GB542643A - Telephone set circuits - Google Patents

Telephone set circuits

Info

Publication number
GB542643A
GB542643A GB8841/40A GB884140A GB542643A GB 542643 A GB542643 A GB 542643A GB 8841/40 A GB8841/40 A GB 8841/40A GB 884140 A GB884140 A GB 884140A GB 542643 A GB542643 A GB 542643A
Authority
GB
United Kingdom
Prior art keywords
transmitter
resistance
impedance
normally
receiver
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
GB8841/40A
Other languages
English (en)
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority claimed from US278411A external-priority patent/US2287998A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB542643A publication Critical patent/GB542643A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
GB8841/40A 1939-06-10 1940-05-17 Telephone set circuits Expired GB542643A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US278411A US2287998A (en) 1939-06-10 1939-06-10 Telephone circuit
US434372A US2332643A (en) 1939-06-10 1942-03-12 Telephone set circuit

Publications (1)

Publication Number Publication Date
GB542643A true GB542643A (en) 1942-01-21

Family

ID=26959081

Family Applications (2)

Application Number Title Priority Date Filing Date
GB8841/40A Expired GB542643A (en) 1939-06-10 1940-05-17 Telephone set circuits
GB12490/41A Expired GB544364A (en) 1939-06-10 1940-05-17 Telephone circuits

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB12490/41A Expired GB544364A (en) 1939-06-10 1940-05-17 Telephone circuits

Country Status (5)

Country Link
US (1) US2332643A (enrdf_load_stackoverflow)
BE (1) BE439637A (enrdf_load_stackoverflow)
CH (1) CH222392A (enrdf_load_stackoverflow)
FR (1) FR866096A (enrdf_load_stackoverflow)
GB (2) GB542643A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE886766C (de) * 1951-03-03 1953-08-17 Normalzeit G M B H Einrichtung zur Verhinderung des unerlaubten Abhoerens von Telephongespraechen
DE1016760B (de) * 1953-07-07 1957-10-03 Deutsche Bundespost Schaltungsanordnung zur Volumenregelung in Fernsprechteilnehmer-Anschlussleitungen
DE1096424B (de) * 1956-03-29 1961-01-05 Western Electric Co Schaltungsanordnung fuer Fernsprechteilnehmerstationen mit einem aus der Amtsbatterie gespeisten Transistorverstaerker

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559778A (en) * 1948-04-02 1951-07-10 Modern Telephone Corp Intercommunication telephone system
US2764731A (en) * 1953-05-06 1956-09-25 Bell Telephone Labor Inc Thermistor network
US3143700A (en) * 1960-08-12 1964-08-04 Computing Devices Canada Resistance networks for stabilizing phase shift in resolvers and the like

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE886766C (de) * 1951-03-03 1953-08-17 Normalzeit G M B H Einrichtung zur Verhinderung des unerlaubten Abhoerens von Telephongespraechen
DE1016760B (de) * 1953-07-07 1957-10-03 Deutsche Bundespost Schaltungsanordnung zur Volumenregelung in Fernsprechteilnehmer-Anschlussleitungen
DE1096424B (de) * 1956-03-29 1961-01-05 Western Electric Co Schaltungsanordnung fuer Fernsprechteilnehmerstationen mit einem aus der Amtsbatterie gespeisten Transistorverstaerker

Also Published As

Publication number Publication date
GB544364A (en) 1942-04-09
BE439637A (enrdf_load_stackoverflow)
FR866096A (fr) 1941-06-16
US2332643A (en) 1943-10-26
CH222392A (fr) 1942-07-15

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