CA1011479A - Electronic speech circuit for a central battery telephone set - Google Patents

Electronic speech circuit for a central battery telephone set

Info

Publication number
CA1011479A
CA1011479A CA221,338A CA221338A CA1011479A CA 1011479 A CA1011479 A CA 1011479A CA 221338 A CA221338 A CA 221338A CA 1011479 A CA1011479 A CA 1011479A
Authority
CA
Canada
Prior art keywords
telephone set
speech circuit
central battery
electronic speech
battery telephone
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
CA221,338A
Other languages
English (en)
Other versions
CA221338S (en
Inventor
Laszlo Mersich
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of CA1011479A publication Critical patent/CA1011479A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits
    • H04M1/585—Anti-side-tone circuits implemented without inductive element
    • 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)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
CA221,338A 1974-03-05 1975-03-05 Electronic speech circuit for a central battery telephone set Expired CA1011479A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7402901A SE380699B (sv) 1974-03-05 1974-03-05 Elektronisk talkrets for en centralbatterimatad telefonapparat.

Publications (1)

Publication Number Publication Date
CA1011479A true CA1011479A (en) 1977-05-31

Family

ID=20320413

Family Applications (1)

Application Number Title Priority Date Filing Date
CA221,338A Expired CA1011479A (en) 1974-03-05 1975-03-05 Electronic speech circuit for a central battery telephone set

Country Status (12)

Country Link
US (1) US3974344A (no)
BR (1) BR7501102A (no)
CA (1) CA1011479A (no)
DK (1) DK139600B (no)
ES (1) ES435269A1 (no)
FI (1) FI750378A (no)
FR (1) FR2263648B1 (no)
GB (1) GB1493869A (no)
IT (1) IT1033427B (no)
NL (1) NL7502112A (no)
NO (1) NO134855C (no)
SE (1) SE380699B (no)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1546046A (en) * 1976-12-03 1979-05-16 Cselt Centro Studi Lab Telecom Transmitting and receiving circuit for subscriber telephone sets
US4163878A (en) * 1977-09-07 1979-08-07 Wescom, Inc. Electronic hybrid and hybrid repeater with bridge circuit
US4192978A (en) * 1978-02-27 1980-03-11 Vincent Ogden W Operational amplifier hybrid system
US4718083A (en) * 1985-09-23 1988-01-05 Gte Communication Systems Corporation Differential receive booster amplifier for telephone instruments
JP2734265B2 (ja) * 1991-12-12 1998-03-30 日本電気株式会社 エレクトレット・コンデンサ・マイクロフォン用増幅回路

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462560A (en) * 1966-04-06 1969-08-19 Bell Telephone Labor Inc Subscriber telephone circuit with resistance hybrid sidetone balancing network
DE1919111B1 (de) * 1969-04-15 1970-10-29 Siemens Ag Schaltungsanordnung fuer einen Transistorhoerverstaerker mit Daempfungsausgleich in Fernsprechteilnehmerstellen
JPS5148006B1 (no) * 1970-09-03 1976-12-18

Also Published As

Publication number Publication date
NO134855B (no) 1976-09-13
DK139600C (no) 1979-08-27
DK139600B (da) 1979-03-12
ES435269A1 (es) 1976-12-16
IT1033427B (it) 1979-07-10
NO750717L (no) 1975-09-08
GB1493869A (en) 1977-11-30
BR7501102A (pt) 1975-12-02
FI750378A (no) 1975-09-06
NO134855C (no) 1976-12-29
FR2263648B1 (no) 1979-03-02
NL7502112A (nl) 1975-09-09
SE7402901L (no) 1975-09-08
FR2263648A1 (no) 1975-10-03
US3974344A (en) 1976-08-10
DK86475A (no) 1975-11-03
SE380699B (sv) 1975-11-10

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