IT1033427B - Circuito elettronico vocale per un apparecchio telefonico centrale a batteria - Google Patents

Circuito elettronico vocale per un apparecchio telefonico centrale a batteria

Info

Publication number
IT1033427B
IT1033427B IT20931/75A IT2093175A IT1033427B IT 1033427 B IT1033427 B IT 1033427B IT 20931/75 A IT20931/75 A IT 20931/75A IT 2093175 A IT2093175 A IT 2093175A IT 1033427 B IT1033427 B IT 1033427B
Authority
IT
Italy
Prior art keywords
battery
electronic circuit
telephone set
central telephone
voice electronic
Prior art date
Application number
IT20931/75A
Other languages
English (en)
Inventor
L Mersich
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Application granted granted Critical
Publication of IT1033427B publication Critical patent/IT1033427B/it

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)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
IT20931/75A 1974-03-05 1975-03-05 Circuito elettronico vocale per un apparecchio telefonico centrale a batteria IT1033427B (it)

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
IT1033427B true IT1033427B (it) 1979-07-10

Family

ID=20320413

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20931/75A IT1033427B (it) 1974-03-05 1975-03-05 Circuito elettronico vocale per un apparecchio telefonico centrale a batteria

Country Status (12)

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

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 (it) * 1970-09-03 1976-12-18

Also Published As

Publication number Publication date
NO134855C (it) 1976-12-29
DK86475A (it) 1975-11-03
SE380699B (sv) 1975-11-10
US3974344A (en) 1976-08-10
NO134855B (it) 1976-09-13
ES435269A1 (es) 1976-12-16
DK139600B (da) 1979-03-12
DK139600C (it) 1979-08-27
SE7402901L (it) 1975-09-08
CA1011479A (en) 1977-05-31
BR7501102A (pt) 1975-12-02
FR2263648B1 (it) 1979-03-02
NO750717L (it) 1975-09-08
FR2263648A1 (it) 1975-10-03
NL7502112A (nl) 1975-09-09
FI750378A (it) 1975-09-06
GB1493869A (en) 1977-11-30

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