JPH0715680A - Television receiver - Google Patents

Abstract

PURPOSE:To display the pictures of a test pattern and a landscape, etc., with high resolution by providing a ROM for storing picture data for at least one field, reading the picture data stored in the ROM and displaying the pictures. CONSTITUTION:The picture data of the ROM 1a storing the picture data which are the composite video signals of the landscape or the like for a first field and a second field are inputted to a digital/analog converter (D/A converter) 5a. Then, when a selector 2a is changeover controlled by a CPU 11 and the common terminal 2a3 is selected at an another side switching terminal 2a2, the composite video signals outputted from the D/A converter 5a and synchronizing signals outputted from a synchronizing signal generation circuit 8 are inputted to a video signal processing circuit 9 and signal processed, the signal processed video signals are supplied to a CRT 10 and the pictures by the composite video signals which are the picture data stored in the ROM 1a, for instance the still pictures of the test pattern and the landscape, etc., can be displayed at the screen of the CRT 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver for receiving a television broadcast and displaying an image.

[0002]

2. Description of the Related Art In a television receiver, it is possible to display a character such as a numeral of a channel selected for an image displayed on a screen by receiving a television and a sign indicating a high or low volume. There is something I did. FIG. 8 is a block diagram showing a main configuration of a conventional television receiver of this type. The television signal of the television broadcast received by the antenna 14 is input to the tuner 13. The video signal selected by the tuner 13 and output from the tuner 13 is given to the one-side switching terminal 16a of the selector 16. Image data, which is a video signal reproduced by, for example, a video tape regarder (not shown), which is input to the recording / playback device connection terminal 15, is supplied to the other side switching terminal 16b of the selector 16. Selector 16
The video signal from the common terminal 16c of is input to the video adding circuit 18.

The video addition circuit 18 receives a video signal from the character generator 17 which stores character data such as a bar graph showing the number and volume of the selected channel to be displayed in the display image. Is entered. Then, the selector 16 and the character generator 17 are
It is controlled by. The video signal added with the character data output from the video adding circuit 18 is input to the video signal processing circuit 9. The video signal output from the video signal processing circuit 9 is applied to a CRT (cathode ray tube) 10.

Next, the operation of this television receiver will be described. When the CPU 11 controls switching of the selector 16 to select the video signal from the tuner 13 and controls the reading of the character data of the character generator 17, the video addition circuit 18 outputs the video signal of the television broadcast from the character generator 17. The read character data is added. Then, the video signal to which the character data is added is given to the CRT 10 via the video signal processing circuit 9, and the character of the character data is displayed on the screen of the CRT 10 in the image displayed by the video signal of the television broadcast. .

When the video signal reproduced by the video tape recorder is selected by switching the selector 16, the video signal reproduced by the selected video tape recorder is input to the video adding circuit 18 and reproduced. Character data is added to. Then, the video signal to which the character data is added is transmitted via the video signal processing circuit 9.
Given to CRT 10. As a result, the character of the character data is displayed on the screen of the CRT 10 in the image displayed by the video signal reproduced by the video tape recorder.

[0006]

As described above, the conventional television receiver uses the character data stored in the character generator to display the number of the selected channel and the code indicating the volume of the channel. Display the character. Therefore, in addition to such characters, it is possible to display an image such as a test pattern or landscape when not displaying an image reproduced by, for example, a television broadcast or a recording / reproducing device. However, such an image is displayed. There is a problem that it cannot be realized by simply storing the image data in the character generator. The present invention has been made in view of the above problems, and an object of the present invention is to provide a television receiver capable of displaying an image such as a test pattern and a landscape with high resolution.

[0007]

A television receiver according to the present invention comprises a ROM for storing at least one field of image data, and reads the image data stored in the ROM to display an image. To

[0008]

The predetermined image data for at least one field is stored in the ROM in advance. The image data stored in the ROM is read and the image based on the read image data is displayed on the screen. As a result, it is possible to display on the screen an image with high resolution other than the screen based on the television broadcast and the reproduced image data.

[0009]

The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a block diagram showing a main configuration of a television receiver according to the present invention. The television signal of the television broadcast received by the antenna 14 is input to the tuner 13. The video signal selected by the tuner 13 and output from the tuner 13 is given to the one-side switching terminal 16a of the selector 16. Not shown, for example, a video tape recorder connected to the recording / playing machine connection terminal 15
The video signal input to 15 is the switching terminal on the other side of selector 16.
Given to 16b. The video signal selected by the common terminal 16c that the selector 16 selectively selects the one side switching terminal 16a and the other side switching terminal 16b is input to the video adding circuit 18.
Character data stored in the character generator 17 for displaying a character such as a number of a channel selected and a bar graph showing the volume of the channel is displayed.

The video signal added with the character data output from the video adding circuit 18 is a selector for image switching.
It is given to one side switching terminal 2a ₁ of 2a. On the other hand, image data, which is a composite video signal such as a test pattern and a landscape, is stored for the first field and the second field.
The image data of ROM 1a is input to a digital / analog converter (hereinafter referred to as D / A converter) 5a. The analog composite video signal that has been digital-to-analog converted (hereinafter referred to as D / A conversion) by the D / A converter 5a is the other side switching terminal 2a of the selector 2a.
Given to ₂ . The video signal selected by the common terminal 2a ₃ that selectively selects the one-side switching terminal 2a ₁ and the other-side switching terminal 2a ₂ of the selector 2a is input to the video signal processing circuit 9, and the video signal processing circuit 9 The processed video signal is CR
Given to T 10. The selector 16, the selector 2a and the character generator 17 are controlled by the CPU 11.

Next, the operation of this television receiver will be described. Selector 16 is switched by CPU 11 and common terminal
For example, when the one side switching terminal 16a is selected in 16c, the video signal of the television broadcast is input to the video adding circuit 18. In addition, the character generator 17
When the control is performed, character data for displaying a character such as a character or a symbol is read from the character generator 17 and input to the video addition circuit 18. As a result, the video addition circuit 18 adds character data to the video signal of the television broadcast.

Then, the video signal to which the character data is added is given to the one side switching terminal 2a _{1 of the} selector 2a. When the common terminal 2a ₃ of the selector 2a selects the one-side switching terminal 2a ₁ under the control of the CPU 11, the video signal added with the character data is input to the video signal processing circuit 9 and processed. The video signal is given to the CRT 10. As a result, the image of the television broadcast is displayed on the screen of the CRT 10, and the character based on the character data is displayed on a part of the display image.

When the common terminal 16c of the selector 16 selects the other side switching terminal 16b and the video signal which is the image data reproduced by the video tape recorder is given to the recording / playback device connection terminal 15, In the video addition circuit, a character generator is applied to the video signal that is the reproduced image data.
The character data read from 17 is added. Thereby, the image based on the reproduced image data is displayed on the screen of the CRT 10, and the character based on the character data can be displayed on the displayed image.

By the way, the clock generated by the clock generation circuit 6 is the data control circuit 7 and the synchronization signal generation circuit 8.
The data control circuit 7 counts the clock and RO
A read address for reading image data from M 1a and a control clock for the D / A converter 5a are generated. Thereby ROM 1a
From, image data which is a composite video signal for the first field and the second field is read in two vertical periods,
The read image data is D / A converted by the D / A converter 5a. Then, the converted analog composite video signal is given to the other side switching terminal 2a ₂ of the selector 2a. Sync signal generation circuit 8
_Counts the input clock and generates a vertical synchronizing signal V _SYC , a horizontal synchronizing signal H _SYC and a composite synchronizing signal C _SYC . These generated synchronizing signals are given to the other side switching terminal 2a _{2 of the} selector 2a together with the composite video signal outputted from the D / A converter 5a.

When the CPU 11 controls the selector 2a to switch so that the common terminal 2a ₃ is selected by the other side switching terminal 2a ₂ , the composite video signal output from the D / A converter 5a , The sync signal output from the sync signal generation circuit 8 is input to the video signal processing circuit 9 and signal-processed, and the signal-processed video signal is given to the CRT 10, and the screen of the CRT 10 is stored in the ROM 1a. It is possible to display an image by the composite video signal which is the stored image data, for example, a still image such as a test pattern or a landscape.

Therefore, when the image of the television broadcast or the image of the image data reproduced by the video tape recorder is not displayed on the screen of the CRT 10, a test pattern is displayed on the screen to adjust the function of the television receiver. Checks and demonstrations of functions can be performed. In addition, when receiving a St. Giga broadcast that broadcasts only audio by broadcasting satellites, a high-resolution still image such as a landscape can be displayed on the screen.

FIG. 2 is a block diagram showing a main configuration of a second embodiment of the television receiver according to the present invention. The non-signal detection circuit 19 for detecting the absence of the video signal from the video addition circuit 18 is provided.
The selector 2a for image switching is switch-controlled by a detection signal output from 19. That is, when the detection signal is output from the no-signal detection circuit 19, the common terminal 2a ₃ of the selector 2a selects the other side switching terminal 2a ₂ . The other configuration is the same as the configuration of the main part of the television receiver shown in FIG. 1, and the same components are designated by the same reference numerals. In this way, when the video signal is not output from the video adding circuit 18, the selector 2a
A high-resolution image based on the image data stored in the ROM 1a under the switching control can be displayed on the screen of the CRT 10.

FIG. 3 is a block diagram showing the configuration of a third embodiment of the television receiver according to the present invention. Stores the first field of image data, which is a composite video signal
The ROM 1a and the ROM 1b storing the second field portion of the image data which is the composite video signal are provided. ROM 1a
The composite video signal, which is the image data of (ROM 1b), is the selector switching terminal 2b for ROM switching 2b ₁ (switching terminal 2 on the other side).
b ₂ ). Composite video signal and a 3D luminance signal / color signal of the composite video signals selected by the common terminal 2b ₃ to select alternatively one side switching terminal 2b ₁ and the other side switching terminal 2b ₂ of the selector 2b and the selector 2b A signal from a separation circuit (hereinafter referred to as a three-dimensional Y / C separation circuit) 12 is given to a one-side switching terminal 2c ₁ of a selector 2c for selectively selecting. A signal from the three-dimensional Y / C separation circuit 12 is given to the other side switching terminal 2c ₂ of the selector 2c. The composite video signal selected by the common terminal 2c ₃ is input to the buffer memory 3 for time compression for compensating the read speed from the ROMs 1a, 1b.

The buffer memory 3 includes the memory of the three-dimensional Y / C separation circuit 12 in the video signal processing circuit 9 and the ROMs 1a and 1b.
It is also used as a memory for storing the image data read from. The image data read from the buffer memory 3 is 3
It is input to the dimension Y / C separation circuit 12 and the D / A converter 5a. D / A
The analog composite video signal output from the converter 5a is given to the other side switching terminal 2a ₂ of the selector 2a. The read address and control clock output from the data control circuit 7 are given to the ROMs 1a, 1b, the D / A converter 5a, the selector 2b and the buffer memory 3. The selector 2c is controlled by the CPU 11. The rest of the configuration is the same as that of the television receiver shown in FIG. 1, and the same components are designated by the same reference numerals.

Next, the operation of this television receiver will be described. The operation of displaying a character on the image displayed by the video signal of the television broadcast and the image data reproduced by the video tape recorder by switching the selectors 16 and 2a by the CPU 11 is the same as the operation of the television receiver in FIG. It is the same.

When the clock generated by the clock generation circuit 6 is input to the data control circuit 7 and the synchronization signal generation circuit 8, the data control circuit 7 counts the clocks,
Read address and D / A for reading image data from ROM1a, 1b
It outputs the control clock of the converter 5a and controls the selector 2b and the buffer memory 3. Sync signal generation circuit 8
_Counts clocks to generate a vertical synchronizing signal V _SYC , a horizontal synchronizing signal H _SYC and a composite synchronizing signal C _SYC . Then, these synchronizing signals are given to the other side switching terminal 2a _{2 of the} selector 2a together with the composite video signal D / A converted by the D / A converter 5a. As a result, the image data which is the composite video signal for the first field is read from the ROM 1a in two vertical periods,
Image data, which is a composite video signal for the second field, is read in two vertical periods from 1b.

The selector 2b alternately selects the image data of the first field and the image data of the second field read from the ROMs 1a and 1b every two vertical periods to select the selector 2c.
Apply to the one side switching terminal 2c ₁ . The selector 2c is controlled by the CPU 11, and selects either the composite video signal from the selector 2b or the signal from the three-dimensional Y / C separation circuit 12 according to the operation mode of the television receiver to select the buffer memory 3 To enter. That is, when displaying an image based on image data reproduced by a television broadcast or a video tape recorder, the common terminal 2c _{3 is used} to switch the other side switching terminal 2c ₂
The signal applied to the buffer memory 3 is selected and input to the buffer memory 3 to operate the buffer memory 3 as the buffer memory of the three-dimensional Y / C separation circuit 12. When the composite video signal supplied from the selector 2b is selected and input to the buffer memory 3, the buffer memory 3 outputs the image data which is the composite video signal for the first field and the second field input from the selector 2c. The image data is stored in four vertical periods, and at the time of reading, the stored image data for the first field and the stored image data for the second field is time-compressed and read in two vertical periods.

The image data which is the read composite video signal is
Input to D / A converter 5a and convert D / A. The converted analog composite video signal is the other side switching terminal 2a _{2 of the} selector 2a.
Given to. This selector 2a is controlled by the CPU 11, and if the common terminal 2a ₃ selects the composite video signal from the D / A converter 5a given to the other side switching terminal 2a ₂ , the composite The video signal is input to the video signal processing circuit 9 and signal-processed, and a still image based on the composite video signal, which is the image data stored in the ROMs 1a and 1b, can be displayed on the screen of the CRT 10 with high resolution.

Therefore, when the selector 2a does not select the video signal from the video adding circuit 18, the three-dimensional Y / C
The image data of the buffer memory 3 in which the image data read from the ROMs 1a and 1b is stored can be read at high speed without operating the separation circuit 12. That is, since the buffer memory 3 can supplement the speed of reading from the ROM 1a, 1b, the resolution of the still image displayed on the screen can be increased. Then, when the image data that is a composite video signal such as a test pattern or a landscape is stored in the ROMs 1a and 1b and the image of the image data reproduced by the television broadcast and the video tape recorder is not displayed, the above-mentioned is performed. The function of the television receiver can be adjusted by the still image displayed in the same manner as. In addition, a still image such as a landscape can be displayed at the time of receiving the Send Giga broadcast.

FIG. 4 is a block diagram showing a main structure of a fourth embodiment of the television receiver according to the present invention. ROM 1a storing the first field portion and the second field portion of the image data which is the primary color red color signal R, and the first field portion and the second field portion of the image data which is the primary color green color signal G ROM 1b that stores the color signal B of the primary color blue
And a ROM 1c for storing the first field portion and the second field portion of the image data. ROM 1a (1
color signal R (G, B) which is image data read from (b, 1c)
Is input to the D / A converter 5a (5b, 5c). D / A converter 5a
Analog color signals R, G, B that have been D / A converted in (5b, 5c)
Is given to the other side switching terminal 2a ₂ of the selector 2a. The read address and control clock output from the data control circuit 7 are given to the ROMs 1a, 1b, 1c and the D / A converters 5a, 5b, 5c. The rest of the configuration is the same as that of the television receiver shown in FIG. 1, and the same components are designated by the same reference numerals.

Next, the operation of this television receiver will be described. The operation of switching the selectors 16 and 2a by the CPU 11 to display a character on the image displayed by the video signal of the television broadcast and the image data reproduced by the video tape recorder is the same as the operation of the television receiver in FIG. It is the same.

By the way, a clock is generated by the clock generation circuit 6, and the data control circuit 7 and the synchronization signal generation circuit 8 are generated.
Then, the data control circuit 7 counts the clock and outputs a read address for reading the image data from the ROMs 1a, 1b, 1c and a control clock for controlling the D / A converters 5a, 5b, 5c. Further, the synchronizing signal generating circuit 8 counts clocks and generates a vertical synchronizing signal V _SYC , a horizontal synchronizing signal H _SYC and a composite synchronizing signal C _SYC . As a result, the image data as the color signals for the first field and the second field are read from the ROMs 1a, 1b, 1c in the two vertical periods.

Image data which is the color signal R (color signal G, color signal B) read from the ROM 1a (1b, 1c) is input to the D / A converter 5a (5b, 5c) and D / A converted. The converted and converted analog color signals R, G, B are on the other side switching terminals of the selector 2a.
Given to 2a ₂ . Here, the selector is controlled by the CPU 11.
When 2a selects the color signals from D / A converters 5a, 5b, 5c, the image data of the color signals R, G, B read from the ROMs 1a, 1b, 1c causes the CRT 10 screen to be displayed. As described above, a high resolution still image can be displayed.

FIG. 5 is a block diagram showing the essential structure of a fifth embodiment of the television receiver according to the present invention. ROM 1a that stores the first field portion and the second field portion of the image data, which is a luminance signal, and the color difference signals RY, B-
Multiple color difference signal C in which image data of Y is time-division multiplexed
A ROM 1b for storing the first field portion and the second field portion of the image data of -Y is provided. ROM 1a
The image data read from is input to the D / A converter 5a,
The image data which is the multiple color difference signal CY read from M 1b is input to the demultiplexer circuit 4 which separates the image data which is the color difference signals RY and BY. The image data that is the color difference signal RY separated by the demultiplexer circuit 4 is sent to the D / A converter 5b, and the image data that is the color difference signal BY is sent to the D / A converter 5b.
Input to D / A converter 5c. The analog color difference signals output from the D / A converters 5a, 5b, 5c are given to the other side switching terminal 2a ₂ of the selector 2a.

Read addresses and control clocks output from the data control circuit 7 are ROMs 1a, 1b, D / A converter 5
a, 5b, 5c are given to the demultiplexer circuit 4. The other configuration is the same as that of the television receiver shown in FIG. 4, and the same components are designated by the same reference numerals.

Next, the operation of this television receiver will be described. The operation of switching the selector 2a by the CPU 11 to display a character on the image displayed by the video signal of the television broadcast and the image data reproduced by the video tape recorder is the same as that described above with reference to FIG.
By the way, when the clock generated by the clock generation circuit 6 is applied to the data control circuit 7 and the synchronization signal generation circuit 8, the data control circuit 7 counts the clocks, and the ROMs 1a, 1b
Read address to read image data from D / A converter 5
A control clock for controlling a, 5b, 5c and a clock for controlling the demultiplexer circuit 4 are generated to generate the ROM 1a, 1b, D / A.
It controls the converters 5a, 5b, 5c and the demultiplexer circuit 4. The sync signal generation circuit 8 counts clocks to generate a vertical sync signal V _SYC , a horizontal sync signal H _SYC, and a composite sync signal C.
Generate _SYC .

As a result, the image data as the luminance signal and the image data as the multiple color difference signal for the first field and the second field are read from the ROMs 1a, 1b in two vertical periods. Then, the image data read from ROM 1a is converted into a D / A converter.
Input to 5a and convert D / A. The image data which is the multiple color difference signal C-Y read from the ROM 1b is input to the demultiplexer circuit 4, and the demultiplexer circuit 4 converts the input multiple color difference signal image data C-Y into the color difference signal R-Y. Separated into BY and input to D / A converters 5b and 5c separately. Then, the analog luminance signal Y is output from the D / A converter 5a, the analog color difference signal RY is output from the D / A converter 5b, and the analog color difference signal BY is output from the D / A converter 5c. Output each.

The luminance signal Y and the color difference signals RY and BY output in this way are output to the other side switching terminal 2a _{2 of the} selector 2a.
Given to. As a result, the common terminal 2a ₃ is switched to the other side switching terminal.
If the luminance signal and the color difference signal given to 2a ₂ are selected, the luminance signal Y, the color difference signals RY and B are displayed on the screen of the CRT 10.
An image based on the image data of -Y can be displayed.

FIG. 6 is a block diagram showing the essential structure of a sixth embodiment of the television receiver according to the present invention. Stores the first field of image data that is a composite video signal
A ROM 1a and a ROM 1b for storing a second field portion of image data which is a composite video signal are provided. Composite video signal which is image data of the first field of read from ROM 1a is provided to one side switching terminal 2b ₁ of the selector 2b. ROM
The composite video signal which is the image data for the second field read from 1b is given to the other side switching terminal 2b ₂ of the selector 2b. Selector 2b one side switching terminal 2b ₁ and other side switching terminal 2b
_The composite video signal selected by the common terminal 2b ₃ from the composite video signal given to ₂ is input to the buffer memory 3 for time compression for compensating the reading speed from the ROMs 1a and 1b.
The composite video signal which is the image data read from the buffer memory 3 is input to the D / A converter 5a, and the D / A converted analog composite video signal is output to the other side switching terminal 2a _{2 of the} selector 2a.
Given to.

The read address and control clock output from the data control circuit 7 are applied to the ROMs 1a, 1b, the selector 2b, the buffer memory 3 and the D / A converter 5a. The other configuration is the same as the configuration of the television receiver shown in FIG. 1, and the same components are designated by the same reference numerals.

Next, the operation of this television receiver will be described. The operation of displaying a character in the image displayed by the video signal of the television broadcast and the image data reproduced by the video tape recorder by switching control of the selector 2a by the CPU 11 is the same as the operation of the television receiver in FIG. Is. By the way, when the clock generated by the clock generation circuit 6 is input to the data control circuit 7 and the synchronization signal generation circuit 8, the data control circuit 7 counts the clocks and the image data which is a composite video signal from the ROMs 1a, 1b. Read address is output and the selector
2b, a buffer memory 3, and a control clock for controlling the D / A converter 5a are output. The synchronizing signal generation circuit 8 counts clocks and outputs a vertical synchronizing signal V _SYC , a horizontal synchronizing signal H _SYC and a composite synchronizing signal C _SYC . Thus, the image data which is the composite video signal for the first field is read from the ROM 1a in the two vertical periods, and the image data which is the composite video signal for the second field is read from the ROM 1b in the two vertical periods.

The selector 2b is provided with the composite video signal which is the image data for the first field read from the ROM 1a and the ROM 1b.
The composite video signal, which is the image data of the second field read from, is alternately selected every two vertical periods. Then, the selected composite video signal is input to the buffer memory 3.
The buffer memory 3 stores the image data which is the composite video signal for the first field and the second field in four vertical periods, and at the time of reading, the time of the image data for the first field and the second field stored. It is compressed and read in two vertical periods. When the read image data is input to the D / A converter 5a, the D / A converter 5a performs D / A conversion, and the converted analog composite video signal is output to the other side switching terminal 2a of the selector 2a.
Given to ₂ . Here, when the selector 2a selects the composite video signal from the D / A converter 5a, the high-resolution still image based on the image data which is the composite video signal stored in the ROMs 1a and 1b is described above. Similarly, it can be displayed on the screen of CRT 10.

FIG. 7 is a block diagram showing a main configuration of a seventh embodiment of the television receiver according to the present invention. ROM 1a for storing first and second fields of image data which is a luminance signal, and first and second fields of image data which is a carrier color signal
ROM 1b and is provided. The luminance signal of the image data read from the ROM 1a is input to the D / A converter 5a, and the carrier color signal which is the image data read from the ROM 1b is input to the D / A converter 5b.
The luminance signal and the carrier color signal output from the D / A converters 5a and 5b are given to the other side switching terminal 2a ₂ of the selector 2a. The read address and the control clock output from the data control circuit 7 are given to the ROMs 1a, 1b and the D / A converters 5a, 5b. The rest of the configuration is the same as that of the television receiver shown in FIG. 1, and the same components are designated by the same reference numerals.

Next, the operation of this television receiver will be described. The operation of displaying the character on the image displayed by the video signal of the television broadcast and the image data reproduced by the video tape recorder by switching the selector 2a by the CPU 11 is the same as the operation of the television receiver in FIG. By the way, when a clock is output from the clock generation circuit 6, the clock is input to the data control circuit 7 and the synchronization signal generation circuit 8. As a result, the data control circuit 7 counts clocks and generates and outputs read addresses for reading image data from the ROMs 1a, 1b and control clocks for controlling the D / A converters 5a, 5b. The synchronization signal generation circuit 8 counts clocks and outputs a vertical synchronization signal V _SYC , a horizontal synchronization signal H _SYC and a composite synchronization signal C _SYC .

Then, the image data which is the luminance signal and the carrier color signal for the first field and the second field is read from the ROMs 1a and 1b in two vertical periods. The luminance signal, which is the image data read from ROM 1a, is input to the D / A converter 5a, and the carrier color signal, which is the image data read from ROM 1b, is input to the D / A converter 5b, which is D / A converted and converted into analog signals. The luminance signal and the carrier color signal of ₂ are given to the other side switching terminal 2a ₂ of the selector 2a. Here, when the selector 2a selects the luminance signal and the carrier color signal from the D / A converters 5a and 5b, the high-resolution still image based on the luminance signal and the carrier color signal, which are image data, is the same as described above. Can be displayed on the CRT 10 screen.

In this way, the television receiver according to the present invention can display the image of the television broadcast and the image of the reproduced image data on the screen, and if the images are not displayed, the high quality image is displayed. It is possible to display a still image with a predetermined resolution. Therefore, for example, a still image can be displayed while adjusting and demonstrating the function of a television receiver and receiving a St. Giga broadcast. Although the video tape recorder is connected to the recording / playback device connection terminal 15 in the above-described embodiment, the present invention is not limited to this. Further, in the present embodiment, the still image to be displayed is the test pattern and the landscape, but it is needless to say that the same effect can be obtained even if a still image other than the above is displayed.

[0042]

As described in detail above, according to the present invention, it is possible to display an image of image data prestored in the ROM in high resolution in place of the image of the television broadcast and the image of the reproduced image data. it can. Therefore, by storing image data such as test patterns and landscapes in the ROM, the test patterns can be displayed to easily adjust and check the functions of the television receiver and demonstrate the functions. In addition, when receiving the Sent Giga broadcast of only audio by the broadcasting satellite, it is possible to provide a television receiver capable of displaying a high-resolution still image on the screen.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a first embodiment of a television receiver according to the present invention.

FIG. 2 is a block diagram showing a main configuration of a second embodiment of the television receiver according to the present invention.

FIG. 3 is a block diagram showing a main configuration of a third embodiment of a television receiver according to the present invention.

FIG. 4 is a block diagram showing a main configuration of a fourth embodiment of a television receiver according to the present invention.

FIG. 5 is a block diagram showing a main configuration of a fifth embodiment of a television receiver according to the present invention.

FIG. 6 is a block diagram showing a main configuration of a sixth embodiment of a television receiver according to the present invention.

FIG. 7 is a block diagram showing a main configuration of a seventh embodiment of a television receiver according to the present invention.

FIG. 8 is a block diagram showing a main configuration of a conventional television receiver.

[Explanation of symbols]

 1a, 1b, 1c ROM 2a, 2b, 2c Selector 3 Buffer memory 4 Demultiplexer circuit 5a, 5b, 5c Digital / analog converter 6 Clock generation circuit 7 Data control circuit 8 Sync signal generation circuit 9 Video signal processing circuit 10 CRT 11 CPU 12 3D Y / C separation circuit

Claims (7)

[Claims] 1. A television receiver for receiving a television broadcast and displaying an image, comprising a ROM for storing at least one field of image data, and displaying an image of the image data stored in the ROM. A television receiver characterized by being constructed. 2. A circuit provided with a circuit for detecting that the television broadcast is not in a receiving state, and when the circuit detects that the circuit is not in the receiving state, the image of the image data stored in the ROM is displayed. The television receiver according to claim 1, wherein 3. A three-dimensional Y / C separation circuit is provided, and the three-dimensional Y / C separation circuit is provided.
2. The television according to claim 1, wherein the memory of the three-dimensional Y / C separation circuit is configured to be used as a buffer memory for compensating the reading speed from the ROM when the C separation circuit is in a non-operating state. John receiver. 4. The television receiver according to claim 1, wherein the ROM stores image data which is a primary color signal. 5. The television receiver according to claim 1, wherein the ROM stores image data which is a luminance signal and a color difference signal. 6. The television receiver according to claim 1, 2 or 3, wherein the ROM stores image data which is a composite video signal. 7. A television receiver characterized in that the ROM stores image data which is a luminance signal and a carrier color signal.