DE685918C - Device for electrical remote transmission of the average image brightness for film images - Google Patents

Device for electrical remote transmission of the average image brightness for film images

Info

Publication number
DE685918C
DE685918C DER97973D DER0097973D DE685918C DE 685918 C DE685918 C DE 685918C DE R97973 D DER97973 D DE R97973D DE R0097973 D DER0097973 D DE R0097973D DE 685918 C DE685918 C DE 685918C
Authority
DE
Germany
Prior art keywords
image brightness
average image
remote transmission
film images
electrical remote
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.)
Expired
Application number
DER97973D
Other languages
German (de)
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of DE685918C publication Critical patent/DE685918C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/36—Scanning of motion picture films, e.g. for telecine
    • H04N3/40—Scanning of motion picture films, e.g. for telecine with intermittently moving film
    • H04N3/405—Scanning of motion picture films, e.g. for telecine with intermittently moving film with film moving only during the field blanking interval
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/24—Blanking circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control
    • H04N5/53—Keyed automatic gain control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Synchronizing For Television (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimiles In General (AREA)

Description

Zur Übertragung der mittleren Bildhelligkeit ist es bekannt, eine besondere Photozelle zu verwenden, auf welche das ganze fernzuübertragende Bild dauernd projiziert wird. Dies erfordert jedoch ein besonderes Objektiv neben demjenigen, welches das fernzuübertragende Bild auf den Bildzerleger abbildet. A special photocell is known to transmit the average image brightness to use, on which the entire image to be transmitted remotely is continuously projected. However, this requires a special one Objectively next to that which images the image to be remotely transmitted onto the image splitter.

Gemäß der Erfindung kann nun für die Fernübertragung von Filmbildern bei Benutzung eines speichernden Kathodenstrahlbildabtasters, auf den während der Bildwechselbzw, beim Zeilensprungverfahren während der Zeilenzugwechselpause die Filmbilder mittels einer umlaufenden Blendenscheibe intermittierend projiziert werden, die obenerwähnte, im allgemeinen notwendige besondere optische Einrichtung, z.B. ein zusätzliches Objektiv, zur Erfassung der mittlerenAccording to the invention can now be used for long-distance transmission of film images when using a storage cathode ray scanner, on the during the picture change or, in the case of the interlace procedure, during the Line change pause the film frames are intermittent by means of a rotating diaphragm are projected, the above-mentioned, generally necessary special optical device, for example an additional one Lens, for capturing the middle

ao Bildhelligkeit entbehrt werden. Das wird dadurch erreicht, daß das von der Blendenscheibe reflektierte Licht der für die mittlere Bildhelligkeit bestimmten Photozelle zugeführt wird.ao image brightness are lacking. This is achieved by removing that from the diaphragm The reflected light is fed to the photocell intended for the medium image brightness will.

Eine Ausführungsform der Erfindung ist in der Zeichnung schematisch veranschaulicht. Der Filmstreifen 38 wird durch die Gleitkufen 48 am Bildfenster mittels des Malteserkreuzantriebs 50 vorbeibewegt. Der Antrieb hierfür erfolgt durch einen Synchronmotor 46. Das Licht der Bogenlampe 52 fällt durch den Filmstreifen hindurch; durch das Objektiv 220 wird jedes Filmbild auf den Kathodenstrahlbildabtaster 10, dessen Speicherfläche mit 14 und dessen Kathodenstrahl mit 20 bezeichnet ist, abgebildet. Diese Abbildung findet jedoch nur in den Bildwechselbzw. Zeilenzugwechselpausen statt, d. h. in denjenigen Zeiten, in denen der Kathodenstrahl in der zur Richtung der Bildzeilen senkrechten Richtung wieder in seine Anfangslage zurückbewegt wird. Dies wird durch die Blendenscheibe 40 erreicht, deren Öffnungen 42 und 44· die Filmprojektion nur während der erwähnten Bildwechsel- bzw. Zeilenzugwechselpausen zulassen. In derjenigen Zeit, in welcher die Blendenscheibe 40 den Projektionsstrahlengang sperrt, erfolgt die Abtastung des Schirmes im Kathodenstrahlbildabtaster sowie das Weiterrücken des Films im Projektor. Während dieser Zeit wird nun das auf die Blendenscheibe 40 auffallende Licht reflektiert; es erreicht dabei zum Teil die Photozelle 200, so daß also der von dieser Photozelle gelieferte Strom der mittleren Helligkeit des jeweiligen Filmbildes proportional ist. In dem Verstärker 202 wird der Photozellenstrom verstärkt und sodann in beliebiger, hier nicht näher interessierender Weise den vom Kathodenstrahlbildabtaster gelieferten und anschließend verstärkten Strömen zum Zwecke der Fernübertragung hinzugefügt. Bei der beschriebenen Anordnung ist demnach nur ein einziges Objektiv 220, welches zur Abbildung der Filmbilder auf den Kathodenstrahlbildabtaster dient, notwendig, also nicht noch ein besonderes Objektiv für die Erfassung der mittleren Bildhelligkeit in der Photozelle 200.One embodiment of the invention is illustrated schematically in the drawing. The filmstrip 38 is through the Skids 48 moved past the picture window by means of the Geneva drive 50. The drive this is done by a synchronous motor 46. The light from the arc lamp 52 falls through the filmstrip; through the lens 220 each film frame is on the Cathode ray scanner 10, the storage area with 14 and the cathode ray is designated by 20, shown. This figure only found in the image change or Line train breaks take place, d. H. in those times when the cathode ray is perpendicular to the direction of the image lines Direction is moved back to its starting position. This is done through the orifice plate 40 reached, the openings 42 and 44 · the film projection only during the Allow the pauses in the picture change or line change pauses mentioned. At that time when the diaphragm 40 blocks the projection beam path, the scanning of the takes place Screen in the cathode ray scanner as well as the advancement of the film in the projector. During this time, the light incident on the diaphragm disk 40 is reflected; it partially reaches the photocell 200, so that the current supplied by this photocell is of average brightness is proportional to the respective film image. In the amplifier 202 the photocell current is amplified and then in any way, which is not of further interest here, that of the cathode ray scanner supplied and subsequently amplified currents for the purpose of long-distance transmission. In the The arrangement described is therefore only a single lens 220, which is used for imaging the film images on the cathode ray scanner is used, necessary, so not yet another Special lens for recording the average image brightness in the photocell 200.

Claims (1)

Patentanspruch:Claim: Einrichtung zur elektrischen Fernübertragung der mittleren Bildhelligkeit bei Filmbildern, die durch eine Blendenscheibe hindurch während der Bildwechsel- bzw. Zeilenzugwechselpausenauf einen speichern1-den Kathodenstrahlbildabtaster projiziert werden, dadurch gekennzeichnet, daß das von der Blendenscheibe reflektierte Licht auf eine zur Erfassung der mittleren Bildhelligkeit dienende Photozelle fällt.Device for the electrical remote transmission of the average image brightness in film images, which are projected through an aperture plate during the image change or line train change pauses onto a storage 1 -d cathode ray scanner, characterized in that the light reflected by the aperture plate onto a photocell serving to detect the average image brightness falls. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DER97973D 1934-05-29 1935-05-30 Device for electrical remote transmission of the average image brightness for film images Expired DE685918C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US728147A US2192121A (en) 1934-05-29 1934-05-29 Television system and the method of operation thereof

Publications (1)

Publication Number Publication Date
DE685918C true DE685918C (en) 1939-12-29

Family

ID=24925611

Family Applications (3)

Application Number Title Priority Date Filing Date
DER93472D Expired DE716028C (en) 1934-05-29 1935-05-30 Synchronization process for television pictures transmitted according to the interlaced process
DER97973D Expired DE685918C (en) 1934-05-29 1935-05-30 Device for electrical remote transmission of the average image brightness for film images
DER95917D Expired DE714155C (en) 1934-05-29 1936-03-26 Interlaced television transmission method for images with an even number of lines and two lines per image

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DER93472D Expired DE716028C (en) 1934-05-29 1935-05-30 Synchronization process for television pictures transmitted according to the interlaced process

Family Applications After (1)

Application Number Title Priority Date Filing Date
DER95917D Expired DE714155C (en) 1934-05-29 1936-03-26 Interlaced television transmission method for images with an even number of lines and two lines per image

Country Status (6)

Country Link
US (1) US2192121A (en)
BE (5) BE424847A (en)
DE (3) DE716028C (en)
FR (1) FR790492A (en)
GB (1) GB448065A (en)
NL (1) NL44375C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB448066A (en) * 1934-08-31 1936-06-02 Edward Cecil Cork Improvements in or relating to synchronising means for television and like purposes
DE756078C (en) * 1935-04-24 1953-03-16 Emi Ltd Circuit arrangement for generating a pulse train with at least two groups of pulses of different frequencies
DE959375C (en) * 1937-07-22 1957-03-07 Telefunken Gmbh Circuit arrangement for synchronizing a process by means of pulses, in particular for television purposes
DE1032314B (en) * 1938-06-03 1958-06-19 Loewe Opta Ag Separation device for filtering out the line change and line change synchronizing pulses in television receivers
US2415390A (en) * 1941-09-30 1947-02-04 Crosley Corp Intermittent motion device
US2513176A (en) * 1943-02-24 1950-06-27 John H Homrighous Stereoscopic television system
US2521009A (en) * 1943-02-24 1950-09-05 John H Homrighous Television system
US2548900A (en) * 1946-06-12 1951-04-17 Sperry Corp Data presentation apparatus
US2570249A (en) * 1947-03-29 1951-10-09 Sperry Corp Combining and separating circuits
US2625602A (en) * 1947-06-26 1953-01-13 Rca Corp Film pulldown mechanism for television
DE973317C (en) * 1948-04-17 1960-01-21 L Outil R B V Et De La Radio I Television arrangement

Also Published As

Publication number Publication date
US2192121A (en) 1940-02-27
DE716028C (en) 1942-01-12
BE424847A (en)
BE414635A (en)
NL44375C (en)
GB448065A (en) 1936-06-02
FR790492A (en) 1935-11-21
DE714155C (en) 1941-11-22
BE434568A (en)
BE409634A (en)
BE414088A (en)

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