GB1465534A - Telephone systems - Google Patents

Telephone systems

Info

Publication number
GB1465534A
GB1465534A GB2048074A GB2048074A GB1465534A GB 1465534 A GB1465534 A GB 1465534A GB 2048074 A GB2048074 A GB 2048074A GB 2048074 A GB2048074 A GB 2048074A GB 1465534 A GB1465534 A GB 1465534A
Authority
GB
United Kingdom
Prior art keywords
amplifiers
signal
threshold
amplifier
signals
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
GB2048074A
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.)
Microsemi Semiconductor ULC
Original Assignee
Mitel 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 Mitel Corp filed Critical Mitel Corp
Publication of GB1465534A publication Critical patent/GB1465534A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB2048074A 1973-06-26 1974-05-09 Telephone systems Expired GB1465534A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA174,906A CA998484A (en) 1973-06-26 1973-06-26 Audio frequency signalling systems for telephone systems

Publications (1)

Publication Number Publication Date
GB1465534A true GB1465534A (en) 1977-02-23

Family

ID=4097099

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2048074A Expired GB1465534A (en) 1973-06-26 1974-05-09 Telephone systems

Country Status (6)

Country Link
US (1) US3894197A (enExample)
JP (1) JPS5054206A (enExample)
CA (1) CA998484A (enExample)
DE (1) DE2430713A1 (enExample)
FR (1) FR2235557B3 (enExample)
GB (1) GB1465534A (enExample)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185173A (en) * 1976-10-01 1980-01-22 Nippon Tsu Shin Kogyo K.K. Key telephone call signalling circuit
US4219699A (en) * 1978-10-13 1980-08-26 Wescom, Inc. Telephone supervision system using DTMF signals
US4313038A (en) * 1978-10-13 1982-01-26 Wescom, Inc. DTMF Signal receiver
US4262171A (en) * 1979-01-08 1981-04-14 Catalyst Research Corporation Telephone system in which communication between stations is controlled by computers at each individual station
CA1169597A (en) * 1981-09-11 1984-06-19 Gordon D. Benning Home communications and control system
FR2524743A1 (fr) * 1982-04-01 1983-10-07 Wadel Alain Systeme d'alerte entre un centre de secours et des abonnes telephoniques a travers des lignes telephoniques
US4650489A (en) * 1986-01-30 1987-03-17 Massachusetts Institute Of Technology Prosthetic device for implantation in bone
DE3606516C1 (de) * 1986-02-28 1987-06-19 Telefonbau & Normalzeit Gmbh Schaltungsanordnung fuer Freisprech- und Lauthoereinrichtungen bei Fernsprechapparaten

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459895A (en) * 1966-05-19 1969-08-05 Itt Centrally powered subscriber carrier systems
US3601538A (en) * 1969-02-24 1971-08-24 Stromberg Carlson Corp Carrier and voice-frequency telephone system
US3781481A (en) * 1971-09-30 1973-12-25 Stromberg Carlson Corp Amplifier select and control circuit
CA968477A (en) * 1972-07-24 1975-05-27 Microsystems International Limited Threshold circuit for tone-ringer or like load means

Also Published As

Publication number Publication date
CA998484A (en) 1976-10-12
US3894197A (en) 1975-07-08
DE2430713A1 (de) 1975-01-23
FR2235557A1 (enExample) 1975-01-24
FR2235557B3 (enExample) 1977-04-15
JPS5054206A (enExample) 1975-05-13

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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