GB634374A - Improvements in broadcasting systems - Google Patents

Improvements in broadcasting systems

Info

Publication number
GB634374A
GB634374A GB33423/46A GB3342346A GB634374A GB 634374 A GB634374 A GB 634374A GB 33423/46 A GB33423/46 A GB 33423/46A GB 3342346 A GB3342346 A GB 3342346A GB 634374 A GB634374 A GB 634374A
Authority
GB
United Kingdom
Prior art keywords
control
amplifier
derived
tone
valve
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
GB33423/46A
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 GB634374A publication Critical patent/GB634374A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/30—Arrangements for simultaneous broadcast of plural pieces of information by a single channel
    • H04H20/31—Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C23/00—Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/13—Arrangements for device control affected by the broadcast information

Abstract

634,374. Radio receiving circuits; radio signalling. ARMSTRONG, E. H. Nov. 11, 1946, No. 33423. Convention date, March 30. [Class 40 (v)] [Also in Group XXXIX] In a broadcasting system a supersonic tone is added to selected parts of the transmission, such as advertising matter, and the corresponding receivers are provided with means whereby these items are suppressed automatically or reproduced at a reduced level. The Figure shows a frequency-modulation receiver in which the first audio-frequency stage comprises a de-emphasis circuit 21, 22 and a pentode amplifier 24. The control tone is separated by a high-pass filter 32 and is applied over an amplifier and sharply-selective circuits 38 to a rectifier 40. A delay voltage is derived either as shown, from the cathode current of the amplifier 35 or by means of an adjustable potentiometer connected across the high-tension supply (Fig. 3, not shown). The rectified output is used to control the gain of the valve 24, being applied to the suppressor grid over a smoothing circuit and adjustable potentiometer 44. The control potential may also be applied to the grid by means of a switch 45, which may be arranged to come into operation when the potentiometer 44 is at maximum. A resistance 26 connected to the high-tension supply is utilized to stabilize the cathode bias of the valve 24. U.S.A. Specification 1,941,067 is referred to. According to the Specification as open to inspection under Sect. 91 the arrangement may be used' to give muting during tuning, the control then being derived from the noise present. This subject-matter does not appear in the Specification as accepted.
GB33423/46A 1946-03-30 1946-11-11 Improvements in broadcasting systems Expired GB634374A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US658403A US2602885A (en) 1946-03-30 1946-03-30 Radio signaling

Publications (1)

Publication Number Publication Date
GB634374A true GB634374A (en) 1950-03-22

Family

ID=24641105

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33423/46A Expired GB634374A (en) 1946-03-30 1946-11-11 Improvements in broadcasting systems

Country Status (4)

Country Link
US (1) US2602885A (en)
BE (1) BE472016A (en)
FR (1) FR942971A (en)
GB (1) GB634374A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719219A (en) * 1950-01-27 1955-09-27 Sundial Broadcasting Corp Radio receiver system
US2799734A (en) * 1952-04-04 1957-07-16 Melpar Inc Speech brighteners
US3020529A (en) * 1959-12-21 1962-02-06 Collins Radio Co Reflected power alarm for a variable power output antenna system
US3332021A (en) * 1963-11-22 1967-07-18 Mcmartin Ind Inc Selective frequency gate and signalling circuit
US3319169A (en) * 1963-11-27 1967-05-09 Bunker Ramo Radio receiving system including squelch means
US3448385A (en) * 1965-06-28 1969-06-03 Scott Inc H H Stereophonic receiver squelch apparatus
US3568068A (en) * 1967-10-13 1971-03-02 Motorola Inc Squelch circuit for frequency modulation receiver
US3513399A (en) * 1967-10-17 1970-05-19 Keith H Wycoff Tone control circuit
DE2902616C3 (en) * 1979-01-24 1982-01-14 Blaupunkt-Werke Gmbh, 3200 Hildesheim VHF receiver, especially car receiver, with field strength-dependent volume control
US5465406A (en) * 1994-09-06 1995-11-07 Ford Motor Company Automatic gain control overshoot limiter for AM receiver

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2061982A (en) * 1929-03-30 1936-11-24 Rca Corp Automatic sensitivity reduction system
US1988614A (en) * 1931-04-20 1935-01-22 Siemens Ag Selective transmission system
US1999359A (en) * 1931-08-20 1935-04-30 Rca Corp Remote control system
GB402120A (en) * 1932-05-25 1933-11-27 Marconi Wireless Telegraph Co Improvements in or relating to radio receivers
US1941067A (en) * 1932-10-20 1933-12-26 Edwin H Armstrong Radio broadcasting and receiving
US2156846A (en) * 1936-05-27 1939-05-02 James L Getaz Radio transmission
US2199634A (en) * 1938-06-21 1940-05-07 Rca Corp Secret communication system
US2245652A (en) * 1938-12-07 1941-06-17 World Broadcasting System Inc Method of and apparatus for the reproduction of sound
US2250596A (en) * 1939-07-21 1941-07-29 Rca Corp Receiver output control circuit
US2284064A (en) * 1941-01-25 1942-05-26 Rca Corp Amplifier
US2404338A (en) * 1941-08-20 1946-07-16 Gen Electric Noise suppression circuits
US2321651A (en) * 1942-04-20 1943-06-15 Evansville On The Air Inc Radio signaling system
US2431306A (en) * 1942-07-09 1947-11-25 Int Standard Electric Corp Thermionic amplifier
US2370216A (en) * 1942-07-22 1945-02-27 Gen Electric Noise suppression circuits
US2392672A (en) * 1942-07-24 1946-01-08 Rca Corp Program control receiver
US2441880A (en) * 1944-11-29 1948-05-18 Rca Corp Video amplifier
US2479305A (en) * 1945-04-25 1949-08-16 Gen Electric Selective carrier off noise suppression circuit

Also Published As

Publication number Publication date
BE472016A (en)
FR942971A (en) 1949-02-23
US2602885A (en) 1952-07-08

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