FR779146A - Improvements to telephone microphones - Google Patents

Improvements to telephone microphones

Info

Publication number
FR779146A
FR779146A FR779146DA FR779146A FR 779146 A FR779146 A FR 779146A FR 779146D A FR779146D A FR 779146DA FR 779146 A FR779146 A FR 779146A
Authority
FR
France
Prior art keywords
telephone microphones
microphones
telephone
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co 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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Application granted granted Critical
Publication of FR779146A publication Critical patent/FR779146A/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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones
FR779146D 1933-10-03 1934-10-01 Improvements to telephone microphones Expired FR779146A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2718533A GB423257A (en) 1933-10-03 1933-10-03 Improvements in or relating to telephone transmitters

Publications (1)

Publication Number Publication Date
FR779146A true FR779146A (en) 1935-03-29

Family

ID=10255563

Family Applications (1)

Application Number Title Priority Date Filing Date
FR779146D Expired FR779146A (en) 1933-10-03 1934-10-01 Improvements to telephone microphones

Country Status (3)

Country Link
BE (1) BE405299A (en)
FR (1) FR779146A (en)
GB (1) GB423257A (en)

Also Published As

Publication number Publication date
GB423257A (en) 1935-01-29
BE405299A (en)

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