JPH02209095A - Teletext receiver - Google Patents

Abstract

PURPOSE:To observe newest information at any time when desired to watch by devising the receiver so that a video signal being a detection output and an external video signal are controlled independently and extracting a teletext signal superimposed on a video signal of a detection output even when the external video signal is displayed. CONSTITUTION:A CPU 11 controls a 1st video signal switching circuit 5 via an output port 13 to select a signal inputted to a video signal processing section 9. A 2nd video signal switching circuit 23 is controlled similarly via the output port 13. A fixed terminal 28 and a moving terminal 227 are connected in the operation of the changeover circuit 23 by extracting a teletext signal superimposed on an external video signal 6 or 7 to apply picture processing or the like. Thus, a signal 8 inputted to a video signal processing section 9 and a signal 31 inputted to an extraction section 10 are controlled independently. Then the teletext signal superimposed on a broadcast video signal received by a tuner 1 is processed while connecting the external video signal 6 or 7 to the video signal processing section 9 and stored in a memory section 12.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention automatically detects broadcasting stations transmitting text broadcasting while watching videos, video discs, etc. of signals on which text signals are not superimposed. This relates to a teletext receiving device that automatically stores the data of the teletext signal in a pre-prepared memory while tuning into a station, thereby making it possible to always view the latest teletext broadcast content. be.

Conventional technology Typical conventional TVs with built-in teletext receivers store teletext data superimposed on the currently received channel in memory, and do not turn off the main power of the TV receiver. For example, in a standby state, a character multiplexing system can supply power to the tuner section, VIF section, detection circuit section, character signal extraction section, character signal control section, and memory section circuits and always store the latest teletext data in the memory. There is a receiver. This has the advantage that you can see the latest teletext information even if you are not watching TV.

An example of a conventional television with a built-in teletext receiver will be described below with reference to the drawings.

FIG. 2 is a block diagram of a conventional television with a built-in teletext receiver.

To explain the configuration, a television signal selected by a tuner section 1 and a channel selection section 2 is converted into a baseband video signal by a VIF section 3 and a detection circuit 4, and is inputted to a video signal switching circuit 5. On the other hand, the external video input signal 6 or 7 is input to the video signal switching circuit 5. One of the video signals 8 switched here is input to the video signal processing section 9, where the video is demodulated. On the other hand, the character signal multiplexed on the video signal 8 input to the sampling section 10 is converted from an analog signal to a parallel digital signal. The converted signal is supplied to the bus line 15, and necessary text program data is selected under the control of the CPU II and stored in the memory unit 12 connected to the bus line 15. It is processed by the processing section 18 and becomes a display image, which is displayed on the display section 19.

The video signal switching circuit 5 is switched by a control signal 14 via an output terminal 3 under the control of cputi. Further, the channel selection section 2 is similarly controlled via the bus line 15.

The block 17 surrounded by the dotted line is supplied with power by the standby power supply 16 even when the main power is turned off, and is connected to the CP in order to always store the latest teletext data in the memory unit 12.
Under the control of the UII, the extraction section lO, the memory section 12,
The output port 3, the channel selection section 2, and the video signal switching circuit 5 operate. At the same time, the tuner section 1, the VIF section 3, and the detection circuit 4 are also operating. At this time, the video signal switching circuit 5 connects the movable terminal 21 to the fixed terminal 20 and sends the video signal from the tuner 1 to the extractor 10 if there is a person in the standby state, regardless of the state before the video signal switching circuit 5 enters the standby state. Let them input.

Problems to be Solved by the Invention However, in the above configuration, when not in the standby state, all the circuits in the normal state operate, and for example, the video signal switching circuit 5 connects the external video signal 6 or 7. If set, the video signal 22 from the tuner 1 will not be input to the sampling section 10, and the data of the character multiplex signal superimposed on this video signal will not be able to be stored in the memory section 12, resulting in the latest information being missed. become.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a teletext broadcasting receiver capable of storing the latest teletext multiplex signal in a memory unit even when an external video signal is selected.

Means for Solving the Problems In order to solve the above problems, the teletext broadcasting receiving apparatus of the present invention displays the external video signal by independently controlling the video signal of the detection output and the external video signal. This makes it possible to extract the character multiplex signal superimposed on the video signal of the detection output even when the video signal is being detected.

According to the teletext broadcasting receiving device of the present invention, while watching a video input signal such as a video or a video disk unrelated to teletext broadcasting, the latest teletext data of a plurality of channels is always stored in the memory. You can always view the latest information whenever you want.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a teletext broadcasting receiving apparatus according to an embodiment of the present invention.

In FIG. 1, 1 to 22 are the same as the conventional example shown in FIG.

A second video signal switching circuit 23 is newly added, and the video signal 8 switched by the first video signal switching circuit 5 and the video signal 24 from the tuner section 1 are switched and inputted to the extraction section IO. . The input end of the video signal processing section 9 is connected to the output end of the first video signal switching circuit 5.

The operation of the teletext broadcasting receiving apparatus configured as described above will be explained with reference to FIG.

First video signal switching circuit 5 and second video signal switching circuit 2
3 (and its operation is the same as the conventional example, so it will be omitted.

CPtJll controls the first video signal switching circuit 5 via the output capacitor 13 to select a signal to be input to the video signal processing section 9. The second video signal switching circuit 23 is similarly controlled via the output port 13. The switching circuit 23 operates by extracting a character multiplex signal superimposed on the external video signal 6 or 7, and when image processing or the like is performed, the fixed terminal 28 and the movable terminal 27 are connected. However, in order to achieve this state, the user sets state B using an appropriate means, and as a result, the CPU II performs the above operation. However, usually the CPU
A fixed terminal 26 and a movable terminal 27 of the second video signal switching circuit 23 are connected through a line 25 of the output capacitor 13. By doing so, the signal 8 input to the video signal processing section 9 and the signal 31 input manually to the sampling section 10 can be independently controlled. Therefore, while connecting the external video signal 6 or 7 to the video signal processing section 9, the character multiplex signal superimposed on the broadcast video signal received by the tuner 1 can be processed and stored in the memory section 12.

Furthermore, since the CPU II can also control the channel selection section 2, it is possible to extract and process the text multiplex signal superimposed on the video signal of another channel while changing the channel at an appropriate time or according to an appropriate rule.

Effects of the Invention As described above, according to the present invention, the latest teletext data of a plurality of channels can be stored in the memory at all times while viewing a human-powered video signal unrelated to the teletext broadcast, such as a video or video disk. This has the effect of allowing you to view the latest information whenever you want.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a teletext receiver according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional teletext receiver. 1...Tuner, 2...Tuning section, 3.
...VIF section, 4...Detection circuit, 5...
...First video signal switching circuit, 6.7...
External video signal, 9...Video signal processing unit, 10
...Extraction part, 11...CPU part, 1
2... Memory section, 13... Output port section, 14... Control line, 15... Bus line, 23... Second video signal switching circuit.

Claims (1)

[Claims] a first video signal switching circuit that selects a plurality of video signals including the text multiplex signal and a broadcast video signal including the text multiplex signal; and a first video signal including the text multiplex signal selected by the first video signal switching circuit. a second video signal switching circuit that selects a broadcast video signal including a signal and a text multiplexed signal; a CPU that independently controls the first video signal switching circuit and the second video signal switching circuit; a memory section for converting a character multiplexed signal into a digital signal, a bus line consisting of a communication bus, a control bus, etc., and a channel selection section controlled by the bus line, independent of the first video signal. What is claimed is: 1. A text-multiplex broadcasting receiving apparatus, which digitally processes a text-multiplex signal of a broadcast video signal including a text-multiplex signal, stores the digitally processed text in a memory section, and is equipped with circuit means for reading out the text-multiplex signal from the memory section.