FR661244A - Method and device for amplifying and diffusing sound waves - Google Patents

Method and device for amplifying and diffusing sound waves

Info

Publication number
FR661244A
FR661244A FR661244DA FR661244A FR 661244 A FR661244 A FR 661244A FR 661244D A FR661244D A FR 661244DA FR 661244 A FR661244 A FR 661244A
Authority
FR
France
Prior art keywords
amplifying
sound waves
diffusing sound
diffusing
waves
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
Armand-Fernand Ephraim
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 FR661244A publication Critical patent/FR661244A/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
    • H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR661244D 1928-01-20 1928-01-20 Method and device for amplifying and diffusing sound waves Expired FR661244A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR661244T 1928-01-20

Publications (1)

Publication Number Publication Date
FR661244A true FR661244A (en) 1929-07-23

Family

ID=9010773

Family Applications (1)

Application Number Title Priority Date Filing Date
FR661244D Expired FR661244A (en) 1928-01-20 1928-01-20 Method and device for amplifying and diffusing sound waves

Country Status (1)

Country Link
FR (1) FR661244A (en)

Similar Documents

Publication Publication Date Title
FR675258A (en) Evaporation method and device
FR736005A (en) Sound radiation device and method for its manufacture
FR661244A (en) Method and device for amplifying and diffusing sound waves
FR681290A (en) Method and device for the transmission of news by telegraph
FR671434A (en) Device for amplifying the sound of the piano
FR694866A (en) Device for sound and speaking cinematography
FR681288A (en) Electromagnetic device for recording and reproducing acoustic oscillations
FR676389A (en) Method and device for electromagnetic reproduction of sound
FR711148A (en) Method and device for photographic sound recording
FR564568A (en) Method and device for sound insulation preventing the reproduction of parasitic noises in sound amplifiers
FR868496A (en) Device for amplifying short waves
FR699527A (en) Device for disinfecting microphones and telephone headphones
FR655776A (en) Apparatus for amplifying and projecting sound from aerial apparatus
FR666300A (en) Amplifier device used in the last stage for the reproduction of sounds independent of frequency
FR712588A (en) Device for receiving and reproducing acoustic oscillations
FR564369A (en) Device for the reproduction and amplification of acoustic waves
FR38818E (en) Sound film and device for its reproduction
FR596390A (en) Method and device for locating hidden sound sources in the field
FR673893A (en) Method and device for the manufacture of phonograph records
FR662082A (en) Method and device for drying films
FR708416A (en) Improvement in the process and device for the manufacture of lead pipes
FR714774A (en) Method and apparatus for sound tracking
FR737017A (en) Method and device for resting and drying wheat
FR637861A (en) Device for amplifying and recording sounds transmitted by telephone
FR683423A (en) Method and device for decatising tissue