GB479328A - Improvements in or relating to sound translating devices - Google Patents

Improvements in or relating to sound translating devices

Info

Publication number
GB479328A
GB479328A GB16550/37A GB1655037A GB479328A GB 479328 A GB479328 A GB 479328A GB 16550/37 A GB16550/37 A GB 16550/37A GB 1655037 A GB1655037 A GB 1655037A GB 479328 A GB479328 A GB 479328A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
paths
sound
tubes
length
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
GB16550/37A
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products 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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB479328A publication Critical patent/GB479328A/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
    • H04R1/342—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 for microphones

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

479,328. Sound directing appliances. ELECTRICAL RESEARCH PRODUCTS. Inc. June 15, 1937, No. 16550. Convention date, June 18, 1936. [Class 13] [Also in Group XXXIX] In a sound-translating device comprising a Transmitter and a diaphragm and means forming a plurality of paths for sound waves passing to the diaphragm, the paths are in the same direction, are of different lengths, and terminate in a common plane adjacent the diaphragm so that the device is responsive substantially only to waves travelling in the direction of the said paths. As shown the paths are formed by spirally arranged tubes 14 mounted in a ring 16 threaded into a coupler member 13 having one end adjacent the diaphragm 26 of the transmitter 11. The coupler is divided by a member 20 into compartments filled with damping material 21, such as hair felt, and an acoustic resistance screen 22 is disposed across the coplanar ends of the tubes 14. The lengths of the tubes increase in an arithmetic progression, the shortest tube having a length of about one inch and the longest tube being about five feet in length and approximately equal to the wave length of the lowest frequency for which the device is to be directional.
GB16550/37A 1936-06-18 1937-06-15 Improvements in or relating to sound translating devices Expired GB479328A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US479328XA 1936-06-18 1936-06-18

Publications (1)

Publication Number Publication Date
GB479328A true GB479328A (en) 1938-02-03

Family

ID=21951810

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16550/37A Expired GB479328A (en) 1936-06-18 1937-06-15 Improvements in or relating to sound translating devices

Country Status (2)

Country Link
FR (1) FR823065A (en)
GB (1) GB479328A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2507849A1 (en) * 1981-06-15 1982-12-17 Western Electric Co ACOUSTIC APPARATUS WITH DIRECTIONAL RESPONSE DIAGRAM

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2507849A1 (en) * 1981-06-15 1982-12-17 Western Electric Co ACOUSTIC APPARATUS WITH DIRECTIONAL RESPONSE DIAGRAM

Also Published As

Publication number Publication date
FR823065A (en) 1938-01-13

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