DK157646C - Akustisk transmissionssystem - Google Patents

Akustisk transmissionssystem

Info

Publication number
DK157646C
DK157646C DK624474A DK624474A DK157646C DK 157646 C DK157646 C DK 157646C DK 624474 A DK624474 A DK 624474A DK 624474 A DK624474 A DK 624474A DK 157646 C DK157646 C DK 157646C
Authority
DK
Denmark
Prior art keywords
transmission system
acoustic transmission
acoustic
transmission
Prior art date
Application number
DK624474A
Other languages
English (en)
Other versions
DK157646B (da
DK624474A (da
Inventor
Elmer V Carlson
Original Assignee
Industrial Research Prod Inc
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 Industrial Research Prod Inc filed Critical Industrial Research Prod Inc
Publication of DK624474A publication Critical patent/DK624474A/da
Publication of DK157646B publication Critical patent/DK157646B/da
Application granted granted Critical
Publication of DK157646C publication Critical patent/DK157646C/da

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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/48—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using constructional means for obtaining a desired frequency response

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)
DK624474A 1974-02-20 1974-11-29 Akustisk transmissionssystem DK157646C (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44403674A 1974-02-20 1974-02-20
US44403674 1974-02-20

Publications (3)

Publication Number Publication Date
DK624474A DK624474A (da) 1975-10-20
DK157646B DK157646B (da) 1990-01-29
DK157646C true DK157646C (da) 1990-07-16

Family

ID=23763226

Family Applications (1)

Application Number Title Priority Date Filing Date
DK624474A DK157646C (da) 1974-02-20 1974-11-29 Akustisk transmissionssystem

Country Status (2)

Country Link
DK (1) DK157646C (da)
GB (1) GB1495292A (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT379927B (de) * 1984-07-18 1986-03-10 Akg Akustische Kino Geraete Leichte hoer-sprechgarnitur
GB2162342B (en) * 1984-07-25 1987-09-30 Loughran Edward Alarm time-pieces

Also Published As

Publication number Publication date
DE2506921B2 (de) 1977-06-23
DE2506921A1 (de) 1975-08-28
GB1495292A (en) 1977-12-14
DK157646B (da) 1990-01-29
DK624474A (da) 1975-10-20

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Legal Events

Date Code Title Description
PUP Patent expired