EP0087908A1 - Electro-acoustic calling devices - Google Patents
Electro-acoustic calling devices Download PDFInfo
- 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
Links
- 239000013078 crystal Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
Images
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.
Abstract
Description
- 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.
- Whilst the majority of telephone instruments currently in use particularly in the United Kingdom are equipped with bells having an electromagnetically operable striker for calling purposes some instruments are now being fitted with other tone calling devices.
- 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. When an electric current passes through the crystal in one direction the crystal tends to exert pressure on the metal plate in one direction. When current passes through the crystal in the opposed direction the pressure exerted on the metal plate is in the opposed direction.
- Thus application of an alternating current to the crystal causes the metal plate to vibrate and such acoustic calling devices may produce a considerable noise. A specific form of such a calling device is disclosed in United Kingdom Patent No. 1434056.
- Controlling the volume of the output of such calling devices may involve electrical circuits which are costly to manufacture.
- It is one object of the present invention to provide an electro-acoustic calling device the volume of whose output may be controlled without alteration of the electric signals supplied thereto.
- According to the present invention in 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.
- Preferably 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.
- An embodiment of a calling device in accordance with the invention will now be described with reference to the accompanying drawings of which:-
- Figure 1 is a plan view of the calling device
- Figure 2 is a reverse plan view of the device of Figure 1;
- Figure 3 is a cross section on the line III-III of Figure 2;
- Figure.4 shows a part of Figure 1 in greater detail;
- Figure 5 is another view of the part shown in Figure 4;
- Figure 6 shows a cross section on the line VI - VI of Figure 4; and
- Figure 7 shows the distribution of apertures of the part of Figure 4.
- Referring first to Figures 1, 2 and 3 the calling device comprises a disc shaped
aluminium plate 1 to which aceramic disc 2 is bonded andelectrical contact springs ceramic disc 2 is of the kind previously referred to. Thus if an electric current passes from thecontact spring 3 to thecontact spring 4 thedisc 2,and consequentially theplate 1, flexes in one direction whilst if an electric current passes from thecontact spring 4 to thecontact spring 3 thedisc 2 and theplate 1 flex in the opposed direction. - The
plate 1 is fitted to afront housing member 5 and is clamped in position by arear housing member 6. The plastics material from which the housing is made being semi-rigid co-operation of respectivemoulded interlocking joints housing members - The
front housing member 5 has anaperture 7 centrally located therein. Thus sound waves characterised by variations in air pressure in thecavity 8 would, if theaperture 7 was unobstructed, pass freely to the surrounding atmosphere by way of the aperture ?. In order to reduce the volume of sound passing into the atmosphere by way of the aperture 7 adisc member 11, also of plastics material is provided. Thedisc member 11 is rotatable about asplit spigot 12 moulded integrally with thefront housing member 5. Thespigot 12 passes through a centrally locatedcircular aperture 13 in thedisc member 11 and holds thedisc member 11 to thehousing member 5 with four overlapping locking sections. The flexibility of the material of thehousing member 5 is again used so that thedisc member 11 is forced over thespigot 12, the locking sections then springing over the edges of theaperture 13. To facilitate fitting of thedisc member 11, thespigot 12 is moulded with chamfered edges. - The
disc member 11 is provided with a number of carefully positionedapertures 14 each of which is the same size and very much smaller than theaperture 7. As thedisc member 11 is rotated about thespigot 12 varying number of theapertures 14 and parts of them permit free transfer of sound waves from thecavity 8. Thus in one extreme there may be none of theapertures 14 aligned with theaperture 7 whilst at the other extreme all twenty-four of theapertures 14 will be aligned. These two extremes represent the minimum and maximum volume positions of the calling device. - The location of each of the apertures, as will be explained hereinafter 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. Thus the
apertures 14 are positioned such that rotation of thedisc member 11 from the minimum to the maximum positions causes a logerithmically increasing exposure of the aperture ? and vice-versa. - To prevent an additional exposure of the
aperture 7 other than by way of theapertures 14 anacoustic seal 15 of, for example, polythene is provided. Theseal 15 is a push fit to thehousing member 5 and contacts the underside of thedisc member 11. - Referring also to Figure 4, 5 and 6 the
disc member 11 has acutaway channel 16 formed in its underside whichchannel 16 cooperates with aspigot 17 of thefront housing member 5 to prevent thedisc member 11 being turned beyond the maximum and minimum volume levels. - To facilitate manual rotation of the
disc member 11 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 thedisc member 11 passing through a suitable aperture in the telephone instrument casing (not shown). - To assist implementation of the invention 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 ofapertures 14 may be used provided that the logarithmic exposure relationship is maintained. - It will also be realised that a set of apertures forming minor sound outlets may be included in the front-
housing member 5 with a large aperture being formed in thedisc member 11.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83300910T ATE16879T1 (en) | 1982-02-26 | 1983-02-22 | ELECTROACOUSTIC SIGNALS. |
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 (en) | 1983-09-07 |
EP0087908B1 EP0087908B1 (en) | 1985-12-04 |
Family
ID=10528646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83300910A Expired EP0087908B1 (en) | 1982-02-26 | 1983-02-22 | Electro-acoustic calling devices |
Country Status (15)
Country | Link |
---|---|
EP (1) | EP0087908B1 (en) |
JP (1) | JPS58159099A (en) |
AT (1) | ATE16879T1 (en) |
AU (1) | AU549945B2 (en) |
CA (1) | CA1215163A (en) |
DE (1) | DE3361370D1 (en) |
DK (1) | DK78383A (en) |
GB (1) | GB2115648B (en) |
HK (1) | HK79485A (en) |
IL (1) | IL67935A (en) |
KE (1) | KE3554A (en) |
MY (1) | MY8600266A (en) |
NZ (1) | NZ203265A (en) |
ZA (1) | ZA831054B (en) |
ZW (1) | ZW5283A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0188017A1 (en) * | 1984-12-19 | 1986-07-23 | Philips Electronics Uk Limited | Electroacoustic calling device |
EP0688142A3 (en) * | 1994-06-16 | 1996-11-20 | Akg Akustische Kino Geraete | Acoustic resistance, especially for electroacoustical transducer |
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)
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 (en) * | 1974-05-31 | 1975-12-26 | Klaxon Sa | |
GB2082018A (en) * | 1980-07-31 | 1982-02-24 | Standard Telephones Cables Ltd | Telephone sounder |
-
1983
- 1983-02-14 NZ NZ203265A patent/NZ203265A/en unknown
- 1983-02-16 CA CA000421729A patent/CA1215163A/en not_active Expired
- 1983-02-16 ZA ZA831054A patent/ZA831054B/en unknown
- 1983-02-16 IL IL67935A patent/IL67935A/en unknown
- 1983-02-16 AU AU11492/83A patent/AU549945B2/en not_active Ceased
- 1983-02-22 AT AT83300910T patent/ATE16879T1/en active
- 1983-02-22 DK DK78383A patent/DK78383A/en not_active Application Discontinuation
- 1983-02-22 EP EP83300910A patent/EP0087908B1/en not_active Expired
- 1983-02-22 DE DE8383300910T patent/DE3361370D1/en not_active Expired
- 1983-02-23 GB GB08305038A patent/GB2115648B/en not_active Expired
- 1983-02-25 JP JP58030642A patent/JPS58159099A/en active Pending
- 1983-02-25 ZW ZW52/83A patent/ZW5283A1/en unknown
-
1985
- 1985-08-07 KE KE3554A patent/KE3554A/en unknown
- 1985-10-17 HK HK794/85A patent/HK79485A/en unknown
-
1986
- 1986-12-30 MY MY266/86A patent/MY8600266A/en unknown
Patent Citations (4)
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 (en) * | 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0188017A1 (en) * | 1984-12-19 | 1986-07-23 | Philips Electronics Uk Limited | Electroacoustic calling device |
EP0688142A3 (en) * | 1994-06-16 | 1996-11-20 | Akg Akustische Kino Geraete | Acoustic resistance, especially for electroacoustical transducer |
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 |
---|---|
DE3361370D1 (en) | 1986-01-16 |
ATE16879T1 (en) | 1985-12-15 |
CA1215163A (en) | 1986-12-09 |
JPS58159099A (en) | 1983-09-21 |
ZA831054B (en) | 1984-03-28 |
HK79485A (en) | 1985-10-25 |
KE3554A (en) | 1985-08-30 |
DK78383D0 (en) | 1983-02-22 |
MY8600266A (en) | 1986-12-31 |
GB8305038D0 (en) | 1983-03-30 |
GB2115648B (en) | 1985-03-13 |
NZ203265A (en) | 1985-04-30 |
IL67935A (en) | 1986-04-29 |
ZW5283A1 (en) | 1983-05-11 |
EP0087908B1 (en) | 1985-12-04 |
AU549945B2 (en) | 1986-02-20 |
IL67935A0 (en) | 1983-06-15 |
AU1149283A (en) | 1983-09-01 |
DK78383A (en) | 1983-08-27 |
GB2115648A (en) | 1983-09-07 |
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