DK129017B - Apparat til tilvejebringelse af lydsvingninger. - Google Patents

Apparat til tilvejebringelse af lydsvingninger.

Info

Publication number
DK129017B
DK129017B DK569071AA DK569071A DK129017B DK 129017 B DK129017 B DK 129017B DK 569071A A DK569071A A DK 569071AA DK 569071 A DK569071 A DK 569071A DK 129017 B DK129017 B DK 129017B
Authority
DK
Denmark
Prior art keywords
providing sound
sound oscillations
oscillations
providing
sound
Prior art date
Application number
DK569071AA
Other languages
English (en)
Inventor
Der Plaats P Van
Zuuren E Van
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
Publication of DK129017B publication Critical patent/DK129017B/da

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
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
DK569071AA 1970-11-24 1971-11-19 Apparat til tilvejebringelse af lydsvingninger. DK129017B (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7017136A NL7017136A (da) 1970-11-24 1970-11-24

Publications (1)

Publication Number Publication Date
DK129017B true DK129017B (da) 1974-08-05

Family

ID=19811633

Family Applications (1)

Application Number Title Priority Date Filing Date
DK569071AA DK129017B (da) 1970-11-24 1971-11-19 Apparat til tilvejebringelse af lydsvingninger.

Country Status (10)

Country Link
US (1) US3864532A (da)
AU (1) AU462020B2 (da)
BE (1) BE775780A (da)
CA (1) CA953042A (da)
DE (1) DE2154315B2 (da)
DK (1) DK129017B (da)
FR (1) FR2115332B1 (da)
GB (1) GB1367157A (da)
NL (1) NL7017136A (da)
SE (1) SE372679B (da)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652320B2 (da) * 1974-04-10 1981-12-11
DE2647439C2 (de) * 1976-10-21 1982-10-21 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Schallsignalgeber, insbesondere für Kraftfahrzeuge
US4163873A (en) * 1977-08-09 1979-08-07 Telephonic Equipment Corporation Telephone solid state ringer
US4251694A (en) * 1979-08-16 1981-02-17 Western Electric Company, Inc. Tone-ringing circuits and methods for telephone sets
US4728933A (en) * 1986-03-24 1988-03-01 U.S. Holding Company, Inc. Miniature dual cavity ringer
JP2701279B2 (ja) * 1987-12-28 1998-01-21 ヤマハ株式会社 音響装置
JP2605321B2 (ja) * 1987-12-28 1997-04-30 ヤマハ株式会社 音響装置
US5218634A (en) * 1990-05-29 1993-06-08 American Phone Products, Inc. Ringer assembly
US6748060B2 (en) 2002-04-08 2004-06-08 Plantronics, Inc. Apparatus and method for providing voice telephone instructions
JP2013026911A (ja) * 2011-07-22 2013-02-04 Nec Access Technica Ltd 電圧生成装置および電圧生成方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2759179A (en) * 1952-12-05 1956-08-14 Bell Telephone Labor Inc Ringing circuit
BE637296A (da) * 1962-09-17
GB1039668A (en) * 1964-07-28 1966-08-17 Ass Elect Ind Improvements relating to telephone system substation circuits
GB1086702A (en) * 1964-10-15 1967-10-11 Post Office Electrical calling circuits
GB1128053A (en) * 1965-07-26 1968-09-25 Standard Telephones Cables Ltd Acoustic signalling means particularly for telephone sets

Also Published As

Publication number Publication date
NL7017136A (da) 1972-05-26
BE775780A (fr) 1972-05-24
AU3598571A (en) 1973-05-31
SE372679B (da) 1974-12-23
US3864532A (en) 1975-02-04
CA953042A (en) 1974-08-13
GB1367157A (en) 1974-09-18
FR2115332A1 (da) 1972-07-07
DE2154315B2 (de) 1976-05-20
AU462020B2 (en) 1975-05-27
FR2115332B1 (da) 1977-01-21
DE2154315A1 (de) 1972-05-25

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Legal Events

Date Code Title Description
PBP Patent lapsed