GB1149652A – Signal transmission systems
– Google Patents
GB1149652A – Signal transmission systems
– Google Patents
Signal transmission systems
Info
Publication number
GB1149652A
GB1149652A
GB18369/66A
GB1836966A
GB1149652A
GB 1149652 A
GB1149652 A
GB 1149652A
GB 18369/66 A
GB18369/66 A
GB 18369/66A
GB 1836966 A
GB1836966 A
GB 1836966A
GB 1149652 A
GB1149652 A
GB 1149652A
Authority
GB
United Kingdom
Prior art keywords
command
main station
equalizer
fed
station
Prior art date
1965-05-07
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
GB18369/66A
Inventor
Robert Shiels Graham
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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.)
1965-05-07
Filing date
1966-04-27
Publication date
1969-04-23
1966-04-27
Application filed by Western Electric Co Inc
filed
Critical
Western Electric Co Inc
1969-04-23
Publication of GB1149652A
publication
Critical
patent/GB1149652A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04B—TRANSMISSION
H04B3/00—Line transmission systems
H04B3/02—Details
H04B3/04—Control of transmission; Equalising
H04B3/10—Control of transmission; Equalising by pilot signal
Abstract
1,149,652. Equalizing system. WESTERN ELECTRIC CO. Inc. 27 April, 1966 [7 May, 1965], No. 18369/66. Heading H4R. An equalizer at an intermediate station in a transmission system is controlled from a main station by command signals fed over the system and used to set a memory device at the intermediate station to one of a number of states, the memory device being connected to the equalizer to adjust the equalizer to a frequency response condition corresponding to the memory condition. Fig. 2 shows equalizing equipment at an intermediate station in which 5 equalizer sections are provided each independently adjusted and each compensating a respective portion of the pass band of the receiver. Command signals received at terminal 39 are tapped off at point A and fed via line 79 to the command receiver 80. The command signal comprises a two out of eight voice frequency code on a carrier just outside the conventional service band of the system, and the various code combinations are used to provide increase or decrease of the count of any of the binary counters 64 to 68, or to operate either of the switches 81 or 82, to connect the outputs of the test frequency generators respectively to the input or the output of the equalizer section. In operation an attendant at the main station would command the test oscillators to be connected to the line, the frequencies of these oscillators corresponding to the centre frequencies of the effective bands of the five equalizers, and, by analysis of the signal levels at the main station, determine the adjustment required to the five equalizers. By sending pulses of the appropriate frequencies the count in the appropriate binary counters 65 to 68 can be increased or decreased to cause via the decoders 75 the appropriate modification of the heater currents of thermistors 58 to 62 to provide the required equalization. A command receiver comprising a bank of band pass filters and peak detectors connected via a matrix to a bank of » and » gates is described with respect to Fig. 4 (not shown). The command signals are fed ,Fig. 1 (not shown) from a first main station (17) over, e.g. the westbound channel (22) to a second main station (16) where it is fed via a command signal band pass filter (26) to the other, e.g. eastbound channel (12) for transmission to the intermediate repeater (14). Test signals generated at the intermediate repeater (14) are fed on to the, e.g. eastbound channel (12) to the first main station (17) to be analysed there to derive information required for the subsequent adjustment of the equalizers by further command signals.
GB18369/66A
1965-05-07
1966-04-27
Signal transmission systems
Expired
GB1149652A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US454097A
US3368167A
(en)
1965-05-07
1965-05-07
Apparatus for equalizing a transmission system
Publications (1)
Publication Number
Publication Date
GB1149652A
true
GB1149652A
(en)
1969-04-23
Family
ID=23803292
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB18369/66A
Expired
GB1149652A
(en)
1965-05-07
1966-04-27
Signal transmission systems
Country Status (6)
Country
Link
US
(1)
US3368167A
(en)
BE
(1)
BE680069A
(en)
DE
(1)
DE1290982B
(en)
GB
(1)
GB1149652A
(en)
NL
(1)
NL6604064A
(en)
SE
(1)
SE336378B
(en)
Families Citing this family (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3663898A
(en)
*
1969-12-17
1972-05-16
Bell Telephone Labor Inc
Equalizer
US3737585A
(en)
*
1971-06-16
1973-06-05
Itt
Regenerative pcm line repeater
US3806658A
(en)
*
1972-10-30
1974-04-23
Bell Telephone Labor Inc
Common controlled equalization system
IT980928B
(en)
*
1973-04-30
1974-10-10
Cselt Centro Studi Lab Telecom
USER AND INPUT EQUIPMENT TO A PCM CENTRAL FOR HIGH SPEED DATA TRANSMISSION CITA
DE19708525C1
(en)
*
1997-03-03
1998-11-05
Siemens Ag
Communication system
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2465531A
(en)
*
1945-06-08
1949-03-29
Bell Telephone Labor Inc
Transmission control system
US2520007A
(en)
*
1947-11-21
1950-08-22
Bell Telephone Labor Inc
Testing circuit for carrier communication system with automatic reset timer
GB920491A
(en)
*
1958-05-29
1963-03-06
Submarine Cables Ltd
Attenuation equaliser for submarine cables
US3046499A
(en)
*
1959-10-31
1962-07-24
Felten & Guilleaume Carlswerk
Arrangement for adjusting the frequency-dependent attenuation in submarine cable system
1965
1965-05-07
US
US454097A
patent/US3368167A/en
not_active
Expired – Lifetime
1966
1966-03-28
NL
NL6604064A
patent/NL6604064A/xx
unknown
1966-04-26
BE
BE680069D
patent/BE680069A/xx
unknown
1966-04-27
GB
GB18369/66A
patent/GB1149652A/en
not_active
Expired
1966-05-05
DE
DEW41494A
patent/DE1290982B/en
active
Pending
1966-05-06
SE
SE06257/66A
patent/SE336378B/xx
unknown
Also Published As
Publication number
Publication date
BE680069A
(en)
1966-10-03
SE336378B
(en)
1971-07-05
NL6604064A
(en)
1966-11-08
US3368167A
(en)
1968-02-06
DE1290982B
(en)
1969-03-20
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