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GB915478A - Improvements relating to electromagnetic tone sounders for giving audible calling signals - Google Patents

Improvements relating to electromagnetic tone sounders for giving audible calling signals

Info

Publication number
GB915478A
GB915478A GB3550360A GB3550360A GB915478A GB 915478 A GB915478 A GB 915478A GB 3550360 A GB3550360 A GB 3550360A GB 3550360 A GB3550360 A GB 3550360A GB 915478 A GB915478 A GB 915478A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
resonator
tuned
transducer
sounders
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
GB3550360A
Inventor
Peter John Lane
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB3550360A priority Critical patent/GB915478A/en
Publication of GB915478A publication Critical patent/GB915478A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

915,478. Diaphragm vibrators; resonators. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Sept. 20, 1961 [Oct. 17, 1960], No. 35503/60. Class 13. An electromagnetic tone producer, intended particularly for use as a calling device in a telephone set, comprises an electro-acoustic transducer 2 having a diaphragm 7 which, being vibratable in response to the application of tone current to an electromagnet 11 of the transducer, is acoustically coupled to the external air through a tuned acoustic resonator 3 acoustically open at one end towards the diaphragm 7 and tuned to resonate in response to vibration thereof, the resonator 3 being tuned in the manner of a Helmholtz resonator by a transversely-extending apertured part 13 provided at its other end and having at least one aperture 14 through which that other end of the resonator is acoustically open towards the external air. As shown, the transducer is of the balanced-armature ring-magnet type. There may be two resonators, one on each side of the diaphragm.
GB3550360A 1960-10-17 1960-10-17 Improvements relating to electromagnetic tone sounders for giving audible calling signals Expired GB915478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3550360A GB915478A (en) 1960-10-17 1960-10-17 Improvements relating to electromagnetic tone sounders for giving audible calling signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3550360A GB915478A (en) 1960-10-17 1960-10-17 Improvements relating to electromagnetic tone sounders for giving audible calling signals

Publications (1)

Publication Number Publication Date
GB915478A true GB915478A (en) 1963-01-16

Family

ID=10378483

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3550360A Expired GB915478A (en) 1960-10-17 1960-10-17 Improvements relating to electromagnetic tone sounders for giving audible calling signals

Country Status (1)

Country Link
GB (1) GB915478A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241334A (en) * 1979-01-29 1980-12-23 Ibuki Kogyo Co., Ltd. Electric horn with twin driving electromagnets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241334A (en) * 1979-01-29 1980-12-23 Ibuki Kogyo Co., Ltd. Electric horn with twin driving electromagnets

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