GB460428A - Improvements in or relating to the transmission of ringing signals in carrier frequency telephony systems - Google Patents

Improvements in or relating to the transmission of ringing signals in carrier frequency telephony systems

Info

Publication number
GB460428A
GB460428A GB23073/36A GB2307336A GB460428A GB 460428 A GB460428 A GB 460428A GB 23073/36 A GB23073/36 A GB 23073/36A GB 2307336 A GB2307336 A GB 2307336A GB 460428 A GB460428 A GB 460428A
Authority
GB
United Kingdom
Prior art keywords
relating
transmission
carrier frequency
telephony systems
ringing signals
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
Application number
GB23073/36A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB460428A publication Critical patent/GB460428A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

460,428. Carrier telephone ringing arrangements. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Aug. 21, 1936, No. 23073. Convention date, Aug. 24, 1935. [Class 40 (v)] To ensure that a relay 8 controlling the ringing circuit at a carrier telephone receiving station shall respond to deliberate but not to minor variations of carrier current amplitude, it is included in the anode circuit of an amplifier valve 1 preceding the demodulator 3 and having its grid voltage determined by the voltage drop in a resistance 7 produced by rectifying signals at 6.
GB23073/36A 1935-08-24 1936-08-21 Improvements in or relating to the transmission of ringing signals in carrier frequency telephony systems Expired GB460428A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE460428X 1935-08-24

Publications (1)

Publication Number Publication Date
GB460428A true GB460428A (en) 1937-01-27

Family

ID=6539725

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23073/36A Expired GB460428A (en) 1935-08-24 1936-08-21 Improvements in or relating to the transmission of ringing signals in carrier frequency telephony systems

Country Status (1)

Country Link
GB (1) GB460428A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753441C (en) * 1937-12-27 1944-08-03 Philips Patentverwaltung Signal receiver for carrier wave telephony systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753441C (en) * 1937-12-27 1944-08-03 Philips Patentverwaltung Signal receiver for carrier wave telephony systems

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