US2290909A - Arrangement for transmitting current impulses - Google Patents

Arrangement for transmitting current impulses Download PDF

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Publication number
US2290909A
US2290909A US269101A US26910139A US2290909A US 2290909 A US2290909 A US 2290909A US 269101 A US269101 A US 269101A US 26910139 A US26910139 A US 26910139A US 2290909 A US2290909 A US 2290909A
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US
United States
Prior art keywords
relay
arrangement
current
resistance
current impulses
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 - Lifetime
Application number
US269101A
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English (en)
Inventor
Hettenhausen Georg
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2290909A publication Critical patent/US2290909A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Definitions

  • ringing signals which, for instance, are formed of an alternating current of low frequency and produced with the aid of a magneto.
  • a relay is arranged to affect the carrier frequency in accordance with the ringing frequency.
  • a relay of normal or standard type is not possible, because such a relay would respond to each half-Wave of the low frequency ringing current, whereby the impulse succession on the carrier frequency side would be double that of the low frequency side.
  • a polarized relay might be employed, because it would then be possible to fulfil the said requirement, if only one contact of this relay were used for affecting the carrier frequency. In this case, however, the disadvantage arises that it will be unknown on which of the contacts the polarized relay would remain resting, that is, the relay might happen to remain in its ringing state. If, in order to avoid this drawback, an electric or mechanical unilateral bias voltage were provided, the sensitivity of the arrangement would be impaired thereby.
  • a non-polarized relay and a rectifier connected in advance thereof have been used.
  • the relay in this case only responds to each second half-wave.
  • the relay in consequence of a great time constant determining the release thereof, may happen not to drop its armature during the period of no-current. As a result, the ringing frequency will not be properly transmitted to the receiving side.
  • the invention proposes to provide a resistance connected in parallel with the rectifier which in its turn is arranged in series connection with the said relay.
  • This resistance is connected in shunt with the rectifier and is calculated to allow a comparatively small current amplitude to flow through the relay.
  • This current amplitude acts to reverse the polarity of the field in the core of the relay, that is to say, the core is demagnetized without the relay responding.
  • a condenser or a resistance-condenser combination may be connected in shunt with the rectifier.
  • FIG. 1 shows the circuit arrangement of one embodiment of the invention
  • Figs. 2 and 3 represent current curves which serve to explain the operation of arrangements as provided by the invention
  • Fig. 4 shows a modified circuit similar to that of Fig. 1.
  • the keying frequency is conveyed to a relay E having a contact e.
  • a rectifier G Connected in advance of relay E is a rectifier G which, in accordance with the invention, is bridged over by a resistance A, such as a high ohmic resistance, for instance.
  • a resistance A such as a high ohmic resistance
  • Fig. 4 the element A of Fig. 1 is replaced by a resistance I and condenser 2 in parallel and source F is shown as a direct current source instead of an alternating current source.
  • This modified circuit can be used in place of that shown in Fig. 1 and will produce substantially similar results.
  • the arrangement may be employed also in the case of ringing over low frequency talking lines, and it may be employed whenever in the case of an impulse transmission a contact is desired to be continuously held in its open or closed position.
  • An arrangement for converting alternating ringing current into current impulses of equal frequency comprising a rectifier and resistance in shunt combination, a non-polarized relay connected in series with said combination to form a series circuit, means for supplying said alternating ringing current across said series circuit and an impulse producing circuit controlled by said relay.
  • said impulse producing circuit comprises a course of direct current and means controlled by said relay for impressing direct current impulses from said source on a signal line.
  • said impulse producing circuit comprises a source of carrier frequency and means controlled by said relay for impressing carrier frequency impulses from said source on said signal line.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)
US269101A 1938-02-12 1939-04-21 Arrangement for transmitting current impulses Expired - Lifetime US2290909A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0094222 1938-02-12

Publications (1)

Publication Number Publication Date
US2290909A true US2290909A (en) 1942-07-28

Family

ID=7287832

Family Applications (1)

Application Number Title Priority Date Filing Date
US269101A Expired - Lifetime US2290909A (en) 1938-02-12 1939-04-21 Arrangement for transmitting current impulses

Country Status (4)

Country Link
US (1) US2290909A (en:Method)
BE (1) BE432671A (en:Method)
CH (1) CH208452A (en:Method)
FR (1) FR850207A (en:Method)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768274A (en) * 1953-10-27 1956-10-23 Gen Electric Variable resistor control system
US3389386A (en) * 1964-09-30 1968-06-18 Technical Marketing Associates Rellable monitoring system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768274A (en) * 1953-10-27 1956-10-23 Gen Electric Variable resistor control system
US3389386A (en) * 1964-09-30 1968-06-18 Technical Marketing Associates Rellable monitoring system

Also Published As

Publication number Publication date
BE432671A (en:Method)
CH208452A (de) 1940-01-31
FR850207A (fr) 1939-12-11

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