GB1427407A - Multi-frequency code signal receivers for use in telecommunicati ons systems - Google Patents

Multi-frequency code signal receivers for use in telecommunicati ons systems

Info

Publication number
GB1427407A
GB1427407A GB3421773A GB3421773A GB1427407A GB 1427407 A GB1427407 A GB 1427407A GB 3421773 A GB3421773 A GB 3421773A GB 3421773 A GB3421773 A GB 3421773A GB 1427407 A GB1427407 A GB 1427407A
Authority
GB
United Kingdom
Prior art keywords
signals
pair
filters
terminal
receiver
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
GB3421773A
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.)
Siemens Corp
Original Assignee
Siemens 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 Siemens Corp filed Critical Siemens Corp
Publication of GB1427407A publication Critical patent/GB1427407A/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
    • H04Q1/457—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (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)
GB3421773A 1972-07-26 1973-07-18 Multi-frequency code signal receivers for use in telecommunicati ons systems Expired GB1427407A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2236781A DE2236781C2 (de) 1972-07-26 1972-07-26 Schaltungsanordnung für Mehrfrequenzen-Codezeichenempfänger in Fernmelde-, insbesondere Fernsprechanlagen mit zusätzlichem Datenverkehr

Publications (1)

Publication Number Publication Date
GB1427407A true GB1427407A (en) 1976-03-10

Family

ID=5851808

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3421773A Expired GB1427407A (en) 1972-07-26 1973-07-18 Multi-frequency code signal receivers for use in telecommunicati ons systems

Country Status (12)

Country Link
US (1) US3914558A (enExample)
JP (1) JPS4953702A (enExample)
AT (1) AT326732B (enExample)
BE (1) BE802836A (enExample)
CH (1) CH558115A (enExample)
DE (1) DE2236781C2 (enExample)
FR (1) FR2194092B1 (enExample)
GB (1) GB1427407A (enExample)
IT (1) IT992675B (enExample)
LU (1) LU68083A1 (enExample)
NL (1) NL7309814A (enExample)
SE (1) SE385179B (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2534636A1 (de) * 1975-08-02 1977-02-17 Telefonbau & Normalzeit Gmbh Schaltungsanordnung zum senden von anschaltinformationen, insbesondere in nebenstellenanlagen
JPS54120503A (en) * 1978-03-11 1979-09-19 Nippon Telegr & Teleph Corp <Ntt> Coding system for push-button dial signal
FR2759224B1 (fr) * 1997-02-06 1999-04-30 Info Telecom Procedes de transmission et de decodage acoustiques d'un message numerique et dispositifs correspondants

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3288940A (en) * 1963-10-24 1966-11-29 Automatic Elect Lab Multifrequency signal receiver
US3582562A (en) * 1969-05-07 1971-06-01 Itt Key telephone intercommunication system

Also Published As

Publication number Publication date
SE385179B (sv) 1976-06-08
AT326732B (de) 1975-12-29
NL7309814A (enExample) 1974-01-29
FR2194092B1 (enExample) 1976-11-12
DE2236781C2 (de) 1974-06-12
IT992675B (it) 1975-09-30
US3914558A (en) 1975-10-21
DE2236781A1 (enExample) 1973-11-08
JPS4953702A (enExample) 1974-05-24
LU68083A1 (enExample) 1974-03-07
BE802836A (fr) 1974-01-28
ATA438073A (de) 1975-03-15
DE2236781B1 (de) 1973-11-08
FR2194092A1 (enExample) 1974-02-22
CH558115A (de) 1975-01-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee