GB1377021A - Signal receiver for receiving signals of different frequency - Google Patents

Signal receiver for receiving signals of different frequency

Info

Publication number
GB1377021A
GB1377021A GB489572A GB489572A GB1377021A GB 1377021 A GB1377021 A GB 1377021A GB 489572 A GB489572 A GB 489572A GB 489572 A GB489572 A GB 489572A GB 1377021 A GB1377021 A GB 1377021A
Authority
GB
United Kingdom
Prior art keywords
signal
transistor
filter
threshold
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
GB489572A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1377021A publication Critical patent/GB1377021A/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)
  • Noise Elimination (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB489572A 1971-02-05 1972-02-02 Signal receiver for receiving signals of different frequency Expired GB1377021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7101521A NL7101521A (de) 1971-02-05 1971-02-05

Publications (1)

Publication Number Publication Date
GB1377021A true GB1377021A (en) 1974-12-11

Family

ID=19812409

Family Applications (1)

Application Number Title Priority Date Filing Date
GB489572A Expired GB1377021A (en) 1971-02-05 1972-02-02 Signal receiver for receiving signals of different frequency

Country Status (5)

Country Link
JP (1) JPS555752B1 (de)
DE (1) DE2201609C3 (de)
FR (1) FR2124484B1 (de)
GB (1) GB1377021A (de)
NL (1) NL7101521A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113970521A (zh) * 2021-10-15 2022-01-25 中国南方电网有限责任公司超高压输电公司检修试验中心 分接开关油样的监测方法及装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE396684B (sv) * 1976-02-09 1977-09-26 Ericsson Telefon Ab L M Hallkrets i en mottagaranordning for mfc-signalering
SE397763B (sv) * 1976-03-09 1977-11-14 Ericsson Telefon Ab L M Mottagaranordning for storningskenslig detektering av atminstone tva tonfrekvenser i en inkommande tonsignal
FR2373926A1 (fr) * 1976-12-10 1978-07-07 Constr Telephoniques Recepteur de signaux multifrequences
DE3104138A1 (de) * 1981-02-06 1982-08-19 TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg Teilnehmerschaltung
DE3115151A1 (de) * 1981-04-15 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur auswertung von aus mehreren gleichzeitig uebertragenen wechselstroemen unterschiedlicher signalfrequenzen gebildeten wechselstromsignalen, in fernmeldeanlagen
JP6426812B1 (ja) 2017-08-01 2018-11-21 株式会社多磨バイオ 医療用シート

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113970521A (zh) * 2021-10-15 2022-01-25 中国南方电网有限责任公司超高压输电公司检修试验中心 分接开关油样的监测方法及装置
CN113970521B (zh) * 2021-10-15 2023-09-26 中国南方电网有限责任公司超高压输电公司检修试验中心 分接开关油样的监测方法及装置

Also Published As

Publication number Publication date
FR2124484B1 (de) 1977-04-01
NL7101521A (de) 1972-08-08
DE2201609A1 (de) 1972-08-10
JPS555752B1 (de) 1980-02-08
FR2124484A1 (de) 1972-09-22
DE2201609B2 (de) 1978-06-29
DE2201609C3 (de) 1979-03-22

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee