GB655153A - Improvement in or relating to television receivers - Google Patents

Improvement in or relating to television receivers

Info

Publication number
GB655153A
GB655153A GB37431/46A GB3743146A GB655153A GB 655153 A GB655153 A GB 655153A GB 37431/46 A GB37431/46 A GB 37431/46A GB 3743146 A GB3743146 A GB 3743146A GB 655153 A GB655153 A GB 655153A
Authority
GB
United Kingdom
Prior art keywords
carrier
picture
frequency
signals
sound
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
GB37431/46A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB655153A publication Critical patent/GB655153A/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
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • H04N5/62—Intercarrier circuits, i.e. heterodyning sound and vision carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Television Systems (AREA)

Abstract

655,153. Multiplex radio signalling. BURGESS, A. F. (Parker,. L. W.). Dec. 19, 1946, No. 37431. [Class .40 (v)] [Also in Group XL (b)] A television receiver is provided with a selecting circuit preceding the detector and having a frequency characteristic such that both picture and sound carriers are passed to the detector. The detector demodulates the picture carrier, and mixes the two carriers so as to produce a beat frequency carrier for the sound signals. This arrangement ensures that unwanted interaction between the amplitude modulated picture signals and the frequency modulated sound signals is substantially eliminated. Fig. 1 shows a response curve for a receiver which passes both picture and sound carriers P, S to the detector, but in which the sound carrier operates near the bottom of the upper end of the response curve where the slope is substantially zero. In this manner the frequency modulated signals have little effect on the picture signals and if the amplitude of the sound carrier is limited to about 5 per cent of the picture carrier, a 90 per cent modulation of the picture carrier has no appreciable effect on the sound signals. Fig. 4 shows an idealized acceptance curve for the receiver, the sound signals being a frequency modulation on a carrier 4.5 Mc/s. higher than the carrier frequency of the amplitude modulated picture signal P. Both signals are fed to the detector the interaction of the two carrier frequencies produces a beat frequency of 4.5 Mc/s. Since the curve has zero slope at the point S only the picture signals will be detected and passed to a video amplifier, the sound signals being passed on to a frequency discriminator as a frequency modulation of the 4.5 Mc/s. beat frequency. The frequency characteristic of the selecting circuit may be made to correspond nearly to the idealized curve of Fig. 4 by combining the curves X and Y (Fig. 3). As shown in Fig. 5, the curve is derived by means of a broad band I.F., or R.F., coupling comprising inductance 21 and 24 between two valves 20 and 27 preceding the detector stage, and the curve Y is derived by means of an additional inductance 30 shunted by a resistor 31 and condenser 32 coupled to the I.F. or R.F. coupling.
GB37431/46A 1944-07-13 1946-12-19 Improvement in or relating to television receivers Expired GB655153A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US544726A US2448908A (en) 1944-07-13 1944-07-13 Television receiver

Publications (1)

Publication Number Publication Date
GB655153A true GB655153A (en) 1951-07-11

Family

ID=10396433

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37431/46A Expired GB655153A (en) 1944-07-13 1946-12-19 Improvement in or relating to television receivers

Country Status (6)

Country Link
US (1) US2448908A (en)
BE (1) BE490426A (en)
DE (1) DE970147C (en)
FR (1) FR952903A (en)
GB (1) GB655153A (en)
NL (1) NL74381C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977272C (en) * 1953-06-30 1965-09-09 Loewe Opta Ag Multi-standard television receiver based on the differential carrier method

Families Citing this family (30)

* Cited by examiner, † Cited by third party
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US2563448A (en) * 1951-08-07 Subscription type signaling system
US2516889A (en) * 1939-06-03 1950-08-01 Standard Telephones Cables Ltd Converter system
US2505843A (en) * 1945-06-04 1950-05-02 Philco Corp Television receiver
US2498488A (en) * 1946-06-14 1950-02-21 Gen Electric Television intercarrier or sound receiver circuit
BE481328A (en) * 1946-06-26
NL136716C (en) * 1946-12-10
FR960109A (en) * 1947-01-24 1950-04-13
US2629822A (en) * 1947-01-31 1953-02-24 Motorola Inc High-frequency coupling circuits
US2637809A (en) * 1947-11-01 1953-05-05 Rauland Corp Coupling for frequency modulation discriminators
US2562703A (en) * 1947-12-26 1951-07-31 Gen Electric Multiple channel radio receiving system
US2628275A (en) * 1948-02-25 1953-02-10 Louis W Parker Radio and television distribution system for hotels and apartment houses
US2632047A (en) * 1948-06-11 1953-03-17 Motorola Inc Television gain control system
US2528222A (en) * 1948-12-29 1950-10-31 Gen Electric Combination television and frequency modulation receiver
US2652447A (en) * 1949-01-19 1953-09-15 Bendix Aviat Corp Sound separation means for carrier frequency difference television receivers
US2634329A (en) * 1949-01-21 1953-04-07 Carlton E Bessey Intercarrier-video type television receiver
US2632800A (en) * 1949-03-26 1953-03-24 Motorola Inc Noise squelch system for television receivers
US2584332A (en) * 1949-08-19 1952-02-05 Motorola Inc Video amplifier having variable gain and variable band width
US2686221A (en) * 1949-11-03 1954-08-10 Rca Corp Simplified compbination fm and television receiver
US2650265A (en) * 1949-11-30 1953-08-25 Stromberg Carlson Co Dual purpose carrier wave receiver
US2677049A (en) * 1950-07-15 1954-04-27 Rca Corp Automatic frequency control
US2712569A (en) * 1951-03-03 1955-07-05 Robert S Mautner Television receiver
DE928473C (en) * 1951-04-05 1955-06-02 Blaupunkt Werke Gmbh Television receiver
DE931113C (en) * 1952-01-26 1955-08-01 Fernseh Gmbh Receiver for double modulated carrier shafts
NL100377C (en) * 1953-03-11
US2875274A (en) * 1953-10-07 1959-02-24 Westinghouse Electric Corp Television receiver apparatus
US2910530A (en) * 1955-11-07 1959-10-27 Philco Corp System for discriminatory signal carrier identification
US2886633A (en) * 1956-07-30 1959-05-12 Motorola Inc Television receiver
US2860178A (en) * 1956-08-10 1958-11-11 Wolfe Benjamin Multiplex transmission of intelligence
DE1258447B (en) * 1957-10-07 1968-01-11 Saba Gmbh Circuit arrangement for automatic reception tuning for television receivers operating according to the differential carrier method
US3020403A (en) * 1957-10-29 1962-02-06 Gen Electronic Lab Inc Anti-capture signal receiving apparatus

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL11057C (en) * 1921-03-03
US1495470A (en) * 1922-02-01 1924-05-27 Western Electric Co High-frequency transmission
GB225553A (en) * 1923-11-28 1925-05-28 Westinghouse Electric & Mfg Co Improvements in and relating to television systems
US1811102A (en) * 1924-09-10 1931-06-23 Western Electric Co Signal transmission by guided and unguided waves
US1735134A (en) * 1925-05-23 1929-11-12 Drahtlose Telegraphie Gmbh Method and system for constant-frequency beat reception of radiosignals
US1807510A (en) * 1926-08-07 1931-05-26 Edward F Colladay Silent wave radio transmission system
US1797317A (en) * 1928-12-20 1931-03-24 American Telephone & Telegraph Binaural phase-discrimination radio system
NL48119C (en) * 1930-05-21
US1944119A (en) * 1930-05-27 1934-01-16 Rca Corp Convertible band pass receiver
DE580080C (en) * 1930-08-06 1933-07-05 Lorenz Akt Ges C Broadcasting system
AT129549B (en) * 1930-10-17 1932-08-25 Hans Dr Thirring Method of telegraphing and telephoning by means of electrical waves.
US2257562A (en) * 1933-04-08 1941-09-30 Rca Corp Intelligence transmission system
US2056607A (en) * 1934-06-28 1936-10-06 Rca Corp Sound and television receiver
US2164745A (en) * 1934-10-31 1939-07-04 Rca Corp Intermediate frequency amplifier
US2118610A (en) * 1935-01-29 1938-05-24 Rca Corp Signaling system
NL49976C (en) * 1936-11-03
US2234461A (en) * 1937-07-03 1941-03-11 Nat Television Corp Method and apparatus for controlling the frequency band width of coupled circuits
DE724217C (en) * 1938-12-23 1942-08-21 Fernseh Gmbh Overlay receiver with a special overlay whose mixing tubes act as a rectifier
US2270539A (en) * 1940-04-18 1942-01-20 Hazeltine Corp Intertube intermediate-frequency coupling system
DE893063C (en) * 1942-07-11 1953-10-12 Lorenz C Ag Method used for determining azimuthal direction using a rotary radio beacon

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977272C (en) * 1953-06-30 1965-09-09 Loewe Opta Ag Multi-standard television receiver based on the differential carrier method

Also Published As

Publication number Publication date
NL74381C (en)
FR952903A (en) 1949-11-28
US2448908A (en) 1948-09-07
DE970147C (en) 1958-08-21
BE490426A (en)

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