GB824221A - Improvements in or relating to electric pulse modulating and demodulating circuits - Google Patents

Improvements in or relating to electric pulse modulating and demodulating circuits

Info

Publication number
GB824221A
GB824221A GB1780256A GB1780256A GB824221A GB 824221 A GB824221 A GB 824221A GB 1780256 A GB1780256 A GB 1780256A GB 1780256 A GB1780256 A GB 1780256A GB 824221 A GB824221 A GB 824221A
Authority
GB
United Kingdom
Prior art keywords
filter
analysed
june
ideal
group
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
GB1780256A
Inventor
Kenneth William Cattermole
Ralph Bertrand Herman
Wincenty Bezdel
Kenneth Stanley Darton
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE556365D priority Critical patent/BE556365A/xx
Priority to CH351630D priority patent/CH351630A/en
Priority to BE543262A priority patent/BE543262A/en
Priority to FR1149154D priority patent/FR1149154A/en
Priority to DEI10975A priority patent/DE1084757B/en
Priority to FR70164D priority patent/FR70164E/en
Priority to GB10123/56A priority patent/GB791933A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB28143/56A priority patent/GB824222A/en
Priority to CH361834D priority patent/CH361834A/en
Priority to GB10137/57A priority patent/GB843478A/en
Priority to FR71668D priority patent/FR71668E/en
Priority to CH4663257A priority patent/CH363677A/en
Priority to AU28140/57A priority patent/AU218043B2/en
Priority to US663704A priority patent/US3073903A/en
Priority to FR72050D priority patent/FR72050E/en
Priority to BE558179A priority patent/BE558179A/en
Priority to DEI13326A priority patent/DE1189132B/en
Priority to FR761818A priority patent/FR73279E/en
Priority to FR789628A priority patent/FR75359E/en
Priority to FR797751A priority patent/FR75916E/en
Publication of GB824221A publication Critical patent/GB824221A/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
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/588—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using sampling gates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/047—Distributors with transistors or integrated circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/20—Time-division multiplex systems using resonant transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Abstract

824,221. Automatic exchange systems. STANDARD TELEPHONES & CABLES Ltd. June 7, 1957 [June 8, 1956], No. 17802/56. Drawings to Specification. Class 40 (4). [Also in Group XL (c)] The requirements for minimum transmission loss in the low-pass filter section of the reactance-store " modems " disclosed in Specification 753,645, [Group XL (c)], are analysed and ideal formulae given. It is shown that the filter should have a response to a current impulse consisting of an oscillating voltage having a value of substantially zero at time intervals equal to integral multiples of the switching time period, assuming that the signal wave has a frequency between zero and half the switch operation frequency. The application of the formulae to two-way and to one-way systems, with or without repeaters, and to the system disclosed in Specification 822,297 is analysed and shown to be satisfactory. It is suggested that a sufficiently close approximation to the ideal may be achieved by a 3 or more element maximally flat filter, though a filter of the equal ripple could be used. Practical values for a 4- element maximally flat filter are given. Specification 824,222 also is referred to.
GB1780256A 1954-12-03 1956-06-08 Improvements in or relating to electric pulse modulating and demodulating circuits Expired GB824221A (en)

Priority Applications (20)

Application Number Priority Date Filing Date Title
BE556365D BE556365A (en) 1954-12-03
CH351630D CH351630A (en) 1954-12-03 1955-11-23 Electrical pulse converter
BE543262A BE543262A (en) 1954-12-03 1955-12-01 Electronic pulse modulation and demodulation circuit
FR1149154D FR1149154A (en) 1954-12-03 1955-12-02 Electrical pulse modulation and demodulation circuits
DEI10975A DE1084757B (en) 1954-12-03 1955-12-03 Circuit arrangement for converting pulses
FR70164D FR70164E (en) 1954-12-03 1956-02-07 Electrical pulse modulation and demodulation circuits
GB10123/56A GB791933A (en) 1954-12-03 1956-04-03 Improvements in or relating to telecommunication systems
GB28143/56A GB824222A (en) 1954-12-03 1956-09-14 Improvements in or relating to electric pulse modulating and demodulating circuits
CH361834D CH361834A (en) 1954-12-03 1957-03-05 Time filter
GB10137/57A GB843478A (en) 1954-12-03 1957-03-28 Improvements in or relating to electrical wave-generators
FR71668D FR71668E (en) 1954-12-03 1957-04-02 Electrical pulse modulation and demodulation circuits
CH4663257A CH363677A (en) 1954-12-03 1957-05-28 Electric two-way pulse converter
AU28140/57A AU218043B2 (en) 1954-12-03 1957-05-28 Improvements in or relating to electric pulse modulating and demodulating circuits
US663704A US3073903A (en) 1954-12-03 1957-06-05 Electric pulse modulating and demodulating circuits
FR72050D FR72050E (en) 1954-12-03 1957-06-06 Electrical pulse modulation and demodulation circuits
BE558179A BE558179A (en) 1954-12-03 1957-06-07 Electronic pulse modulation or demodulation circuit
DEI13326A DE1189132B (en) 1954-12-03 1957-06-07 Circuit arrangement for pulse amplitude modulation and demodulation
FR761818A FR73279E (en) 1954-12-03 1958-03-28 Electrical pulse modulation and demodulation circuits
FR789628A FR75359E (en) 1954-12-03 1959-03-17 Electrical pulse modulation and demodulation circuits
FR797751A FR75916E (en) 1954-12-03 1959-06-17 Electrical pulse modulation and demodulation circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3504754A GB753645A (en) 1954-12-03 1954-12-03 Improvements in or relating to electric pulse modulating and demodulating circuits

Publications (1)

Publication Number Publication Date
GB824221A true GB824221A (en) 1959-11-25

Family

ID=10373174

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3504754A Expired GB753645A (en) 1954-12-03 1954-12-03 Improvements in or relating to electric pulse modulating and demodulating circuits
GB1780256A Expired GB824221A (en) 1954-12-03 1956-06-08 Improvements in or relating to electric pulse modulating and demodulating circuits

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB3504754A Expired GB753645A (en) 1954-12-03 1954-12-03 Improvements in or relating to electric pulse modulating and demodulating circuits

Country Status (1)

Country Link
GB (2) GB753645A (en)

Also Published As

Publication number Publication date
GB753645A (en) 1956-07-25

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