FR824971A - Acoustic devices - Google Patents

Acoustic devices

Info

Publication number
FR824971A
FR824971A FR824971DA FR824971A FR 824971 A FR824971 A FR 824971A FR 824971D A FR824971D A FR 824971DA FR 824971 A FR824971 A FR 824971A
Authority
FR
France
Prior art keywords
acoustic devices
acoustic
devices
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.)
Expired
Application number
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR824971A publication Critical patent/FR824971A/en
Expired 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 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
FR824971D 1936-08-01 1937-07-30 Acoustic devices Expired FR824971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US215787XA 1936-08-01 1936-08-01

Publications (1)

Publication Number Publication Date
FR824971A true FR824971A (en) 1938-02-21

Family

ID=21805020

Family Applications (1)

Application Number Title Priority Date Filing Date
FR824971D Expired FR824971A (en) 1936-08-01 1937-07-30 Acoustic devices

Country Status (4)

Country Link
BE (1) BE422587A (en)
CH (1) CH215787A (en)
FR (1) FR824971A (en)
GB (1) GB481351A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE854670C (en) * 1948-10-02 1952-11-06 Electroacustic Ges M B H Damping device for telephones and microphones
DE947083C (en) * 1952-10-01 1956-08-09 Standard Elek K Ag Electromagnetic sound device in capsule form
NL8501650A (en) * 1985-06-07 1987-01-02 Philips Nv ELECTRODYNAMIC CONVERTER WITH A TWO-PIECE MEMBRANE.
NL8602451A (en) * 1986-09-29 1988-04-18 Philips Nv SPEAKER WITH A TWO-PIECE MEMBRANE FOR USE AS A CAR SPEAKER.

Also Published As

Publication number Publication date
CH215787A (en) 1941-07-15
GB481351A (en) 1938-03-09
BE422587A (en)

Similar Documents

Publication Publication Date Title
FR827344A (en) Improvements to vibrating devices.
FR822144A (en) Acoustic devices
FR820481A (en) Piezoelectric devices
FR828982A (en) Sound reproducing devices
FR829898A (en) Piezoelectric devices
FR822488A (en) Piezoelectric devices
FR824971A (en) Acoustic devices
FR844299A (en) Acoustic devices
FR815899A (en) Acoustic rectifying devices
FR822220A (en) scarecrow sound
FR806729A (en) Acoustic warning device
FR821898A (en) Piezoelectric devices
FR867849A (en) Acoustic devices
FI18122A (en) Elastic plasterboard
FR814189A (en) Violin-bass
FI16985A (en) Spännhank
FI17604A (en) Värmeutväxlare
FI16896A (en) Isolering
FI16927A (en) Suksiside
FI16949A (en) Tandpaste
FI16952A (en) Hålstenstak
FI16959A (en) Smörjpress
FI16979A (en) Självregistrerande kartoteklåda
FI16874A (en) Sovsäck
FI16997A (en) Hopsättbar rörmast