JPH01218277A - Teletext receiver - Google Patents

Abstract

PURPOSE:To eliminate the flicker of a picture and to obtain the picture easy to watch by setting color display at a specific color arrangement when the plural pictures are displayed. CONSTITUTION:When an operating part 4 issues a command to display the plural pictures, a teletext decoder 3 writes different character display signals in the areas of a display RAM 37, reads character display signals from the displaying RAM 37 at a prescribed timing, and applies them to a reception display part 7. The plural pictures are displayed on a display part 5 of the reception display part 7. At such a time, the teletext decoder 3 ignores the color designating signals of the character displaying signals, and applies designated chrominance signals written in a color designating register R in a displaying control part 38. Thus, the designated color easy to watch is displayed on the display part 5 of the reception display part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a teletext receiver, and particularly to a teletext receiver that displays screens in easy-to-see colors when displaying multiple screens at a time.

[Conventional technology]

Conventional teletext receivers of this type are broadly divided into a reception display section that displays a video signal obtained by receiving television waves, and a teletext decoder that obtains a text signal based on the signal from the reception display section. and an operation section for channel selection, selection of one screen or multiple screens, and other operation controls, and receives the television radio waves of the channel set by the operation section in the reception display section, and displays the TV screen. A teletext decoder extracts the teletext data superimposed on the video signal obtained from the signal and stores it in a memory. A character display signal is formed from the accumulated teletext signal and stored in the display memory. The display signal is read out and mixed with the video signal or switched with the video signal and displayed on the reception display section.

Further, the teletext receiver is configured such that its operation is controlled according to instructions given via the operation section. Furthermore, the teletext decoder is configured to be able to display two screens. In other words, the teletext decoder has a display memory for two screens and can be divided into two parts. Separate character display signals are written to this display memory, and character display signals are read from this display memory at a predetermined timing. The configuration is such that two screens can be displayed by feeding the received information to the reception display section.

According to such a teletext receiver, normal television broadcasting can be received by operating the reception display section in accordance with the contents commanded via the operation section. Further, by operating the reception display section and the teletext decoder according to the contents commanded through the teletext reception 11 operation section, the text signal can be displayed on the reception display section. Of course, if you give a command for two-sided display via the operation unit, the teletext decoder will work to write separate character display signals to each display memory, and from this written display memory at a predetermined timing. By reading out the character display signal, two sides are displayed on the reception display section.

[Problem to be solved by the invention]

By the way, the conventional teletext receiver described above has the problem that when it is set to a two-sided display using the operation panel, the screen itself oscillates and flickers due to the interlaced display in the case of the NTSC system, making it very difficult to see. Ta.

The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide a teletext receiver that eliminates flickering even when displaying multiple screens and has an easy-to-read screen.

[Means to solve the problem]

As a result of various studies to solve the above-mentioned drawbacks, the inventor of the present invention found that
They discovered that a very easy-to-read screen could be provided with a specific color arrangement, and invented the following.

That is, the teletext receiver according to the present invention that achieves the above object is a teletext receiver that can display either one screen or multiple screens each time it is displayed, and selectively receives predetermined television radio waves and converts them into video signals. a reception display unit that converts the video signal and mixes and switches the video signal with a character display signal that is input separately and displays the result; an operation section for controlling selection and other controls, extracting the teletext data superimposed on the video signal from the reception display section, storing the teletext data in a memory, and reading out the data from this memory. and a teletext decoder that forms a character display signal based on the character display signal, writes it to a display memory, and outputs a character display signal read from the display memory, and the teletext decoder includes a register for specifying a color of the character display signal. and set a predetermined easy-to-see color specification signal in this color specification register, and when displaying multiple screens, ignore the color specification in the character display signal and use the color specified in the color specification set in the register. It has means for displaying.

[Effect]

The present invention having such a configuration has the following effects.

That is, predetermined television radio waves are selectively received on the reception display section. The received predetermined television radio waves are converted into video signals in the reception display section. The video signal from the reception display section is given to a teletext decoder. The teletext decoder extracts the teletext data superimposed on the video signal and stores the extracted teletext data in a memory. The data read from this memory is converted into a character display signal by a teletext decoder and written into the display memory.

The character display signal from the teletext decoder is mixed and switched with the video signal of the reception display section and displayed.

Further, when a command to display multiple screens is issued from the operation unit, the teletext decoder writes separate character display signals to multiple areas of the display memory, and converts the character display signals from the display memory to a predetermined number. It is read out at the timing of and given to the reception display section. As a result, a plurality of screens are displayed on the display section of the reception display section. At this time, the teletext decoder ignores the color designation signal of the character display signal and provides the designated color signal written in the color designation register to the reception display section. As a result, the designated easy-to-see color is displayed on the display section of the reception display section, so that both sides of the display do not flicker, making it possible to provide an easy-to-see screen.

According to the present invention having such a configuration, almost no flickering is visible even when multiple screens are displayed.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a teletext receiver according to the present invention. FIG. 2 is an explanatory diagram showing the configuration of the display control section of the same embodiment, and FIG. 3 is an explanatory diagram shown for explaining the operation written in the display memory of the same embodiment during the two-sided operation.

The embodiment shown in the figure is constructed as follows.

That is, the circuit is configured such that the television radio waves induced by the antenna l are taken into the selective amplification circuit section 2. This selective amplification circuit section 2 is equipped with a tuner 20, an intermediate amplification circuit 21, and a frequency characteristic correction circuit 22. Radio waves from the antenna 1 are input into the tuner 20, and predetermined television radio waves are selectively received and video signals are generated. The intermediate amplifier circuit 21 amplifies and outputs the amplified video signal, and outputs the amplified video signal to the teletext decoder 3 via the frequency characteristic correction circuit 22. The circuit is configured as follows.

The selection amplification circuit section 2 has a circuit configured such that a command to select a predetermined television radio wave is given from the operation section 4. 'Furthermore, the operation section 4 can perform on/off control of the power supply and other controls. This operation section 4 includes a remote control device 40. The teletext decoder 3 extracts the teletext data superimposed on the video signal supplied from the selection amplification circuit section 2, and can store the extracted teletext data in a random access memory (RAM) 30. The structure is such that a character signal is generated based on the data read from the data, and the details will be described later. The teletext decoder 3 is supplied with control signals from an operating section 4, and is configured to control the operation of each section based on commands from the operating section 4.

The character signal from the teletext decoder 3 is taken into the display section 5, where it is mixed or switched with the video signal from the selection amplification circuit section 2 and displayed on the display 50. It is composed of Here, reference numeral 6 denotes a power supply circuit section, and when a power switch section (not shown) is turned on, this power supply circuit section 6 is connected to each of the above-mentioned components (selective amplification circuit section 2, teletext decoder 3, operation section 4, The circuit is configured to be able to supply power to the display section 5). Further, the power supply circuit section 6 is connected to the operation section 4.
The circuit configuration is such that power can be supplied to the selective amplification circuit section 2 and the teletext decoder 3 even when the power switch section is turned off. The power supply circuit section 6 is configured such that its power switch section is switch-controlled via the teletext decoder 3 based on commands from the operation section 4.

The operating section 4 is configured to set a channel to the selective amplifying circuit section 2 so that the selective amplifying circuit section 2 can receive desired television radio waves when the power switch section is turned off. The power supply circuit section 6 has a circuit configuration capable of supplying power to the selective amplification circuit section 2 and the teletext decoder 3 even when the power switch section is turned off by the operation section 4; The broadcast decoder 3 is
The configuration is such that text broadcast data in the received television radio waves can be stored in the RAM 30 when the power is turned off.

Moreover, the teletext decoder 3 is a central processing unit (CPU)
31, RAM 30 for control/data storage, and CPU
31, a read-only memory (ROM) 32 that stores programs for operating the 31, and a non-volatile memory 3 for storing screen reservations, etc.
3, and a data extraction/error correction circuit 3 that extracts data from the video signal from the selective amplification circuit section 2 and corrects errors.
4, a reception control synchronization generation circuit 35 that forms a synchronization signal from the video signal from the selection amplification circuit section 2, a character generator 36 that generates a character pattern including Chinese characters, and a RAM 30.
It converts the data read from the 2-sided display into a character signal and writes it to the display memory 37 as shown in FIG. a display control unit 38 that displays a color based on a color designation signal written into a color designation register R shown in FIG. 2;
An input/output device 39 that drives the power supply circuit section 6 and other external devices and takes in signals from other external devices, a system bus BUS that connects these, and a character signal from the display control section 38 into analog signals. It is configured to include a digital-to-analog conversion circuit DAC.

The operation unit 4 includes a remote control device y140,
It consists of an operation panel 45 provided with operation switches, etc., and predetermined parts are operated by signals from the operation panel 45, and the remote control device 4
A predetermined portion is also operated by 0. The remote control device 40 includes a light receiving device 41
, a remote control CPU 42 that forms a control signal according to a signal from this light receiving device 41, and this remote control CPLI4.
2, and a remote control transmitter 44.

The display section 5 includes a mixing/switching section 51 that switches between the video signal from the intermediate amplifying circuit 21 of the selective amplifying circuit section 2 and a character signal from the digital-to-analog conversion circuit DAC of the teletext decoder 3, and this mixing/switching section. a video display unit 52 that outputs a video signal based on the signal output from 51;
and a display 50 that displays signals from the video display section 52.

The selective amplification circuit section 2 and the display section 5 constitute a reception display section 7.

The operation of the embodiment configured as described above will be explained with reference to FIGS. 1 to 4.

FIG. 4 is a flowchart shown to explain the two-sided display operation of this embodiment.

First, an easy-to-read predetermined color designation signal is, for example, a signal that sets the background color to half-brightness white and the foreground color to black.
It is assumed that this is set to .

Further, the CPU 31 of the teletext decoder 3 executes the process shown in the flowchart of FIG. 4 at fixed time intervals.

When the character display signal is read from the display memory 37, it is determined whether or not the character display signal is a color designation signal (step 100).If the character display signal does not designate a color in step 100, the fourth Terminates the process without performing the process shown in the figure. On the other hand, if it is determined in step 100 that the color is specified, the process proceeds to step 101.
Then, it is determined whether or not there is a designation for two-sided display from the operation unit 4. In this step 101, if the display is not two-sided, the color designation of the character display signal is set in register R (
Step 102) Therefore, from now on, a character display signal is displayed on the display 50 using the color designation signal of this register R (specified by the character display signal).

However, if it is determined in the step 101 that the display is a two-sided display, the process proceeds to the next step 103. In this step 103, it is determined whether or not to change the color to an easier-to-see color. In step 103, if a command not to change the color to an easy-to-read color is input via the operation unit 4, the process proceeds to step 102.

Therefore, from now on, a character display signal is displayed on the display 50 using the color designation signal of this register R (specified by the character display signal).

On the other hand, in this step 103, if a command to change the color to an easily viewable one is input via the operation unit 4, the register R
The designation signal of the easy-to-see color stored in the non-volatile memory 33 will be set in the register R (step 104). ), a character display signal is displayed on the display 50. This makes the shaking of the screen much less noticeable.

〔Effect of the invention〕

As described above, according to the present invention, even if multiple screens are displayed, the screen can be seen with almost no flickering.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams shown to explain the embodiment, and Fig. 4 is a flow chart shown to explain the operation of the embodiment. It is. 3... Teletext decoder, 7... Reception display section (selective amplification circuit section 2, display section 5), 4... Operation section. Agent Patent Attorney Tomo Murakami - Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) In a teletext receiver capable of displaying either one screen or multiple screens each time a display is made, a character display signal is received which selectively receives a predetermined television radio wave, converts it into a video signal, and is input separately from this video signal. a reception display unit that mixes and switches between and displays the above, and an operation unit that gives a command to the reception display unit to select a predetermined television radio wave, and also controls selection of one screen or multiple screens and other controls; Extracting the teletext data superimposed on the video signal from the reception display section, storing the teletext data in a memory, forming a character display signal based on the data read from this memory, and storing it in the display memory. and a teletext decoder for outputting a character display signal read from the display memory, the teletext decoder having a register for specifying a color of the character display signal, and a register for specifying a predetermined color for easy viewing. It is characterized by having a means for setting a signal and displaying a color according to the color specification set in the register, ignoring the color specification in the character display signal when displaying multiple screens. Teletext receiver. (2) A signal that sets the background color to half-brightness white and the foreground color to black is set in the color designation register of the teletext decoder as a predetermined easy-to-see color designation signal. Teletext receiver described in section.