TW388179B - Teletext - Google Patents

Abstract

In order to decode full field teletext data using conventional teletext decoders which only recognise teletext data contained in lines of the vertical blanking interval, the full field data is divided into a plurality of channels each occupying no more than the number f lines in a vertical blanking interval. The data from a selected one of the channels is delayed before being applied to the decoder so that it occurs within the following vertical blanking interval.

Description

A7 B7 V. Description of the Invention (i) The present invention relates to a method and a device for transmitting and / or decoding a teletext signal. A normal teletext signal is a vertical video signal with 15 lines in each field. Hidden interval bursts. But if there is no video signal, and the channel is only for transmitting 625. The original telex data of PAL 1 TV signal, about 300 ”lines per field can be used. Therefore, normal telex text can be provided. The transmission capacity can be reduced by 20 times, and more pages can be transmitted and / or the access time per page can be reduced. The teletext translator implemented in a television receiver cannot receive full-channel teletext data. As -A normal teletext receiver expects and can only receive teletext materials in the VBI. Therefore, if a television is connected to Tu Yi to transmit the full telex cable channel, access to this information = This can be achieved by having a special telex decoder. It is not inconvenient for users and may cause a significant reduction in the audience of channels transmitting the telex in the whole field. In addition, the full field not provided by cable TV The possibility of transmitting original information such as pre-recorded data on the record carrier of a video tape may also reduce the number of user base stations. The purpose of the present invention is to enable the use of a normal teletext decoder to decode the full field teletext transmission. The present invention provides a The method of transmitting the telex text includes the following steps: a) transmitting the telex text outside vB] [during at least part of the winter, b) dividing the telex text into m independent data streams, each data The stream occupies a line 'where n is an integer, n is less than or equal to the number of lines in the VBI. The method can be particularly used in a cable television system with multiple channels, and one of the channels can be used exclusively for transmitting data. Information can be formatted as a mark (Please read the notes on the back before filling out this page) a

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-^. • -—- ^ '"f; v' ^ u η '竹 · ί 印 V A7 B7 2 V. Description of the invention (Quasi telex original text form, the dragon is not only launched during the VBI period, but also in Hao It is launched during the “moving image” period. The original telex data is divided into many individual asset streams. Each data stream occupies several lines, the number of which is less than or equal to the number of lines in the VBI. The machine receives the telex source and the resource section. It is very obvious that each data stream can contain a different number of lines. F cannot exceed η. The number of 'lines' may change, depending on the data to be transmitted. It is recorded on the record carrier. Therefore, it is possible to provide a green money such as a magnetic disk or a magnetic tape. '㈣ The magnetic disk is recorded and can be accessed by a standard television receiver and ㈣β for recording on the M video tape The original telex data can be reproduced satisfactorily. The original telex data can be recorded with multiple digits at a slower rate than the standard telex data. I am familiar with the standard VHS video recorder because of the limitation: bandwidth and cannot be satisfied To record or replay standard telex source material. The arrangement for recording and playback of the original telex by the Satoshi video recorder has been made: in the common application, the British patent is requested in the N .. Then 5614 8 (pHB3 side): In this joint application, 'revealing-arrangements' The original telex data is recorded with multiple level signals and a speed M lower than the standard telex original data rate. This recorder also includes-a circuit that can convert the received standard telex text to multiple standard codes, and The level code is converted to the standard telex original 2 and then replayed. If the pre-recorded telex material is recorded as a multi-level signal when the pre-recorded tape is played, the video green video machine original text data is converted to multi-level .This kind of love letter quasi-code encryption can be used as the standard telex original code... Requires multi-digit -5 210X 297 mm) The paper size Shizhou KK KK house standard (('NS) eight 4 Saoge A7 B7 V. Description of the invention (3) Each data stream can occupy 15 lines. This is the standard number of the original text transmitted in the telegram. At this time, the number of data streams may be M. Each location The number of occupied buses is 300. The present invention further provides a record containing Zhao Yizai The original telex, the textual data is at least partially extended outside the field of view. The telexical textual data is divided into m independent data streams, each of which occupies ^ lines, where m and η are integers, and n is less than Or equal to the number of lines in the line. This record may contain -VHS tapes and telex texts. The data may also be stored at multiple levels and lower than the standard telex texts. The data rate is a low data rate. In this way ' The information can be provided on a record carrier, and it can be fed by a standard telex decoder in a normal television receiver. The main requirement is that the television receiver includes a telex decoder. Most televisions in the UK Both are equipped with a telex original decoder, so the data can be replayed by the TV 2 from the record carrier, and more information is available than the telex original service carried in VBI. It is not important whether the original telex data occupies the entire field, or whether the original telex data extends to all record carrier parts outside the VBI interval. If the full field rate is used, it will be very convenient to spread the telex in the moving picture. It is not important that all lines in a data stream are utilized, or that all data streams contain the same number of lines. The present invention also provides a method to decode the telex original data transmitted by the method of the present invention, or to reproduce it from the record carrier of the present invention. The decoding method includes the following steps: va) m data from the received telex original data A data stream is selected from the stream and b) The telex original signal containing the selected data stream is added at -6 in the VBI interval. This paper scale @ 则 ， 朗 绪 彳 (T " NS > M Specification (210χ2 · chu ( Please read the iif goods on t-page before filling in this page} Order A7 B7 V. Description of the invention (on the telex original decoder. The decoding method of the present invention allows a standard telex original decoder to transmit the record carrier or The replayed data is decoded, because a data stream and time shift are selected, so it occurs in a VBI interval. Therefore, the standard telexian and decoder can identify the telex original signal and decode the signal to generate the _ τν Appropriate display on the display of the receiver. The present invention can also provide a video playback device, which contains a device to select a data stream of the telex source material for playback. It also contains a device for outputting a choice. The original data stream can be output. For example, the playback device of the video cassette recorder includes a device that can encrypt the original telex data recorded on the video tape into a standard original telex format and delay its output until the next VBI. Method, a television receiver will receive a standard telex signal from a number of data streams that occurs outside of vbi in the VBI interval. The present invention can also provide a television receiver that can receive the telex transmitted by the method of the present invention Original data, this TV radio includes a device to select a data stream from m = teletext source data stream, and a device for delaying the selected% teletext source data stream to the teletext source decoder until the next or subsequent The occurrence of VBI. Because the TV receiver is provided with a selection and delay device, the selected teletext source = material can be added to the teletext decoder in a VBIg. Therefore, the standard teletext decoder will be identifiable and Decode the original telex signal. The present invention can also provide a decoder to decode a television signal. Jia 榡 肀 Λ4 Specification (210χ 297 ^ · (Please read the precautions on the back before filling in this page) d

1T-A7 B7 u η -T elimination f: combined if ii printed 5. invention description (5 TV signal contains telex original data generated by the method of the present invention, the decoder package " includes a device to m data One selected from the stream, and the selected data stream is added to a teletext decoder in the VBI section. This decoder may be a so-called box on top of the TV, which can decode the digital from the satellite or the ground transmitter Video broadcasting, or decoding cable TV signals. This decoder may include access control and charging devices for paid channels or pay per application. 上述 The above-mentioned < features and advantages of the present invention will be exemplified by the following specific examples of the present invention The description and reference are more obvious with reference to the following formula 1, in which: Figures 1 to. In order to illustrate the normal and complete way: the signal of the original text of the telex, Figure 4 is a picture of the situation and the choice of services can be described Time shift, Figure 5 is a block diagram illustrating the replay of the original telex data from a video cassette recorder of the present invention, and Figure 6 is the service selector function of the video cassette recorder shown in Figure 5 Fang Figure 7, Figure 7 shows the combination of teletext source data services and reduced-height television images, and Figure 8 illustrates how to choose from a number of data streams—special data streams. Figure 1 represents—a field of a typical television signal. It includes telex source material transmitted during the VBI interval represented during Figure 1A and television images transmitted during the remainder of the field represented during Figure 1b. Typically, a telex decoder will be arranged to find Original telex data in lines i to 22 of field i, and lines 319 to 335 of field 2 in field 2. This is still for a standard 625 -8-this paper size _ 中 _ 婚

V. Description of the invention (6 A7, B7, il, B. J. :), ll, j, t: A Y, a PAL electric line printed for identification. Private, ^ 〇 ,,. In contrast, the full-channel telex source signal occupies the full length of the field except for the 3 and -short-field synchronization sequence separation. Because «The original text will be replaced by 3 TV images during the B period of the TV field. This full-channel teletext source signal signal is known, but the receiver cannot decode it with a standard telegram, because the teletext source decoder is only looking for the teletext source data in the interval. The reason that the teletext decoder can only find the telex data in the M! Interval is to prevent the television image from imitating the telex, and the text and the telex text are incorrect. Detection. Therefore, some image content can generate a number similar to the telex original data, and the telex original decoder decodes it as a private text, but because the telex original decoding is guaranteed, it is only in the VBI interval. The search for the original telex data has eliminated the possibility of false detection caused by the content of the image. However, there is a corresponding disadvantage, that is, the original data of the full-channel telex cannot be decoded. Figure 3 shows the full-channel teletext resource section, which is divided into a number of data streams, each with a period less than the VBI length. This telex source material can be split into 20 separate data streams, each occupying 15 lines. However, it is not necessary that each of these 20 unique lines occupy the same number of lines, but the number of lines of the data stream should be less than or equal to the number of lines in the VBI. In addition, the lines in any data stream are owned by the telex source material and are not necessary. Each of these 20 independent negative materials / J5L provides a separate service, so a service can be launched and the user can choose from them. In order to decode the teletext data of the entire channel, one is selected from 20 independent data streams and a device is provided for shifting the occurrence period of the selected data channel to correspond to a VBI period. -9- This paper & standard iS; species _ 纟.: ㈣ ((, NS) A4 ^ iT210X 297 ^ (Please read the back of the page first • Note the guests before filling out this page) 0. Order A7 B7 V. Description of the invention (7) Figure 4 illustrates this method. If data stream 6 has been selected, as shown in Figure & The data is written into the buffer memory during the online period, which normally includes the τν image signal, but when the full-channel telex text is transmitted, the channel of the original text is transmitted. 6 Occupied. Buffer memory is read during the sub-field VBI, and then — the standard teletext source, the text decoder will recognize it as the teletext source material. For this, the full-channel teletext source data service is divided into m data streams, and each data stream occupies n lines, that is, it is possible to select a second data stream and add it to the teletext decoder during this period. In this example, n is equal to 20 and n is equal to 15. These numbers are not heavy #, it is necessary that the number of lines in each data stream must be less than or equal to the number of lines in the reading, Or within the number of lines included in the original telex decoder, the number of data streams will depend on the number of lines in a television field, and whether or not it is desired to occupy the television field entirely by the original telex. The source may come from a ground-based transmitter, a satellite transmitter or a traditional television transmission from a cable television service. Other sources may be a memory carrier, such as a compact disc or a magnetic tape. If it is a cable television system or satellite broadcast, or from a cable satellite Or & The recommended digital service of the transmitter must have a decoder box inserted before the standard TV receiver. This-the decoder box can convert the transmitted signal from an encrypted format to a pAL system, or provide an RGB output. In the former case, the teletext decoder can be located in the TV receiver. 'Because the TV receiver will receive at least one Cvbs signal, which contains the coded teletext information, or in the latter case, the teletransformer decoder must be located. In the decoder box, because the place is the original of the telex-10. 4. The paper button f _ 诸 彳 (~ CNS) / \ 4 ^ (2IOX297 ^ t) ------------ -ΐ τ ----! 1.1 .i \ (Please read f-face notices and items before filling out this page) A7 B7 V. Description of the invention (8

And can be decoded. During playback from an optical recording playback device or from a video tape recorder, the teletext decoder can be located in the playback device or in a television receiver. If it is in a TV receiver, the connection from the playback device to the TV receiver must be CVBS or tuned to the PAL channel.

I am well aware that standard telex source materials cannot be successfully recorded and replayed from a VHS video cassette recorder. This is because the bandwidth of the video recorder is not enough to power the bandwidth of the original signal. Therefore, during playback, the lost signal that cannot be decoded is generated and the satisfactory original word cannot be received. However, the technique disclosed in UK Patent Application No. 9605614.8 (PHB-34056) can be used to record the telex data on VHS tapes. This application discloses a vhs video recording > machine, which includes a coding device that receives telex textual data and then encodes it into a multilevel signal with a standard telex textual rate. The combination of two bits is coded using a 4-bit code, which is written into the magnetic tape. During playback, an auxiliary decoder is used to convert the four-bit return standard teletext source material. 1¾ of the data can then be added to the teletext decoder located in the VCR, or in a television receiver, and the VCR is connected to it. The details of encoding and decoding, and a video M-type video recorder capable of performing this function will be recorded in our joint patent application No. 96056W.8 (PHB 34〇56), the contents of which are incorporated herein by reference. Figure 5 is a diagrammatic block diagram of the playback function of a VCR, in which the telex signal is coded according to the plan in the aforementioned common patent application, and a full-channel telex text service is provided. This picture only shows the playback function, and there is no recording function, because in the present invention, the data on the tape actually comes from J and does not ____ -11- KS family standard in the paper ruler: Sw] ~ --- ~~ ~~ (Please read the axe surface first. Attention 哫 then fill out this page)

, 1T A7 ____ B7 V. Description of Invention (9) Important. It may be a pre-recorded tape sold by the service provider, or a free user! Recorded by myself, but the green shadow method has nothing to do with the present invention. As shown in 囷 5, the playback function includes a tape playback head 1 which feeds a brightness processor 2. The brightness processor is a pure standard VCR brightness processor. The output of this processor is integrated into a decoder 3 and to the control and timing circuit 4 and a multiplexer 5. The output of the decoder 3 is fed to a buffer memory 6, which outputs to a teletext decoder 7, which converts the output of the buffer into a standard teletext format, and the control and timing circuit 4 receives the brightness The signal from the processor 2 and controls the operation of the decoder 3. The m 'decoder 3 outputs the data from the luminance processor under the control of the control and timing power supply, and performs the de-mapping during each line. The decoder can also be conveniently set to decode each line of data, and the output of the decoded forest is read under the control of the service selection state 8 and entered into the buffer memory 6. The service selector 8 can ensure that only a selected service is outputted to the buffer memory 6 by the brightness processor 2. The output of the self-control and timing circuit 4 is also directly connected to the buffer memory 6 as an enable signal, so that the data in the buffer memory 6 is read into the teletext original coder at normal VBI time. Thus, the data written in the buffer is stored in the buffer memory 6 during a normal video period of one field, and is read out during the next VBI. In order to achieve the choice of special services, the video recorder includes a remote control receiver 15 which receives signals from a remote control handset 9. Therefore, the instruction to enter the remote control handheld transceiver 9 is detected by the receiver 8 and fed to the control and timing circuit. This causes the service selector 8 to generate a write activation signal to the buffer memory 6 at an appropriate time. The multiplexer 5 is controlled by the output of the timing circuit 4 to select data from the teletext original coder 7 'or select video from the brightness processor 2. Root -12- , Milk) 8 4 specifications (2 丨 〇 < 297 mm) ------ (Please read the back-note before filling out this page) Ordering, · u 乂 'J 13 消 f: u V > 71 Imprint 5. :: 13- V. Description of the invention (10) #The full-channel telex or mixed telex original recorded on the tape and the original number of the multiplexer is determined by the -CBVS signal. The signal is fed via a SCART connector, or to-output 10 and connected to-the TV modulator 11, where it is modulated to a UHF carrier and to the air input of the relevant television via turn-out 12. Figure 6 Fig. 5 is a simplified block diagram of a specific example of the service selector 8 of the VCR. This service selector has an input 80, which is fed to a register "which stores the service number requested by the user. The output of the registered card is fed to the comparison The selector 82 is an input, and the second input is connected to the output of the service counter. The input 8 of the service selector 8 is connected to The pulse of the line frequency is then drilled to the line counter 85. This counter also receives a reset signal from the input%, and immediately resets the line counter at the end of each field. The line counter is connected to the service counter 83 in a round. In this example, the line counter ㈣ _ line general service, the output of the counter increment comparator 82 is fed to the multiplexer with the first input 'its second input is received via input 88 _ timing signal ... the control signal is fed to input 89 to Control the input of the multiplexer 87 and feed it to the output of 90. The control signal 89 reveals whether the normal combination of the telex text and the video signal exists or whether the full-frequency telex text data is stored in the timing signal of the input 88 For normal timing, this signal is selected when the combined telex text / video signal is present. When the full-channel telex text is present, the output of the comparator is accumulated to output 90 as a write enable signal for the buffer memory 6. When a This will cause the decoded data to be read out and entered into the buffer memory 6 when the application service flow exists. The output of ~~ P will cause the write start signal to appear for the purpose of 5 lines. During this period, the selected The service is decoded. This paper scales the housekeeping system (2.0X297 ^ «(Please read the cautions on the back before filling this page) α. Order A7 B7 V. Description of the invention (h) Figure 7 shows a situation, That is, at this time, the original telex data can be transmitted, and the τν image can be transmitted at a reduced height. For example, the transmission-letter box type image is in progress, and some active image lines can be used to transmit the original text. When 16x9 aspect ratio images are displayed on a 4x3 aspect ratio TV, some image lines will be left at the top and bottom for other telex data and data services. Included in these lines The original telex data can be time-shifted in the same way as the full-channel telex text data to VBI. FIG. 8 illustrates the selection-specific data m method from the many data streams of the full-channel teletext signal transmission of the present invention. Box 9G represents the step of reading data from the tape to indicate whether there is any full-channel data for mining. At box 91, this information is read from the tape, and an on-screen display begins to invite the user to select a display channel. This is done by the user pressing the number key on the remote control unit. This option is represented by box 92, which is the user's remote access to the digital. The display on the screen then confirmed the selected service, represented by Box 93. The screen then indicates that service has been selected for Corpse 6. This number then enters the service number register 81, and the service selector selects the special data stream to be represented by box 94. After studying the above disclosure, other modifications are possible for those skilled in the art. These modifications may involve features that have been known for a long time in the design and use of television receivers and / or video recorders including telex decoders and assemblies, which may replace features other than those described above. Although the patent scope of this application is a special combination of certain features, we should understand that the scope disclosed in this application also includes any of the novel features mentioned above and any = (combination, or any—or multiple features) The patent application for the invention is related to or can reduce the same technical problems as achieved by the present invention 14-. QI — f Please read the notes on the back before filling this page)

* 1T V. Description of the invention (12; A7 B7, which is extremely obvious to those skilled in the art. The applicant of this invention therefore knows that any other application deduced during the execution of this application may use these Characteristics and / or combined characteristics constitute the scope of the new patent application. (Please read the notes on the back before filling out this page) ci ·, π w—1-MW / n ♦ · / ^ Μ -15- ----- This paper uses the prisoner's house purine ((, | \ 5) / \ 4 specifications (2 丨 0. / 297 mm)

Claims (1)

Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs 1. A method of transmitting the original telex data, including the following steps: a) transmitting the original telex data at least in part during the first period outside the vertical blanking interval (VBI), And b) divide the telex source material into 0 data streams, each-occupying ^ lines, where m and η are integers, and n is less than or equal to the number of lines in vm. 2. The method according to item 丨 of the scope of patent application, in which the original text of the telex was transmitted on a cable TV channel. 3. The method according to item 1 of the scope of patent application is recorded on a record carrier. … A 4. Method VHS video tape according to item 3 of the scope of patent application. 5. The method according to item 4 of the scope of patent application, wherein the telex original data is recorded into multiple quasi signals at a rate lower than the standard telex original data rate. 6. The method according to any of the above patent application parks, where n = 5. 7. A method according to any one of the above patent application scopes, among them. 8. A teletext material is uploaded on a record carrier. The teletext material extends at least partly during a field other than V BI. The teletext material is divided into m independent streams, each occupying η lines, of which m And n are positive percents, and η is less than or equal to the number of lines in the VBI. '9. According to the record carrier of the patent application No. 8, the record carrier is-VHS tape. 10. The record carrier according to item 9 of the scope of the patent application, where the original telex data is based on a number of standards and is at a lower speed than the standard original video data. 1--—HI · I— IQ! Ί Please read the note of t · face before filling in this page]-, 1Τ -16-Good paper size applies to China National Building Standard (CNS) A4ii ^ (210X297) According to the scope of patent application, please refer to the scope of patent application. Please refer to the scope of patent application for the scope of the eighth to the method including the following steps in any of the first to seventh ~ method of acceptance or the self-application of the repetition of any item-the replay record. Carrier, this "selects one of the m data streams that received the telex original data, and adds the telex signal to one telex decoder during the VBI period. Acoustic bare-blood retransmission device 'for recording, telex on another carrier according to page 8 or 9 of the scope of the patent application | replay, this device contains the original data of Dongzhi reading selection telex'- The material "Replay and installation so that power can be transmitted during VBI" The output data stream is output, and there are selected data stream turns around at the seat. A According to the claim of the scope of the patent claim, the 12th basic code application patent patent park, the 9th Xiangguan video playback device includes a VHS video recorder, of which The video green machine includes a device for encoding multiple quasi-codes from the magnetic tape into quasi-telephone original materials .... 14.-After the TV receiver is connected, it can be used according to the patent application park No. 2 Or the video replay device of item 13 of Tutu Telex original data. 15. A television receiver can receive the original data of winter telex according to the method of any one of the items 1 to 7 of the patent application scope. The TV receiver Contains a device I to select one of the m telex source data streams, and the device for delaying the application of the data stream from JI to J: like the original decoder until the next __ or the postscale VJBI- 1 when it was born. 16. —A kind of decoder 'for decoding a television signal, the television signal including the original telex data generated according to the patent application scope A8 B8 C8 D8 111 patent application scope i to ^ 7% ^ Fang Yi, the decoder includes a device one of m data streams and apply this selection The output data stream is a telex original decoder during the VBI period. (Please read ^ -side ^ -Notes before filling in this 1) Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 18- This paper is applicable to China Standard (CNS> A4 wash case (210X297 mm)