US2226992A - Picture receiving system - Google Patents

Picture receiving system Download PDF

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Publication number
US2226992A
US2226992A US756125A US75612534A US2226992A US 2226992 A US2226992 A US 2226992A US 756125 A US756125 A US 756125A US 75612534 A US75612534 A US 75612534A US 2226992 A US2226992 A US 2226992A
Authority
US
United States
Prior art keywords
potential
tube
impulses
circuit
cathode
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
US756125A
Other languages
English (en)
Inventor
Schlesinger Kurt
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.)
LOEWE RADIO Inc
Original Assignee
LOEWE RADIO Inc
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 LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2226992A publication Critical patent/US2226992A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H04B1/1623—Supply circuits using tubes
    • 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
    • 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
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • 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

Definitions

  • the subject matter of the present invention is an arrangement forthe synchronising of electrical apparatus, especially television arrangements using relaxation oscillation generators.
  • the subject matter of the invention is an ad- 25 ditional development of this arrangement.
  • a hot-cathode tube having a filling of gas, the gas pressure preferably being selected such that the discharge current traversing the valve immediately develops its full strength after the ignition potential is reached (approximately 10- 10" mm. noble gas).
  • FIG 1 shows one form of the present invention
  • Figure 2 shows a modified form of the present 40 invention.
  • I is the audion stage.
  • the ultra-audion with freely oscillating grid coil 2 and twin-grid tube 3 set forth by the applicant in the application Ser. No. 747,011.
  • I may accordingly be selected at 2 10 m. f. and the resistance 8 at 70,000 ohms.
  • the particular advantage when using the gasfilling according to the invention consists in the fact that the discharge current traversing the tube 9 develops its full force immediately upon the ignition potential being surpassed, which potential is extremely precisely defined and amounts to approximately volts, whereas in the case 20 of high-vacuum tubes the anode current has a preparatory range of a curved nature which is subject to space charge.
  • the resistance of the glow lamp 9 may accordingly be ignored after the commencement of the ignition, so that the resistance of the total current path is represented in substance merely by the inner resistance of 3 in parallel with the small anode resistance 4 and the condenser l. comparatively strong currents are accordingly obtained immediately the ignition value has been exceeded.
  • the response potential of 9 is regulated by a variable bias I 0.
  • the response potential is so, adjusted that the same does not appreciably exceed the highest nega- 5 tive image potential occurring in practice. The same is dependent, therefore, on the sensitiveness of the television ,tubeemployed, and when using the modern television tubes at present employedin practice may be adjusted at approximately 15 volts.
  • the amount of negative bias suppplied by the battery l0 should be selected accordingly in such fashion that by reason of the bias the difference is compensated between.
  • the ionisation potential (ignition. potential) of the tube 9 and the desired response potential. Owing to the use of glow lamps it is possible,
  • the impulse current components for synchronisation purposes which takes place by means of the transformers H for the short-line impulse and I2 for the long imageechange impulse, to charge a suitably selected condenser not only to the D. C. mean value but also to the peak value of the synchronisation impulse, from which merely the potential value of the commencing ignition is deducted.
  • a suitably selected condenser not only to the D. C. mean value but also to the peak value of the synchronisation impulse, from which merely the potential value of the commencing ignition is deducted.
  • the circuit 'l3/l4 is preferably so adjusted that the same possesses a time constant of 'at least one line period or more.
  • the direct potential thus obtained which is an automatic volume or gain potential is conducted over the line It simultaneously to as many amplifier tube grids as may be possible in the receiver dependent'on the connection system. In this manner the bias necessary to compensate fading may be considerably reduced.
  • the receiver contains merely few amplifier tubes, it is possible under certain circumstances according to the invention to provide a special D. C. amplifier tube for increasing the regulating potential.
  • a filter chain of this nature may consist, for example, of a resistance l! of approximately I0 ohms and a condenser l8 of approximately Ill mf.
  • the same may also be constructed as a multiple member chain, and in accordance with the invention should preferably always be so dimensioned that its resulting oscillation initiation period does not considerably surpass a-few line periods.
  • a television receiving system including means to demodulate a carrier signal to produce a composite series of picture and synchronizing signalswith the synchronizing signals extending in a negative direction and having an intensity greater than any picture signals, a discharge tube havinga cathode'and an anode, a load circuit, means for connecting one end of the load circuit to the anode of said tube, a time constant circuit including a parallel connected condenser and resistance, means for connecting one end of the time constant circuit to a point of fixed potential, means for connecting the other end of the time constant circuit.
  • a television receiving system including means to demodulate a carrier signal to produce a composite series of picture and synchronizing signals with the synchronizing signals extending in a negative direction. and having an intensity greater than any picture signal including black, a gaseous discharge tube having a cathode and an output electrode, a load circuit including means responsive to synchronizing signals, means for connecting one end of the load circuit to the output electrode of said tube, a time constant circuit including a condenser and a resistance connected in parallel, means for connecting one end of the time constant circuit to a point of ages will be produced at the junction of the time constant circuit and the load'circuit to compensate for fading and variations in the strength of the received carrier signals when such variations exceed a ratio of at least five to one.
  • a television receiving system including means to demodulate a carrier signal to produce a composite series of picture and synchronizing signals with the synchronizing signals extending in a-negative direction and having an intensity greater than any picture signals, a discharge tube having a cathode and an anode, a load circuit including means responsive to synchronizing signals, means for connecting one end of the load circuit to the anode of said tube, a time constant circuit including a parallel combination of a condenser and a resistance, means for connecting one end of the time constant circuit to ground potential, means fior connecting the other end of the time constant circuit to the other end of the load circuit, means including a condenser for impressing the produced series of composite signals upon the cathode of said tube, means including a source of potential and the time constant circuit for normally biasing the cathode with respect to ground potential and accordingly with respect to said anode, by an amount surficient to normally prevent appreciable conduction of the tube except when signals of the intensity of synchronizing signals are applied to the cathode

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)
  • Picture Signal Circuits (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Synchronizing For Television (AREA)
  • Television Systems (AREA)
US756125A 1933-10-11 1934-12-05 Picture receiving system Expired - Lifetime US2226992A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE445428X 1933-10-11
DE2226992X 1933-12-06
DE2163215X 1934-04-06

Publications (1)

Publication Number Publication Date
US2226992A true US2226992A (en) 1940-12-31

Family

ID=32073686

Family Applications (2)

Application Number Title Priority Date Filing Date
US756125A Expired - Lifetime US2226992A (en) 1933-10-11 1934-12-05 Picture receiving system
US14846A Expired - Lifetime US2163215A (en) 1933-10-11 1935-04-05 Television transmitter

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14846A Expired - Lifetime US2163215A (en) 1933-10-11 1935-04-05 Television transmitter

Country Status (5)

Country Link
US (2) US2226992A (no)
BE (3) BE395149A (no)
FR (6) FR773649A (no)
GB (6) GB441761A (no)
NL (3) NL44585C (no)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254204A (en) * 1936-05-15 1941-09-02 Emi Ltd Television system
DE741786C (de) * 1936-07-17 1943-11-17 Opta Radio Ag Fernsehabtastanordnung, bei welcher der das Bild abtastende Lichtstrahl auch zur Synchronisierzeichenerzeugung dient
DE755948C (de) * 1937-01-09 1955-07-28 Opta Radio A G Amplitudensiebschaltung fuer die Trennung von Bildinhaltssignalen und Synchronisierzeichen beim Fernsehen
DE757397C (de) * 1937-03-18 1952-12-01 Emi Ltd Schaltung zur Abtrennung von Teilen eines zeitlich schwankenden Spannungsverlaufs
DE882252C (de) * 1938-11-10 1953-07-06 Telefunken Gmbh Schaltung zur Abnahme der Steuerspannungen fuer die Zeilen- und Zeilenzugablenkung in Fernsehempfaengern
DE742435C (de) * 1938-12-25 1943-12-03 Fernseh Gmbh Anordnung zur Trennung der Zeilen- und Bildwechselimpulse gleicher Amplitude, aber unterschiedlicher Dauer und Frequenz, beim Fernsehen
US2532799A (en) * 1944-08-01 1950-12-05 Rca Corp Facsimile system having rotating scanner moving longitudinally within stationary transparent drum
NL74227C (no) * 1948-09-11
AU3412095A (en) 1994-08-26 1996-03-22 Kensington Microware Limited Security device for a portable computer
US6662602B1 (en) 1996-11-08 2003-12-16 Acco Brands, Inc. Security device for a portable computer

Also Published As

Publication number Publication date
FR46082E (fr) 1936-02-15
FR45574E (fr) 1935-10-17
GB445428A (en) 1936-04-09
GB453463A (en) 1936-09-07
GB466571A (en) 1937-05-31
GB459602A (en) 1937-01-06
FR779533A (fr) 1934-04-08
GB451578A (en) 1936-08-05
NL44585C (no)
BE412530A (no)
BE395149A (no)
US2163215A (en) 1939-06-20
GB441761A (en) 1936-01-22
NL43702C (no)
BE405608A (no)
FR773649A (fr) 1934-11-22
FR46739E (fr) 1936-08-10
NL45395C (no)
FR46290E (fr) 1936-04-08

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