FR2289079A1 - Multi-station communication system - uses diode gates between combined microphone and loudspeaker units - Google Patents

Multi-station communication system - uses diode gates between combined microphone and loudspeaker units

Info

Publication number
FR2289079A1
FR2289079A1 FR7522457A FR7522457A FR2289079A1 FR 2289079 A1 FR2289079 A1 FR 2289079A1 FR 7522457 A FR7522457 A FR 7522457A FR 7522457 A FR7522457 A FR 7522457A FR 2289079 A1 FR2289079 A1 FR 2289079A1
Authority
FR
France
Prior art keywords
communication system
stations
gates
station communication
loudspeaker units
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.)
Granted
Application number
FR7522457A
Other languages
French (fr)
Other versions
FR2289079B1 (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.)
NEUMANN ELEKTRONIK GmbH
Original Assignee
NEUMANN ELEKTRONIK GmbH
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 NEUMANN ELEKTRONIK GmbH filed Critical NEUMANN ELEKTRONIK GmbH
Publication of FR2289079A1 publication Critical patent/FR2289079A1/en
Application granted granted Critical
Publication of FR2289079B1 publication Critical patent/FR2289079B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

This communication system has each station equipped with a repeater loudspeaker amplifier, microphone amplifier, call keys and tally-lamps. These stations are connected to a central unit that contains the matrix and gates. Each gate consists of a pair of back-to-back diodes in each of the two communication lines. The centre points of the diode pairs are connected together by a centre-tapped inductance so that the gates may be biased on or off. Transistor amplifiers are used to unlatch called-stations and initiate engaged-tally indications to other stations. Flashing call tallies are provided for alerting the called station.
FR7522457A 1974-07-17 1975-07-11 Multi-station communication system - uses diode gates between combined microphone and loudspeaker units Granted FR2289079A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2434321A DE2434321C3 (en) 1974-07-17 1974-07-17 Circuit arrangement for button-controlled intercom, intercom or loudspeaker systems

Publications (2)

Publication Number Publication Date
FR2289079A1 true FR2289079A1 (en) 1976-05-21
FR2289079B1 FR2289079B1 (en) 1982-03-26

Family

ID=5920787

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7522457A Granted FR2289079A1 (en) 1974-07-17 1975-07-11 Multi-station communication system - uses diode gates between combined microphone and loudspeaker units

Country Status (9)

Country Link
AT (1) AT341590B (en)
BE (1) BE831415A (en)
CH (1) CH596721A5 (en)
DE (1) DE2434321C3 (en)
ES (1) ES439298A1 (en)
FI (1) FI61111C (en)
FR (1) FR2289079A1 (en)
NO (1) NO141583C (en)
SE (1) SE7508032L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2837950C2 (en) * 1978-08-31 1986-11-13 Neumann Elektronik GmbH, 4330 Mülheim Switching device for a button-controlled exchange, counter or loudspeaker system
DE3418484C1 (en) * 1984-05-18 1985-08-29 Neumann Elektronik GmbH, 4330 Mülheim Talk-back device for a subscriber station of a key-controlled intercom system with line selection
DE4334906C2 (en) * 1993-10-13 1997-05-07 Neumann Elektronik Gmbh Device for the transmission of call and occupancy status signals from two-way or intercom systems with line selection via a two-wire transmission line

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1512811C3 (en) * 1967-04-27 1984-08-02 ANT Nachrichtentechnik GmbH, 7150 Backnang Circuit arrangement for testing the call station's own facilities in intercom systems

Also Published As

Publication number Publication date
FR2289079B1 (en) 1982-03-26
AT341590B (en) 1978-02-10
DE2434321C3 (en) 1983-12-08
DE2434321A1 (en) 1976-01-22
FI751974A (en) 1976-01-18
NO752541L (en) 1976-01-20
DE2434321B2 (en) 1977-01-20
SE7508032L (en) 1976-01-19
FI61111B (en) 1982-01-29
NO141583C (en) 1980-04-09
BE831415A (en) 1975-11-17
NO141583B (en) 1979-12-27
CH596721A5 (en) 1978-03-15
ES439298A1 (en) 1977-03-01
FI61111C (en) 1982-05-10
ATA482375A (en) 1977-06-15

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