GB1011962A - Improvements in or relating to electrical control circuits - Google Patents

Improvements in or relating to electrical control circuits

Info

Publication number
GB1011962A
GB1011962A GB1467764A GB1467764A GB1011962A GB 1011962 A GB1011962 A GB 1011962A GB 1467764 A GB1467764 A GB 1467764A GB 1467764 A GB1467764 A GB 1467764A GB 1011962 A GB1011962 A GB 1011962A
Authority
GB
United Kingdom
Prior art keywords
channel
signal
output
proportional
diode
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
GB1467764A
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.)
Nortel Networks Ltd
Original Assignee
Northern Electric 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 Northern Electric Co Ltd filed Critical Northern Electric Co Ltd
Publication of GB1011962A publication Critical patent/GB1011962A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Amplifiers (AREA)

Abstract

1,011,962. Electric analogue calculating. NORTHERN ELECTRIC CO. Ltd. April 9, 1964 [May 14, 1963], No. 14677/64. Heading G4G. [Also in Division H4] An electric control circuit, e.g. for controlling the switching of amplifier channels in a twoway communication system, comprises two paths fed with respective first and second signal inputs and whose gains are controlled by the respective second and first signal inputs so that the output of the first path is proportional to the ratio of the first and second input signals and the output of the second path is proportional to the ratio of the second and first signal inputs. The control path outputs may control a bi-stable circuit whose output operates switches in the amplifier paths of a loud-speaking telephone. Fig. 1 shows an embodiment of the control circuit in which the two channels 10a and 10b each include a potential divider consisting of resistor 14a (or 14b) and diode 23a (or 23b). The impedance of the diode and therefore the gain or loss in the channel is controlled by the current flowing through the diode, which current is derived from the other channel input via the amplifier 18b (or 18a) and the rectifying circuit and filter 20b, 21b and 22b (or 20a, 21a and 22a), so that the output signal of the channel is proportional to the ratio of the signal in the one channel and the signal in the other channel.
GB1467764A 1963-05-14 1964-04-09 Improvements in or relating to electrical control circuits Expired GB1011962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA875539 1963-05-14

Publications (1)

Publication Number Publication Date
GB1011962A true GB1011962A (en) 1965-12-01

Family

ID=4141721

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1467764A Expired GB1011962A (en) 1963-05-14 1964-04-09 Improvements in or relating to electrical control circuits

Country Status (4)

Country Link
DE (1) DE1283292B (en)
GB (1) GB1011962A (en)
NL (1) NL6405323A (en)
SE (1) SE302002B (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB703801A (en) * 1951-11-19 1954-02-10 Leonard Ernest Ryall Improvements in or relating to voice switching in telephone transmission systems
DE1049430B (en) * 1954-02-24 1959-01-29 Svenska Reläfabriken AB, Stockholm Voice-controlled two-way amplifier for telephone systems, in particular intercom systems, each with a controllable amplifier unit for each transmission direction
DE1054042B (en) * 1957-12-23 1959-04-02 Moeller & Neumann Gmbh Device for the length of a tie rod independent of the clamping nut
NL225471A (en) * 1957-11-26 1900-01-01
DE1086753B (en) * 1958-04-28 1960-08-11 Ericsson Telefon Ab L M Voice controlled intercom
DE1129543B (en) * 1958-06-25 1962-05-17 Gylling & Co Ab Circuit arrangement for voice-controlled intercom systems

Also Published As

Publication number Publication date
NL6405323A (en) 1964-11-16
SE302002B (en) 1968-07-01
DE1283292B (en) 1968-11-21

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