GB628833A - A system for separating synchronising pulses from signal-modulated pulses - Google Patents

A system for separating synchronising pulses from signal-modulated pulses

Info

Publication number
GB628833A
GB628833A GB31124/46A GB3112446A GB628833A GB 628833 A GB628833 A GB 628833A GB 31124/46 A GB31124/46 A GB 31124/46A GB 3112446 A GB3112446 A GB 3112446A GB 628833 A GB628833 A GB 628833A
Authority
GB
United Kingdom
Prior art keywords
valve
pulses
synchronizing
pulse
synchronizing pulses
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
GB31124/46A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB628833A publication Critical patent/GB628833A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/54—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements of vacuum tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H04J3/0617—Systems characterised by the synchronising information used the synchronising signal being characterised by the frequency or phase

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)
  • Amplifiers (AREA)

Abstract

628,833. Multiplex radio pulse signalling. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 18, 1946, No. 31124. Convention date, Oct. 18, 1945. [Classes 40 (v) and 40 (vi)] A system for separating synchronizing pulses from series of signal modulated pulses, comprises a gating stage, and means responsive to the synchronizing pulses only for generating blocking pulses to render the gating stage insensitive except at times corresponding to the arrival of the synchronizing pulses. The incoming train of signal and synchronizing pulses of fixed amplitude is applied to the control grid of valve V1 in Fig. 1, which acts as a gating valve controlled by negative pulses applied from valve V6. In the absence of the negative gating voltage, valve V1 conducts when a positive pulse is applied, a negative impulse being applied through diode V2 to the circuit C3, R4, and the grid of-valve V3 so that this valve ceases to conduct. The short time constant C3, R4 is such that the negative potential on the grid of valve V3 leaks away between pulses. Synchronizing pulses are distinguished from the signal channel pulses by being composed of two closely spaced pulses, so that the period during which valve V3 is cut off is longer when the input pulse possesses the synchronizing characteristic. When valve V3 is cut off, condenser C4 charges through resistance R5, so that the potential of the grid of valve V4 rises. This rise in potential is greater in the case of the synchronizing pulses than in the case of the channel pulses and is then sufficient to render valve V4 conducting. The output from valve V4 is used to trigger off a multivibrator circuit V5, V6. The active period of the multivibrator circuit determined by the condenser resistance circuit C7, R8, is made slightly less than the period between synchronizing pulses, so that the negative pulse on the screen grid of valve V1, derived from the output of valve V6, is maintained until just before the next synchronizing pulse is due. Output pulses corresponding to input synchronizing pulses are taken from valve V4. A modification (Fig. 3, not shown) has the diode V2 omitted, and this circuit is suitable for use with synchronizing pulses characterized by their width. Fig. 4 (not shown) describes a similar circuit utilising triode tubes only, the gating pulse being applied to the cathode of V1 from the output of an additional triode valve V7. Specification 583,117 is referred to.
GB31124/46A 1945-10-18 1946-10-18 A system for separating synchronising pulses from signal-modulated pulses Expired GB628833A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US623127A US2480582A (en) 1945-10-18 1945-10-18 Synchronizing pulse gating system

Publications (1)

Publication Number Publication Date
GB628833A true GB628833A (en) 1949-09-06

Family

ID=22045460

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31124/46A Expired GB628833A (en) 1945-10-18 1946-10-18 A system for separating synchronising pulses from signal-modulated pulses

Country Status (4)

Country Link
US (1) US2480582A (en)
FR (2) FR934838A (en)
GB (1) GB628833A (en)
NL (1) NL76845C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2664509A (en) * 1948-01-09 1953-12-29 Rca Corp Pulse multiplex communication system
GB672195A (en) * 1948-09-06 1952-05-14 John Edward Cope Waveform shaping circuit
US2632050A (en) * 1950-04-03 1953-03-17 Avco Mfg Corp Keyed automatic frequency control system for television receivers
NL90820C (en) * 1951-04-30
US2833853A (en) * 1952-10-24 1958-05-06 Motorola Inc Color television
US2833919A (en) * 1953-03-05 1958-05-06 Collins Radio Co Jitter alleviating system for a scope
BE533423A (en) * 1953-11-18
US3720933A (en) * 1971-07-06 1973-03-13 Dutton H Signaling system with signal level differentiation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2141343A (en) * 1935-06-07 1938-12-27 Philco Radio & Television Corp Electrical system
GB471731A (en) * 1935-12-04 1937-09-06 Eric Lawrence Casling White Improvements in and relating to pulse-operated thermionic valve apparatus, such for example as frequency dividers, electrical counting arrangements and the like
US2199634A (en) * 1938-06-21 1940-05-07 Rca Corp Secret communication system
US2300999A (en) * 1940-10-30 1942-11-03 Westinghouse Electric & Mfg Co Electromagnetic inspection system
US2406019A (en) * 1941-04-01 1946-08-20 Int Standard Electric Corp Pulse modulation system
US2359447A (en) * 1942-06-20 1944-10-03 Rca Corp Electrical circuit
US2416305A (en) * 1942-09-18 1947-02-25 Standard Telephones Cables Ltd Radio receiver
US2399135A (en) * 1943-10-05 1946-04-23 Rca Corp Frequency divider

Also Published As

Publication number Publication date
NL76845C (en) 1955-01-15
US2480582A (en) 1949-08-30
FR934838A (en) 1948-06-02
FR1000353A (en) 1952-02-11

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