CN1040717C - Apparatus for outputting the latest information in received teletext - Google Patents

Abstract

A device for outputting the latest information, in which only the latest information is received in the received teletext when the content of the information from the transmitter changes irregularly. In a system having such a function for receiving teletext, during reception of teletext, previously received information is compared with new information, and if new information is entered, it is displayed on the monitor, and if not Input new information, that is, the latest information is the same as the previous information, and the reception mode becomes the TV mode or the video tape recorder mode, so the latest information and the image of the color TV set or the video tape recorder can be watched alternately and effectively.

Description

Apparatus for outputting the latest information in received teletext

The present invention relates to a device for outputting the latest information in received teletext, wherein during the reception of teletext or any related information, if new information is entered, only the latest information is provided and not included in the previous teletext display on the screen Original message in text broadcast.

In general, in today's era of rapid information change, imaging equipment with built-in devices for receiving teletext or related information therein, such as color televisions or video tape recorders, enables people to Sites have easy access to the latest changing information. In this device, if desired information is desired to be seen on the display portion of the receiving side, the entire page containing the desired information is displayed again.

That is to say, for the conventional imaging device for receiving teletext, the transmitting end transmits the information generated from time to time as the latest information by changing the information irregularly, wherein when it is desired to see some new information on the display portion of the receiving end When information is displayed, the page containing the corresponding information is completely displayed. Therefore, there is a problem that, since the previous content of the unchanged information should be looked over again, the required latest information is not easy to see.

In U.S. Patent No. 4,991,017 entitled "Television and Teletext Signal Receiver with Decoder and Adaptive Latency Reduction Circuitry", a method for storing the page number in the page number memory by looking up the page number and then assigning it to the memory The technology of assigning priority to the page number and reducing the waiting time. In this prior art, if the capacity of the memory is full, the oldest page number priority is erased from the memory so that the latest page number remains in the memory.

However, even in the above structure, when the user wishes to see a message, all the messages stored in the page memory are displayed. As a result, in a case where the memory capacity is large enough to hold all the information, one cannot easily see only the desired new information since the user has to see the previously unchanged information again.

It is an object of the present invention to provide an apparatus for outputting the latest information in received teletext, wherein, during reception of teletext, previously received information is compared with newly received information, and when the new information is When it is input, it will be displayed on the monitor, and if no new information is input, the receiving mode will be changed to TV mode or VCR mode, so that the latest information and images output from color TV or VCR can be selected and watch effectively.

In order to achieve the above object, there is provided a device for outputting the latest information in teletext broadcasting received in a video tape recorder or a color TV set with a decoder for processing text information, wherein the analog signal of the text information Separate only from a composite video signal received from an external source to be displayed on a monitor, the apparatus includes: analog-to-digital conversion means for converting the analogue text information supplied from said decoder for processing text information The signal is converted into a digital signal; a plurality of information storage devices are used to respectively store the first data representing the previous data and the second data indicating the data currently provided, and output the first and second data according to a predetermined control signal; the comparison device, For comparing the first data and the second data to determine whether they are identical to each other, each data is respectively provided from the information storage means; control signal generating means for converting one of the compared parallel data in the comparison means into serial data, then integrate and amplify the serial data, and limit it at a predetermined DC current level to output the first control signal; the digital/analog conversion device is used in the first control signal generating device When the control signal represents the difference between the first data and the second data, only the latest information data stored in the second memory is converted into an analog signal; the control means is used to generate a signal for controlling the decoder once a predetermined key signal is received, The signal for controlling the information storage device, the signal for controlling the latest information time, the execution signal and the text information ON/OFF (ON/OFF) signal; addressable means for the first control signal in said first control signal generating means Indicates that when the first data and the second data are the same, sequentially increment the address signal of the information storage device; the first logical combination device is used to logically combine the first control signal of the first control signal generating device and the The execution signal of the control means controls the first switch to selectively provide the output of said digital/analog conversion means and the output of text information or TV/video; the second logic combination means is used to combine said first logic by logic Combining the transformed output of the means and the text information ON/OFF signal of the control means controls the second switch to selectively provide text information or TV/video signals to one end of the first switch.

These and other objects, features and advantages of the present invention will be more clearly seen in the description of the preferred embodiment below in conjunction with the accompanying drawings, in the accompanying drawings:

1 is a schematic block diagram of an apparatus for outputting latest information in teletext received according to the present invention;

Referring to Fig. 1, this figure shows a device for outputting and receiving the latest information of teletext, a decoder 1 for processing text information is connected to an analog signal for converting the text information generated from decoder 1 into An analog-to-digital converter 9 for digital signals, where only the analog signal is separated from the composite video signal received from an external source to be displayed on the monitor.

The memory selector 11 is connected to an output terminal of the analog/digital converter 9 . By pressing the predetermined control signal For M1/M2 operation, the memory selector 11 selectively supplies the digitally converted signal to each of the first memory 12 and the second memory 13 connected to the rear end of the memory selector.

The first memory 12 typically stores and outputs the desired digitized signal. The first memory 12 outputs first data corresponding to previous information, and the second memory 13 outputs second data corresponding to currently input information.

One input of the comparator 16 is connected via the first buffer 14 to an output of the first memory 12 , while the other input of the comparator 16 is connected via the second buffer 15 to an output of the second memory 13 .

The comparator 16 includes an exclusive OR gate which compares the first data of the previous information supplied from the first memory 12 and the second data of the current information supplied from the second memory 13 so that if they are different, the exclusive OR gate Output a high level signal.

A parallel/serial converter 17 for converting the compared parallel data signal into a serial data signal is connected to the output of the comparator 16, and an integrator 18 for integrating the serial data is connected to the parallel/serial output of converter 17. An amplification and clipping unit 19 for amplifying the integrated signal and outputting it by clipping to a fixed DC level is connected to the output of the integrator 18 .

The digital/analog converter 20 is connected to the output end of the second buffer 15, and under the situation that the first data is different from the second data, the digital/analog converter only The latest information data stored in the second memory is converted into an analog signal.

A control circuit receives predetermined key signal, control signal M1/M2, latest information time control signal, address signal, execution signal and text information on/off signal TTX ON/ Generates a signal to control Decoder 1 when OFF. The control circuit includes a microprocessor 3 for outputting the above-mentioned different control signals by inputting an external key signal; a third memory 10 for storing the retrieval time of the latest information; by operating under the control of the microprocessor , the third switch 7 turned on during the latest information retrieval period;

Incremental device 22 is connected on an output end of the microprocessor 3 of control circuit, under the situation that first data and second data are identical to each other, this incremental device provides according to the first control signal that amplifies and limiting unit 19, through The sequentially increasing address signals generated by the microprocessor 3 successively identify the identity of the first data and the second data.

The first and second memories 12 and 13 are connected to an output of incrementing means 22 for generating altered addresses.

One input end is connected to the output end of amplifying and limiting part 19 and the other input end is connected to the AND gate 6 of the execution signal EXT end of microprocessor 3 when looking for the newest information logic combination first control signal and execution signal, and control The first switch 5 selectively switches between the output terminal of the D/A converter 20 and the output terminal of the TV/video, so as to display text information or video signals on the monitor.

One input terminal is connected to the output terminal of AND gate 6 through an inverter 23 and the other input terminal is connected to the on/off signal terminal TTX ON/ The logical combination of the AND gate 4 of OFF and the output of the AND gate 6 and the on/off signal TTX ON/ OFF, and control to selectively output TV/video signal or text information TTX to one end of the second switch 2 .

The first and second switches 5 and 2 controlled by the AND gates 6 and 4 are operated, and when the current information is the same as the previous information, a TV or video signal is output, and if they are different, the AND gates 6 and 4 are operated to select the number /analog converter 20 output.

The above operation of the apparatus for outputting the latest information in received teletext according to the present invention will be described in detail below.

First, in selecting a mode for receiving text information, the text information ON-key is pressed by the user using a key input part (not shown). Afterwards, the microprocessor 3 makes the text information on/off signal TTX ON/ OFF becomes high level. Therefore, a high-level signal is input to one input terminal of the AND gate 4 .

An output signal of the AND gate 6 is added to the other input terminal of the AND gate 4. In this regard, if the execution key is not pressed, the output EXT of the microprocessor 3 becomes low level, so the output of the AND gate 6 also becomes low. is a low level, the low level is then applied to the other input end of the AND gate 4 as a high level through the inverter 23, and the AND gate 4 outputs a high level signal to switch the second switch 2 to the terminal 'h'. Since the output of the AND gate 6 is low, the first switch 5 is switched to the terminal '1'.

Similarly, when the second switch 2 is switched to the terminal 'h' and the first switch is switched to the terminal 'l', the composite video signal provided in the decoder 1 is decoded and passed through the terminal of the second switch 2 'h' and terminal 'l' of the first switch 5 are displayed on a monitor (not shown) so that the user can watch teletext.

Second, upon selecting the memory teletext mode, the user presses a key (not shown) located on the key input section for starting and ending the latest information. Afterwards, the microprocessor 3 outputs a high-level signal for the latest information reception time via the control terminal 'A', and generates a signal for operating the third switch 7 via the control terminal 'B' at the same time.

The third switch 7 is switched to terminal 'h' and the fourth switch 8 is turned on by the signal passing through the third switch 7 . At this time, the latest information reception time data is stored in the third memory 10 .

When the third memory 10 is turned on, the composite analog signal as text information separated from the decoder 1 is input to the A/D converter 9 via the fourth switch 8, and then converted into a digital signal. In the microprocessor 3, from the memory selector 11, the first and second memories 12 and 13, the control terminal 'C' of the microprocessor 3 generates a low-level control signal M1/M2, at this time, the memory selector 11 is switched to provide the first memory 12 with digitized data. Once the first memory 12 receives the control signal M1/M2 provided by the microprocessor 3, it starts to operate. In this case, if the control signal M1/M2 is a low-level signal, which is supplied to the first memory 12 as a write signal W/R. Accordingly, the digital signal output from the A/D converter 9 via the memory selector 11 is written into the first memory 12 .

The first and second switches 5 and 2 maintain the same states as in the first explanation above, so that text information can be displayed on the monitor.

Third, in a mode for selecting to compare the identity of previous information and current information, the user presses an execute key (not shown) in the key input part. Afterwards, the microprocessor 3 makes the execution control signal EXT become a high level, and this signal is provided to an input terminal of the AND gate 6, and the microprocessor 3 makes the text information ON/OFF signal TTX ON/OFF simultaneously. OFF becomes low level, and the signal is supplied to an input terminal of AND gate 4.

Afterwards, the AND gate 4 outputs a low level signal, so that the second switch 2 is switched to the terminal '1'. At this time, the first switch 5 is switched to the terminal 'l' or 'h' to select the signal passing through the second switch 2 or an output of the D/A converter 20 according to the output level of the AND gate 6.

In this mode, a high-level control signal is generated on the control terminal 'C' of the microprocessor 3 M1/M2, therefore, the memory selector 11 is switched to supply one output of the A/D converter 9 to the second memory 13 . At the same time, the first memory 12 passes the control signal M1/M2 are operated as read mode. Therefore, the first memory 12 reads the previous data and supplies it to the comparator 16 via the first buffer 14 . At the same time, the second memory 13 supplies the digital signal provided by the memory selector 12 , that is, the latest information, to the comparator 16 via the second buffer 15 .

The comparator 16 including an exclusive OR gate outputs a low-level signal if the signals supplied from the first and second buffers 14 and 15 are identical to each other, and generates a high-level signal if they are different.

For example, when the output data of the first memory 12 is "10110011" and the output data of the second memory 13 is "01101000", one output of the comparator 16 is "11011011". In this regard, "1" indicates that the latest information exists, and "0" indicates that the latest information does not exist.

The parallel data supplied from the comparator 16 is converted into serial data by a parallel/serial converter 17 and integrated in an integrator 18 . At this time, if the output of the comparator 16 is all "0", the output of the integrator 18 becomes low level, and if the output of the comparator 16 changes from high level to low level or vice versa, it has a predetermined The form of the analog waveform.

Amplifying and limiting unit 19 amplifies the output of integrator 18 and limits this output at a constant DC voltage, only when the contents of the first and second memory stores 12 and 13 are different from each other, amplifying and limiting unit 19 just outputs a high voltage flat signal.

If the output of amplifying and limiting unit 19 is a high level, the allowable end EN of the second buffer 15 becomes a high level, so that only the latest information temporarily stored in the second buffer 15 is input to the digital/analog converter 20 and output as an analog signal.

The high-level signal generated by the amplification and limiting unit 19 is applied to one input terminal of the AND gate 6 . At this time, the high-level execution signal EXT provided by the microprocessor 3 is added to the other input terminal of the AND gate 6, so that the output signal of the AND gate 6 becomes a high level, and the first switch 5 switches to the terminal 'h' . Therefore, in the D/A converter 20, the analog signal of the latest information is converted and displayed on the monitor through the terminal 'h' of the first switch 5.

However, if the contents in the first and second memories 12 and 13 are identical to each other, the output of the comparator 16 becomes low level. The second buffer 15 is disabled by the amplification and limiting unit 19 so that the signal output from the digital/analog converter 20 is present. At the same time, the output of the AND gate 6 becomes low level, so that the first switch 5 is switched to the terminal 'l'. Thus, the TV or video signal is displayed on the monitor. As a result, if the currently provided information is the same as the previous information, the user can watch the television broadcast or video signal during this period (that is, without the latest information that has changed).

As shown above, with the apparatus for outputting the latest information in received teletext according to the present invention, when new information is received, if the latest information is different from the previous information, the changed latest information can be viewed, and if they are the same , you can watch, TV broadcast or tape video signal, so that users can effectively watch teletext without being disturbed.

Claims (6)

1. A device for outputting the latest information in a teletext broadcast received in a video tape recorder or a color television set with a decoding decoder dealing with text information, wherein the analog signal of the text information is only compared with an external signal A composite video signal received by a source to be displayed on a monitor is separated, characterized by comprising: analog/digital conversion means for converting an analog signal of text information provided from said decoder for processing text information into a digital signal; a plurality of information storage devices for respectively storing first data representing previous data and second data indicating currently provided data, and outputting the first and second data according to a predetermined control signal; comparing means for comparing the first data and the second data to determine whether they are identical to each other, each data being respectively provided from the information storage means; control signal generating means for converting a compared parallel data in said comparing means into serial data, then integrating and amplifying the serial data, and limiting it at a predetermined DC current level to output the first a control signal; A digital/analog conversion device for converting only the latest information data stored in the second memory into an analog signal when the first control signal of the control signal generating device represents the difference between the first data and the second data; The control device is used to generate a signal for controlling the decoder once a predetermined key signal is received, a signal for controlling the information storage device, a signal for controlling the latest information time, an execution signal and a text information on/off (ON/OFF) signal; Addressable means for sequentially incrementing the address signal of the information storage means when the first control signal of the first control signal generating means indicates that the first data and the second data are the same; The first logical combination means is used to control the first switch to selectively provide the digital/analog conversion means by logically combining the first control signal of the first control signal generating means and the execution signal of the control means. output and output of text messages or television/video; Second logical combination means for controlling a second switch by logically combining the transformed output of said first logical combination means with the text information ON/OFF signal of said control means to selectively provide text message or TV/video signal to one end of the first switch. 2. The apparatus according to claim 1, wherein said information storage means comprises a first memory for storing previous information, a second memory for storing latest information, and a memory selector for setting the latest data When the key of the time interval is input to the control device, an output terminal of the analog/digital conversion device is switched to the first memory by a control signal, or at the same time for only extracting the input at the end of the required time interval When the execution key signal of the latest information of the interval is input to the control means, the output terminal of the analog/digital conversion means is connected to the second memory. 3. The apparatus according to claim 1 or 2, characterized in that said comparison means includes a first buffer for temporarily storing the output of said first memory when an update key signal is input to said control means, for updating a second buffer for temporarily storing the output of the second memory when a key signal is input to the control device, and an output for logically combining an output of the first buffer and an output of the second buffer as a digital XOR gate for signal output. 4. The apparatus according to claim 1, wherein said first control signal generating means comprises a parallel/serial converter for converting the parallel data provided from said comparing means into serial data, a for an integrator for integrating the serial data converted by the parallel/serial converter, and an amplifier for amplifying the output of the integrator and clipping it at a predetermined DC voltage and outputting it as a first control signal and limiting components. 5. The device according to claim 1, characterized in that said control means includes a microprocessor for outputting said different control signals by inputting an external key, a third memory for storing the latest information search time, a for a third switch which is turned on by operation under the control of the microprocessor during the latest information search time, and an output for inputting an output of the decoder by controlling the third switch during the latest information search time to the fourth switch of the A/D converter. 6. The apparatus according to claim 1, characterized in that said first and second switches controlled by said first and second logic combination means output TV or video signal or in latest information when the latest information is identical with previous information When the information is different from previous information, the output of said digital/analog conversion means is selected to output only the latest information.