FR978341A - Improvements to speakers, telephones, microphones or similar mechanisms for transmitting and receiving moving coil sounds - Google Patents

Improvements to speakers, telephones, microphones or similar mechanisms for transmitting and receiving moving coil sounds

Info

Publication number
FR978341A
FR978341A FR978341DA FR978341A FR 978341 A FR978341 A FR 978341A FR 978341D A FR978341D A FR 978341DA FR 978341 A FR978341 A FR 978341A
Authority
FR
France
Prior art keywords
microphones
telephones
speakers
transmitting
moving coil
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.)
British Communications Corp Ltd
Original Assignee
British Communications Corp Ltd
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 British Communications Corp Ltd filed Critical British Communications Corp Ltd
Application granted granted Critical
Publication of FR978341A publication Critical patent/FR978341A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR978341D 1948-12-30 1948-12-30 Improvements to speakers, telephones, microphones or similar mechanisms for transmitting and receiving moving coil sounds Expired FR978341A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR978341T 1948-12-30

Publications (1)

Publication Number Publication Date
FR978341A true FR978341A (en) 1951-04-12

Family

ID=9520414

Family Applications (1)

Application Number Title Priority Date Filing Date
FR978341D Expired FR978341A (en) 1948-12-30 1948-12-30 Improvements to speakers, telephones, microphones or similar mechanisms for transmitting and receiving moving coil sounds

Country Status (1)

Country Link
FR (1) FR978341A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998496A (en) * 1958-04-29 1961-08-29 Joseph A Hassan Loudspeaker construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998496A (en) * 1958-04-29 1961-08-29 Joseph A Hassan Loudspeaker construction

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