NL70171C - - Google Patents

Info

Publication number
NL70171C
NL70171C NL70171DA NL70171C NL 70171 C NL70171 C NL 70171C NL 70171D A NL70171D A NL 70171DA NL 70171 C NL70171 C NL 70171C
Authority
NL
Netherlands
Application number
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.)
Publication of NL70171C publication Critical patent/NL70171C/xx

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
NL70171D 1947-08-06 NL70171C (enrdf_load_html_response)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2572525X 1947-08-06

Publications (1)

Publication Number Publication Date
NL70171C true NL70171C (enrdf_load_html_response)

Family

ID=4570209

Family Applications (1)

Application Number Title Priority Date Filing Date
NL70171D NL70171C (enrdf_load_html_response) 1947-08-06

Country Status (6)

Country Link
US (1) US2572525A (enrdf_load_html_response)
BE (1) BE484178A (enrdf_load_html_response)
CH (1) CH269350A (enrdf_load_html_response)
DE (1) DE874019C (enrdf_load_html_response)
FR (1) FR969788A (enrdf_load_html_response)
NL (1) NL70171C (enrdf_load_html_response)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE954967C (de) * 1952-11-01 1956-12-27 Standard Elek K Ag Kohlemikrofon mit einer beweglichen und einer festen Elektrode, die in mehrere Teilelektroden unterteilt ist
DE1234267B (de) * 1964-04-04 1967-02-16 Telefonbau Kohlemikrofon

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US557588A (en) * 1896-04-07 Telephony
US563395A (en) * 1896-07-07 Telephone-transmitter
US778409A (en) * 1903-04-20 1904-12-27 Oscar M Frykman Telephone apparatus.
US1117231A (en) * 1911-11-13 1914-11-17 Western Electric Co Loud-speaking transmitter.
US2179733A (en) * 1934-11-27 1939-11-14 Siemens Brothers & Co Ltd Microphone
US2149628A (en) * 1935-09-16 1939-03-07 Associated Electric Lab Inc Telephone transmitter
US2140859A (en) * 1936-12-14 1938-12-20 Siemens Ag Telephone transmitter
GB513160A (en) * 1938-03-01 1939-10-05 Donald Mcmillan Improvements in or relating to microphones
US2435920A (en) * 1943-09-20 1948-02-10 Electro Voice Mfg Co Inc Balanced granular microphone

Also Published As

Publication number Publication date
BE484178A (enrdf_load_html_response)
FR969788A (fr) 1950-12-26
US2572525A (en) 1951-10-23
CH269350A (de) 1950-06-30
DE874019C (de) 1953-04-20

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