GB890454A - Improvements relating to voice-frequency signal detectors - Google Patents

Improvements relating to voice-frequency signal detectors

Info

Publication number
GB890454A
GB890454A GB4023659A GB4023659A GB890454A GB 890454 A GB890454 A GB 890454A GB 4023659 A GB4023659 A GB 4023659A GB 4023659 A GB4023659 A GB 4023659A GB 890454 A GB890454 A GB 890454A
Authority
GB
United Kingdom
Prior art keywords
way
voice
frequency signal
transformers
nov
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
GB4023659A
Inventor
Daniel Lawrence King
Eric Gibbon Hitch
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB4023659A priority Critical patent/GB890454A/en
Publication of GB890454A publication Critical patent/GB890454A/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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

890,454. Two-way transmissions. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Nov. 10, 1960 [Nov. 26, 1959], No. 40236/59, Class 40 (4). In an arrangement wherein a two-way line L is coupled by way of transformers T1, T3 with an interposed matching attenuator P1 to a reversible amplifier A and a loud-speaker/ microphone LM and by way of a transformer T2 and a matching attenuator P2 to a V.F. receiver D which is required to respond to a release signal, the V.F. receiver is guarded against operation by speech from the instrument LM by a connection through a resistance R11 which supplies currents in antiphase with those induced through the transformer T2. The transformers T1, T2 are given suitable turn ratios and an adjustable resistance RV is provided to obtain a satisfactory balance at the signalling frequency.
GB4023659A 1959-11-26 1959-11-26 Improvements relating to voice-frequency signal detectors Expired GB890454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4023659A GB890454A (en) 1959-11-26 1959-11-26 Improvements relating to voice-frequency signal detectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4023659A GB890454A (en) 1959-11-26 1959-11-26 Improvements relating to voice-frequency signal detectors

Publications (1)

Publication Number Publication Date
GB890454A true GB890454A (en) 1962-02-28

Family

ID=10413892

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4023659A Expired GB890454A (en) 1959-11-26 1959-11-26 Improvements relating to voice-frequency signal detectors

Country Status (1)

Country Link
GB (1) GB890454A (en)

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