AU549945B2 - Electro-acoustic calling devices - Google Patents

Electro-acoustic calling devices

Info

Publication number
AU549945B2
AU549945B2 AU11492/83A AU1149283A AU549945B2 AU 549945 B2 AU549945 B2 AU 549945B2 AU 11492/83 A AU11492/83 A AU 11492/83A AU 1149283 A AU1149283 A AU 1149283A AU 549945 B2 AU549945 B2 AU 549945B2
Authority
AU
Australia
Prior art keywords
housing
electro
calling devices
aperture
intensity
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.)
Ceased
Application number
AU11492/83A
Other versions
AU1149283A (en
Inventor
Allan George Carr
Keith John Vickers
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.)
General Electric Co PLC
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
Publication of AU1149283A publication Critical patent/AU1149283A/en
Application granted granted Critical
Publication of AU549945B2 publication Critical patent/AU549945B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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 

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (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)
  • Headphones And Earphones (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

An electro-acoustic transducer (2) mounted in a housing (5, 6) in which a volume control is provided by an aperture (7) in the front of the housing (5) and a rotatable shutter plate (11) which is mounted on the front of the housing (5) and which has a plurality of smaller apertures (14). The smaller apertures (14) are positioned in such a way that linear movement of the shutter plate (11) causes a logarithmic change in the exposure of the aperture (7) in the front of the housing (5) to give a logarithmic change in the intensity of the sound output such that the linear movement causes an apparent linear change in the intensity of sound as heard by a human ear.
AU11492/83A 1982-02-26 1983-02-16 Electro-acoustic calling devices Ceased AU549945B2 (en)

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
AU1149283A AU1149283A (en) 1983-09-01
AU549945B2 true AU549945B2 (en) 1986-02-20

Family

ID=10528646

Family Applications (1)

Application Number Title Priority Date Filing Date
AU11492/83A Ceased AU549945B2 (en) 1982-02-26 1983-02-16 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)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168875A (en) * 1984-12-19 1986-06-25 Philips Electronic Associated Electroacoustic calling device
AT400910B (en) * 1994-06-16 1996-04-25 Akg Akustische Kino Geraete ACOUSTIC RESISTANCE, ESPECIALLY FOR ELECTROACOUSTIC TRANSDUCERS
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

Family Cites Families (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
FR2273335B1 (en) * 1974-05-31 1979-05-25 Klaxon Sa
GB2082018B (en) * 1980-07-31 1983-10-12 Standard Telephones Cables Ltd Telephone sounder

Also Published As

Publication number Publication date
ATE16879T1 (en) 1985-12-15
GB8305038D0 (en) 1983-03-30
KE3554A (en) 1985-08-30
DK78383A (en) 1983-08-27
AU1149283A (en) 1983-09-01
MY8600266A (en) 1986-12-31
GB2115648A (en) 1983-09-07
IL67935A0 (en) 1983-06-15
JPS58159099A (en) 1983-09-21
CA1215163A (en) 1986-12-09
HK79485A (en) 1985-10-25
EP0087908A1 (en) 1983-09-07
NZ203265A (en) 1985-04-30
ZW5283A1 (en) 1983-05-11
EP0087908B1 (en) 1985-12-04
DE3361370D1 (en) 1986-01-16
DK78383D0 (en) 1983-02-22
IL67935A (en) 1986-04-29
ZA831054B (en) 1984-03-28
GB2115648B (en) 1985-03-13

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