FR620883A - Improvements to speakerphone devices for telephony - Google Patents

Improvements to speakerphone devices for telephony

Info

Publication number
FR620883A
FR620883A FR620883DA FR620883A FR 620883 A FR620883 A FR 620883A FR 620883D A FR620883D A FR 620883DA FR 620883 A FR620883 A FR 620883A
Authority
FR
France
Prior art keywords
telephony
speakerphone devices
speakerphone
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)
Inventor
Charles-Albert Renaud
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 FR620883A publication Critical patent/FR620883A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
    • G10K11/025—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators horns for impedance matching

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
FR620883D 1926-08-30 1926-08-30 Improvements to speakerphone devices for telephony Expired FR620883A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR620883T 1926-08-30

Publications (1)

Publication Number Publication Date
FR620883A true FR620883A (en) 1927-04-30

Family

ID=8984708

Family Applications (1)

Application Number Title Priority Date Filing Date
FR620883D Expired FR620883A (en) 1926-08-30 1926-08-30 Improvements to speakerphone devices for telephony

Country Status (1)

Country Link
FR (1) FR620883A (en)

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