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FR511814A - Improvements to telephone transmitters - Google Patents

Improvements to telephone transmitters

Info

Publication number
FR511814A
FR511814A FR511814A FR511814DA FR511814A FR 511814 A FR511814 A FR 511814A FR 511814 A FR511814 A FR 511814A FR 511814D A FR511814D A FR 511814DA FR 511814 A FR511814 A FR 511814A
Authority
FR
France
Prior art keywords
telephone transmitters
transmitters
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
FR511814A
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.)
MIESSNER INVENTIONS Corp
Miessner Inventions Inc
Original Assignee
MIESSNER INVENTIONS Corp
Miessner Inventions Inc
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 MIESSNER INVENTIONS Corp, Miessner Inventions Inc filed Critical MIESSNER INVENTIONS Corp
Application granted granted Critical
Publication of FR511814A publication Critical patent/FR511814A/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
    • H04R1/38—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 in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Telephone Set Structure (AREA)
FR511814A 1919-03-12 1920-03-17 Improvements to telephone transmitters Expired FR511814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US282155A US1507081A (en) 1919-03-12 1919-03-12 Telephone transmitter

Publications (1)

Publication Number Publication Date
FR511814A true FR511814A (en) 1921-01-05

Family

ID=23080327

Family Applications (1)

Application Number Title Priority Date Filing Date
FR511814A Expired FR511814A (en) 1919-03-12 1920-03-17 Improvements to telephone transmitters

Country Status (4)

Country Link
US (1) US1507081A (en)
DE (1) DE341557C (en)
FR (1) FR511814A (en)
GB (1) GB140070A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127285A (en) * 2015-07-02 2015-12-09 北京灵隆科技有限公司 Speaker mesh processing device and processing method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912821C (en) * 1935-11-13 1954-06-03 Siemens Ag Facility for voice transmission from noisy rooms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127285A (en) * 2015-07-02 2015-12-09 北京灵隆科技有限公司 Speaker mesh processing device and processing method

Also Published As

Publication number Publication date
US1507081A (en) 1924-09-02
DE341557C (en) 1921-10-05
GB140070A (en) 1921-07-08

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