ES424076A2 - Un receptor de multifrecuencia. - Google Patents

Un receptor de multifrecuencia.

Info

Publication number
ES424076A2
ES424076A2 ES424076A ES424076A ES424076A2 ES 424076 A2 ES424076 A2 ES 424076A2 ES 424076 A ES424076 A ES 424076A ES 424076 A ES424076 A ES 424076A ES 424076 A2 ES424076 A2 ES 424076A2
Authority
ES
Spain
Prior art keywords
signals
frequency
output
group
receive digital
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
ES424076A
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES424076A2 publication Critical patent/ES424076A2/es
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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
ES424076A 1973-03-09 1974-03-08 Un receptor de multifrecuencia. Expired ES424076A2 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00339562A US3845249A (en) 1973-03-09 1973-03-09 Multi-frequency receiver

Publications (1)

Publication Number Publication Date
ES424076A2 true ES424076A2 (es) 1976-11-16

Family

ID=23329609

Family Applications (1)

Application Number Title Priority Date Filing Date
ES424076A Expired ES424076A2 (es) 1973-03-09 1974-03-08 Un receptor de multifrecuencia.

Country Status (3)

Country Link
US (1) US3845249A (es)
DE (1) DE2410958C2 (es)
ES (1) ES424076A2 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971899A (en) * 1975-04-18 1976-07-27 Mcintosh Alexander C Signalling device for key telephone systems
US4145576A (en) * 1977-07-15 1979-03-20 Tel-Tone Corporation DTMF and rotary dial signal receiver
JPH0757030B2 (ja) * 1988-11-08 1995-06-14 シャープ株式会社 Ｄｔｍｆレシーバ
JPH03132291A (ja) * 1989-10-18 1991-06-05 Fujitsu Ltd Ｐｂ信号検出方式

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076059A (en) * 1958-06-20 1963-01-29 Bell Telephone Labor Inc Signaling system
NL267564A (es) * 1960-08-22
US3140357A (en) * 1962-06-28 1964-07-07 Bell Telephone Labor Inc Multifrequency receiver
US3288940A (en) * 1963-10-24 1966-11-29 Automatic Elect Lab Multifrequency signal receiver
US3582565A (en) * 1969-01-13 1971-06-01 Automatic Elect Lab Tone channels for multifrequency receivers
US3710031A (en) * 1970-12-23 1973-01-09 Itt Multi frequency receiver
US3686440A (en) * 1971-03-26 1972-08-22 Sola Basic Ind Inc Telephone calling-station identification

Also Published As

Publication number Publication date
US3845249A (en) 1974-10-29
DE2410958C2 (de) 1982-08-12
AU6655274A (en) 1975-09-18
DE2410958A1 (de) 1974-09-12

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Legal Events

Date Code Title Description
FD2A Announcement of lapse in spain

Effective date: 20170705