed simultaneously on the CRT13, or a specific image display, such as a two-screens mode, a stroboscopic mode, etc., can be performed. Furthermore, by connecting a character broadcasting signal processing part III as shown in figure, the process of a multiplexed television signal on which a character broadcasting signal is overlapped can be performed, enabling one television system to display plural television images.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a television receiver, and in particular, it is capable of transmitting television images from multiple broadcast stations or images from external video equipment such as a video tape recorder. Make it a small screen 1
The present invention relates to a television receiver configured to be able to simultaneously display on two television screens, and further configured to receive a teletext signal superimposed on a multiplexed television signal and display it on the screen.

(Prior art) In current television broadcasting, the number of television broadcasting stations that can be received in one area is approximately nine, but the programs of each of these television broadcasting stations are displayed on one television screen. In other words, if it were possible to set up multi-mode, viewers would be able to know all the TV broadcast numbers in the area at once, and instantly select the program they want to watch, which would be extremely useful. It is convenient for

However, in order to display multiple television images in multi-mode on a single television screen using a conventional television receiver, it is necessary to install an additional tuner to accommodate the number of television images, which increases the number of television images. It is difficult to adopt this method because it increases the size of the receiver and increases the manufacturing cost.

On the other hand, a teletext service that superimposes a teletext signal on the television signal from each broadcasting station and broadcasts the teletext signal will be launched in the near future, but it is unlikely to become popular. Having a receiver is a big burden both economically and in terms of installation space.

(Object of the Invention) The present invention has been made in view of the actual situation as stated in "-", and its purpose is to reduce the size of the device and the manufacturing cost as much as possible, and to To develop and provide a television receiver that has both the function of displaying images on one television screen and the function of receiving and displaying teletext signals in one device, and to make more effective use of the teletext service. Every effort is made to make it possible.

(Structure of the Invention) In order to achieve such an L1 objective, the present invention includes a main circuit section that processes normal television images, a special image processing circuit section that performs special image processing such as multi-mode, It includes a teletext signal processing section that processes a multiplexed television signal on which a teletext signal is superimposed, and the main circuit section includes a tuner, a channel selection control section, and its channel selection control η1.
a video amplifying section that amplifies and outputs a video signal selected by the tuner and outputted from the tuner;
and a video output section, and the special image processing circuit section selectively introduces the video signal output from the video amplification section or the video signal from an external video device input through the external input terminal. an input selector switch,
4.1 A sofa memory for storing one image of the video signal from the video amplification section or the external input terminal, a display memory for storing one image of the video signal of each of the images, and an image to the buffer memory. It has a buffer memory control section that controls writing of signals, and a display memory control section that controls writing from the buffer memory to the display memory and reading from the display memory, and displays a television screen in multi-mode. Sometimes, the tuner is switched at regular intervals by the channel selection control section, and the video amplification section sequentially outputs the video signal of each broadcast channel from the tuner, and the video signal of the video amplification section and the video signal of the video amplification section that are sequentially output. Storing one image of each video signal from an external video device in the buffer memory, transferring the video signal stored in the buffer memory to the display memory, and reading the video signal from the display memory to output the video. is configured to output to the CRT via a
When displaying the television screen in screen mode, 1
Image data of one broadcasting channel is stored in the buffer memory in units of one display horizontal scan, and in the next horizontal scan period, the contents of the buffer memory are transferred to the display memory, and this storage and transfer is performed during the display scan period. The teletext signal processing unit is configured to display a small-screen moving image in a normal television image by reading it from the display memory during a display period of the same JLL SIGN-J, and the teletext signal processing unit By extracting the teletext signal from the multiplexed television signal -υ on which the signal is superimposed, sequentially storing it in a data memory, reading out the data stored in the data memory, converting it into a display output, and applying it to the CRT, It is configured to be able to display the contents of the teletext signal on the CRT, and when displaying the television screen on the multi-mode, the contents of instructions such as the presence or absence of the received teletext signal and the broadcast format are displayed. , is configured to be displayed on each split screen in correspondence with each channel, and when displaying the television screen in the two-screen mode, instruction contents such as the presence or absence of the teletext signal, broadcast format, etc. The present invention provides a television receiver, characterized in that it is configured to display the following on each of the parent and child screens on its two sides.

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

FIG. 1 is a block diagram showing an overall schematic circuit configuration of a television receiver according to an embodiment of the present invention.

Broadly speaking, this television receiver can display television images on the entire television screen in a normal state.
The main circuit part I is configured to process images so as to be displayed on the RT, and the program of each television broadcasting station and images from external video equipment are displayed on multiple small screens simultaneously on the television screen. In addition to processing images so that they can be displayed in multiple modes, there is also a special image processing circuit section configured to be able to perform various special image processing such as dual screen mode and strobe mode; It consists of a teletext signal processing section (2), etc., which is configured to process a multiplexed television signal on which a teletext signal is superimposed.

In this embodiment, multiple small screens are simultaneously displayed on one television screen based on television signals from multiple television broadcasting stations or video signals from external video equipment such as a video tape recorder. This is called a multi-mode, and it also includes a normal-sized television image (so-called front number! The case where a small screen television image (so-called sub-program) is simultaneously displayed on a small screen (this is called a sub-screen) is called 2-screen mode, and furthermore,
The case in which a plurality of television images are displayed on one television screen in a 17 feed based on television signals from a plurality of television broadcasting stations is referred to as strobe mode.

In the main circuit section I, 14; l: television antenna; 2: tuner; 3: channel selection control section; 4: video amplification section;
5 is an audio signal processing section, G is a video signal processing section, 7 is a synchronization signal processing section, 8 is an audio output section, 9 is a video output section, ] 0 is a deflection output section, 11 is a speaker, 12 is a deflection coil, 13 Since this is a CRT and its construction is similar to that of a normal television receiver, a description of its operation will be omitted except for listing the names. Note that the audio switching circuit 57 provided after the audio signal processing section 5 and the video switching circuit 58 provided after the video signal processing section 6 are both circuits related to the teletext signal processing section (2). This will be explained in detail later.

In the special image processing circuit section (2), the first manual changeover switch 14. A second manual changeover switch 15 and a video output changeover switch 16 are provided.

The first manual changeover switch 14 has three individual contacts a.
1, bl, and cl, and in multi mode, 2 bl and cl of these individual contacts are selectively closed, and in 2 screen mode, 2 of the other individual contacts 2 al are closed. It has become.

The second manual changeover switch 15 has two individual contacts a.
2. b2 and iiJ moving contact c2, the movable contact c2 switches to the multimode 1' (17, 1 separate contact b2 side), and the 2-stroke musician -F switches to the individual contact a.
Switching to the 2nd side □L.

The video output changeover switch 16 similarly has two individual contacts a3. b3 and a movable contact c3, the movable contact c3 switches and moves to the individual contact white 3 side during normal television picture, and switches and moves to the individual contact b3 side when in multi mode and 2 screen mode. It is supposed to be done.

(1) Multimode Next, transfer the multimode television image to the CRT1.
3 will be described in more detail.

That is, in the first manual changeover switch 14, one of the individual contacts bl and cl is first closed, the movable contact c2 of the second manual changeover switch 15 is switched to the individual contact b2 side, and the video output changeover switch 16 is switched to the individual contact b2 side. The movable contact c3 is switched to the individual contact b3 side. Therefore,
A video signal from the video amplification section 4 of the main circuit section (2) is given to the web video processing section 20 via the individual contact b1 of the first manual changeover switch 14.

By the way, in this multi-mode, the tuner 2 is operated so that the tuning control unit 3 switches one after another at a constant cycle, so synchronization disturbance occurs when switching between channels 1 and 2. However, this synchronization disturbance can be prevented from occurring. In order to
9 is provided. The composite synchronization signal from the composite synchronization signal generation circuit 19 is given to the synchronization signal processing unit 7 via the individual contact b2 and the movable contact C2 of the second manual changeover switch 15, and the synchronization signal processing unit 7 The signal is processed and output to the deflection output section 10, thereby preventing synchronization disturbance.

The sub-image processing section 20 processes the applied image signal and extracts a luminance signal (Y) and a color difference signal (R) from this image signal.
-Y, BY) and the same 1υ1 signal for writing are generated. The synchronization signal from the sub-video processing section 20 is given to the buffer memory control section 2I as a horizontal synchronization signal SH and a vertical synchronization signal S■. The buffer memory control unit 2
1 outputs a switching signal that controls the operation timing of each circuit section based on a given synchronization signal.

The luminance signal (Y) and the color difference signal (RY, T3-Y) from the sub video processing section 20, C11, and multiplexer 22
The switching output from the multiplexer 22 is subjected to Δ/D conversion in the A/D conversion circuit 23, and then temporarily stored (written) in the buffer memory 24. In such a case, the buffer memory control unit 21, as shown in FIG.
'A write clock is outputted between the scanning lines IUI (write lines) so that the switching output from the multimode bus 22 is written into the buffer memory 24. The multiplexer 22 also outputs a luminance signal (Y
) and color difference signals (R-Y, r3-Y) as Yl, R1-Y, Y2 . Bl-Y, Y3. R2~Y,
. . . The output is switched sequentially.

In this case, in order to display nine images on one television screen, the amount of image data in the vertical direction is reduced to 1/3, and in the horizontal direction, the read clock is tripled than the write clock. There is.

Thus, data for one image is stored in the buffer memory 24. When the image data has been stored in the buffer memory 24, the central control unit 28, whose operation is defined by the program ROM 29 and the workpiece 30, stores the image data from the buffer memory 24 into the display memory 26 during the vertical retrace period. Transfer.

In this manner, when the transfer of data for one image is completed, the tuner 2 is switched and set to display the video signal from the next television broadcasting station. This setting is repeated eight times, and when the storage and transfer of each image data from the eight television broadcasting stations is completed, the movable contact C1 changes from the individual contact bl of the first manual changeover switch ]4 to the movable contact C1.
Then, a video signal from an external video device introduced through the external input terminal 31 is input to the sub video amplifying section 20. Regarding the video signal from this external video device, as well as the TV and vision signals from the television broadcasting station,
Each image is digitized and stored in the buffer memory 24 -1-, and then transferred to the display memory 26.

In this way, each image data transferred to and stored in the display memory 26 is then read out by the display memory control section 25, and then D/A converted by the l)/A conversion circuit section 27, and converted into an image. The image is outputted to the video output section 9 via the output changeover switch 16 and displayed on the television screen -1- of the CRT 13.

Now, on the television screen, as shown in FIG. 7(a), television images A, +3. C. Old: I+ and images from external video equipment will be displayed.

(■) 2-sided mode Next, transfer the television image of the 2-screen child-1' to the CRT.
13 will be described in more detail.

In this case, the individual contact a1 of the first manual changeover switch 14 is closed, and the movable contact c2 of the second manual changeover switch 15 is switched to the individual contact a side. Further, the movable contact c3 of the video output changeover switch 16 is switched to the individual contact b3 side when displaying a small image, and to the individual contact a side when displaying a normal size television image.

First, the video signal processed by the small screen tuner 32 and the video amplification circuit 33 is transferred to the first manual changeover switch 14.
The video signal is supplied to the sub-video processing section 2o via the sub-video processing section 2o. Further, a video signal for a normal television image is outputted from the video amplifying section 4 to the main circuit section (2) via the individual contact a2 of the second manual changeover switch 15 and the movable contact c2.

A signal is given.

From the video signal given to the sub video processing section 20,
Similarly to the case (1) above, a luminance signal (Y) and a color difference signal (RY) are extracted from the video signal.

+3-Y) and a synchronization signal for writing are generated, the synchronization signal is given to the buffer memory control section 21, and the luminance signal (Y) and color difference signals (R-Y, B-Y) are given to the multiplexer 22. As shown in FIG.
During one horizontal scanning line period, each image data of Y) is
R1-Y, Y2゜BIY, Y3. R2-Y,...
・Switch and output in sequence.

The switching output from the multi-break→J22 is A/D converted by the A/D conversion circuit 23, and then transferred to the buffer memory 24.
The data is stored in a part (the shaded part) as shown in FIG. This writing to the buffer memory 24 is performed as described in (i) above.
The same is true for . Further, the transfer of each image data from the buffer memory 24 to the display memory 2G is performed within one horizontal scanning line period once every horizontal scanning line period following the writing line, as shown in FIG. Then, as shown in FIG. 6, this is performed on a part of the display memory 26 (the shaded part). This transfer is controlled by the buffer memory control section 21. Each image data thus transferred to the display memory 26 is read out by the display memory control section 25.

This readout is performed during the high level periods of readout A and readout B, as shown in FIG. Furthermore, during the period when readout A or readout B is at a high level, the movable contact C3 of the video signal changeover switch 16 is connected to the individual contact b3.
During the period when the movable contact C3 is at a low level, the movable contact C3 is switched to the individual contact a3 side. Further, the position where each readout A or readout B becomes high level corresponds to the position on the television screen of the small screen moving image shown by the solid line or broken line in FIG. 7(b).

In this case, read H corresponds to horizontal synchronization signal SH. Therefore, the position of this small screen moving image is
Alternatively, it can be changed by controlling the high level position of read B. In this way, each small screen moving image data outputted from the display memory 26 is D/A converted by the D/A conversion circuit section 27, and then outputted to the video output section 9 via the video output changeover switch 16. This allows C
A small-screen moving image is displayed on the television screen of RT13.

FIG. 9 is a block diagram showing the circuit configuration of the teletext signal processing section (2), which utilizes the vertical blanking period of television video No. 14 to
Receive an encoded teletext signal transmitted by a data packet whose unit length is between - horizontal scanning amount,
It is configured to be able to reproduce and display text and simple graphic information included in the teletext signal on a CRT, and as shown in the figure, the tuner 2 in the main body circuit section I
9 Tuning control section 3. A waveform equalization data extracting circuit 34 that introduces the output of the receiving section consisting of the video amplification section 4, etc., a framing detection and identification circuit 35, and a clock pulse generation circuit 3.
6, a direct conversion/error correction circuit 37, a synchronization signal generation circuit 38, a capture buffer 39, a display clock generation circuit 40, a display memory 41, a matrix circuit 42, a display controller 43, and an audio decoder 44.
, a main CPU 48, a program ROM 47 for the main CPU 48, a work RAM 4G for the main CPU 4B, a data memory 45 for storing required data of the extracted character number transmission code, and a data memory 45 for the 8-bit data memory 45. Timing control circuit 49 and sub CP
Program R'0M for U50 and its sub CPU50
51, a work RAM 52 for the sub CPU 50, a kanji ROM 53, an interface circuit 54, a remote control receiver/keyboard 55, and a printer 56.

The detailed operation of the teletext signal processing section 5 will be explained as follows.

First, the television signal obtained from the receiving section 2.3.4 in the main circuit section I is supplied to the waveform equalization data extracting circuit 34, which slices it to an appropriate level and shapes the waveform. and the teletext signal is extracted. The extracted teletext signal is converted from a serial signal to a parallel signal in a direct conversion/error correction circuit 37, and after errors are corrected, it is temporarily stored in a capture buffer 39. At this time, since it is necessary to synchronize the teletext signal with the orthogonal conversion in the orthogonal conversion/error correction circuit 37, the clock pulse generation circuit 36 and the framing detection and identification circuit 35 are used to synchronize the teletext signal in revisoto units and byte units. is taken.

The teletext signal stored in the capture buffer 39 is judged by the main CPU 48 for framing detection errors, error correction errors, etc., and the presence or absence of data identification codes and reservations, and only the necessary data is transferred and stored in the data memory 45. be done.

On the other hand, the sub CPU 50 decodes the data (character code) taken in by the main CPU 48 and performs drawing processing and audio reproduction processing.

Regarding the drawing process, the sub CI) U 50 extracts the kanji RO from the character code stored in the data memory 45.
The address in M53 is calculated, and each character pattern and its display address are sequentially transferred to the display controller 43, whereby the display controller 43 sets the character pattern in the display memory 41. At this time, in order to synchronize with the television image, synchronization is achieved by the display clock generation circuit 40 and the synchronization signal generation circuit 38, and the signal is output via the matrix circuit 42 to the video switching circuit in the main circuit section I on the 5th day. be done. Therefore, if the video switching circuit 58 is switched to the teletext receiving side, the desired character pattern will be displayed on the CRT 13 via the video output section 9. Note that the video switching circuit 5
Reference numeral 8 is for switching between the television video signal obtained by the video signal processing section 6 in the main circuit section (■) and the video signal obtained by the teletext signal processing section (■), and is indicated by ■ in the figure. , the output lines from the video signal processing section 6 and the matrix circuit 42 are respectively inputted.

Regarding audio reproduction processing, the audio data is output to the audio decoder 44, converted into audio (melody sound) by the audio decoder 44, and output to the audio switching circuit 57 in the main circuit section I. Therefore, the audio switching circuit 5
7 is switched to the teletext receiving side, the reproduced audio is output from the speaker 11 via the audio output section 8.

The audio switching circuit 57 is for switching between the audio signal obtained by the audio signal processing section 5 in the main circuit section I and the audio signal obtained from the teletext signal processing section (2). As shown in the middle ■, output lines from the audio signal processing section 5 and the audio decoder 44 are respectively input.

Note that switching of access to the data memory 45 between the main CPU 4B and the sub CPtJ 50 is performed by a timing control circuit 49.

This teletext signal processing unit 1■ interface circuit 54 is connected to the interface circuit 60 provided in the special image processing circuit section 2, as shown by ■ in the figure, so that it receives the teletext signal. In this case, the data of the teletext signal is transferred to the special image processing circuit section (2) via the interface circuit 60, and therefore, the teletext signal data is transferred to the special image processing circuit section (2) through the interface circuit 60, and the teletext signal is then transmitted to the special image processing circuit section (2) through the interface circuit 60. Therefore, as shown in FIG. When displaying the screen, the presence or absence of the teletext signal.

The contents of instructions such as the broadcast format are displayed on each split screen corresponding to each channel, and when displaying the television screen in the two-screen mode as shown in FIG. 7(b), Instructions such as presence or absence of a teletext signal, broadcast format, etc. are displayed on each of the two parent and child screens.

(Effects of the Invention) As is clear from the above detailed description, according to the television receiver of the present invention, when displaying a plurality of images in multi-mode, the tuner is switched at a constant cycle by the tuning control section. The video amplification section sequentially outputs the video signals of each broadcast channel from the tuner, stores one image of each of the sequentially output video signals in a buffer memory, and stores the video signals stored in the buffer memory. The video signal is transferred to the display memory, and the video signal is read from the display memory and output to the CRT via the video output section.When displaying the television screen in the two-screen mode, one broadcast channel The image data is stored in a buffer memory in units of one display horizontal scan, and in the next horizontal scan period, the storage contents of the buffer memory are transferred to the display memory, and this storage and transfer is repeated during the display scan period. The small-screen moving image is read out from the display memory during the display period and displayed in the normal television image.
Although it has only one tuner, it can display multiple television images on a single television screen, and it can also display multiple television images on a single television screen. The teletext signal is extracted and sequentially stored in a data memory, and the data stored in the data memory is read out and converted to display output for display on a CRT.
By giving the contents of the teletext signal to the CRT
By installing a teletext signal processing unit capable of displaying a teletext signal in 11 minutes by effectively utilizing the main body circuitry, it is possible to provide a function that can support teletext services in 11 minutes. , when displaying the television screen in the multi-mode, the reception of the received teletext signal is
It is advantageous if the instructions such as the broadcast format are displayed on each split screen corresponding to each channel.+iii. According to the present invention, the teletext service can be used more effectively and conveniently by configuring the instruction content such as the broadcast format to be displayed on both the parent and child screens of the two screens. It does not increase the size of the device or increase manufacturing costs, and it also has the function of displaying multiple television images on one television screen and the function of receiving and displaying teletext signals. This has resulted in the excellent effect of being able to provide a very convenient television receiver that can promote more effective use of services.

[Brief explanation of drawings]

The drawings show an embodiment of the television receiver according to the present invention, FIG. 1 is a 2V circuit diagram showing the overall schematic circuit configuration, FIG. 2 is a write transfer timing chart in two-screen mode, and FIG. The figure shows the multiplexer output timing chart in multi mode and dual screen mode.
Figure 4 is a write timing chart in multi mode, Figure 5 is a 4M configuration diagram of the buffer memory, Figure i is a configuration diagram of the display memory, Figure 7 (a) L:I', 'l
Figure 7 (1)] is a front view of the CR7 screen in 22-screen mode, Figure 8 is a readout timing chart in 2-screen mode, and Figure 9 FIG. 2 is a block circuit diagram showing a detailed circuit configuration of a teletext signal processing section. ■・・・・・・Body circuit part, ■・・・Special image processing four-way part, ■・・・
......Teletext signal processing section, 2...
・Tuner, 3...Tuition selection control unit, 4...Video amplification unit, 9...Video output unit, 13=... ...CRT. 14......First input selector switch, 1
5......Second manual changeover switch, 21
......Buffer memory control section, 24...
・・・・・・Buffer memory, 25・・・・・・・・・
Display memory control unit, 2G...Display memory, 31...External input terminal, 45...
・・・・・・Data memory.

Claims (1)

[Claims] A main body circuit portion that processes ordinary television images;
A special image processing circuit section that performs special image processing such as multi-mode, and a teletext signal processing section that processes a multiplexed television signal on which a teletext signal is superimposed, and the main circuit section includes a tuner; It has a tuning control section, a video amplification section that amplifies and outputs a video signal selected by the tuning control section and output from the tuner, a CRT, and a video output section to the CRT, The special image processing circuit section includes an input changeover switch that selectively introduces a video signal output from the video amplification section or a video signal from an external video device inputted through an external input terminal, and A buffer memory that stores one image of the video signal from the input terminal, a display memory that stores one image of the video signal of each of the images, and a buffer memory control unit that controls writing of the video signal to the buffer memory. and a display memory control unit that controls writing from the buffer memory to the display memory and reading from the display memory, and when displaying a television screen in multi-mode,
The tuner is switched at regular intervals by the channel selection control section, and the video amplification section sequentially outputs the video signal of each broadcast channel from the tuner, and the video signal of the video amplification section and external video that are sequentially output. storing one image of the video signal of the device in the buffer memory, transferring the video signal stored in the buffer memory to the display memory, and reading out the video signal from the display memory to output the video signal; When displaying a television screen in a two-screen mode, the image data of one broadcast channel is stored in the buffer memory in units of one display horizontal scan, and the next horizontal During the scanning period, the storage contents of the buffer memory are transferred to the display memory, and this storage and transfer are repeated during the display scanning period, and the contents are read from the display memory during the display period of the synchronization signal, and the contents are read out from the display memory during the display period of the synchronization signal to display the contents of the normal television image. The teletext signal processing unit extracts the teletext signal from the multiplexed television signal on which the teletext signal is superimposed, sequentially stores the teletext signal in a data memory, and By reading the data stored in the data memory, converting it into a display output, and providing it to the CRT, the contents of the teletext signal can be transferred to the CRT.
When displaying the television screen in the multi-mode, instructions such as the presence or absence of the received teletext signal and the broadcasting format are displayed on each split screen corresponding to each channel. and when displaying the television screen in the two-screen mode, instructions such as presence or absence of the teletext signal, broadcast format, etc. are displayed on each parent and child screen of the two screens. A television receiver characterized by: