IT1012756B - Circuito di adattamento di linea per l impiego in un apparato te lefonico di abbonato con selezio ne a pulsanti dotato di un gene ratore di tono - Google Patents

Circuito di adattamento di linea per l impiego in un apparato te lefonico di abbonato con selezio ne a pulsanti dotato di un gene ratore di tono

Info

Publication number
IT1012756B
IT1012756B IT23105/74A IT2310574A IT1012756B IT 1012756 B IT1012756 B IT 1012756B IT 23105/74 A IT23105/74 A IT 23105/74A IT 2310574 A IT2310574 A IT 2310574A IT 1012756 B IT1012756 B IT 1012756B
Authority
IT
Italy
Prior art keywords
tone
telephone device
subscriber telephone
button selection
adaptation circuit
Prior art date
Application number
IT23105/74A
Other languages
English (en)
Italian (it)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of IT1012756B publication Critical patent/IT1012756B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
IT23105/74A 1973-05-25 1974-05-22 Circuito di adattamento di linea per l impiego in un apparato te lefonico di abbonato con selezio ne a pulsanti dotato di un gene ratore di tono IT1012756B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7307296A NL7307296A (cg-RX-API-DMAC7.html) 1973-05-25 1973-05-25

Publications (1)

Publication Number Publication Date
IT1012756B true IT1012756B (it) 1977-03-10

Family

ID=19818945

Family Applications (1)

Application Number Title Priority Date Filing Date
IT23105/74A IT1012756B (it) 1973-05-25 1974-05-22 Circuito di adattamento di linea per l impiego in un apparato te lefonico di abbonato con selezio ne a pulsanti dotato di un gene ratore di tono

Country Status (11)

Country Link
US (1) US3982078A (cg-RX-API-DMAC7.html)
JP (1) JPS5022507A (cg-RX-API-DMAC7.html)
BE (1) BE815522A (cg-RX-API-DMAC7.html)
CA (1) CA997079A (cg-RX-API-DMAC7.html)
DE (1) DE2424335A1 (cg-RX-API-DMAC7.html)
DK (1) DK280374A (cg-RX-API-DMAC7.html)
ES (1) ES426575A1 (cg-RX-API-DMAC7.html)
FR (1) FR2231167A1 (cg-RX-API-DMAC7.html)
GB (1) GB1438263A (cg-RX-API-DMAC7.html)
IT (1) IT1012756B (cg-RX-API-DMAC7.html)
NL (1) NL7307296A (cg-RX-API-DMAC7.html)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU518350B2 (en) * 1978-11-08 1981-09-24 International Standard Electric Corp. Bidirectional amplifier
DE2947283B1 (de) 1979-11-20 1981-06-11 Krone Gmbh, 1000 Berlin Verlustfreie automatische Verpolungsschutzvorrichtung
JPS5973510A (ja) * 1982-10-19 1984-04-25 Pola Chem Ind Inc 化粧料
US5172410A (en) * 1990-04-26 1992-12-15 Sound Control Technologies, Inc. Conference telephone system and method
JPH0561237A (ja) * 1991-05-30 1993-03-12 Fuji Xerox Co Ltd マイクロカプセルおよびその製造方法
JPH05142847A (ja) * 1991-11-15 1993-06-11 Fuji Xerox Co Ltd マイクロカプセルおよびマイクロカプセルトナー並びにそ の製造法
JP2800558B2 (ja) * 1992-04-22 1998-09-21 富士ゼロックス株式会社 静電荷像現像用マイクロカプセルトナーおよびマイクロカプセルの形成法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA915763A (en) * 1971-05-28 1972-11-28 C. J. Cowpland Michael Impedance matching circuit for driving a tone ringer or the like
BE792329A (fr) * 1971-12-09 1973-06-06 Int Standard Electric Corp Circuit de transmission electronique pour poste telephonique

Also Published As

Publication number Publication date
ES426575A1 (es) 1976-09-01
JPS5022507A (cg-RX-API-DMAC7.html) 1975-03-11
US3982078A (en) 1976-09-21
DK280374A (cg-RX-API-DMAC7.html) 1975-01-20
USB472284I5 (cg-RX-API-DMAC7.html) 1976-01-13
FR2231167A1 (cg-RX-API-DMAC7.html) 1974-12-20
GB1438263A (en) 1976-06-03
NL7307296A (cg-RX-API-DMAC7.html) 1974-11-27
BE815522A (fr) 1974-11-25
DE2424335A1 (de) 1974-12-19
CA997079A (en) 1976-09-14

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