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GB586154A - Improvements in electric signal wave systems particularly for use in television systems and the like - Google Patents

Improvements in electric signal wave systems particularly for use in television systems and the like

Info

Publication number
GB586154A
GB586154A GB12424/43A GB1242443A GB586154A GB 586154 A GB586154 A GB 586154A GB 12424/43 A GB12424/43 A GB 12424/43A GB 1242443 A GB1242443 A GB 1242443A GB 586154 A GB586154 A GB 586154A
Authority
GB
United Kingdom
Prior art keywords
valve
input
july
signal strength
television
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
GB12424/43A
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.)
Philco Radio and Television Corp
Original Assignee
Philco Radio and Television 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 Philco Radio and Television Corp filed Critical Philco Radio and Television Corp
Publication of GB586154A publication Critical patent/GB586154A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

586,154. Amplitude selective circuits. PHILCO RADIO & TELEVISION CORPORATION. July 30, 1943, No. 12424. Convention date, July 31, 1942. [Classes 40 (iii) and 40 (v)] A circuit for separating synchronizing and picture signals in a television receiver comprises a valve 24, Fig. 1, which may be of beam type, which selects signals having amplitudes lying between certain limits and feeds them to the synchronizing circuits 20, and the characteristic on which the valve 24 operates is controlled in accordance with signal strength to vary both limits of selection. In the examples described, the control is effected at the screen grid of valve 24 which is coupled with the output circuit of valve 9 feeding valve 24 so as to be subject to slow variations transmitted to the control grid of tube 24 and not to rapid variations. The screen load of valve 9 is chosen to peak at a lower frequency than the anode load as described in Specification 530,319. Valve 9 may afford an output which is substantially independent of input, but may be arranged to select a portion of the input of which the magnitude varies with signal strength. In a modification (Fig. 3, not shown), a valve equivalent to valve 9, Fig. 1, has its effective anode and cathode potentials varied in accordance with the slow variations of the input to afford additional control of the tube characteristic.
GB12424/43A 1942-07-31 1943-07-30 Improvements in electric signal wave systems particularly for use in television systems and the like Expired GB586154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US453138A US2356141A (en) 1942-07-31 1942-07-31 Synchronizing circuit

Publications (1)

Publication Number Publication Date
GB586154A true GB586154A (en) 1947-03-10

Family

ID=23799348

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12424/43A Expired GB586154A (en) 1942-07-31 1943-07-30 Improvements in electric signal wave systems particularly for use in television systems and the like

Country Status (2)

Country Link
US (1) US2356141A (en)
GB (1) GB586154A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944798C (en) * 1949-10-19 1956-06-21 Emi Ltd Arrangement for controlling circuits through electron tubes

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597870A (en) * 1945-08-08 1952-05-27 Garold K Jensen Noise elimination system for pulse signal receivers
US2591088A (en) * 1945-11-30 1952-04-01 Us Navy Video blanking circuit
US2585883A (en) * 1946-08-10 1952-02-12 Rca Corp Combination second detector, noise limiter, and gain control circuit
US2566763A (en) * 1946-09-28 1951-09-04 Motorola Inc Synchronizing signal separator and keyed automatic gain control
US2652450A (en) * 1948-05-29 1953-09-15 Rca Corp Sync separation and automatic gain control
US2601191A (en) * 1948-09-18 1952-06-17 Rca Corp Television sync separator
US2637773A (en) * 1948-12-01 1953-05-05 Rca Corp Automatic gain control system
US2586760A (en) * 1948-12-01 1952-02-19 Rca Corp Combined amplitude and frequency discriminatory automatic gain control
US2656414A (en) * 1949-05-21 1953-10-20 Zenith Radio Corp Video-from-sync and sync-from-sync separator
US2706220A (en) * 1949-08-30 1955-04-12 Motorola Inc Delayed gated automatic gain control
US2631230A (en) * 1949-10-11 1953-03-10 Du Mont Allen B Lab Inc Circuit for minimizing the effects of noise in television signals
BE498896A (en) * 1949-10-29
US2680806A (en) * 1949-12-24 1954-06-08 Du Mont Allen B Lab Inc Noise reducing synchronization circuit
US2577868A (en) * 1950-05-04 1951-12-11 Avco Mfg Corp Video amplifier coupling network for television receivers
US2651675A (en) * 1950-06-08 1953-09-08 Avco Mfg Corp Plural time constant circuits for noise immunity
US2672505A (en) * 1950-06-13 1954-03-16 Avco Mfg Corp Black level shift compensating amplifier
US2743313A (en) * 1950-06-13 1956-04-24 Avco Mfg Corp Television signal gain as function of brightness
US2820092A (en) * 1950-11-30 1958-01-14 Rca Corp Television receiving systems
US2718550A (en) * 1950-11-30 1955-09-20 Rca Corp Combined direct current reinserter and variable threshold synchronizing signal separator
US2698358A (en) * 1950-11-30 1954-12-28 Rca Corp Video amplifier control by combined a. g. c. and d. c. voltages
US2637774A (en) * 1950-12-15 1953-05-05 Rca Corp Keyed noise-clipping circuit
US2736768A (en) * 1951-08-01 1956-02-28 Rca Corp Video from sync and sync from sync separator
US2717972A (en) * 1951-08-18 1955-09-13 Zenith Radio Corp Electron-discharge device
US2825756A (en) * 1951-11-15 1958-03-04 Gen Electric Automatic gain control of keyed automatic gain control amplifier
US2852602A (en) * 1952-02-16 1958-09-16 Gen Electric Noise elimination in television receiver utilizing noise inverter and amplifier
US2844649A (en) * 1953-04-15 1958-07-22 Motorola Inc Television receiver
US2872510A (en) * 1953-04-28 1959-02-03 Motorola Inc Television receiver
US2950342A (en) * 1954-06-28 1960-08-23 Gen Electric Signal separation circuits
GB840842A (en) * 1955-08-03 1960-07-13 Emi Ltd Improvements in or relating to automatic gain control circuits in television receivers
US2988594A (en) * 1958-05-07 1961-06-13 Zenith Radio Corp Contrast control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944798C (en) * 1949-10-19 1956-06-21 Emi Ltd Arrangement for controlling circuits through electron tubes

Also Published As

Publication number Publication date
US2356141A (en) 1944-08-22

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