FR2015707A1 - - Google Patents

Info

Publication number
FR2015707A1
FR2015707A1 FR6927556A FR6927556A FR2015707A1 FR 2015707 A1 FR2015707 A1 FR 2015707A1 FR 6927556 A FR6927556 A FR 6927556A FR 6927556 A FR6927556 A FR 6927556A FR 2015707 A1 FR2015707 A1 FR 2015707A1
Authority
FR
France
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.)
Withdrawn
Application number
FR6927556A
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 FR2015707A1 publication Critical patent/FR2015707A1/fr
Withdrawn legal-status Critical Current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
    • H04Q1/4535—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 with an additional signal transmitted for voice protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Amplifiers (AREA)
FR6927556A 1968-08-15 1969-08-11 Withdrawn FR2015707A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3900568 1968-08-15

Publications (1)

Publication Number Publication Date
FR2015707A1 true FR2015707A1 (fr) 1970-04-30

Family

ID=10407027

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6927556A Withdrawn FR2015707A1 (fr) 1968-08-15 1969-08-11

Country Status (9)

Country Link
US (1) US3649771A (fr)
JP (1) JPS4811481B1 (fr)
BE (1) BE737475A (fr)
CH (1) CH518662A (fr)
DE (1) DE1940558C3 (fr)
ES (1) ES370482A1 (fr)
FR (1) FR2015707A1 (fr)
GB (1) GB1226368A (fr)
NL (1) NL6912434A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2141502B1 (fr) * 1971-06-01 1973-06-29 Ibm France
DE2548104C2 (de) * 1975-10-28 1982-05-19 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Sprachgesicherte Tonruf-Auswerte- Schaltung
DE3710695A1 (de) * 1987-03-31 1988-10-20 Nixdorf Computer Ag Schaltungsanordnung zum erkennen von doppelton-mehrfrequenzsignalen in fernsprechanlagen
KR100758206B1 (ko) * 2006-09-14 2007-09-12 주식회사 쏠리테크 반향성분 제거 시스템 및 반향성분 제거방법

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319011A (en) * 1964-05-11 1967-05-09 Bell Telephone Labor Inc Multifrequency signal receiver circuit

Also Published As

Publication number Publication date
CH518662A (de) 1972-01-31
DE1940558C3 (de) 1973-11-22
NL6912434A (fr) 1970-02-17
DE1940558A1 (de) 1970-02-19
DE1940558B2 (de) 1973-05-03
US3649771A (en) 1972-03-14
GB1226368A (fr) 1971-03-24
JPS4811481B1 (fr) 1973-04-13
ES370482A1 (es) 1971-04-16
BE737475A (fr) 1970-02-16

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Legal Events

Date Code Title Description
ST Notification of lapse