NO309789B1 - Method for processing a serial digital data signal - Google Patents

Method for processing a serial digital data signal Download PDF

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Publication number
NO309789B1
NO309789B1 NO963855A NO963855A NO309789B1 NO 309789 B1 NO309789 B1 NO 309789B1 NO 963855 A NO963855 A NO 963855A NO 963855 A NO963855 A NO 963855A NO 309789 B1 NO309789 B1 NO 309789B1
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Norway
Prior art keywords
signal
data signal
sampling
frequency
sampling values
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NO963855A
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Norwegian (no)
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NO963855D0 (en
NO963855L (en
Inventor
Andreas Ebner
Klaus Schuster
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Konle Tilmar
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Publication of NO963855D0 publication Critical patent/NO963855D0/en
Publication of NO963855L publication Critical patent/NO963855L/en
Publication of NO309789B1 publication Critical patent/NO309789B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/007—Systems with supplementary picture signal insertion during a portion of the active part of a television signal, e.g. during top and bottom lines in a HDTV letter-box system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/068—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection by sampling faster than the nominal bit rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • 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

Abstract

In order to obtain reliable information more rapidly when decoding signal elements of a serial, digital data signal in a television signal, the signal element is scanned at a scanning frequency which corresponds to a common multiple of the frequency positions of the signal elements, if the signal element only bears a single information unit. The sequence of the scan values produced when a signal element is scanned is subject to a majority check.

Description

Oppfinnelsen angår en fremgangsmåte ifølge den innledende del av patentkrav 1. En slik fremgangsmåte er tidligere kjent fra DE-A-41 12 712 . The invention relates to a method according to the introductory part of patent claim 1. Such a method is previously known from DE-A-41 12 712.

Ved signalering av forskjellige bildeformater og tilleggsinformasjoner (for eksempel for forskjellige typer forhåndsfiltrering av signaler) for bredbilde-mottakere, er det kjent fra DE-A-41 12 712 å overføre serielle, digitale signaler i den første halvparten av linje 23 i fjernsynssignalet. Disse serielle, digitale signalene har en spesiell blandingsstruktur; pr helbilde (=halve linje 23) består de for eksempel av signalelementer i forskjellige frekvensområder i startfasen, og av 14 bi-fasemodulerte signalelementer, av hvilke 4 signalelementer signaliserer bildeformatet som et 3-bit-dataord pluss et feilbeskyttelses-element, og de resterende 10 signalelementene signaliserer ytterligere tilleggs-informasjon. Vanligvis blir denne blandingstrukturen gitt en frekvensmessig oppdeling før dekodingen, for at man skal kunne dekode signalelementene adskilt. Da det dreier seg om en svært kritisk informasjon ved bildeformat-signaleringen, må - for å oppnå et minstemål av signalerings-pålitelighet også ved ugunstige mottakerforhold, spesielt ved kantene av kringkastnings-dekningsområdene - dataordene fra minst tre etter hverandre følgende helbilder avventes og evalueres, før et endelig utsagn avgis. Når en bruker foretar raske kanalskifter("zapp-ing"), fører imidlertid denne relativt langsomme vurderingen eventuelt til feilaktige format-innstillinger for bredbildemottakeren. When signaling different image formats and additional information (for example for different types of pre-filtering of signals) for widescreen receivers, it is known from DE-A-41 12 712 to transmit serial digital signals in the first half of line 23 of the television signal. These serial digital signals have a special mixing structure; per full frame (=half line 23) they consist, for example, of signal elements in different frequency ranges in the start phase, and of 14 bi-phase modulated signal elements, of which 4 signal elements signal the image format as a 3-bit data word plus an error protection element, and the remaining The 10 signal elements signal further additional information. Usually, this mixture structure is given a frequency-wise division before decoding, in order to be able to decode the signal elements separately. As this is a very critical piece of information in the picture format signalling, - in order to achieve a minimum measure of signaling reliability even in unfavorable receiver conditions, especially at the edges of the broadcast coverage areas - the data words from at least three consecutive full pictures must be awaited and evaluated, before a final statement is made. However, when a user makes rapid channel changes ("zapp-ing"), this relatively slow evaluation eventually leads to incorrect format settings for the widescreen receiver.

EP-A-0 551 695 beskriver mottakingen av et bi-fasekodet signal med fast datahastighet under oversampling, hvorved samplingsfrekvensen er en heltallig multippel av datahastigheten bare under sampling av synkronordene, for å fastslå signalets faseposisjon. Nyttedatasignalet blir diskontinuerlig samplet: En gruppe av samplingsimpulser sampler flere ganger hver bit bare i omegnen til sitt midtpunkt, mens i nærheten av randen blir det ikke innhentet noen samplingsverdier. EP-A-0 551 695 describes the reception of a fixed data rate bi-phase coded signal under oversampling, whereby the sampling frequency is an integer multiple of the data rate only during sampling of the sync words, to determine the phase position of the signal. The useful data signal is discontinuously sampled: A group of sampling impulses samples each bit several times only in the vicinity of its midpoint, while in the vicinity of the edge no sampling values are obtained.

Formålet ved oppfinnelsen består i å oppnå et pålitelig utsagn raskere ved dekoding av signalelementene i et serielt, digitalt datasignal. The purpose of the invention is to obtain a reliable statement more quickly by decoding the signal elements in a serial, digital data signal.

Dette formålet oppnås i følge oppfinnelsen ved hjelp av de kjennetegnende trekk i patentkrav 1. This purpose is achieved according to the invention by means of the characteristic features in patent claim 1.

Fordelaktige utførelser og videreutviklinger av fremgangsmåten i følge oppfinnelsen fremgår av de uselvstendige kravene. Advantageous embodiments and further developments of the method according to the invention appear from the independent claims.

Oppfinnelsen utgår fra den ide å unngå en frekvensmessig oppdeling av det mottatte, digitale signalet i høy/lavfrekvente signalelementer, og isteden å tilveiebringe en enhetlig samplingsfrekvens for samtlige signalelementer som tilsvarer et felles multiplum for de aktuelle frekvensleier for signalelementene. Dermed blir signalelementene samplet med en i forhold til samplingsteoremet vesentlig forhøyet samplingsfrekvens ("oversampling"), hvorved ikke bare en eneste samplingsverdi står til rådighet pr helbilde og for hver signalelement, men en følge av flere samplingsverdier. Denne følgen av flere samplingsverdier for hvert signalelement og hvert helbilde tillater anmeldelse av en statistisk majoritetstest, hvorved man kan avgi et pålitelig utsagn, uten å måtte ta hensyn til dataordene fra de etterfølgende helbildene. Som resultat gir et helbilde mulighet for å komme frem til tilsvarende utsagn om bildeformat/signaleringen, slik at også når brukeren foretar raske kanalskifter, sikres alltid en riktig The invention is based on the idea of avoiding a frequency-wise division of the received digital signal into high/low frequency signal elements, and instead of providing a uniform sampling frequency for all signal elements which corresponds to a common multiple of the relevant frequency ranges for the signal elements. Thus, the signal elements are sampled with a substantially increased sampling frequency in relation to the sampling theorem ("oversampling"), whereby not only a single sampling value is available per full frame and for each signal element, but a result of several sampling values. This succession of multiple sampling values for each signal element and each frame allows the review of a statistical majority test, whereby a reliable statement can be made, without having to take into account the data words from the subsequent frames. As a result, a full picture gives the opportunity to arrive at corresponding statements about the picture format/signaling, so that even when the user makes rapid channel changes, a correct

format/innstilling av bredbildemottakeren. format/setting of the widescreen receiver.

Oppfinnelsen skal heretter forklares nærmere ved hjelp av tegningene. I tegningene viser: Fig.l en anordning for gjennomføring av fremgangsmåten i The invention will now be explained in more detail with the help of the drawings. The drawings show: Fig.1 a device for carrying out the method i

følge oppfinnelsen, og follow the invention, and

Fig.2 diagrammer over signaler som opptrer på Fig.2 diagrams of signals that act on

forskjellige punkter i anordningen i henhold til figur 1. different points in the device according to Figure 1.

Anordningen som vises i figur 1, tilføres et serielt, digitalt datasignal slik som vist i figur 2a, hvilket datasignal overføres i tids/multipleks med et analogt fjernsynssignal i første halvpart av fjernsynslinje 23. Dette datasignalet angår det såkalte "Wide-Screen-Signaling"-signalet, som i startfasen oppviser flere signalelementer 2, 3 med forskjellige frekvenser samt 14 signalelementer 4 med like frekvenser. Ved fremstillingen i figur 2a dreier det seg bare om et utsnitt av datasignalet som overføres for hver halve fjernsynslinje 23 i hvert helbilde. The device shown in figure 1 is supplied with a serial, digital data signal as shown in figure 2a, which data signal is transmitted in time/multiplex with an analogue television signal in the first half of television line 23. This data signal relates to the so-called "Wide-Screen-Signaling" - the signal, which in the initial phase exhibits several signal elements 2, 3 with different frequencies as well as 14 signal elements 4 with equal frequencies. In the representation in Figure 2a, it is only a matter of a section of the data signal that is transmitted for each half of the television line 23 in each full picture.

I et trinn 11 blir det tilført serielle, digitale datasignalet i følge figur 2a adskilt fra fjernsynsignalet og begrenset, slik det fremgår av figur 2b. I et etterfølgende trinn 21 blir det separerte og avgrensede datasignalet samplet med en klokkefrekvens som utgjør et felles multiplum for frekvensleiene for signalelementene med de forskjellige frekvenser. For signalelementene 4 i signalet i følge figur 2a betyr denne relativt høyfrekvente samplingen at hvert signalelement 4, slik det fremgår av figur 2c, blir samplet flere ganger, i det viste utførelseseksempelet seks ganger. In a step 11, the supplied serial, digital data signal according to Figure 2a is separated from the television signal and limited, as can be seen from Figure 2b. In a subsequent step 21, the separated and delimited data signal is sampled with a clock frequency which constitutes a common multiple of the frequency ranges for the signal elements with the different frequencies. For the signal elements 4 in the signal according to figure 2a, this relatively high-frequency sampling means that each signal element 4, as can be seen from figure 2c, is sampled several times, in the embodiment shown six times.

Da hvert signalelement 4 langs lengden P (figur 2c) er bi-fase-modulert, blir samplingsverdiene for det inverterte avsnittet av signalelement invertert ved demodulasjonen i trinnet 31, slik det fremgår av figur 2d. Etter oppnådd demodulasjon blir de samplingsverdiene som er tilordnet signalelementene 4, utskift (Fig. 2e) i trinn 31, og i det etterfølgende trinn 41 - adskilt for hvert signalelement 4 - blir samplingsverdiene summert i henhold til deres logiske tilstander. I det etterfølgende trinnet 51 foregår - på nytt adskilt for hvert signalelement 4 - en evaluering av summer-ingen, som går ut på at en majoritetsavgjørelse på enkel eller veiet form foretas, idet det tas hensyn til en terskelverdi. Eksempelvis gjelder et summasjonsresultat som riktig, når 70% av de summerte samplingsverdiene for et signalelement 4 tilsvarer en logisk tilstand. Dersom summasjonsresultatene for samtlige lavfrekvente signalelementer 4 per helbilde ligger over terskelverdien, gjelder totalresultatet som sikkert, og gis videre til trinnet 61. Trinnet 61 dekoder så 3-bit-ordet som består av de tre lavfrekvente signalementene, og fører resultatet til bildeformat/innstillingstrinnet i bredbildemottakeren. As each signal element 4 along the length P (figure 2c) is bi-phase modulated, the sampling values for the inverted section of signal element are inverted during the demodulation in step 31, as is evident from figure 2d. After achieved demodulation, the sampling values assigned to the signal elements 4 are replaced (Fig. 2e) in step 31, and in the subsequent step 41 - separately for each signal element 4 - the sampling values are summed according to their logic states. In the subsequent step 51 - again separately for each signal element 4 - an evaluation of the summation takes place, which entails that a majority decision in simple or weighted form is made, taking into account a threshold value. For example, a summation result is considered correct when 70% of the summed sample values for a signal element 4 correspond to a logic state. If the summation results for all low-frequency signal elements 4 per full frame are above the threshold value, the total result applies as certain, and is passed on to step 61. Step 61 then decodes the 3-bit word consisting of the three low-frequency signal elements, and takes the result to the picture format/setting step in the widescreen receiver.

Claims (3)

1. Fremgangsmåte for behandling av et serielt, digitalt datasignal, hvilket datasignal inneholdes i et fjernsynssignal og blir utskilt fra dette, hvilket datasignal videre er innsatt i en uforanderlig dataramme og oppviser signalelementer i forskjellige frekvensleier, ved hvilken fremgangsmåte datasignalet blir samplet og de fremkommende samplingsverdiene blir korrelert med det samplede datasignalets dataramme, karakterisert ved at for det tilfellet hvor hvert signalelement bare bærer en enkelt in-formasjonsenhet, blir signalelementet samplet med en forhøyet samplingsfrekvens i forhold til signalelementets frekvensleie, hvorved samplingsfrekvensen, i frekvens- og faseposisjon, tilsvarer et felles multiplum for alle signalelementenes frekvensleier, og at følgen av samplingsverdier som oppstår ved samplingen av signalelementene, underkastes en rnajoritetstest på enkel eller veiet form.1. Method for processing a serial, digital data signal, which data signal is contained in a television signal and is separated from this, which data signal is further inserted into an unchanging data frame and exhibits signal elements in different frequency ranges, by which method the data signal is sampled and the resulting sampling values is correlated with the sampled data signal's data frame, characterized in that for the case where each signal element only carries a single information unit, the signal element is sampled with an elevated sampling frequency in relation to the signal element's frequency range, whereby the sampling frequency, in frequency and phase position, corresponds to a common multiple for all the signal elements' frequency range, and that the result of sampling values that occur during the sampling of the signal elements is submitted to a simple or weighted majority test. 2. Fremgangsmåte i følge krav 1, karakterisert ved at signalelementet er Bi-Fase-Kodet, at samplingsverdiene for det inverterte avsnitt av signalelementet blir invertert før majoritetstesten på enkel eller veiet form, og at de ikke-inverterte og de inverterte samplingsverdiene bedømmes som gyldige når antallet samplingsverdier for den ene polaritet ligger over en!fastlagt terskelverdi.2. Method according to claim 1, characterized in that the signal element is Bi-Phase Coded, that the sampling values for the inverted section of the signal element are inverted before the majority test in simple or weighted form, and that the non-inverted and the inverted sampling values are judged to be valid when the number of sampling values for one polarity is above a specified threshold value. 3. Fremgangsmåte i følge krav 1 eller 2, karakterisert ved at et signaleringssignal for det aktuelle bildeformat for en bredbildemottaker blir anvendt som digitalt datasignal, og at i et tilfelle med gjengivelse av datasignalet fra en hjemme-videoopptaker, bare det testede signalelementet blir anvendt for styring av bredbildemottåkerens bildeformat.3. Method according to claim 1 or 2, characterized in that a signaling signal for the relevant image format for a widescreen receiver is used as a digital data signal, and that in a case of reproduction of the data signal from a home video recorder, only the tested signal element is used for control of the widescreen receiver's image format.
NO963855A 1994-03-16 1996-09-13 Method for processing a serial digital data signal NO309789B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4408963A DE4408963A1 (en) 1994-03-16 1994-03-16 Method for processing a serial, digital data signal
PCT/EP1995/000969 WO1995025401A1 (en) 1994-03-16 1995-03-15 Method of processing a serial, digital data signal

Publications (3)

Publication Number Publication Date
NO963855D0 NO963855D0 (en) 1996-09-13
NO963855L NO963855L (en) 1996-09-13
NO309789B1 true NO309789B1 (en) 2001-03-26

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EP (1) EP0750820B1 (en)
JP (1) JP3446010B2 (en)
KR (1) KR100361509B1 (en)
AT (1) ATE170691T1 (en)
CZ (1) CZ284936B6 (en)
DE (2) DE4408963A1 (en)
DK (1) DK0750820T3 (en)
ES (1) ES2121360T3 (en)
FI (1) FI114522B (en)
HU (1) HU216226B (en)
NO (1) NO309789B1 (en)
PL (1) PL175762B1 (en)
WO (1) WO1995025401A1 (en)

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DE19815701A1 (en) * 1998-04-08 1999-10-14 Bosch Gmbh Robert Method for demodulating a carrier wave modulated with a digital symbol sequence
US6735249B1 (en) 1999-08-11 2004-05-11 Nokia Corporation Apparatus, and associated method, for forming a compressed motion vector field utilizing predictive motion coding
DE10007783A1 (en) * 2000-02-21 2001-08-23 Rohde & Schwarz Method and arrangement for data and clock recovery in a biphase-coded data signal
US8433991B2 (en) 2010-06-16 2013-04-30 Qualcomm Incorporated Global Navigation Satellite System (GLONASS) data bit edge detection
US8780958B2 (en) 2010-08-27 2014-07-15 Qualcomm Incorporated Hybrid bit extraction for global position receiver
US8619919B2 (en) 2010-10-14 2013-12-31 Qualcomm Incorporated Selective coherent and non-coherent demodulation methods and apparatuses

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GB1268366A (en) * 1968-11-27 1972-03-29 Standard Telephones Cables Ltd Telecommunication switching centre
FR2377729A1 (en) * 1977-01-14 1978-08-11 Thomson Csf DEVICE FOR DECODING DIGITAL SIGNALS, AND SYSTEM INCLUDING SUCH A DEVICE
EP0472756B1 (en) * 1990-08-29 1995-08-16 Deutsche ITT Industries GmbH Device for separating a signal
DE4112712A1 (en) * 1991-04-18 1992-10-22 Inst Rundfunktechnik Gmbh Compatible transmission of television signal mode additional information
US5373534A (en) * 1992-01-14 1994-12-13 Matsushita Electric Industrial Co., Ltd. Serial data receiving apparatus
DE4307686A1 (en) * 1993-03-11 1994-09-15 Inst Rundfunktechnik Gmbh Method of processing a serial digital data signal

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Publication number Publication date
PL175762B1 (en) 1999-02-26
PL316041A1 (en) 1996-12-23
WO1995025401A1 (en) 1995-09-21
HU9602500D0 (en) 1996-11-28
HU216226B (en) 1999-05-28
FI114522B (en) 2004-10-29
EP0750820A1 (en) 1997-01-02
DK0750820T3 (en) 1999-06-07
KR100361509B1 (en) 2003-02-14
KR970701960A (en) 1997-04-12
NO963855D0 (en) 1996-09-13
FI963621A (en) 1996-09-13
ATE170691T1 (en) 1998-09-15
DE4408963A1 (en) 1995-09-21
DE59503433D1 (en) 1998-10-08
JP3446010B2 (en) 2003-09-16
FI963621A0 (en) 1996-09-13
EP0750820B1 (en) 1998-09-02
ES2121360T3 (en) 1998-11-16
CZ243796A3 (en) 1996-12-11
HUT75486A (en) 1997-05-28
JPH09505192A (en) 1997-05-20
NO963855L (en) 1996-09-13
CZ284936B6 (en) 1999-04-14

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