JPS5543677B2 - - Google Patents

Info

Publication number
JPS5543677B2
JPS5543677B2 JP5405774A JP5405774A JPS5543677B2 JP S5543677 B2 JPS5543677 B2 JP S5543677B2 JP 5405774 A JP5405774 A JP 5405774A JP 5405774 A JP5405774 A JP 5405774A JP S5543677 B2 JPS5543677 B2 JP S5543677B2
Authority
JP
Japan
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
JP5405774A
Other versions
JPS50147201A (ja
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 filed Critical
Priority to JP5405774A priority Critical patent/JPS5543677B2/ja
Priority to US05/576,961 priority patent/US4004105A/en
Publication of JPS50147201A publication Critical patent/JPS50147201A/ja
Publication of JPS5543677B2 publication Critical patent/JPS5543677B2/ja
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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
JP5405774A 1974-05-15 1974-05-15 Expired JPS5543677B2 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP5405774A JPS5543677B2 (ja) 1974-05-15 1974-05-15
US05/576,961 US4004105A (en) 1974-05-15 1975-05-13 Multifrequency signal receiver for use in telephone signaling systems or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5405774A JPS5543677B2 (ja) 1974-05-15 1974-05-15

Publications (2)

Publication Number Publication Date
JPS50147201A JPS50147201A (ja) 1975-11-26
JPS5543677B2 true JPS5543677B2 (ja) 1980-11-07

Family

ID=12959973

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5405774A Expired JPS5543677B2 (ja) 1974-05-15 1974-05-15

Country Status (2)

Country Link
US (1) US4004105A (ja)
JP (1) JPS5543677B2 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5299006A (en) * 1976-02-16 1977-08-19 Toshiba Corp Exchanger
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
JP3105768B2 (ja) * 1995-08-14 2000-11-06 松下電器産業株式会社 受信回路

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4878804A (ja) * 1972-01-20 1973-10-23

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5138484B1 (ja) * 1970-07-03 1976-10-22
CA976675A (en) * 1972-10-16 1975-10-21 Microsystems International Limited Dual tone receiver
US3914557A (en) * 1973-04-11 1975-10-21 Bell Telephone Labor Inc Multifrequency tone detecting arrangement
US3851112A (en) * 1973-04-26 1974-11-26 Gte Automatic Electric Lab Inc Data detector with voice signal discrimination
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4878804A (ja) * 1972-01-20 1973-10-23

Also Published As

Publication number Publication date
US4004105A (en) 1977-01-18
JPS50147201A (ja) 1975-11-26

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