US2460475A - Arrangement for changing over the speaking direction in loud-speaker duplex systems - Google Patents

Arrangement for changing over the speaking direction in loud-speaker duplex systems Download PDF

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Publication number
US2460475A
US2460475A US535297A US53529744A US2460475A US 2460475 A US2460475 A US 2460475A US 535297 A US535297 A US 535297A US 53529744 A US53529744 A US 53529744A US 2460475 A US2460475 A US 2460475A
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United States
Prior art keywords
arrangement
relay
loud
speaker
over
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Expired - Lifetime
Application number
US535297A
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English (en)
Inventor
Tschumi Otto
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.)
Autophon AG
Original Assignee
Autophon AG
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Publication date
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Publication of US2460475A publication Critical patent/US2460475A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Definitions

  • the invention relates to arrangements for changing over the speaking direction in. loud pea rrdunlexsystem
  • the determination of the speaking direction in loud speaker duplex systems was. hitherto effected by an additional key which, in most cases, was
  • Object of the present invention is an arrangement for changing-over loud speaker duplex systems which is characterized in that the changingover is effected by a short-time change of an electric continuous state.
  • This state may be of any kind, that is, it may consist in the fact that a more or less intense current flows through the switch devices, or that the latter are without current. Therefore the short-time change of the electric continuous state consists in a current amplification, a current reduction, a current impulse or an interruption.
  • Fig. 1 is a diagram of the subscribers device, while Figs. 2 to 4 illustrate in a diagrammatic way details of the main station.
  • the subscriber desiring to change the speaking direction in the example illustrated dial s the number 1 on the existing calling dial, i. e., he interrupts a direct current for a short time.
  • This use of the calling dial has the additional advantage that no further switching devices need be added to the subscribers station in that the existing means are sufficient. 7
  • the transducer EW is connected withthe terminals a, 11 over the amplifier V which can be alternately switched-in The'rsubor'di'n'ation "er the. stations result- 1 Claim. (01. 139.51
  • the terminals wand b are connected with each other by the impedance coit-Dr.
  • the eentre ofthis coil Dr is earthed dyer the switch e2,a. rectifier arrangement with the relays-1U..-Eiand,the o.ptical signal SZ, and
  • switch s2 respectively with the negative pole of a non-illustratedbattery earthed en the positive sideor positive .p'ole'o'f a non-illustrated battery earthed on the negative; side. respectively.
  • Fig. .3, illustrates thear'ranglement of a relay controlling. the switches. 81,. s and s3.
  • Thisv relay is, on the one side, connected to the negative pole of a battery earthed on the positive side, and, on the other side, earthed over the switch II and the switches n and '1 connected in parallel.
  • Fig. 4 shows the circuit of the time-delay relay II controlled by the switches 1/2 and 9'2 connected in series.
  • the contacts 61 and eg have been closed in a non-illustrated manner, which, on the one side, results in the switching-in of the amplifier V and, on the other side, in the opening of a direct current path from the middle of the impedance coil Dr over the rectifier arrangement to the earthed contact of the impulse contact 2.
  • the terminals 11, b in Fig. 1 are connected over pre-selectors or call finders or other selectors with the terminals 0,2, In in Fig. 2 and the terminals of the nonillustrated called station.
  • the speaking direction can at will be changed by the calling or the called party by dialling the number 1 on the calling dial. If it is, for instance, the person calling who actuates the dial in the manner aforesaid, the impulse con-' tact is interrupted for a short time and the sparking contact 7c short-circuited during the selecting process.
  • the short-time interruption of the current in the previously mentioned circuit of the calling station does not result in a dropping of the relays U and E which is delayed by the parallel connection of rectifier elements, but only in a dropping of relay J. This dropping closes the circuit of the switch relay S in Fig.3which, in its turn, operates the contacts s1, s2 and .93.
  • the contact s3 serves the purpose of bringing the relay Number S back into initial position provided that this is not already the case. What I claim is:
  • a loud speaker duplex system comprising several subscribers stations, an arrangement for changing over the speaking direction including a transducer and a dial in each Of said sub scribers stations, dial contacts operated by the dial, a relay arrangement, a battery, contacts for connecting a subscriber station, contacts for changing over the speaking direction, a rectifier arrangement, a bridge relay in said rectifier arrangement operating said contacts for connect ing a subscriber station, a shunt relay shunting a part of said rectifier arrangement and oper- REFERENCES CITED

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
US535297A 1942-12-04 1944-05-12 Arrangement for changing over the speaking direction in loud-speaker duplex systems Expired - Lifetime US2460475A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2460475X 1942-12-04

Publications (1)

Publication Number Publication Date
US2460475A true US2460475A (en) 1949-02-01

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Family Applications (1)

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US535297A Expired - Lifetime US2460475A (en) 1942-12-04 1944-05-12 Arrangement for changing over the speaking direction in loud-speaker duplex systems

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US (1) US2460475A (de)
CH (1) CH258989A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577806A (en) * 1945-07-09 1951-12-11 Richard C Lindberg Network for intercommunication system
US2883456A (en) * 1953-04-29 1959-04-21 Int Standard Electric Corp Circuit arrangement for intercommunication systems

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044305A (en) * 1935-07-01 1936-06-16 Turner Company Communication system
US2102903A (en) * 1933-12-30 1937-12-21 Firm Le Telephone Prive Nat Sa Loud-speaking and amplified microphone telephone exchange
US2192540A (en) * 1938-12-02 1940-03-05 Creti Marcello Telephone system
US2214804A (en) * 1939-07-18 1940-09-17 Bell Telephone Labor Inc Two-way communication system
US2224698A (en) * 1937-12-23 1940-12-10 Ass Telephone & Telegraph Co Telephone system
US2249456A (en) * 1940-03-25 1941-07-15 Webster Electric Co Inc Communication system
US2369351A (en) * 1943-05-01 1945-02-13 Automatic Elect Lab Telephone substation circuit
US2369144A (en) * 1943-05-10 1945-02-13 Automatic Elect Lab Telephone substation circuit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102903A (en) * 1933-12-30 1937-12-21 Firm Le Telephone Prive Nat Sa Loud-speaking and amplified microphone telephone exchange
US2044305A (en) * 1935-07-01 1936-06-16 Turner Company Communication system
US2224698A (en) * 1937-12-23 1940-12-10 Ass Telephone & Telegraph Co Telephone system
US2192540A (en) * 1938-12-02 1940-03-05 Creti Marcello Telephone system
US2214804A (en) * 1939-07-18 1940-09-17 Bell Telephone Labor Inc Two-way communication system
US2249456A (en) * 1940-03-25 1941-07-15 Webster Electric Co Inc Communication system
US2369351A (en) * 1943-05-01 1945-02-13 Automatic Elect Lab Telephone substation circuit
US2369144A (en) * 1943-05-10 1945-02-13 Automatic Elect Lab Telephone substation circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577806A (en) * 1945-07-09 1951-12-11 Richard C Lindberg Network for intercommunication system
US2883456A (en) * 1953-04-29 1959-04-21 Int Standard Electric Corp Circuit arrangement for intercommunication systems

Also Published As

Publication number Publication date
CH258989A (de) 1948-12-31

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