FR941331A - Telephone circuits - Google Patents

Telephone circuits

Info

Publication number
FR941331A
FR941331A FR941331DA FR941331A FR 941331 A FR941331 A FR 941331A FR 941331D A FR941331D A FR 941331DA FR 941331 A FR941331 A FR 941331A
Authority
FR
France
Prior art keywords
telephone circuits
telephone
circuits
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
Other languages
French (fr)
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of FR941331A publication Critical patent/FR941331A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/40—Artificial lines; Networks simulating a line of certain length
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephone Function (AREA)
  • Thermistors And Varistors (AREA)
FR941331D 1942-10-24 1947-01-30 Telephone circuits Expired FR941331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US463184A US2387269A (en) 1942-10-24 1942-10-24 Telephone system

Publications (1)

Publication Number Publication Date
FR941331A true FR941331A (en) 1949-01-07

Family

ID=23839177

Family Applications (1)

Application Number Title Priority Date Filing Date
FR941331D Expired FR941331A (en) 1942-10-24 1947-01-30 Telephone circuits

Country Status (6)

Country Link
US (1) US2387269A (en)
BE (1) BE468046A (en)
ES (1) ES177484A1 (en)
FR (1) FR941331A (en)
GB (1) GB591495A (en)
NL (1) NL64921C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6146056A (en) * 1998-01-14 2000-11-14 Jennmar Corporation Channel and bearing plate assembly

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518178A (en) * 1947-11-05 1950-08-08 Automatic Elect Lab Antisidetone and line balancing substation circuits for telephone systems
US2732436A (en) * 1947-12-22 1956-01-24 Frequency in cycles per second
US2568150A (en) * 1948-06-15 1951-09-18 Bell Telephone Labor Inc Balancing network for subscribers' telephone sets
US2604543A (en) * 1950-11-09 1952-07-22 Bell Telephone Labor Inc Equalizer circuit
BE505815A (en) * 1950-12-27
DE886766C (en) * 1951-03-03 1953-08-17 Normalzeit G M B H Device to prevent unauthorized eavesdropping on telephone conversations
BE510745A (en) * 1951-04-18
DE1039104B (en) * 1951-04-18 1958-09-18 Int Standard Electric Corp Circuit arrangement for telephone stations to prevent overhearing one's own speech
DE1038118B (en) * 1951-04-26 1958-09-04 Int Standard Electric Corp Circuit arrangement for telephone stations to prevent overhearing one's own speech and room noise
BE539848A (en) * 1954-07-16
US3119063A (en) * 1961-01-13 1964-01-21 Gen Dynamics Corp Transmission line terminating impedance distinguishing circuit
DE1928434A1 (en) * 1969-06-04 1970-12-10 Siemens Ag Circuit arrangement for connecting direct current data transmission systems with low transmission voltage to a data exchange
NL7805416A (en) * 1978-05-19 1979-11-21 Philips Nv SELF-ADJUSTING FORK GEARS.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6146056A (en) * 1998-01-14 2000-11-14 Jennmar Corporation Channel and bearing plate assembly

Also Published As

Publication number Publication date
BE468046A (en)
GB591495A (en) 1947-08-20
ES177484A1 (en) 1947-05-01
US2387269A (en) 1945-10-23
NL64921C (en)

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