GB666494A - Improvements in and relating to directional microphones - Google Patents

Improvements in and relating to directional microphones

Info

Publication number
GB666494A
GB666494A GB26406/49A GB2640648A GB666494A GB 666494 A GB666494 A GB 666494A GB 26406/49 A GB26406/49 A GB 26406/49A GB 2640648 A GB2640648 A GB 2640648A GB 666494 A GB666494 A GB 666494A
Authority
GB
United Kingdom
Prior art keywords
systems
sound
apertures
give rise
frequency band
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
GB26406/49A
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.)
Hasler AG
Original Assignee
Hasler AG
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 Hasler AG filed Critical Hasler AG
Publication of GB666494A publication Critical patent/GB666494A/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

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

666,494. Directional microphones. HASLER AKT.-GES. WERKE FUR TELEPHONIE UND PRAZISIONMECHANIK. Oct. 11, 1948 [April 14, 1948], No. 26406/49. Drawings to Specification. Class 40 (iv). A directional microphone comprises two transducers housed in a casing with two acoustically non-communicating systems, each comprising two sound-inlet apertures such that with equal sound pressures at the entrances of the two systems the output voltage is zero, the distance between corresponding apertures of the two systems being chosen so that when sound arrives from the sensitive direction the wanted frequency band to be transmitted lies between the frequencies which give rise to the first and second interference minima and the two apertures of each system being spaced so that when sound arrives from the insensitive direction the frequency band transmitted lies at least partially below the frequency which would give rise to the first interference minimum were only one of the two systems effective. In the embodiments described the transducers are electromagnetic. The Specification contains a mathematical analysis showing how the spacings are to be calculated.
GB26406/49A 1948-04-14 1948-10-11 Improvements in and relating to directional microphones Expired GB666494A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH666494X 1948-04-14

Publications (1)

Publication Number Publication Date
GB666494A true GB666494A (en) 1952-02-13

Family

ID=4527330

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26406/49A Expired GB666494A (en) 1948-04-14 1948-10-11 Improvements in and relating to directional microphones

Country Status (2)

Country Link
CH (1) CH289422A (en)
GB (1) GB666494A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371805A (en) * 1992-02-21 1994-12-06 Matsushita Electric Industrial Co., Ltd. Speaker and speaker system employing the same
US7840013B2 (en) 2003-07-01 2010-11-23 Mitel Networks Corporation Microphone array with physical beamforming using omnidirectional microphones

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060282A (en) * 1957-07-26 1962-10-23 Baldwin Piano Co Electroacoustic transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371805A (en) * 1992-02-21 1994-12-06 Matsushita Electric Industrial Co., Ltd. Speaker and speaker system employing the same
US7840013B2 (en) 2003-07-01 2010-11-23 Mitel Networks Corporation Microphone array with physical beamforming using omnidirectional microphones

Also Published As

Publication number Publication date
CH289422A (en) 1953-03-15

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