GB1049476A - Voice-frequency key-dialling method - Google Patents

Voice-frequency key-dialling method

Info

Publication number
GB1049476A
GB1049476A GB4431164A GB4431164A GB1049476A GB 1049476 A GB1049476 A GB 1049476A GB 4431164 A GB4431164 A GB 4431164A GB 4431164 A GB4431164 A GB 4431164A GB 1049476 A GB1049476 A GB 1049476A
Authority
GB
United Kingdom
Prior art keywords
signal
receiver
signals
voice
dialling
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
GB4431164A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1049476A publication Critical patent/GB1049476A/en
Expired legal-status Critical Current

Links

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
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1,049,476. Voice-frequency signalling in telephone exchange systems. STANDARD TELEPHONES & CABLES Ltd. Oct. 30, 1964 [Nov. 5, 1963], No. 44311/64. Heading H4K. In a telephone exchange system using V.F. dialling signals, additional V.F. signals may be sent during a conversation, such as for recall or transfer, and to ensure speech is unable to simulate these signals they are superimposed upon a D.C. signal, produced by a change in line current, which is also transmitted by the subscriber's keying action but commencing in advance of the V.F. signal. Associated with each exchange link is a wide-band V.F. receiver which is enabled by a D.C. responsive device upon the receipt of the D.C. signal. The receiver then generates an output appropriate to the received V.F. code signal. If a transfer signal is sent it may be succeeded by dialling signals so a dial pulse receiver is seized, this being prevented during the call setting by a signal from the register, which also disables the D.C. responsive device and wide-band V.F. receiver when in use.
GB4431164A 1963-11-05 1964-10-30 Voice-frequency key-dialling method Expired GB1049476A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST21276A DE1192276B (en) 1963-11-05 1963-11-05 Signal method for touch dialing with tone frequency

Publications (1)

Publication Number Publication Date
GB1049476A true GB1049476A (en) 1966-11-30

Family

ID=7458930

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4431164A Expired GB1049476A (en) 1963-11-05 1964-10-30 Voice-frequency key-dialling method

Country Status (5)

Country Link
CH (1) CH437437A (en)
DE (1) DE1192276B (en)
GB (1) GB1049476A (en)
NL (1) NL6412743A (en)
SE (1) SE300837B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1537837B1 (en) * 1967-09-28 1970-11-12 Siemens Ag Circuit arrangement for frequency-selective dial number plate receivers in telecommunications, in particular telephone systems

Also Published As

Publication number Publication date
NL6412743A (en) 1965-05-06
DE1192276B (en) 1965-05-06
SE300837B (en) 1968-05-13
CH437437A (en) 1967-06-15

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