US2210957A - Signal receiver for carrier wave systems - Google Patents

Signal receiver for carrier wave systems Download PDF

Info

Publication number
US2210957A
US2210957A US246457A US24645738A US2210957A US 2210957 A US2210957 A US 2210957A US 246457 A US246457 A US 246457A US 24645738 A US24645738 A US 24645738A US 2210957 A US2210957 A US 2210957A
Authority
US
United States
Prior art keywords
circuit
carrier
signal
tube
signal 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 - Lifetime
Application number
US246457A
Other languages
English (en)
Inventor
Thomas Samuel Skillman
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2210957A publication Critical patent/US2210957A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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

Definitions

  • This invention relates to carrier-telephony systems especially multichannel systems in which the signals, such as calling currents or dialling impulses are transmitted by the emission of the 5 carrier, which is suppressed during the transmission of the conversation, or by a signal current lying in the side-band.
  • a signal receiver which comprises a filter or an oscillatory circuit tuned to the carrier-frequency or to the frequency of the signalcurrent lying in the side-band. After selection the signal is supplied to a rectifier and rectified. The rectified current controls a relay which"op-.
  • This amplifier can be dispensed with if, ac-
  • the relay operating the signal-current circuit is interposed in the anode circuit of alow-frequency amplifying tube in the 'receiving channel which tube is provided for amplification of the demodulated conversation, the grid voltage of said tube being controlled by the rectified signal current.
  • the side-band carrying the conversation coming in over the receiving line L3 is selected by means of a filter BFz, and demodulated in the demodulator DM while adding the carrier p2 of the generator G11 and after amplification in ;the amplifying tube V1 supplied as a low-frequency conversation to the line L1.
  • Signal impulses of carrier frequency p: coming in over the line In are supplied to a tube V2.
  • the anode-circuit of this tube has coupled to it a mixing circuit comprising a rectifier F1, an
  • auxiliary generator H having a frequency p: and the primary winding of a transformer T1.
  • An oscillatory circuit LC tuned to the difference frequency pa-pz is connected to the secondary winding of the said transformer.
  • the voltage 5 set up at the coil L is rectified by means of a second rectifier F2 as the result of which a direct voltage drop is produced across the resistance W.
  • This resistance W is'connected in the grid circuit of the amplifying tube V1 provided for. the amplification of the demodulated received side band.
  • the anode-circuit of said tube V1 comprises a relay R2 which operates the signal current circuit I.
  • the relay R2 Upon reception of signal impulses such a voltage drop is produced at the resistance W in the grid circuit of the amplifying tube V1 that the anode current of the tube V1 is entirely or partly suppressed, the relay R2 is caused to respond and the signals are transmitted to the signalling circuit J.
  • the signals are transmitted by transmission of the carrier-wave which is suppressed during the transmission of the conversation.
  • the invention also applies to carrier systems, wherein the signals are transmitted by means of a signal-current lying in the side-band.
  • a carrier-telephony signal receiver adapted to receive signal currents which are transmitted by the emission of the carrier, means for filtering the signal currents received, means for rectifying the filtered currents, means for amplifying the speech currents including a lowfrequency amplifying tube inthe receiving channel and having a grid, a plate circuit for said tube, means for controlling the grid bias of. said tube by the rectified signal currents, a signallin circuit, and a relay connected to control sail signalling circuit and controlled by the plate current of said plate circuit.
  • a carrier-telephony signal receiver adapted to receive signal currents which are transmitted by the emission of the carrier,.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Noise Elimination (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Near-Field Transmission Systems (AREA)
US246457A 1937-12-27 1938-12-17 Signal receiver for carrier wave systems Expired - Lifetime US2210957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP2125D DE1080615B (de) 1937-12-27 1937-12-27 Signalempfaenger fuer Traegerwellentelephoniesysteme

Publications (1)

Publication Number Publication Date
US2210957A true US2210957A (en) 1940-08-13

Family

ID=7357758

Family Applications (1)

Application Number Title Priority Date Filing Date
US246457A Expired - Lifetime US2210957A (en) 1937-12-27 1938-12-17 Signal receiver for carrier wave systems

Country Status (7)

Country Link
US (1) US2210957A (de)
BE (3) BE431842A (de)
CH (1) CH206315A (de)
DE (2) DE1080615B (de)
FR (2) FR848015A (de)
GB (3) GB523067A (de)
NL (1) NL52757C (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564378A (en) * 1946-05-06 1951-08-14 Punch Engineering Pty Ltd Carrier system signaling circuits
US2600226A (en) * 1947-04-29 1952-06-10 Hartford Nat Bank & Trust Co Device to minimize interference between dial impulses in a carrier system
US2613279A (en) * 1949-09-02 1952-10-07 Cie Ind Des Telephones Ringing and regulating device for carrier current transmission systems
US2721979A (en) * 1950-07-07 1955-10-25 Westinghouse Air Brake Co Switching and control means for carrier signaling and communication equipments
US3020352A (en) * 1956-04-26 1962-02-06 Philips Corp Single sideband equipment for speech transmission

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT91298B (de) * 1915-12-01 1923-02-10 Western Electric Co Ltd Einrichtung zum gleichzeitigen Telegraphieren und Telephonieren mit oder ohne Leitungsdraht.
US1484405A (en) * 1920-01-12 1924-02-19 Western Electric Co Signaling system
DE497115C (de) * 1928-12-29 1930-05-02 Lorenz Akt Ges C Anordnung zur Erzielung hoher Selektivitaet elektrischer Empfangseinrichtungen
AT140823B (de) * 1932-12-22 1935-02-25 Siemens Ag Merfachübertragungssytem mitells Trägerströmen, insbesondere für Kabelleitungen.
GB460428A (en) * 1935-08-24 1937-01-27 Philips Nv Improvements in or relating to the transmission of ringing signals in carrier frequency telephony systems

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564378A (en) * 1946-05-06 1951-08-14 Punch Engineering Pty Ltd Carrier system signaling circuits
US2600226A (en) * 1947-04-29 1952-06-10 Hartford Nat Bank & Trust Co Device to minimize interference between dial impulses in a carrier system
US2613279A (en) * 1949-09-02 1952-10-07 Cie Ind Des Telephones Ringing and regulating device for carrier current transmission systems
US2721979A (en) * 1950-07-07 1955-10-25 Westinghouse Air Brake Co Switching and control means for carrier signaling and communication equipments
US3020352A (en) * 1956-04-26 1962-02-06 Philips Corp Single sideband equipment for speech transmission

Also Published As

Publication number Publication date
GB523068A (en) 1940-07-04
GB504711A (en) 1939-04-28
FR848016A (fr) 1939-10-20
DE753441C (de) 1944-08-03
NL52757C (de)
BE431842A (de)
BE431843A (de)
CH206315A (de) 1939-07-31
DE1080615B (de) 1960-04-28
GB523067A (en) 1940-07-04
FR848015A (fr) 1939-10-20
BE431870A (de)

Similar Documents

Publication Publication Date Title
GB539793A (en) Improvements in or relating to fading compensation in radio receivers
US2065826A (en) Signaling
US1922059A (en) Radio receiving system
US2210957A (en) Signal receiver for carrier wave systems
US2572074A (en) Voice-frequency signaling system
US2362958A (en) Radio receiver system
US2215482A (en) Carrier wave telephony
US2215483A (en) Carrier wave telephony system
US2496784A (en) Receiver circuit-arrangement for low-frequency or carrier wave telephony systems
US2306121A (en) Signaling arrangement for carrier frequency systems
US1361522A (en) Plural modulation system
US2138613A (en) Signaling system
US2117721A (en) Telephone system
US1752303A (en) Interference neutralizer for alternating-current telegraph systems
US1550658A (en) Ringing circuits for multiplex signaling
US2468555A (en) Multiple modulation carrier frequency telephone system
US1968106A (en) Transmission system
US1932679A (en) Electrical signaling system
US1942580A (en) Wireless transmission of telegraph impulses
US1511015A (en) Transmission regulation
US2101256A (en) Carrier telegraph receiver
US1463199A (en) Ringing arrangement for multiplex circuits
US1463200A (en) Ringing arrangement for multiplex circuits
US1559753A (en) Signaling system
US1971679A (en) Transmission control circuits