ZA831054B - Electro-acoustic calling devices - Google Patents

Electro-acoustic calling devices

Info

Publication number
ZA831054B
ZA831054B ZA831054A ZA831054A ZA831054B ZA 831054 B ZA831054 B ZA 831054B ZA 831054 A ZA831054 A ZA 831054A ZA 831054 A ZA831054 A ZA 831054A ZA 831054 B ZA831054 B ZA 831054B
Authority
ZA
South Africa
Prior art keywords
housing
electro
calling devices
aperture
intensity
Prior art date
Application number
ZA831054A
Other languages
English (en)
Inventor
Keith John Vickers
Allan George Carr
Original Assignee
Gen 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 Gen Electric Co Plc filed Critical Gen Electric Co Plc
Publication of ZA831054B publication Critical patent/ZA831054B/xx

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

  • 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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Headphones And Earphones (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
ZA831054A 1982-02-26 1983-02-16 Electro-acoustic calling devices ZA831054B (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
ZA831054B true ZA831054B (en) 1984-03-28

Family

ID=10528646

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA831054A ZA831054B (en) 1982-02-26 1983-02-16 Electro-acoustic calling devices

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)

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 (de) * 1994-06-16 1996-04-25 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

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 (de) * 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
EP0087908B1 (de) 1985-12-04
NZ203265A (en) 1985-04-30
ATE16879T1 (de) 1985-12-15
CA1215163A (en) 1986-12-09
IL67935A0 (en) 1983-06-15
IL67935A (en) 1986-04-29
HK79485A (en) 1985-10-25
DK78383D0 (da) 1983-02-22
MY8600266A (en) 1986-12-31
DE3361370D1 (en) 1986-01-16
EP0087908A1 (de) 1983-09-07
GB2115648B (en) 1985-03-13
GB2115648A (en) 1983-09-07
GB8305038D0 (en) 1983-03-30
DK78383A (da) 1983-08-27
KE3554A (en) 1985-08-30
ZW5283A1 (en) 1983-05-11
AU549945B2 (en) 1986-02-20
JPS58159099A (ja) 1983-09-21
AU1149283A (en) 1983-09-01

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