GB642097A - Improvements in or relating to signal transmission systems - Google Patents

Improvements in or relating to signal transmission systems

Info

Publication number
GB642097A
GB642097A GB30320/46A GB3032046A GB642097A GB 642097 A GB642097 A GB 642097A GB 30320/46 A GB30320/46 A GB 30320/46A GB 3032046 A GB3032046 A GB 3032046A GB 642097 A GB642097 A GB 642097A
Authority
GB
United Kingdom
Prior art keywords
frequency
source
modulation
pulse
oct
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
GB30320/46A
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.)
Sadir Carpentier SA
Original Assignee
Sadir Carpentier SA
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 Sadir Carpentier SA filed Critical Sadir Carpentier SA
Publication of GB642097A publication Critical patent/GB642097A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Transmitters (AREA)
  • Dc Digital Transmission (AREA)

Abstract

642,097. Pulse modulation; multiplex signalling. SADIR-CARPENTIER. Oct. 10, 1946, No. 30320. Convention date, Oct. 25, 1945. [Class 40 (v)] In an impulse modulation communication transmitter comprising a source 1 of periodically recurring impulses, a linearizing counter reaction loop 5, 6, 7 is associated with a modulator 3, the output current of which is fed through an impulse frequency dividing circuit. Modulation is therefore effected on a train of impulses, the repetition frequency of which is a whole multiple of the output pulse frequency. Distortion is reduced by the loop 5, 6, 7 which comprises a demodulator, a low-pass filter and attenuator or dephaser, the low-pass filter being arranged to cut off at a relatively high value as determined by the frequency of the source 1. When used for a multiplex system, Fig. 2 (not shown), several channels are fed in parallel from source 1, each channel being modulated separately and the frequency divider giving modulated outputs of lower repetition frequency. These outputs are then combined in a mixer and transmitted as a pulse train which is representative of all the channel signals.
GB30320/46A 1945-10-25 1946-10-10 Improvements in or relating to signal transmission systems Expired GB642097A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR642097X 1945-10-25

Publications (1)

Publication Number Publication Date
GB642097A true GB642097A (en) 1950-08-30

Family

ID=8998616

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30320/46A Expired GB642097A (en) 1945-10-25 1946-10-10 Improvements in or relating to signal transmission systems

Country Status (2)

Country Link
US (1) US2491969A (en)
GB (1) GB642097A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986002526A1 (en) * 1984-10-26 1986-05-09 Hi-Tec Control Systems Pty. Ltd. Electronic frequency modulator

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE502163A (en) * 1950-03-29
US2968010A (en) * 1958-01-06 1961-01-10 North American Aviation Inc Amplitude modulator
US3192481A (en) * 1962-09-10 1965-06-29 Gen Precision Inc Signal amplitude discriminator
US3315181A (en) * 1964-06-09 1967-04-18 Jerome A Rosenthal Pulse modulator circuit
US3336538A (en) * 1964-08-13 1967-08-15 Norman H Crowhurst Two-state power amplifier with transitional feedback
US4498187A (en) * 1979-10-30 1985-02-05 Pitney Bowes Inc. Electronic postage meter having plural computing systems
US4525785A (en) * 1979-10-30 1985-06-25 Pitney Bowes Inc. Electronic postage meter having plural computing system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510881A (en) * 1938-02-07 1939-08-08 Baird Television Ltd Improvements in or relating to methods of producing electrical oscillations
US2224580A (en) * 1938-11-16 1940-12-10 Bell Telephone Labor Inc Modulation system
US2314707A (en) * 1941-03-07 1943-03-23 Rca Corp Signaling system
GB556208A (en) * 1941-04-25 1943-09-24 Standard Telephones Cables Ltd Arrangement for conversion of frequency modulation to phase modulation and the application thereof to the production of a frequency modulated wave from a frequency stable oscillator
US2418568A (en) * 1944-04-11 1947-04-08 Hewlett Packard Co Frequency divider
US2420374A (en) * 1944-07-01 1947-05-13 Rca Corp Pulse multiplex transmission system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986002526A1 (en) * 1984-10-26 1986-05-09 Hi-Tec Control Systems Pty. Ltd. Electronic frequency modulator

Also Published As

Publication number Publication date
US2491969A (en) 1949-12-20

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