ES426575A1 - Perfeccionamientos introducidos en un circuito de adapta- cion de linea para uso en un aparato telefonico de abonado con marcacion de numero por pulsadores de tono. - Google Patents

Perfeccionamientos introducidos en un circuito de adapta- cion de linea para uso en un aparato telefonico de abonado con marcacion de numero por pulsadores de tono.

Info

Publication number
ES426575A1
ES426575A1 ES426575A ES426575A ES426575A1 ES 426575 A1 ES426575 A1 ES 426575A1 ES 426575 A ES426575 A ES 426575A ES 426575 A ES426575 A ES 426575A ES 426575 A1 ES426575 A1 ES 426575A1
Authority
ES
Spain
Prior art keywords
tone
matching circuit
pushbutton
set provided
line matching
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
ES426575A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken 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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES426575A1 publication Critical patent/ES426575A1/es
Expired legal-status Critical Current

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)
ES426575A 1973-05-25 1974-05-22 Perfeccionamientos introducidos en un circuito de adapta- cion de linea para uso en un aparato telefonico de abonado con marcacion de numero por pulsadores de tono. Expired ES426575A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7307296A NL7307296A (es) 1973-05-25 1973-05-25

Publications (1)

Publication Number Publication Date
ES426575A1 true ES426575A1 (es) 1976-09-01

Family

ID=19818945

Family Applications (1)

Application Number Title Priority Date Filing Date
ES426575A Expired ES426575A1 (es) 1973-05-25 1974-05-22 Perfeccionamientos introducidos en un circuito de adapta- cion de linea para uso en un aparato telefonico de abonado con marcacion de numero por pulsadores de tono.

Country Status (11)

Country Link
US (1) US3982078A (es)
JP (1) JPS5022507A (es)
BE (1) BE815522A (es)
CA (1) CA997079A (es)
DE (1) DE2424335A1 (es)
DK (1) DK280374A (es)
ES (1) ES426575A1 (es)
FR (1) FR2231167A1 (es)
GB (1) GB1438263A (es)
IT (1) IT1012756B (es)
NL (1) NL7307296A (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2034555B (en) * 1978-11-08 1983-03-02 Standard Telephones Cables Ltd Bridge amplifier
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
FR2231167A1 (es) 1974-12-20
GB1438263A (en) 1976-06-03
US3982078A (en) 1976-09-21
CA997079A (en) 1976-09-14
DE2424335A1 (de) 1974-12-19
IT1012756B (it) 1977-03-10
JPS5022507A (es) 1975-03-11
DK280374A (es) 1975-01-20
NL7307296A (es) 1974-11-27
USB472284I5 (es) 1976-01-13
BE815522A (fr) 1974-11-25

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