EP0087908A1 - Elektroakustische Signalgeber - Google Patents

Elektroakustische Signalgeber Download PDF

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Publication number
EP0087908A1
EP0087908A1 EP83300910A EP83300910A EP0087908A1 EP 0087908 A1 EP0087908 A1 EP 0087908A1 EP 83300910 A EP83300910 A EP 83300910A EP 83300910 A EP83300910 A EP 83300910A EP 0087908 A1 EP0087908 A1 EP 0087908A1
Authority
EP
European Patent Office
Prior art keywords
electro
planar member
planar
calling device
acoustic
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.)
Granted
Application number
EP83300910A
Other languages
English (en)
French (fr)
Other versions
EP0087908B1 (de
Inventor
Keith John Vickers
Allan George Carr
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.)
Cessione gec Plessey Telecomunications Ltd
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to AT83300910T priority Critical patent/ATE16879T1/de
Publication of EP0087908A1 publication Critical patent/EP0087908A1/de
Application granted granted Critical
Publication of EP0087908B1 publication Critical patent/EP0087908B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 

Definitions

  • the present invention relates to electro-acoustic calling devices and is more particularly although not exclusively concerned with such devices for use in telephone instruments.
  • One such electro-acoustic tone calling device comprises a flat metal disc clasped at its edges and having an electrically responsive (piezzo) crystal attached thereto.
  • an electric current passes through the crystal in one direction the crystal tends to exert pressure on the metal plate in one direction.
  • current passes through the crystal in the opposed direction the pressure exerted on the metal plate is in the opposed direction.
  • Controlling the volume of the output of such calling devices may involve electrical circuits which are costly to manufacture.
  • an electro-acoustic calling device of the kind comprising an electro-acoustic transducer responsive to electrical signals applied to inputs thereof to provide an audible signal, and a housing which surrounds said transducer said housing having a planar member including at least one aperture through which sound waves may pass substantially unimpeded, said housing has a second planar member which is moveable with respect to the first planar member and which includes at least one aperture, said second planar member being positioned such that movement of the planar members with respect to each other causes a variation in the unimpeded path of sound waves so as to provide variable attenuation of the output of the transducer and said apertures are of a size and positioned such that there is a logarithmic relationship between the attenuation of the output and the position of the planar members with respect to each other so that there is an apparent linear relationship between the distance through which one of the members is moved and the change in sound intensity of the device as heard by a human ear.
  • said second planar member is rotatably attached to the first planar member and is positioned such that at least a part of the second planar member extends beyond an edge of the first planar member to facilitate manual rotation thereof.
  • Said first planar member may be integral with the housing.
  • the planar members may be disc shaped members of plastics material, one of said members including a single aperture and the other planar member including a plurality of apertures which are substantially smaller than said single aperture.
  • a spigot and channel arrangement may be provided to limit movement of the planar members within minimum and maximum volume levels of the calling device.
  • the calling device comprises a disc shaped aluminium plate 1 to which a ceramic disc 2 is bonded and electrical contact springs 3 and 4.
  • the ceramic disc 2 is of the kind previously referred to.
  • the plate 1 is fitted to a front housing member 5 and is clamped in position by a rear housing member 6.
  • the plastics material from which the housing is made being semi-rigid co-operation of respective moulded interlocking joints 9 and 10 of the housing members 5 and 6 locks the two parts of the housing together.
  • the front housing member 5 has an aperture 7 centrally located therein.
  • sound waves characterised by variations in air pressure in the cavity 8 would, if the aperture 7 was unobstructed, pass freely to the surrounding atmosphere by way of the aperture ?.
  • a disc member 11 also of plastics material is provided.
  • the disc member 11 is rotatable about a split spigot 12 moulded integrally with the front housing member 5.
  • the spigot 12 passes through a centrally located circular aperture 13 in the disc member 11 and holds the disc member 11 to the housing member 5 with four overlapping locking sections.
  • the flexibility of the material of the housing member 5 is again used so that the disc member 11 is forced over the spigot 12, the locking sections then springing over the edges of the aperture 13.
  • the spigot 12 is moulded with chamfered edges.
  • the disc member 11 is provided with a number of carefully positioned apertures 14 each of which is the same size and very much smaller than the aperture 7. As the disc member 11 is rotated about the spigot 12 varying number of the apertures 14 and parts of them permit free transfer of sound waves from the cavity 8. Thus in one extreme there may be none of the apertures 14 aligned with the aperture 7 whilst at the other extreme all twenty-four of the apertures 14 will be aligned. These two extremes represent the minimum and maximum volume positions of the calling device.
  • each of the apertures is extremely important. Volume of sound as detected by a human ear is not a linear function. In electrical volume controls a logarithmic variable resistance is used. Since the present invention aims to reduce the cost of calling devices provision of an electric volume control would be an undesirable expense.
  • the apertures 14 are positioned such that rotation of the disc member 11 from the minimum to the maximum positions causes a logerithmically increasing exposure of the aperture ? and vice-versa.
  • an acoustic seal 15 of, for example, polythene is provided.
  • the seal 15 is a push fit to the housing member 5 and contacts the underside of the disc member 11.
  • the disc member 11 has a cutaway channel 16 formed in its underside which channel 16 cooperates with a spigot 17 of the front housing member 5 to prevent the disc member 11 being turned beyond the maximum and minimum volume levels.
  • the edge thereof may be knurled or formed with a knurled edge.
  • a separate volume control operating member is not required when the calling device is suitably located for example in a telephone instrument, with part of the disc member 11 passing through a suitable aperture in the telephone instrument casing (not shown).
  • Figure 7 shows a co-ordinate chart giving respective X and Y coordinate location for one particular set of the apertures 14. It will be appreciated that other implementations of the set of apertures 14 may be used provided that the logarithmic exposure relationship is maintained.

Landscapes

  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephone Set Structure (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Headphones And Earphones (AREA)
EP83300910A 1982-02-26 1983-02-22 Elektroakustische Signalgeber Expired EP0087908B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83300910T ATE16879T1 (de) 1982-02-26 1983-02-22 Elektroakustische signalgeber.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8205748 1982-02-26
GB8205748 1982-02-26

Publications (2)

Publication Number Publication Date
EP0087908A1 true EP0087908A1 (de) 1983-09-07
EP0087908B1 EP0087908B1 (de) 1985-12-04

Family

ID=10528646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83300910A Expired EP0087908B1 (de) 1982-02-26 1983-02-22 Elektroakustische Signalgeber

Country Status (15)

Country Link
EP (1) EP0087908B1 (de)
JP (1) JPS58159099A (de)
AT (1) ATE16879T1 (de)
AU (1) AU549945B2 (de)
CA (1) CA1215163A (de)
DE (1) DE3361370D1 (de)
DK (1) DK78383A (de)
GB (1) GB2115648B (de)
HK (1) HK79485A (de)
IL (1) IL67935A (de)
KE (1) KE3554A (de)
MY (1) MY8600266A (de)
NZ (1) NZ203265A (de)
ZA (1) ZA831054B (de)
ZW (1) ZW5283A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188017A1 (de) * 1984-12-19 1986-07-23 Philips Electronics Uk Limited Elektroakustisches Warngerät
EP0688142A3 (de) * 1994-06-16 1996-11-20 Akg Akustische Kino Geraete Akustischer Widerstand, insbesondere für elektroakustische Wandler
US6124992A (en) * 1995-02-08 2000-09-26 Seagate Technology Llc System and method for reconstructing a signal wave in a partial response read channel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1884724A (en) * 1923-06-19 1932-10-25 Western Electric Co Sound box for phonic diaphragms
US3826333A (en) * 1973-03-21 1974-07-30 J Buckwalter Baffle for a sound producing device
FR2273335A1 (de) * 1974-05-31 1975-12-26 Klaxon Sa
GB2082018A (en) * 1980-07-31 1982-02-24 Standard Telephones Cables Ltd Telephone sounder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1884724A (en) * 1923-06-19 1932-10-25 Western Electric Co Sound box for phonic diaphragms
US3826333A (en) * 1973-03-21 1974-07-30 J Buckwalter Baffle for a sound producing device
FR2273335A1 (de) * 1974-05-31 1975-12-26 Klaxon Sa
GB2082018A (en) * 1980-07-31 1982-02-24 Standard Telephones Cables Ltd Telephone sounder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188017A1 (de) * 1984-12-19 1986-07-23 Philips Electronics Uk Limited Elektroakustisches Warngerät
EP0688142A3 (de) * 1994-06-16 1996-11-20 Akg Akustische Kino Geraete Akustischer Widerstand, insbesondere für elektroakustische Wandler
US6124992A (en) * 1995-02-08 2000-09-26 Seagate Technology Llc System and method for reconstructing a signal wave in a partial response read channel

Also Published As

Publication number Publication date
ZA831054B (en) 1984-03-28
GB8305038D0 (en) 1983-03-30
JPS58159099A (ja) 1983-09-21
IL67935A0 (en) 1983-06-15
MY8600266A (en) 1986-12-31
HK79485A (en) 1985-10-25
GB2115648A (en) 1983-09-07
NZ203265A (en) 1985-04-30
IL67935A (en) 1986-04-29
GB2115648B (en) 1985-03-13
CA1215163A (en) 1986-12-09
AU1149283A (en) 1983-09-01
ZW5283A1 (en) 1983-05-11
DE3361370D1 (en) 1986-01-16
KE3554A (en) 1985-08-30
DK78383D0 (da) 1983-02-22
DK78383A (da) 1983-08-27
AU549945B2 (en) 1986-02-20
EP0087908B1 (de) 1985-12-04
ATE16879T1 (de) 1985-12-15

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