FR716994A - Perfectionnements aux dispositifs acoustiques - Google Patents

Perfectionnements aux dispositifs acoustiques

Info

Publication number
FR716994A
FR716994A FR716994DA FR716994A FR 716994 A FR716994 A FR 716994A FR 716994D A FR716994D A FR 716994DA FR 716994 A FR716994 A FR 716994A
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
English (en)
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products 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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Application granted granted Critical
Publication of FR716994A publication Critical patent/FR716994A/fr
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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR716994D 1930-05-14 1931-05-13 Perfectionnements aux dispositifs acoustiques Expired FR716994A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US452154A US1905704A (en) 1930-05-14 1930-05-14 Acoustic device

Publications (1)

Publication Number Publication Date
FR716994A true FR716994A (fr) 1931-12-30

Family

ID=23795266

Family Applications (1)

Application Number Title Priority Date Filing Date
FR716994D Expired FR716994A (fr) 1930-05-14 1931-05-13 Perfectionnements aux dispositifs acoustiques

Country Status (3)

Country Link
US (1) US1905704A (cs)
BE (1) BE379817A (cs)
FR (1) FR716994A (cs)

Also Published As

Publication number Publication date
US1905704A (en) 1933-04-25
BE379817A (cs)

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