GB563595A - Improvements relating to microphones - Google Patents

Improvements relating to microphones

Info

Publication number
GB563595A
GB563595A GB17445/42A GB1744542A GB563595A GB 563595 A GB563595 A GB 563595A GB 17445/42 A GB17445/42 A GB 17445/42A GB 1744542 A GB1744542 A GB 1744542A GB 563595 A GB563595 A GB 563595A
Authority
GB
United Kingdom
Prior art keywords
opposite sides
diaphragms
diaphragm
microphone
openings
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
GB17445/42A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB563595A publication Critical patent/GB563595A/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
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

563,595. Telephonic transmitters and circuits. BEEKLEY, F. C. Dec. 8, 1942, No. 17445. Convention date, Dec. 26, 1941. [Class 40 (iv)] A microphone cancels ambient or undesired sounds by impressing them in balance at two spaced microphone portions (e.g. two separate diaphragms or opposite sides of the ' same diaphragm) through two adjacent openings spaced apart a small fraction, say quarter, of a wave length of the highest frequency it is desired to cancel. Fig. 1 shows a bent base-plate 10 supporting casings 13 with diaphragms 16 associated with carbon-granule or moving-coil microphones connected in balanced relation, Figs. 2, 3, 4 (not shown), so as to cancel out sounds impressed equally on the two diaphragms. In Fig. 6, the undesired sounds pass through openings 67, 68 to opposite sides of a diaphragm 70 carrying a moving coil 73, whilst in Figs. 7 and 8 undesired sounds pass through two spaced openings 87 (three-eighths of an inch apart) to opposite sides of a diaphragm 82 carrying a carbon-granule microphone 84.
GB17445/42A 1937-06-04 1942-12-08 Improvements relating to microphones Expired GB563595A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14640537A 1937-06-04 1937-06-04
US308239A US2309109A (en) 1937-06-04 1939-12-08 Microphone

Publications (1)

Publication Number Publication Date
GB563595A true GB563595A (en) 1944-08-22

Family

ID=32096763

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17445/42A Expired GB563595A (en) 1937-06-04 1942-12-08 Improvements relating to microphones

Country Status (3)

Country Link
US (1) US2309109A (en)
FR (1) FR920293A (en)
GB (1) GB563595A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147475A (en) * 1983-09-28 1985-05-09 Intech Systems Corp Differential stethoscope
US4672674A (en) * 1982-01-27 1987-06-09 Clough Patrick V F Communications systems
GB2322257A (en) * 1997-02-18 1998-08-19 Mitel Corp Increased acoustic separation for a speakerphone

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2417927A (en) * 1943-03-22 1947-03-25 Automatic Elect Lab Sound direction finder
US2495809A (en) * 1945-09-06 1950-01-31 Rca Corp Signal expansion or compression
US2512173A (en) * 1946-10-05 1950-06-20 Gen Controls Co Automatic valve control for fluid supply in burner systems
US2572376A (en) * 1948-05-28 1951-10-23 Rca Corp Velocity type microphone
US2810786A (en) * 1950-06-12 1957-10-22 Siemens Ag Directional microphone system
US2854511A (en) * 1954-05-18 1958-09-30 Rca Corp Directional microphone
AT226290B (en) * 1961-06-19 1963-03-11 Akg Akustische Kino Geraete Sound receiver with preferably one-sided, optionally adjustable directional characteristic, containing one or more transducer systems working according to the electrostatic principle
US7889882B2 (en) * 2006-12-20 2011-02-15 Leonard Marshall Selectable diaphragm condenser microphone

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672674A (en) * 1982-01-27 1987-06-09 Clough Patrick V F Communications systems
GB2147475A (en) * 1983-09-28 1985-05-09 Intech Systems Corp Differential stethoscope
GB2322257A (en) * 1997-02-18 1998-08-19 Mitel Corp Increased acoustic separation for a speakerphone
GB2322257B (en) * 1997-02-18 1999-04-28 Mitel Corp Circuit to improve transducer separation in handsfree telephone
US6438240B1 (en) 1997-02-18 2002-08-20 Mitel Corporation Circuit to improve transducer separation in handsfree telephone

Also Published As

Publication number Publication date
US2309109A (en) 1943-01-26
FR920293A (en) 1947-04-02

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