SE302002B - - Google Patents

Info

Publication number
SE302002B
SE302002B SE590064A SE590064A SE302002B SE 302002 B SE302002 B SE 302002B SE 590064 A SE590064 A SE 590064A SE 590064 A SE590064 A SE 590064A SE 302002 B SE302002 B SE 302002B
Authority
SE
Sweden
Prior art keywords
channel
signal
output
proportional
diode
Prior art date
Application number
SE590064A
Inventor
G Overtveld
Original Assignee
Northern Electric Co
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 filed Critical Northern Electric Co
Publication of SE302002B publication Critical patent/SE302002B/xx

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.
SE590064A 1963-05-14 1964-05-14 SE302002B (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
SE302002B true SE302002B (en) 1968-07-01

Family

ID=4141721

Family Applications (1)

Application Number Title Priority Date Filing Date
SE590064A SE302002B (en) 1963-05-14 1964-05-14

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
BE565494A (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
DE1283292B (en) 1968-11-21
NL6405323A (en) 1964-11-16
GB1011962A (en) 1965-12-01

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