GB1106337A - Voice-frequency pushbutton dialling telephone system - Google Patents

Voice-frequency pushbutton dialling telephone system

Info

Publication number
GB1106337A
GB1106337A GB5229065A GB5229065A GB1106337A GB 1106337 A GB1106337 A GB 1106337A GB 5229065 A GB5229065 A GB 5229065A GB 5229065 A GB5229065 A GB 5229065A GB 1106337 A GB1106337 A GB 1106337A
Authority
GB
United Kingdom
Prior art keywords
speech
signal
immune
voice
frequency
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
GB5229065A
Inventor
Otto Baade
Lorenz Gasser
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to GB5229065A priority Critical patent/GB1106337A/en
Publication of GB1106337A publication Critical patent/GB1106337A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Telephone Function (AREA)

Abstract

1,106,337. Automatic exchange systems. INTERNATIONAL STANDARD ELECTRIC CORPORATION. 8 May, 1967, No. 52290/65. Heading H4K. Digit signals transmitted by a subscriber's keysender each comprise a D.C. signal and a combination of speech immune V.F. signalsoutband signals-which are evaluated in the exchange by a non-speech immune V.F receiver which is switched on by the D.C. signal or alternatively by a speech immune V.F. receiver in which case the D.C. signal is ignored. The D.C. signal is a brief loop interruption before each digit V.F. combination and is detected at the exchange as a transient oscillation in the V.F. range of an amplitude larger than the amplitude of any speech induced oscillations.
GB5229065A 1967-05-08 1967-05-08 Voice-frequency pushbutton dialling telephone system Expired GB1106337A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5229065A GB1106337A (en) 1967-05-08 1967-05-08 Voice-frequency pushbutton dialling telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5229065A GB1106337A (en) 1967-05-08 1967-05-08 Voice-frequency pushbutton dialling telephone system

Publications (1)

Publication Number Publication Date
GB1106337A true GB1106337A (en) 1968-03-13

Family

ID=10463368

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5229065A Expired GB1106337A (en) 1967-05-08 1967-05-08 Voice-frequency pushbutton dialling telephone system

Country Status (1)

Country Link
GB (1) GB1106337A (en)

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