CN1215527A - Digital transmission of television signal - Google Patents
Digital transmission of television signal Download PDFInfo
- Publication number
- CN1215527A CN1215527A CN97193605A CN97193605A CN1215527A CN 1215527 A CN1215527 A CN 1215527A CN 97193605 A CN97193605 A CN 97193605A CN 97193605 A CN97193605 A CN 97193605A CN 1215527 A CN1215527 A CN 1215527A
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- CN
- China
- Prior art keywords
- signal
- sampling
- brightness
- sampling frequency
- data
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
- H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
- H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
- H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Systems (AREA)
- Color Television Systems (AREA)
Abstract
Transmission of teletext in a digital television format is disclosed. The video information is transmitted in the conventional YUYV format. For teletext transmission, the U and V sample periods are used to transmit additional luminance samples. Accordingly, teletext is transmitted in YYYY format, which in the CCIR 601 system corresponds to a 27 MHz sampling frequency. Teletext recovery is much more reliable.
Description
Scope of the present invention
The present invention relates to transmit the method and apparatus of TV signal.Transmit the transmission that not only is interpreted as from a television transmitter to one or more television receivers here, to other equipment (for example also comprise from an equipment, indoor at TV broadcast) this locality transmit perhaps transmission in television receiver from a circuit to other circuit.Transmit the storage that also can be regarded as on storage medium (for example, tape and disk etc.).The present invention also relates to the method and apparatus of received television signal.
Background of the present invention
A known transmission of television method comprises all steps, by the luminance component Y of brightness sampling frequency sampling simulation TV signal; Press the chromatic component U and the V of this TV signal of chroma sampling frequency sample.Often the sampling frequency of using is respectively 13.5MHz and 6.75MHz.Sample is converted into as YUYV or YYUV form then.Usually, sample is converted into digital word, but this is optional to the present invention.
Anolog TV signals also can comprise auxiliary data signal, for example: teletext; The VPS data of control of video recorder; The title data of maintaining secrecy; Wide screen communication position.Said data are transmitted in the vertical flyback spaced rows, and the waveform of this data-signal is formed so that in the frequency bandwidth scope of analog signal.This data-signal transmits with the form of luminance signal.In view of the above, in the transfer system of technology, data-signal is generally the 13.5MHz sampling by luminance frequency fy in early days.Have found that (the data cutting of data reconstruction from the data-signal of such sampling; Clock restores) be difficulty and easily make mistake.
Purpose of the present invention and general introduction
The purpose of this invention is to provide and transmit and the method and apparatus of received television signal, will alleviate the problems referred to above of early stage technological system therein.
The method feature that transmits TV signal according to the present invention is following all steps, the luminance signal of in the data line of brightness sampling frequency, taking a sample in TV signal, this sampling frequency is higher than the brightness sampling frequency in video line, so that the brightness that obtains adding sampling transmits said additional brightness sample simultaneously and replaces for the chroma sampling product.
The present invention is based on the approval data-signal and do not comprise chromatic component.By utilizing the chroma sampling cycle to carry the data-signal sampling by the YUYV transformat, this data-signal may be transmitted with quite high sampling rate, and does not increase whole transfer rate.Be added to the running performance that data cutting on the sampled data signal and clock restore thereby suitable improvement is arranged.
In a preferred embodiment, all chroma sampling cycles are used as the data-signal transmission.In the system of a brightness sampling frequency that the 13.5MHz routine arranged and 6.75MHz chroma sampling frequency, data-signal can be sampled on 27MHz.
The accompanying drawing summary
Fig. 1 and Fig. 2 illustrate the circuit that is used to transmit TV signal according to the present invention.
Fig. 3 is the time diagram of explanation circuit running illustrated in figures 1 and 2.
Fig. 4 illustrates the circuit that is used for received television signal according to the present invention.
Fig. 5 illustrates the television receiver of further opinion according to the present invention with numerical calculation method treatment of simulated input signal.
The embodiment explanation
Fig. 1 illustrates the circuit that is used to transmit TV signal according to the present invention.This circuit receives an analog rgb vision signal and teletext data TXT.By translation circuit 1, this rgb video signal is converted into an analoging brightness component Y and two chromatic component U and V.Teletext data is shaped through wave forming circuit 2.In simulated television transmission scope, translation circuit 1 and wave forming circuit 2 are well-known.Data-signal d, brightness signal Y and carrier chrominance signal U and V are added on separately the sampling stage and A/ D converter 3,4,5,6 respectively.These sampling stages and A/D converter receive the sampling frequency separately from clock generator circuit 7.In existing example, luminance signal is taken a sample with fy=13.5MHz, and all with the fc=6.75MHz sampling, data-signal d is the last sampling of f ' y=27MHz with twice luminance signal sampling frequency for carrier chrominance signal U and V.The brightness sampling of numeral represents that with Y the chroma sampling of numeral is represented with U and V, and the data-signal sampling is represented with D.Sampling is added on the transformat circuit 8 that also receives " data line " signal DL, and signal DL represents that existing television line is the capable or teletext line of effective video.Usually, teletext line is selected as the row in video flyback interval, but this is optional for the purpose of the present invention.As DL when being low, formating circuit 8 is suitable for the video the same system's output of conversion imaging continuous sequence YUYV of taking a sample, and as DL when being high, formating circuit 8 is suitable for usefulness DDDD format conversion data sampling.
Fig. 2 illustrates another embodiment of circuit.Suppose that now this circuit receives a simulation mixed video signal CVBS, this signal has comprised figure message TV signal in selecteed television line.This signal is added on the video processor 10, and processor 10 is divided into input signal its luminance component Y and chromatic component U and V.These components are added to sampling stage and A/D converter 11-13 separately.Now sampling frequency is by selecting circuit 14 to obtain, and circuit 14 is selected in response to a signal one of in its input of data line signal DL.If DL is low, chosen from the sampling frequency fy and the fc of the routine of clock generator circuit 7.If DL is high, luminance channel is selected sampling frequency f ' y=27MHz, but chrominance channel is not taken a sample.Therefore, when video line, will export conventional sequence YUYV by circuit.Otherwise, when data line, produce sequence YYYY, the 27MHz sampling of each Y designate data signal.
Fig. 3 illustrates the time diagram of explanation circuit operation illustrated in figures 1 and 2.Waveform A represents master clock signal, the high sampling frequency of its corresponding system, i.e. f ' y=27MHz in this example.Waveform B and C illustrate two outputs that remove 2 grades (not shown among Fig. 1 and Fig. 2) continuously in the clock generator circuit.Waveform D is conventional brightness sampling clock fy=13.5MHz.Waveform E is chroma sampling clock fc=6.75MHz in the U passage.Chroma sampling clock fc=6.75MHz in waveform F and the V passage.The output signal that (DL is low) pressed the circuit of YUYV form when waveform G was illustrated in video line.(DL is for high) pressed the signal of the output of YYYY form (or using the DDDD symbolic representation in Fig. 1) circuit when waveform H was illustrated in teletext line.
Fig. 4 illustrates the circuit that is used for the receiving circuit signal by of the present invention.Digital television signal not only is added to the Video processing level but also is added to teletext to be handled on the level.A key property of the present invention is that what not need at first to determine to be received is YUYV sequence or YYYY sequence, also do not need for respond said determine signal is added to or video processor or teletext processor on.
The Video processing level is suitable for handling the sampling of YUYV sequence, and it comprises demultiplexer 40, and it is divided into the Y-sampling with input signal, U-sampling and V-sampling.They are added to D/A converter 41-43 separately, so that obtain an analog luminance signal Y and analog chrominance signal U and V, Y, U and V are added to conventional simulation video processor 44.This video processor 44 can be a digital processing circuit.In this case, the D/A conversion is carried out after said processing.
Handle level by input signal is added to teletext through line 47, the digital sampling that constitutes digital signal is connected together.Teletext is handled level and comprise the D/A converter 45 that turns round of suiting on the 27MHz sampling frequency.Analog signal d is added to conventional simulation teletext decoder 46 then.On the other hand, teletext decoder can be a digital decoder, and it is understood that to realize the process that data cutting and clock restore by Digital Signal Processing.Under the sort of situation, D/A converter 45 can be removed.
In general, teletext transmits in TV signal vertical flyback at interval.This teletext decoder only is arranged at decoding data in the said interval.The present invention also may transmit teletext in the effective video spaced rows.The decoder that is shown in Fig. 4 will be handled this mode of operation automatically, because decoder receives gross sample when all television lines.Can randomly show that in the effective video interval sign indicating number that transmits teletext can be transmitted.
By further aspect of the present invention, be shown in Fig. 5 with the television receiver of digital processing analog input signal.Because, adopt identical reference numerals to very similar of circuit shown in Figure 2.To understand than being easier to referring to Fig. 2 so, television receiver receives anolog TV signals CVBS, and video line is become digital YUYV sequence, and data line is become the YYYY sequence.Replace the sampling of transmission, the YUV sampling is added to digital video processor 48 now, and still, the Y sampling also is added on the digital teletext decoder 49.Conventional simulation television receiver with digital processing unit 48 and 49 is useful on four A/D converters of figure message TV signal.This converter has been removed in being shown in the receiver of Fig. 5.
The transmission of the teletext of digital television format is disclosed in a word.Video information transmits with conventional YUYV form.For transmitting teletext, U and V sampling period are used to transmit additional brightness sampling.Thus, teletext transmits with the YYYY form, and it is 27MHz corresponding to sampling frequency in CCIR 601 systems.The recovery of teletext is very reliable.
Claims (11)
1. transmit the method for TV signal, comprise following all steps: (fy, (U V), transmits said sampling simultaneously fc) to go up the luminance component (Y) of sampling TV signal and chromatic component in separately sampling frequency.Be characterised in that following all steps:
The brightness sampling frequency (f ' y) goes up the luminance signal of taking a sample in the data line in TV signal, this sampling frequency (f ' y) is higher than brightness sampling frequency (fy) in video line, so as the brightness that obtains adding sampling and
Transmit said additional brightness sampling and replace chroma sampling.
2. by the process of claim 1 wherein that the number of additional brightness sampling equals chroma sampling number in the video line of TV signal in data line.
3. by the method for claim 2, wherein the frequency of brightness sampling is 13.5MHz in video line, the frequency of chroma sampling be 6.75MHz and in data line the brightness sampling frequency be 27MHz.
4. by the method for sampling form received television signal, comprise following all steps:
Link brightness sampling (Y) is to obtain going up in brightness sampling frequency (fy) luminance signal of sampling in the video line of TV signal.
In the video line of TV signal, link chroma sampling (U V) to obtain going up in chroma sampling frequency (fc) carrier chrominance signal of sampling, is characterised in that following steps:
(f ' y) go up the data-signal of taking a sample, f ' y is higher than the brightness sampling frequency (fy) in video line to all samplings of link in sampling frequency to obtain in the data line of TV signal.
5. press the method for claim 4, it is characterized in that following all steps: decipher the sign indicating number of sampled data-signal, also link all samplings in response to the TV signal in the video line of the signal of detected sign indicating number with the transmission of data-signal in the video line that obtains being illustrated in TV signal.
6. press the method for claim 4, it is characterized in that following all steps: also be linked at all samplings in the video line of TV signal, (signal of the sampling of f ' y) is deciphered said sampled signal to determine whether it is data-signal by higher sampling frequency to obtain.
7. be used to transmit the equipment of TV signal, comprise the device that is suitable for the method for any claim among the enforcement of rights requirement 1-3.
8. the equipment that is used for received television signal comprises the device that is suitable for the method for any claim among the enforcement of rights requirement 4-6.
9. TV signal with brightness and chroma sampling form, comprise and have at the sampling of the brightness on the brightness sampling frequency (fy) (Y) and the chroma sampling product (U on chroma sampling frequency (fc), Y) video line, it is characterized in that signal comprises sampling frequency is only arranged that (data line of the brightness sampling of f ' y), its f ' y is higher than brightness sampling frequency (fy) in video line.
10. a medium is stored the TV signal as the claim in the claim 9.
11. a television receiver is basically by shown in Figure 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96203528 | 1996-12-12 | ||
| EP96203528.3 | 1996-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1215527A true CN1215527A (en) | 1999-04-28 |
Family
ID=8224691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97193605A Pending CN1215527A (en) | 1996-12-12 | 1997-12-04 | Digital transmission of television signal |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0883961A2 (en) |
| JP (1) | JP2000505975A (en) |
| KR (1) | KR19990082459A (en) |
| CN (1) | CN1215527A (en) |
| AU (1) | AU5065598A (en) |
| WO (1) | WO1998026591A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780407B (en) * | 2004-11-23 | 2013-03-27 | 三星电子株式会社 | Display device and method with optimal external input setting capability |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2161106C3 (en) * | 1971-12-09 | 1974-08-08 | Ted Bildplatten Ag Aeg-Telefunkenteldec, Zug (Schweiz) | Circuit for generating a narrow-band, three-line sequential color television signal |
| JP2529482B2 (en) * | 1991-05-24 | 1996-08-28 | 松下電器産業株式会社 | Digital component video signal processor |
-
1997
- 1997-12-04 WO PCT/IB1997/001515 patent/WO1998026591A2/en not_active Application Discontinuation
- 1997-12-04 KR KR1019980706192A patent/KR19990082459A/en not_active Application Discontinuation
- 1997-12-04 AU AU50655/98A patent/AU5065598A/en not_active Abandoned
- 1997-12-04 CN CN97193605A patent/CN1215527A/en active Pending
- 1997-12-04 EP EP97913366A patent/EP0883961A2/en not_active Withdrawn
- 1997-12-04 JP JP10526416A patent/JP2000505975A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780407B (en) * | 2004-11-23 | 2013-03-27 | 三星电子株式会社 | Display device and method with optimal external input setting capability |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998026591A2 (en) | 1998-06-18 |
| AU5065598A (en) | 1998-07-03 |
| KR19990082459A (en) | 1999-11-25 |
| WO1998026591A3 (en) | 1998-08-13 |
| EP0883961A2 (en) | 1998-12-16 |
| JP2000505975A (en) | 2000-05-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |