GB1534208A - Detector for a multifrequency signal receiver - Google Patents

Detector for a multifrequency signal receiver

Info

Publication number
GB1534208A
GB1534208A GB4431477A GB4431477A GB1534208A GB 1534208 A GB1534208 A GB 1534208A GB 4431477 A GB4431477 A GB 4431477A GB 4431477 A GB4431477 A GB 4431477A GB 1534208 A GB1534208 A GB 1534208A
Authority
GB
United Kingdom
Prior art keywords
frequency
detected
output
detector
paths
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
GB4431477A
Other languages
English (en)
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
Publication of GB1534208A publication Critical patent/GB1534208A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
GB4431477A 1976-11-05 1977-10-25 Detector for a multifrequency signal receiver Expired GB1534208A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7633463A FR2370386A1 (fr) 1976-11-05 1976-11-05 Melangeur pour recepteur de signaux multifrequences

Publications (1)

Publication Number Publication Date
GB1534208A true GB1534208A (en) 1978-11-29

Family

ID=9179600

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4431477A Expired GB1534208A (en) 1976-11-05 1977-10-25 Detector for a multifrequency signal receiver

Country Status (2)

Country Link
FR (1) FR2370386A1 (enExample)
GB (1) GB1534208A (enExample)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1420538A (fr) * 1964-10-28 1965-12-10 Ericsson Telefon Sfe Fse Procédé et dispositif de détection de signaux de fréquence
US3686576A (en) * 1970-12-18 1972-08-22 Ibm Parallel tone detector
FR2269261B1 (enExample) * 1974-04-24 1976-12-17 Cit Alcatel

Also Published As

Publication number Publication date
FR2370386B1 (enExample) 1982-09-24
FR2370386A1 (fr) 1978-06-02

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee