DE1808739A1 - Method for transmitting a single television picture over a narrowband channel - Google Patents

Method for transmitting a single television picture over a narrowband channel

Info

Publication number
DE1808739A1
DE1808739A1 DE19681808739 DE1808739A DE1808739A1 DE 1808739 A1 DE1808739 A1 DE 1808739A1 DE 19681808739 DE19681808739 DE 19681808739 DE 1808739 A DE1808739 A DE 1808739A DE 1808739 A1 DE1808739 A1 DE 1808739A1
Authority
DE
Germany
Prior art keywords
digital
analog
video signal
signal
channel
Prior art date
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.)
Pending
Application number
DE19681808739
Other languages
German (de)
Inventor
Karl-Bernd Buss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Priority to DE19681808739 priority Critical patent/DE1808739A1/en
Priority to CH1482069A priority patent/CH498537A/en
Priority to FR6938012A priority patent/FR2023244A7/fr
Priority to GB1251439D priority patent/GB1251439A/en
Publication of DE1808739A1 publication Critical patent/DE1808739A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
    • H04N7/122—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal involving expansion and subsequent compression of a signal segment, e.g. a frame, a line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Television Signal Processing For Recording (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Description

G R ü K D I G E.M.V. Fürtb, an 11.11.68G R ü K D I G E.M.V. Fürtb, on 11/11/68 Elektro-Mechanische Versuchsanstalt 788/Ba/Fa.Electromechanical Research Institute 788 / Ba / Fa. Inh. Max GrundigOwner Max Grundig FUrth (Bayern), Kurgart·πβtraße 37 Reg. FUrth (Bavaria), Kurgart · πβtraße 37 Reg.

Verfahren zum übertragen eines Fernseheinzelbildes über einen SchwalbandkanalMethod for transmitting a television frame via a Schwalbandkanal

Die Erfindung betrifft ein Verfahren zum Übertragen eines Fernseheinzelbildes über einen Schaalbandkanal, vorzugsweise einen Telefonkanal. The invention relates to a method for transmitting a television frame via a Schaalbandkanal, preferably a telephone channel.

Das Videosignal nimmt ein breites FrequenzbandThe video signal occupies a wide frequency band

ein, das von sehr tiefen Frequenzen von etwa 50 Hz bis zu sehr hohen Frequenzen von Mehrerenone that ranges from very low frequencies of around 50 Hz to very high frequencies of several

Megahertz, bei der Europäischen Ferneehnorm bisMegahertz, for the European television standard up to

5 MHz, reicht. Entsprechend braucht man su seiner5 MHz is enough. Accordingly, one needs su his

Übertragung in der Regel einen breitbandigen über-Transmission usually over a broadband

traguKgskanal, dessen Bereitstellung wesentlich höhere Kosten verursacht als etwa die eines sclmalbandigen Kanals, z.B. eines Telefonkanals. Bei einesTraguKgskanal, the provision of which is essential causes higher costs than, say, a narrow-band Channel, e.g. a telephone channel. With one

Ferneeheinzelbild Jedoch, bei de· die InformationRemote single picture However, at the · the information

von Bild su Bild nicht ausgetauscht wird, z.B.from picture to picture is not exchanged, e.g.

einer Momentaufnahme aus einer Fernsehsendung, einer Schriftvorlage oder einer Photographic, ist die Übertragene Information hoch redundant und ein breitbandiger Übertragungskanal stellt, infor-a snapshot from a TV show, a font or a photographic the transmitted information is highly redundant and a broadband transmission channel provides information

aationstheoretiseh gesehen, einen Luxus dar. - _From a theoretical point of view, represents a luxury. - _

BAD ORIGINALBATH ORIGINAL

009887/0677009887/0677

Reg.Reg.

Ks let bereits ein« Einrichtung zur Einzelbildübertragung über einen Schmalbandkanal bekannt, bei der ein durch zeitliche Dehnung in den Tonfrequenzbereich transpontiertes Einzelbildaignal auf eine« Magnetband bei langsamer Relativgeschwindigkeit zwischen Magnetkopf und Aufzeichnungsträger aufgezeichnet und durch, wiederholte Abtastung bei erhöhter Relativgeschwindigkeit auf einer Brauneeben Rühre als stehendes Bild sichtbar gemacht wird.Ks let already a «facility for single image transmission Known via a narrow band channel, in which a single image signal transposed into the audio frequency range by time expansion onto a magnetic tape at a slow relative speed between the magnetic head and the recording medium recorded and repeated by scanning at increased relative speed is made visible as a standing image on a brown plane.

Machteilig bei diese« Verfahren ist neben derAdvantageous in this «procedure is next to the

großen Abnutzung auf Orund der vielen Mechanisch ' bewegten Teile die analoge Aufzeichnung, da diesegreat wear and tear on orund the many mechanically moving parts the analog recording, as this

sehr eztpflndlieh gegen Stttrsignale ist. ·is very useful against local signals. ·

Dies· Mangel werden erfindungsgemaß dadurch behoben, daß das Videosignal des zn übertragenden Fernseheinzelbildes nach seiner Umwandlung mittels eines Analog-Digital-Vandler« in ein Digitalsignal in einem Magnetkernspeicher gespeichert und aus diesem mit einer der Übertragungskapazität angepaßten bit-Folge abgefragt wird, dafl ferner das so entstehende Digitalsignal Über den fchmalbandkanalThis deficiency is remedied according to the invention by that the video signal of the transmitted television frame after its conversion by means of a Analog-Digital-Vandler «into a digital signal in stored in a magnetic core memory and adapted from this with one of the transmission capacity bit sequence is queried, so that also the resulting Digital signal Via the narrowband channel

BAD ORIGINALBATH ORIGINAL

0098877067700988770677

Reg. Reg. lkkOlkkO

Übertrag*11 wird und auf der Kapfange se it e in •inen weiteren Magnetkernspeicher gelangt, aus des daa Videosignal nach der für ein Bild notwendigen Übertragungszeit Über einen Digital-Analog- Wandler beliebig oft herausgelesen werden kann.Carry * 11 is carried out and on the cap it reaches another magnetic core memory, from which the video signal can be read out as often as required after the transmission time required for a picture via a digital-to-analog converter.

Bei diese« Verfahren ist kein Mechanisch bewegtes Teil vorhanden, zudem wird durch die Digitalisierung des Videosignals eine große übertragungssicherheit bis zu einen Signal-Rausch-Verhältnis von zwei erreicht. Dabei ist es besondere vorteilhaft, wenn das Videosignal mittels des Analog-Digital-Vandlers in ein PCM-Signal umgewandelt wird.In this «process there is no mechanically moving part, and the Digitization of the video signal ensures high transmission reliability up to a signal-to-noise ratio reached by two. It is particularly advantageous if the video signal is converted into a PCM signal by means of the analog-digital converter.

Die Erfindung soll an Hand eines AusfUhrungsbeispiels näher erläutert werden. In der Figur ist ein Blockschaltbild zur schmalbandigen übertragung eines Fernseheinzelbildes gezeigt. Das breitbandige Videosignal des zu übertragenden Fernseheinzelbildes gelangt über einen Eingang 1 zu einem Analog-Digital-Wandler 2, der das Analog-Signal in ein PCM-Signal verwandelt. Dabei richtet sich die Anzahl der bitsThe invention is intended to be based on an exemplary embodiment are explained in more detail. In the figure is a block diagram for the narrowband Transmission of a television frame shown. The broadband video signal of the to be transmitted Single TV picture arrives at an input 1 to an analog-to-digital converter 2, which converts the analog signal into a PCM signal. The number of bits depends on this

009887/0677009887/0677

BAD ORIG'NALBAD ORIG'NAL

Reg. Reg. lkkOlkkO - h -- H -

pro Bildpunkt nach der Anzahl der Graustufen, die zur Auewertung gelangen sollen. Dieses Digitalsignal wird nun in einem Magnetkernspeicher 3 gespeichert, wobei sich die notwendige Speicherkapazität nach der Anzahl der Bildpunkte und nach der Anzahl der zu übertragenden Graustufen richtet. Aus den Magnetkernspeicher 3 wird nun das Bild von einem "Langsam-Leeer" k mit einer der Übertragungskanalkapazität angepaßten langsamen bit-Folge herausgelesen, über den Schmalbandkanal 5 geschickt und auf der Empfangsseite in einen weiteren Magnetkernspeicher 6 eingeschrieben. Aus diesem kann es nach der fUr ein Bild notwendigen Übertragungszeit über den Digital-Analog-Vandler beliebig oft als ursprüngliches Videosignal über den Ausgang 8 herausgelesen werden.per pixel according to the number of gray levels that should be evaluated. This digital signal is now stored in a magnetic core memory 3, the necessary storage capacity depending on the number of pixels and the number of gray levels to be transmitted. The image of a "slow-empty" k with a slow bit sequence adapted to the transmission channel capacity is now read out of the magnetic core memory 3, sent over the narrowband channel 5 and written into a further magnetic core memory 6 on the receiving side. From this it can be read out as an original video signal via the output 8 as often as required after the transmission time necessary for an image via the digital-to-analog converter.

BAD ORIGINAL BATH ORIGINAL

009887/0677 - 5 -009887/0677 - 5 -

Claims (1)

Peg. " 5 " 1868739 Patentanspruch·Peg. "5" 1868739 claim · 1. Verfahren cub Übertragen eines Fernseheinselbildes Über einen Schmalbandkanal, vorzugsweise einen Telefonkanal, dadurch gekennzeichnet, daß das Videosignal des *u übertragenden Fernseheinzelbildes nach seiner Umwandlung ■ittels eines Analog-Digital-Vandlers (2) in ein Digitalsignal in einem Magnetkernspeicher (3) gespeichert und aus diesem mit einer der Übertragungskapazität angepaßten bit-Folge abgefragt wird, daß ferner das so entstehende langsame Digitalsignal Über den Schmalbandkanal (5) Übertragen wird und auf der Empfangsseite in einen weiteren Magnetkernspeicher (6) gelangt, aus dem das Videosignal nach der für ein Bild notwendigen Übertragungszeit Über einen Digital-Analog-Vandler (7) beliebig oft herausgelesen werden kann.1. Procedure cub Transmission of a television island image Via a narrow band channel, preferably a telephone channel, characterized in that the video signal of the * u transmitting TV frame after its conversion ■ by means of an analog-digital converter (2) into a digital signal in a magnetic core memory (3) stored and queried from this with a bit sequence adapted to the transmission capacity that the resulting slow digital signal via the narrowband channel (5) Is transmitted and on the receiving side in another magnetic core memory (6) arrives from which the video signal after the one for a picture necessary transmission time Read out as often as required using a digital-to-analog converter (7) can be. 2, Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Videosignal Mittel· de· Analog-Digital-Wandler· (2) in ein PCM-Signal umgewandelt wird.2, method according to claim 1, characterized in that the video signal means the analog-to-digital converter (2) is converted into a PCM signal. BAD ORIGINALBATH ORIGINAL 009887/0677009887/0677 Lee rse iteLee rse ite
DE19681808739 1968-11-14 1968-11-14 Method for transmitting a single television picture over a narrowband channel Pending DE1808739A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19681808739 DE1808739A1 (en) 1968-11-14 1968-11-14 Method for transmitting a single television picture over a narrowband channel
CH1482069A CH498537A (en) 1968-11-14 1969-10-01 Method for transmitting a television still picture over a narrow band channel
FR6938012A FR2023244A7 (en) 1968-11-14 1969-11-05
GB1251439D GB1251439A (en) 1968-11-14 1969-11-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681808739 DE1808739A1 (en) 1968-11-14 1968-11-14 Method for transmitting a single television picture over a narrowband channel

Publications (1)

Publication Number Publication Date
DE1808739A1 true DE1808739A1 (en) 1971-02-11

Family

ID=5713239

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19681808739 Pending DE1808739A1 (en) 1968-11-14 1968-11-14 Method for transmitting a single television picture over a narrowband channel

Country Status (4)

Country Link
CH (1) CH498537A (en)
DE (1) DE1808739A1 (en)
FR (1) FR2023244A7 (en)
GB (1) GB1251439A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2214365A1 (en) * 1972-03-24 1973-10-04 Licentia Gmbh BANDWIDTH-LIMITED IMAGE TRANSMISSION
DE2713823A1 (en) * 1977-03-29 1978-10-05 Volker Wraase Video signal converter system - changes video signal parameters digitally and accepts direct digital input from optical fibre system
DE3818336A1 (en) * 1988-05-30 1989-12-07 Licentia Gmbh REFRIGERATOR OR FREEZER WITH REFRIGERATION DISH

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2189957B1 (en) * 1972-06-22 1976-10-29 Cit Alcatel
FR2478414A1 (en) * 1980-03-14 1981-09-18 Le Squer Francois Time graded TV transmission system - uses memory to store video signals at arbitrary rate for transmission at proper rate to receiver carrying out reverse process
DE3113134A1 (en) * 1980-04-01 1982-01-21 Sanyo Electric Co., Ltd., Moriguchi, Osaka Still-frame recording and replay system
FR2621767A1 (en) * 1987-10-12 1989-04-14 Guichard Jacques SYSTEM FOR TRANSMITTING IMAGE AND SOUND

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2214365A1 (en) * 1972-03-24 1973-10-04 Licentia Gmbh BANDWIDTH-LIMITED IMAGE TRANSMISSION
DE2713823A1 (en) * 1977-03-29 1978-10-05 Volker Wraase Video signal converter system - changes video signal parameters digitally and accepts direct digital input from optical fibre system
DE3818336A1 (en) * 1988-05-30 1989-12-07 Licentia Gmbh REFRIGERATOR OR FREEZER WITH REFRIGERATION DISH

Also Published As

Publication number Publication date
CH498537A (en) 1970-10-31
GB1251439A (en) 1971-10-27
FR2023244A7 (en) 1970-08-07

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