US2232063A - Arrangement for the transmission of intelligence - Google Patents

Arrangement for the transmission of intelligence Download PDF

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Publication number
US2232063A
US2232063A US285848A US28584839A US2232063A US 2232063 A US2232063 A US 2232063A US 285848 A US285848 A US 285848A US 28584839 A US28584839 A US 28584839A US 2232063 A US2232063 A US 2232063A
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US
United States
Prior art keywords
intelligence
carrier
relay
transmission
call signal
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
US285848A
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English (en)
Inventor
Hagen Wolfgang
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 US2232063A publication Critical patent/US2232063A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/16—Monitoring arrangements

Definitions

  • modulating circuits have in general been used in which the carrier is suppressed so that it is transmitted neither in interruptions in use nor during the transmission of intelligence.
  • a means using the carrier can be employed to transmit the call signal, in which means, for example, a. distortion of the symmetry of the modulation circuit is fed to the outgoing line.
  • the modulation circuits must in all these cases be so regulated, that no carrier frequency is transmitted in a condition of rest, that is, the modulation circuit, must as a rule be of bridge design and be constructed absolutely symmetrical.
  • the present invention deals with the problem 520 of testing for symmetry circuits employing the same carrier frequency for two-way intelligence trafllc so that from the transmitter to the receiver of the same device the carrier frequency is the same throughout.
  • the unsymmetry which is caused by the call signal release is indicated in the receiving set of the return traffic.
  • An intermediate relay station is shown in which the 30 regular two-way trafiic from the lines a and b is fed over four-line carrier frequency transmission, according to which it works in both speaking directions of the separate lines with the same carrier frequency and according to which the modulation of the carrier and one sideband are suppressed.
  • the low frequency coming in on the lines a and b is directed by the branch G into the equivalent line N and into the modulator M through the filter F.
  • This modulation circuit is so symmetrically energized that the carrier, generated by oscillator T, is not permittedtoleave the modulator.
  • the impedances WI and W2, of which WI is variable, are provided to set the modulator for symmetry.
  • the call signal paratus the received keyed carrier frequency is fed through a special amplifier Va and the call signal receiving tube V. This tube is heavily biased negatively so that in a condition of rest no plate current flows. As soon as the keyed carrier frequency reaches the grid, it produces a plate current which flows to the relay E. This relay is so time-delayed that its contact during the whole call signal operation stays closed.
  • the contact el of the relay E operates of itself to interrupt the plate current.
  • the armature of the relay E is operated mechanically only upon the action of the call signal frequency and vibrates independent of the keyed frequency of the carrier.
  • This relay has another contact e2, which changes the polarity of the transformer U, connected to lines (1. and b, from positive to negative and therefore produces in it an alternating current.
  • the relay H lies in'this circuit and, as long as current flows in it in a condition of rest, it is picked up. According to the switching operation of 62 a current is likewise introduced into the second winding of H. When the two windings of the relay H are energized in opposite relation, the armature drops back to normal position. The contact h then operates, releases the relay R from the subscriber line a and b, and connects in the transformer.
  • the call signal results from the suppression of a keying operation, which the contact 1' usually accomplishes. It is thus possible to impress the carrier without interruption upon the line as a call signal.
  • the relay E is replaced by an alarm or ringer in the call receiver.
  • a circuit for carrier frequency transmission of intelligence comprising transmitting and receiving equipment operating upon the same carrier frequency, having a symmetrical modulation. stage adapted to suppress the said carrier, and a connection system for terminating the normal output and input systems of said transmitting and receiving equipment and for connecting the WOLFGANG HAGEN.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
US285848A 1938-07-22 1939-07-22 Arrangement for the transmission of intelligence Expired - Lifetime US2232063A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE210928X 1938-07-22

Publications (1)

Publication Number Publication Date
US2232063A true US2232063A (en) 1941-02-18

Family

ID=5799965

Family Applications (1)

Application Number Title Priority Date Filing Date
US285848A Expired - Lifetime US2232063A (en) 1938-07-22 1939-07-22 Arrangement for the transmission of intelligence

Country Status (3)

Country Link
US (1) US2232063A (en))
CH (1) CH210928A (en))
NL (1) NL54077C (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE865006C (de) * 1941-11-29 1953-01-29 Siemens Ag Schaltungsanordnung zur Betriebsueberwachung von Traegerfrequenzsystemen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE865006C (de) * 1941-11-29 1953-01-29 Siemens Ag Schaltungsanordnung zur Betriebsueberwachung von Traegerfrequenzsystemen

Also Published As

Publication number Publication date
NL54077C (en))
CH210928A (de) 1940-08-15

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