HK20587A - Electronic telephone circuit - Google Patents

Electronic telephone circuit

Info

Publication number
HK20587A
HK20587A HK205/87A HK20587A HK20587A HK 20587 A HK20587 A HK 20587A HK 205/87 A HK205/87 A HK 205/87A HK 20587 A HK20587 A HK 20587A HK 20587 A HK20587 A HK 20587A
Authority
HK
Hong Kong
Prior art keywords
voltage
circuit
amplifier
reference voltage
electronic
Prior art date
Application number
HK205/87A
Other languages
English (en)
Inventor
Fred Blomley Peter
Original Assignee
Northern Telecom Limited
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 Telecom Limited filed Critical Northern Telecom Limited
Publication of HK20587A publication Critical patent/HK20587A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6025—Substation equipment, e.g. for use by subscribers including speech amplifiers implemented as integrated speech networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Selective Calling Equipment (AREA)
  • Telephone Function (AREA)
HK205/87A 1979-08-31 1987-03-05 Electronic telephone circuit HK20587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7930246A GB2057815B (en) 1979-08-31 1979-08-31 Electronic telephone circuit

Publications (1)

Publication Number Publication Date
HK20587A true HK20587A (en) 1987-03-13

Family

ID=10507528

Family Applications (1)

Application Number Title Priority Date Filing Date
HK205/87A HK20587A (en) 1979-08-31 1987-03-05 Electronic telephone circuit

Country Status (31)

Country Link
US (1) US4347407A (cs)
JP (1) JPS5636254A (cs)
KR (1) KR830001772B1 (cs)
AR (1) AR220987A1 (cs)
AT (1) AT384917B (cs)
AU (1) AU538701B2 (cs)
BE (1) BE885009A (cs)
BR (1) BR8005521A (cs)
CA (1) CA1150868A (cs)
CH (1) CH652545A5 (cs)
DD (1) DD153302A5 (cs)
DE (1) DE3027452C2 (cs)
DK (1) DK369480A (cs)
FI (1) FI73342C (cs)
FR (1) FR2464594B1 (cs)
GB (1) GB2057815B (cs)
HK (1) HK20587A (cs)
HU (1) HU183146B (cs)
IL (1) IL60222A (cs)
IN (1) IN152651B (cs)
IT (1) IT1209261B (cs)
MX (1) MX147657A (cs)
NL (1) NL8004833A (cs)
NO (1) NO153512C (cs)
NZ (1) NZ194800A (cs)
PH (1) PH16267A (cs)
PT (1) PT71752B (cs)
SE (1) SE448662B (cs)
SU (1) SU1303047A3 (cs)
YU (1) YU40882B (cs)
ZA (1) ZA803828B (cs)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534237B1 (fr) * 1982-10-12 1987-10-23 Krupp Gmbh Grue roulante de grande force portante a fleche extensible, notamment a fleche telescopique
GB8317706D0 (en) * 1983-06-29 1983-08-03 Standard Telephones Cables Ltd Telephone subsets
US5206459A (en) * 1991-08-21 1993-04-27 Champlain Cable Corporation Conductive polymeric shielding materials and articles fabricated therefrom

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1638014A1 (de) * 1951-01-28 1971-06-16 Itt Ind Gmbh Deutsche Monolithisch integrierte Parallelregelschaltung
GB944762A (en) * 1961-03-20 1963-12-18 Ass Elect Ind Improvements relating to self-regulating two-terminal impedance networks and their use in telephone system substation circuits
US3251951A (en) * 1962-02-26 1966-05-17 Philips Corp Circuit for automatic adjustment of impedance of a telephone loop
NL7402575A (nl) * 1974-02-26 1975-08-28 Philips Nv Elektronisch telefoontoestel.
CA1032221A (en) * 1974-06-14 1978-05-30 Mitel Canada Limited Telephone line impedance regulator
AU518350B2 (en) * 1978-11-08 1981-09-24 International Standard Electric Corp. Bidirectional amplifier

Also Published As

Publication number Publication date
NL8004833A (nl) 1981-03-03
IN152651B (cs) 1984-03-03
BE885009A (nl) 1981-03-02
ZA803828B (en) 1981-07-29
DE3027452C2 (de) 1987-02-19
NO802470L (no) 1981-03-02
SE8006004L (sv) 1981-03-01
KR830004003A (ko) 1983-06-30
YU217380A (en) 1982-10-31
JPH0145262B2 (cs) 1989-10-03
NO153512C (no) 1986-04-09
IT8024352A0 (it) 1980-08-29
FR2464594B1 (fr) 1986-04-18
FI802688A7 (fi) 1981-03-01
YU40882B (en) 1986-08-31
CA1150868A (en) 1983-07-26
ATA437580A (de) 1987-06-15
SU1303047A3 (ru) 1987-04-07
US4347407A (en) 1982-08-31
DE3027452A1 (de) 1981-03-12
KR830001772B1 (ko) 1983-09-03
MX147657A (es) 1982-12-30
CH652545A5 (de) 1985-11-15
NO153512B (no) 1985-12-23
AU538701B2 (en) 1984-08-23
JPS5636254A (en) 1981-04-09
GB2057815A (en) 1981-04-01
PH16267A (en) 1983-08-23
PT71752B (en) 1981-06-29
FI73342C (fi) 1987-09-10
DD153302A5 (de) 1981-12-30
NZ194800A (en) 1983-09-30
AR220987A1 (es) 1980-12-15
AT384917B (de) 1988-01-25
BR8005521A (pt) 1981-03-17
FI73342B (fi) 1987-05-29
PT71752A (en) 1980-09-01
IL60222A0 (en) 1980-09-16
GB2057815B (en) 1983-08-10
IT1209261B (it) 1989-07-16
IL60222A (en) 1983-05-15
AU6166680A (en) 1981-03-05
HU183146B (en) 1984-04-28
FR2464594A1 (fr) 1981-03-06
SE448662B (sv) 1987-03-09
DK369480A (da) 1981-03-01

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Legal Events

Date Code Title Description
PE Patent expired