US2289914A - Television system - Google Patents

Television system Download PDF

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Publication number
US2289914A
US2289914A US565226A US56522631A US2289914A US 2289914 A US2289914 A US 2289914A US 565226 A US565226 A US 565226A US 56522631 A US56522631 A US 56522631A US 2289914 A US2289914 A US 2289914A
Authority
US
United States
Prior art keywords
picture
synchronizing
signals
detector
holes
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 - Lifetime
Application number
US565226A
Other languages
English (en)
Inventor
Kell Ray Davis
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
Priority to BE371659D priority Critical patent/BE371659A/xx
Priority to NL39554D priority patent/NL39554C/xx
Priority to BE377922D priority patent/BE377922A/xx
Priority to BE398015D priority patent/BE398015A/xx
Priority to BE387822D priority patent/BE387822A/xx
Priority to NL61555D priority patent/NL61555B/xx
Priority to BE393588D priority patent/BE393588A/xx
Priority to FR741099D priority patent/FR741099A/fr
Priority to BE391266D priority patent/BE391266A/xx
Priority to BE395907D priority patent/BE395907A/xx
Priority to BE390958D priority patent/BE390958A/xx
Priority to BE390395D priority patent/BE390395A/xx
Priority to BE389285D priority patent/BE389285A/xx
Priority to BE396560D priority patent/BE396560A/xx
Priority to BE371688D priority patent/BE371688A/xx
Priority to US433338A priority patent/US1955332A/en
Priority to FR699544D priority patent/FR699544A/fr
Priority to FR39840D priority patent/FR39840E/fr
Application filed by RCA Corp filed Critical RCA Corp
Priority to US565226A priority patent/US2289914A/en
Priority to US607730A priority patent/US2246918A/en
Priority to US627565A priority patent/US2107464A/en
Priority to DER88507D priority patent/DE683957C/de
Priority to DER85803D priority patent/DE755140C/de
Priority to GB25079/32A priority patent/GB408656A/en
Priority to GB15496/33A priority patent/GB401990A/en
Priority to DER88042D priority patent/DE648195C/de
Priority claimed from GB2537433A external-priority patent/GB413894A/en
Application granted granted Critical
Publication of US2289914A publication Critical patent/US2289914A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/39—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as an amplifier
    • H03K4/43—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as an amplifier combined with means for generating the driving pulses
    • 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
    • H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
    • H04N3/04—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving aperture also apertures covered by lenses
    • 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
    • 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
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
    • H04N3/237—Distortion correction, e.g. for pincushion distortion correction, S-correction using passive elements, e.g. diodes
    • 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
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/34—Elemental scanning area oscillated rapidly in direction transverse to main scanning direction
    • 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
    • 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
    • H04N5/0675—Arrangements or circuits at the transmitter end for mixing the synchronising signals with the picture signal or mutually
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3147—Multi-projection systems

Definitions

  • This invention relates to improvements in television systems.
  • One of the objects of my invention is to provide an improved television system wherein the degree of background brilliancy of the reproduced picture is faithfully varied automatically in accordance with variations in the intensity of the received picture signals.
  • FIG. 1 The system shown in Fig. 1 is of the same general type as that described in detail in the copending application of Arthur W. Vance, Serial No. 544,959, filed June 17, 1931, now Patent 2,137,039, issued November 15, 1938.
  • a suitable'l radio kreceiver I supplies picture signals to a resistor II from which these signals are applied to the control grid I2 of a cathode ray tube I3.
  • a generator I6 picture bears a definite relation to the amplitude of the' picture signals developed during scanning action at the transmitting station.
  • the brilliancy of the picture background is faithfully reproduced at the receiving station by making the' direct current or background component of the picture signals proportional to the area of the same in the white'direction.
  • the received picture signals are applied to the grid of a condenser grid-leak detector to cause the voltage in the plate circuit to vary inversely proportionally to the area of the picture signals in the white direction.
  • a background component of lthe picture is then re-introduced Into Ithe control circuit of the receiving apparatus such, for example, as the grid circuit of a cathode ray tube or a control circuit for a neon tube, by applying the plate voltage of the detector to the control circuit of the receiving apparatus.
  • Figure 1 is adiagrammatic view of a television receiving system embodying my invention
  • Figs. 2a, 2b, 2c, and 3 are graphical views illus- .trative of the principle of operation
  • Fig. 4 is a fragmentary view similar to Fig. 1, illustrating a modification of my invention
  • Fig. 5 is a diagrammatic view of a television transmitter which may be vemployed in a television system embodying my invention
  • Fig. 6 is avside elevational view of the scanning disc used at the transmitting station, lookx ing toward the left in Fig. 5;
  • Figs. '7 and 8 are enlarged fragmentary views looking toward the left in. Fig. 5;
  • synchronizing impulses are received at the end of each scanning-line period, 1200 of these impulses being received during each picture-frame period.
  • a single synchronizing impulse, received at the end of each picture-frame period is substantially greater in amplitude than the others.
  • the adjustment of the generator I6 is such that the same is not responsive to the peak picture signals, but is responsive to the synchronizing impulses 20 of substantially greater amplitude, as indicated in Fig. 2c.
  • the adjustment of the generator I8 is such that the same is responsive only to the single framing impulse which is substantially greater in amplitudeA than the peak picture signals, and the other synchronizing impulses 20.'
  • the cathode ray tube I3 is supplied with the usual operating potentials, as indicated.
  • is also supplied with the picture signals from the resistance II, as shown. 'Ihe'plate voltage of the detector 2
  • the received signals are as shown Vin Fig. 2b.
  • Vin Fig. 2b When these signals are applied to the grid circuit of the detector 2
  • are such that with no picture signal on the grid of the detector, the screen l is dark, that is, the cathode ray I4 is cut off.
  • the amount of space current flowing through the detector 2i Upon an increase in the picture signal intensity in the White direction, the amount of space current flowing through the detector 2i will decrease correspondingly in the Well known manner.
  • therefore, increases correspondingly and, since this voltage constitutes a bias on the control grid I2 of the cathode ray tube, the negative bias on ⁇ this tube will decrease to make the screen l5 correspondingly brighter.
  • upon an increase in picture signal strength in the positive or white direction, the detector 2
  • causes an increase in bias on the tube I3, thereby causing the screen I5 t0 be illuminated less brilliantly.
  • the adjustment as stated, is such that the ray I4 is cut off to make the screen I5 dark.
  • My invention may be embodied in any type of television receiving apparatus by reintroducing into the control circuit thereof the background component of the picture as provided by the detectorf 2
  • For example, Yif the receiver utilizes anejon tube25, as shown in Fig. 4,- the plate circuitjofjthe detector 2
  • the action is the same as that described in connection with Fig. 1, the overall brilliancyof the tube 25 varying directly proportionally to variations in the intensity of the received picture signals.
  • the disc 30 is provided, for example, with sixty scanning holes A1-Aso, spirally arranged in the usual manner.
  • the holes Afm, A1, and Az are plugged. as indicated. The reason for this will be hereinafter explained.
  • Light reflected from an object 35 excites a photoelectric cell 36,. ora bank of such cells, to develop picture signals which are amplified by an amplifier 3l and applied to the input line 38 of a second amplifier 39.
  • the ⁇ second amplifier 39 is connected, as shown, to a suitable-modulator 40 which controls a radio transmitter 4
  • the disc 30 ⁇ is provided at the outer edge thereof with concentrically arranged holes a1 to aso, through which light from a light source 42 passes to a photoelectric cell 43, as shown in Fig. 5.
  • a screen 44 provided with an aperture 45 substantially equal in Width to that of the synchronizing holes, is interposed between the disc 39 and the light source 42.
  • a lens 46 may be employed to focus the light on the photoelectric cell'.
  • the photoelectric cell 43 develops electrical impulses at a horizontal synchronizing frequency of r1200 cycles per second.
  • the impulses or signals at this frequency are amplified by a suitable amplifier 4l and are supplied directly to the input line 38 of the amplifier 39, in parallel with the amplied picture signals.
  • the width of the opening 48 in the mask 34 is made less than the circumferential distance between adjacent scanning holes, as shown in Fig. 7, to provide for periods during which no picture signals are transmitted.
  • the adjustment of the screen 44 is such that during thesel periods the synchronizing holes ai -to aan move, across the aperture 45.
  • the hole a1 in Figs. 6 and 8 is given the shape shown in Fig. 9. That is, the size and shape of the framing hole in Fig.v 9 is such that the same not only moves across aperture 45 for a longer period, but during such movement admits more light to the photoelectric cell 43 than the other synchronizing holes.
  • the number of stages in amplifiers 31 and 4l is such that the output voltage of amplifier 4l is 180 degrees out of phase with that of amplifier 31, an increase in light intensity on the picture cell 36 causing a corresponding increase, in theA positive sense, in the output voltage of amplifier 31. Therefore, when the synchronizing cell 43 is exposed to the light from source d2, there is a sharp increase, in the negative direction, in the output voltage of amplifier 67.
  • the synchronizing holes a1 to asn may be disposed on the inside of the scanning holes, if desired. It is also contemplated, if and when found desirable, to employ a separate disc for synchronizing purposes. In such case, the synchronizing disc would bedriven by motor 3
  • the scanning disc has been described as providing for 60 picture lines, it will be understood that the design may be varied to provide for more or less lines, as might be found desirable for particular conditions.
  • the scanning disc may be replaced by a scanning cylinder or other equivalent rotating means of well known construction. Ifv a scanning cylinder is used, the same may be provided with the synchronizing holes, or a separate cylinder may be employed for the synchronizing action, as explained above in connection with the disc construction.
  • the ampliers 31, 39 and 4U, and the usual power amplifier forming part of the radio transmitter are of any well known construction havlng the following desirable characteristics:
  • means comprising a cathode ray tube for reproducing a picture, an electron beam intensity control circuit for said tube, means connected to said circuit for supplying the same with picture signals, and a thermionic detector having its input circuit supplied with said signals to rectify them in accordance with their area on the white side of the alternating current axis and having its output circuit connected to said control circuit independently of the connection between said signal-supply means and said control circuit.
  • a television receiver comprising acathode ray tube having an electron beam intensity control electrode, means for applying picture signal over one path to said electrode for reproducing a view, means positioned in another path for rectifying said picture signal to produce a control voltage that varies in accordance with the area of said signal on the white side of its alternating an increase in said area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Details Of Television Scanning (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Picture Signal Circuits (AREA)
US565226A 1930-03-05 1931-09-26 Television system Expired - Lifetime US2289914A (en)

Priority Applications (26)

Application Number Priority Date Filing Date Title
BE377922D BE377922A (es) 1931-09-26
BE398015D BE398015A (es) 1931-09-26
BE387822D BE387822A (es) 1931-09-26
NL61555D NL61555B (es) 1931-09-26
NL39554D NL39554C (es) 1931-09-26
FR741099D FR741099A (es) 1931-09-26
BE391266D BE391266A (es) 1931-09-26
BE395907D BE395907A (es) 1931-09-26
BE390958D BE390958A (es) 1931-09-26
BE390395D BE390395A (es) 1931-09-26
BE389285D BE389285A (es) 1931-09-26
BE396560D BE396560A (es) 1931-09-26
BE371688D BE371688A (es) 1931-09-26
BE393588D BE393588A (es) 1931-09-26
BE371659D BE371659A (es) 1931-09-26
US433338A US1955332A (en) 1930-03-05 1930-03-05 View transmission system
FR699544D FR699544A (fr) 1931-09-26 1930-06-26 Système de transmission à distance d'images et autres objets
FR39840D FR39840E (fr) 1931-09-26 1931-03-04 Système de transmission à distance d'images et autres objets
US565226A US2289914A (en) 1931-09-26 1931-09-26 Television system
US607730A US2246918A (en) 1931-09-26 1932-04-27 Unidirectional scanning
US627565A US2107464A (en) 1931-09-26 1932-08-05 Television system
DER88507D DE683957C (de) 1931-09-26 1932-08-05 Empfangsanordnung fuer stereoskopisches Fernsehen
DER85803D DE755140C (de) 1931-09-26 1932-09-03 Fernsehempfangsschaltung zur Wiedereinfuehrung der mittleren Bildhelligkeit
GB25079/32A GB408656A (en) 1931-09-26 1932-09-08 Improvements in or relating to television and like systems
GB15496/33A GB401990A (en) 1931-09-26 1933-05-29 Improvements in or relating to television and like systems
DER88042D DE648195C (de) 1931-09-26 1933-05-30 Anordnung zur Erzeugung eines Stromes von saegezahnfoermigem Verlauf fuer die magnetische Ablenkung von Kathodenstrahlen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US565226A US2289914A (en) 1931-09-26 1931-09-26 Television system
US401990XA 1932-05-28 1932-05-28
GB2537433A GB413894A (en) 1933-09-13 1933-09-13 Improvements in or relating to television systems

Publications (1)

Publication Number Publication Date
US2289914A true US2289914A (en) 1942-07-14

Family

ID=31950339

Family Applications (1)

Application Number Title Priority Date Filing Date
US565226A Expired - Lifetime US2289914A (en) 1930-03-05 1931-09-26 Television system

Country Status (6)

Country Link
US (1) US2289914A (es)
BE (12) BE377922A (es)
DE (2) DE755140C (es)
FR (3) FR699544A (es)
GB (2) GB408656A (es)
NL (2) NL61555B (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548436A (en) * 1946-01-25 1951-04-10 Hazeltine Corp Television receiver background control circuit
US3293483A (en) * 1962-01-08 1966-12-20 Siemens Ag Radiation controlled electron radiation source

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE402568A (es) * 1933-04-13
DE741454C (de) * 1934-12-20 1943-11-11 Telefunken Gmbh Anordnung zur Erzeugung eines saegezahnfoermigen Stromverlaufs, insbesondere fuer die magnetische Ablenkung von Kathodenstrahlen fuer Oszillographen- und Fernsehzwecke
DE889309C (de) * 1935-02-06 1953-09-10 Telefunken Gmbh Schaltungsanordnung zur Erzeugung eines saegezahnfoermigen Stromverlaufs zur magnetischen Ablenkung von Kathodenstrahlen, insbesondere fuer Fernsehzwecke
DE763069C (de) * 1935-02-28 1953-02-09 Rca Corp Schaltungsanordnung zur Phasenverschiebung von Impulsen
DE755243C (de) * 1935-05-25 1954-12-13 Opta Radio A G Anordnung zur Ablenkung des Kathodenstrahls in Kathodenstrahlroehren durch langsame Aufladung und ploetzliche nicht-lineare Entladung eines Kondensators
DE1018098B (de) * 1935-08-06 1957-10-24 Fernseh Gmbh Anordnung zur Synchronisierung mehrerer Sendestellen von einer zentralen Stelle aus bei Fernseh- und Bilduebertragungen
BE418067A (es) * 1935-10-25
US2140004A (en) * 1936-02-03 1938-12-13 Rca Corp Electrical oscillation generator
GB479113A (en) * 1936-04-29 1938-01-31 Alan Dower Blumlein Improvements in or relating to thermionic valve circuits particularly for use in television
GB479760A (en) * 1936-08-10 1938-02-10 Baird Television Ltd Improvements in or relating to television and like systems
DE755117C (de) * 1936-09-15 1951-07-26 Fernseh Gmbh Anordnung zur Erzeugung einer Anodenspannung fuer Elektronen-strahlroehren durch Gleichrichtung einer zur elektromagnetischen Strahlablenkung dienenden Kippschwingung
DE755706C (de) * 1936-11-27 1954-11-29 Opta Radio A G Verfahren zur Erzeugung der Zeilen- und Bildwechselzeichen bei Fernsehsendern
DE741785C (de) * 1937-11-29 1943-11-17 Fernseh Gmbh Verfahren zur UEbertragung von Fernsehbildern, deren Helligkeitsumfang geringer ist als der zur Verfuegung stehende Modulationsbereich
DE741537C (de) * 1938-01-11 1943-11-12 Fernseh Gmbh Schaltanordnung zur selbsttaetigen Beseitigung der bei elektromagnetischer Strahlablenkung auftretenden Verzerrungen
DE758006C (de) * 1939-02-26 1953-02-16 Telefunken Gmbh Stromsaegezahngenerator mit einem Parallelresonanzkreis, der aus einer Ablenkspule und ihrer Eigenkapazitaet besteht, und einer transformatorisch spannungsrueckgekoppelten Roehre
DE756444C (de) * 1939-05-13 1953-01-19 Aeg Anordnung zum Linearisieren von aus Teilen einer Exponentialkurve bestehenden Kippschwingungen
US2564554A (en) * 1947-10-09 1951-08-14 Rca Corp Background control and synchronizing signal separating circuit
BE511213A (es) * 1950-06-25
DE1022683B (de) * 1953-01-08 1958-01-16 Cie Generale D Electricite Soc Verstaerker mit zeitlich veraenderlicher frequenzabhaengiger Verstaerkungs- und Phasendreh-Charakteristik
DE1274624B (de) * 1955-01-07 1968-08-08 Friedrich Herz Verfahren zur Ablenkung des Kathodenstrahles beim Fernsehen durch sinusfoermige Spannungen abgeleitete Zeilen- und Bildablenkspannungen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT113936B (de) * 1926-10-19 1929-08-10 Siemens Ag Einrichtung zur Amplitudenbegrenzung.
DE482874C (de) * 1927-01-03 1929-09-21 Gen Electric Empfangsanordnung fuer hochfrequente Signalstroeme mit automatischer Begrenzung der Signallautstaerke

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548436A (en) * 1946-01-25 1951-04-10 Hazeltine Corp Television receiver background control circuit
US3293483A (en) * 1962-01-08 1966-12-20 Siemens Ag Radiation controlled electron radiation source

Also Published As

Publication number Publication date
BE377922A (es)
BE398015A (es)
NL61555B (es)
BE391266A (es)
DE648195C (de) 1937-07-24
BE395907A (es)
BE393588A (es)
GB401990A (en) 1933-11-23
GB408656A (en) 1934-04-09
FR39840E (fr) 1932-03-24
BE371688A (es)
DE755140C (de) 1953-03-09
BE390395A (es)
FR699544A (fr) 1931-02-16
BE389285A (es)
NL39554C (es)
FR741099A (es) 1933-02-04
BE390958A (es)
BE371659A (es)
BE387822A (es)
BE396560A (es)

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