ES177444A1 - CIRCUIT FOR SUBSCRIBER TELEPHONE DEVICES - Google Patents

CIRCUIT FOR SUBSCRIBER TELEPHONE DEVICES

Info

Publication number
ES177444A1
ES177444A1 ES0177444A ES177444A ES177444A1 ES 177444 A1 ES177444 A1 ES 177444A1 ES 0177444 A ES0177444 A ES 0177444A ES 177444 A ES177444 A ES 177444A ES 177444 A1 ES177444 A1 ES 177444A1
Authority
ES
Spain
Prior art keywords
circuit
subscriber telephone
telephone devices
parallel
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
ES0177444A
Other languages
Spanish (es)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES177444A1 publication Critical patent/ES177444A1/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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

Un circuito para aparatos telefónicos de abonado caracterizado por un par de rectificaciones metálicos conectados en paralelo y en sentido opuesto en paralelo con el receptor telefónico a fín de reducir los ruidos en el receptor por su acción de ofrecer una alta resistencia a las corrientes de conversación y resistencia comparativamente baja a los altos potenciales tales como los debidos a descargas o elevaciones repentinas.A circuit for subscriber telephone sets characterized by a pair of metallic rectifications connected in parallel and in the opposite direction in parallel with the telephone receiver in order to reduce the noise in the receiver by offering a high resistance to conversation currents and comparatively low resistance to high potentials such as those due to sudden surges or surges.

ES0177444A 1939-12-09 1947-03-31 CIRCUIT FOR SUBSCRIBER TELEPHONE DEVICES Expired ES177444A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE290147X 1939-12-09

Publications (1)

Publication Number Publication Date
ES177444A1 true ES177444A1 (en) 1947-05-01

Family

ID=3867251

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0177444A Expired ES177444A1 (en) 1939-12-09 1947-03-31 CIRCUIT FOR SUBSCRIBER TELEPHONE DEVICES

Country Status (2)

Country Link
CH (1) CH290147A (en)
ES (1) ES177444A1 (en)

Also Published As

Publication number Publication date
CH290147A (en) 1953-04-15

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