GB571627A - Improvements in or relating to carrier current telephone transmitter circuits - Google Patents

Improvements in or relating to carrier current telephone transmitter circuits

Info

Publication number
GB571627A
GB571627A GB17374/43A GB1737443A GB571627A GB 571627 A GB571627 A GB 571627A GB 17374/43 A GB17374/43 A GB 17374/43A GB 1737443 A GB1737443 A GB 1737443A GB 571627 A GB571627 A GB 571627A
Authority
GB
United Kingdom
Prior art keywords
valve
carrier
fed
pulses
frequency
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
GB17374/43A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International Co
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 Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB571627A publication Critical patent/GB571627A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/20—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to anode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation

Landscapes

  • Circuits Of Receivers In General (AREA)
  • Amplifiers (AREA)

Abstract

571,627. Modulating systems. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. Oct. 21, 1943, No. 17374. Convention date, Oct. 22, 1942. [Class 40 (v)] Amplitude-modulated waves are broken up into short pulses, the duration of which is continually variable with the signal volume. Amplitude-modulated carrier is fed to the output 2 from a carrier amplifier valve 1 fed by a carrier source 8 ; modulating voltage being applied at terminals 11 to vary the anode voltage. The H.T. supply from battery 13 to valve 1 passes through a radio-frequency choke 9, speech choke 12, and electronic switch 14 so that carrier is emitted to load circuit 2 in pulses, the duration and spacing of which is dependent on the pulse voltage applied to the grid of the switch valve 14. These pulses are supplied through an amplifier 28 and transformer 29 by a multi-vibrator 15, 16 synchronized by a control oscillator 25, the frequency of which is higher than the highest signal frequency. Variation in the ratio of pulse period to gap period is effected by voltages applied to the grid of the valve 15 from a condenser 39 connected to a full-wave rectifier circuit 37, 38 fed from the divided secondary coil 36 of the modulation transformer 41. The pulse period is thus variable according to the signal volume.
GB17374/43A 1942-10-22 1943-10-21 Improvements in or relating to carrier current telephone transmitter circuits Expired GB571627A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US462985A US2338512A (en) 1942-10-22 1942-10-22 Telephone transmitter circuit

Publications (1)

Publication Number Publication Date
GB571627A true GB571627A (en) 1945-09-03

Family

ID=23838478

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17374/43A Expired GB571627A (en) 1942-10-22 1943-10-21 Improvements in or relating to carrier current telephone transmitter circuits

Country Status (2)

Country Link
US (1) US2338512A (en)
GB (1) GB571627A (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441963A (en) * 1940-02-03 1948-05-25 Int Standard Electric Corp Electric impulse signaling system
US2483766A (en) * 1942-12-29 1949-10-04 Rca Corp Power converter system
US2568265A (en) * 1943-03-18 1951-09-18 Luis W Alvarez Radio beacon and system utilizing it
US2492161A (en) * 1943-06-01 1949-12-27 Int Standard Electric Corp Means for generating time modulated electrical pulses
US2621306A (en) * 1943-08-03 1952-12-09 Arthur A Varela Time-delay circuit
US2432204A (en) * 1944-01-05 1947-12-09 Rca Corp Pulse modulation system
US2430139A (en) * 1944-01-08 1947-11-04 Rca Corp Pulse number modulation system
US2438950A (en) * 1944-04-18 1948-04-06 Jr Carl Harrison Smith Pulse frequency modulation
US2455616A (en) * 1944-11-15 1948-12-07 Remco Electronic Inc Transientless modulator system for keying
BE476259A (en) * 1944-12-20
US2442305A (en) * 1945-11-19 1948-05-25 Farnsworth Res Corp Modulator
US2557697A (en) * 1945-11-27 1951-06-19 Otto H Schmitt Square wave modulating arrangement
US2442514A (en) * 1946-01-04 1948-06-01 Hazeltine Research Inc Pulse-modulated oscillation generator
US2632847A (en) * 1946-02-04 1953-03-24 Jr John C Reed Pulse forming circuit
US2482561A (en) * 1946-03-19 1949-09-20 Rca Corp Voltage two-tone source
US2698922A (en) * 1948-06-03 1955-01-04 Bell Telephone Labor Inc Single-sided push-pull amplifier
US2769868A (en) * 1952-02-18 1956-11-06 Phillips Petroleum Co Line fault detector
US2729792A (en) * 1953-02-12 1956-01-03 Aircraft Armaments Inc Modulators
US3143658A (en) * 1958-11-28 1964-08-04 Atlantic Refining Co Method and apparatus for producing and recording a pulse frequency modulated signal
US3506920A (en) * 1966-02-10 1970-04-14 Gates Radio Co High efficiency transformer utilizing pulse duration modulation to eliminate audio-rf transformer coupling

Also Published As

Publication number Publication date
US2338512A (en) 1944-01-04

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