FR778727A - Improvements to electro-dynamic loudspeakers - Google Patents

Improvements to electro-dynamic loudspeakers

Info

Publication number
FR778727A
FR778727A FR778727DA FR778727A FR 778727 A FR778727 A FR 778727A FR 778727D A FR778727D A FR 778727DA FR 778727 A FR778727 A FR 778727A
Authority
FR
France
Prior art keywords
electro
dynamic loudspeakers
loudspeakers
dynamic
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)
Inventor
Jean Kressmann
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 filed Critical
Application granted granted Critical
Publication of FR778727A publication Critical patent/FR778727A/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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
FR778727D 1933-12-09 1933-12-09 Improvements to electro-dynamic loudspeakers Expired FR778727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR778727T 1933-12-09

Publications (1)

Publication Number Publication Date
FR778727A true FR778727A (en) 1935-03-22

Family

ID=9202322

Family Applications (1)

Application Number Title Priority Date Filing Date
FR778727D Expired FR778727A (en) 1933-12-09 1933-12-09 Improvements to electro-dynamic loudspeakers

Country Status (1)

Country Link
FR (1) FR778727A (en)

Similar Documents

Publication Publication Date Title
FR791123A (en) Electro-dynamic speaker
FR43928E (en) Loudspeaker enhancements
FR769406A (en) Improvements made to electrical amplifier tubes
FR777970A (en) Improvement to anti-haze
FR778727A (en) Improvements to electro-dynamic loudspeakers
FR753538A (en) Improvements to electro-dynamic diffusers
FR827276A (en) Improvements to electrodynamic loudspeakers
FR825005A (en) Improvements to electrodynamic loudspeakers
FR789133A (en) Improvements to thermo-ionic amplifiers
FR776667A (en) Improvements to presses
FR765541A (en) Improvements to cameras
FR806607A (en) Improvements to the speakers
FR768638A (en) Electro-dynamic speaker
FR749275A (en) Improvements to electrodynamic loudspeakers
FR779146A (en) Improvements to telephone microphones
FR793572A (en) Improvements to electrodynamic loudspeakers
FR823417A (en) Loudspeaker enhancements
FR752213A (en) Improvements to bras
FR753441A (en) Electro-dynamic speaker
FR767980A (en) Improvements to disconnectors
FR777264A (en) Loudspeaker enhancements
FR755136A (en) Improvements to thermo-ionic lamps
FR760961A (en) Improvements to hearing devices
FR766551A (en) Improvements to horn speakers
FR818761A (en) Improvements to electrodynamic loudspeakers