GB426227A - Improvements in or relating to radio signalling - Google Patents

Improvements in or relating to radio signalling

Info

Publication number
GB426227A
GB426227A GB2435/34A GB243534A GB426227A GB 426227 A GB426227 A GB 426227A GB 2435/34 A GB2435/34 A GB 2435/34A GB 243534 A GB243534 A GB 243534A GB 426227 A GB426227 A GB 426227A
Authority
GB
United Kingdom
Prior art keywords
signal
frequency
phase
amplifier
resistance
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
GB2435/34A
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24620034&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB426227(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of GB426227A publication Critical patent/GB426227A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

426,227. Wireless signalling. ARMSTRONG, E. H., 211, Central Park West, New York, U.S.A. Jan. 24, 1934, No. 2435. Convention date, Jan. 24, 1933. [Class 40 (v)] Frequency or phase modulation is effected by aperiodic circuits, the phase shift of the carrier wave being directly proportional to the amplitude and inversely proportional to the frequency of the signal. The output from a constantfrequency oscillator 1, Fig. 1, is connected (a) through an amplifier 2 to a resistance 3, and (b) in parallel to two amplifiers 4, 5 coupled at 6 to the signal source 26, and at 9, 10 to an amplifier 12 which feeds back to the resistance 3 currents displaced in phase by the signal components. As shown in Fig. 3, A represents the signal voltage and B the corresponding plate voltages impressed on the valves 4, 5. The vector MN at C represents the voltage across the resistance 3 in the output of amplifier 2 when no signal component is present, whilst ON and NP represent the phase-shift over one cycle of signal current. The resulting phasemodulated carrier is fed through further amplifiers, filters, and current-limiters to the transmitting aerial. Since the time taken to shift the phase is inversely proportional to the frequency of modulation, a correction circuit 27, 28 is introduced at the signal input. This feeds to the transformer 6 a voltage which is inversely proportional to the signal frequency, thereby maintaining constant modulation for high notes and low. The initial small phaseshift may be increased, say for television, to any desired extent by frequency-multiplying, combined if necessary with heterodyning. Specifications 290,642, [Class 40 (v)], and 426,228 are referred to.
GB2435/34A 1933-01-24 1934-01-24 Improvements in or relating to radio signalling Expired GB426227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US653237A US1941069A (en) 1933-01-24 1933-01-24 Radiosignaling

Publications (1)

Publication Number Publication Date
GB426227A true GB426227A (en) 1935-03-29

Family

ID=24620034

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2436/34A Expired GB426228A (en) 1933-01-24 1934-01-24 Improvements in or relating to radio signalling
GB2435/34A Expired GB426227A (en) 1933-01-24 1934-01-24 Improvements in or relating to radio signalling

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2436/34A Expired GB426228A (en) 1933-01-24 1934-01-24 Improvements in or relating to radio signalling

Country Status (6)

Country Link
US (1) US1941069A (en)
BE (1) BE433916A (en)
DE (1) DE924809C (en)
FR (1) FR771091A (en)
GB (2) GB426228A (en)
NL (1) NL44760C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB509820A (en) * 1937-11-19 1939-07-19 Edmond Maurice Deloraine Improvements in or relating to electric signalling systems
BE480549A (en) * 1938-11-12
DE927749C (en) * 1942-05-12 1955-05-16 Studiengesellschaft Fuer Elekt Circuit arrangement for limiting the amplitude
DE972138C (en) * 1943-12-31 1959-05-27 Funkstrahl Ges Fuer Nachrichte Arrangement for limiting the amplitude of alternating voltages, in particular of frequency-modulated oscillations
DE1277375B (en) * 1964-11-06 1968-09-12 Te Ka De Fernmeldeapp G M B H Method for frequency modulation of relatively low carrier frequencies, especially in the km wave range

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE361387C (en) * 1920-02-28 1922-10-13 Marconi Wireless Telegraph Co Wireless telephony transmitter
DE424239C (en) * 1920-08-31 1926-01-22 Siemens & Halske Akt Ges Method for wireless high frequency telephony
US1599586A (en) * 1922-04-27 1926-09-14 John Hays Hammond Jr Radiant signaling system
US1885826A (en) * 1926-12-08 1932-11-01 American Telephone & Telegraph System of photography employing frequency modulation
US1941447A (en) * 1927-05-18 1933-12-26 Edwin H Armstrong Radio telephone signaling
GB290642A (en) * 1927-05-18 1929-07-18 Edwin Howard Armstrong Improvements in radio telephone signalling
US1819508A (en) * 1927-08-11 1931-08-18 Rca Corp Communication by frequency variation
US1872364A (en) * 1927-10-08 1932-08-16 Westinghouse Electric & Mfg Co Radiotransmitting system
US1867567A (en) * 1929-02-01 1932-07-19 Rca Corp Detection of frequency modulated signals
US1917102A (en) * 1929-07-22 1933-07-04 Gen Electric Frequency modulation

Also Published As

Publication number Publication date
BE433916A (en)
DE924809C (en) 1955-03-07
FR771091A (en) 1934-09-29
NL44760C (en) 1900-01-01
GB426228A (en) 1935-03-29
US1941069A (en) 1933-12-26

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