BE736262A - - Google Patents

Info

Publication number
BE736262A
BE736262A BE736262DA BE736262A BE 736262 A BE736262 A BE 736262A BE 736262D A BE736262D A BE 736262DA BE 736262 A BE736262 A BE 736262A
Authority
BE
Belgium
Application number
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
Publication of BE736262A publication Critical patent/BE736262A/xx

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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Complex Calculations (AREA)
  • Interface Circuits In Exchanges (AREA)
BE736262D 1968-07-30 1969-07-18 BE736262A (un)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR161172 1968-07-30

Publications (1)

Publication Number Publication Date
BE736262A true BE736262A (un) 1970-01-19

Family

ID=8653211

Family Applications (1)

Application Number Title Priority Date Filing Date
BE736262D BE736262A (un) 1968-07-30 1969-07-18

Country Status (8)

Country Link
US (1) US3683162A (un)
BE (1) BE736262A (un)
CH (1) CH504823A (un)
DE (1) DE1938804C3 (un)
FR (1) FR1603175A (un)
GB (1) GB1271528A (un)
NL (1) NL6911559A (un)
SE (1) SE344527B (un)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2116224B1 (un) * 1970-10-29 1974-10-31 Ibm France
FR2164544B1 (un) * 1971-12-21 1974-09-27 Ibm France
US3732409A (en) * 1972-03-20 1973-05-08 Nasa Counting digital filters
FR2295665A1 (fr) * 1974-12-18 1976-07-16 Labo Cent Telecommunicat Recepteur numerique de signaux multifrequences
JPS5827546B2 (ja) * 1975-04-22 1983-06-10 日本電気株式会社 エンザンソウチ
DE2659512B1 (de) * 1976-12-30 1978-05-24 Wandel & Goltermann Verfahren und Schaltungsanordnung zum Erzeugen eines Digitalsignals zum Pruefen einer PCM-Endstelle
CA1111531A (en) * 1979-02-22 1981-10-27 Jackylene K. Hood Digital signalling receiver for receiving pcm tones
US4203008A (en) * 1979-02-26 1980-05-13 Northern Telecom Limited Digital signalling receiver for receiving PCM tones
US4354248A (en) * 1979-11-28 1982-10-12 Motorola, Inc. Programmable multifrequency tone receiver
FR2485843B1 (fr) * 1980-06-25 1986-11-07 Cit Alcatel Recepteur numerique de frequences
FR2512306A1 (fr) * 1981-08-27 1983-03-04 Telecommunications Sa Dispositif numerique de reconnaissance de frequences
US6140568A (en) * 1997-11-06 2000-10-31 Innovative Music Systems, Inc. System and method for automatically detecting a set of fundamental frequencies simultaneously present in an audio signal
EP3744057A4 (en) * 2018-01-26 2021-10-06 California Institute of Technology ZERO DATA MODULATION COMMUNICATION SYSTEMS AND METHODS
KR20210139244A (ko) 2019-02-07 2021-11-22 캘리포니아 인스티튜트 오브 테크놀로지 채널 장애들의 존재시 제로들에 대해 데이터를 변조하여 통신하는 시스템들 및 방법들

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099742A (en) * 1959-03-13 1963-07-30 Westinghouse Air Brake Co Digital flow computer employing a logarithmic mode of computation
US3288940A (en) * 1963-10-24 1966-11-29 Automatic Elect Lab Multifrequency signal receiver
US3404231A (en) * 1965-01-05 1968-10-01 Bell Telephone Labor Inc Framing of pulse code transmission systems by use of an added tone signal
US3521041A (en) * 1967-07-19 1970-07-21 Ibm Digital filters

Also Published As

Publication number Publication date
DE1938804A1 (de) 1970-02-05
FR1603175A (un) 1971-03-22
NL6911559A (un) 1970-02-03
CH504823A (fr) 1971-03-15
US3683162A (en) 1972-08-08
SE344527B (un) 1972-04-17
DE1938804C3 (de) 1980-02-21
GB1271528A (en) 1972-04-19
DE1938804B2 (de) 1979-05-23

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Legal Events

Date Code Title Description
RE20 Patent expired

Owner name: CIT CIE IND. DES TELECOMMUNICATIONS & SOC. LANNI

Effective date: 19890718