GB455635A - Improvements in or relating to sound-translating devices - Google Patents

Improvements in or relating to sound-translating devices

Info

Publication number
GB455635A
GB455635A GB12391/35A GB1239135A GB455635A GB 455635 A GB455635 A GB 455635A GB 12391/35 A GB12391/35 A GB 12391/35A GB 1239135 A GB1239135 A GB 1239135A GB 455635 A GB455635 A GB 455635A
Authority
GB
United Kingdom
Prior art keywords
tube
sound
acoustic
april
diaphragm
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
GB12391/35A
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 GB455635A publication Critical patent/GB455635A/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

Abstract

455,635. Acoustic wave filters. ELECTRICAL RESEARCH PRODUCTS, Inc., 195, Broadway, New York, U.S.A.-(Assignees of Marshall, R. N.; 115, North 6th Street, Newark, New Jersey, U.S.A.) April 24, 1935, No. 12391. Convention date, April 25, 1934. Addition to 382,268. [Class 13] [See also Group XXXIX] Comprises a number of improvements in the device claimed in Claim 1 of the parent Specification in which an acoustic path between the two sides of the diaphragm of a sound-translating device has acoustic mass and stiffness so proportioned that the sound waves are reinforced at low frequencies. As shown in Fig. 1, the casing 51 of a moving-coil microphone is divided by a partition 107 into compartments connected acoustically by a tube 108 and both open to the outer air through perforated end covers 53, 56. In a modification, Fig. 13, the acoustic path from the rear to the front of the diaphragm is by way of the air gap in the magnetic circuit and a tube 170 open to the outer air. In modifications, Figs. 17 to 21 and 22 to 24 (not shown), the tube is coiled within the casing. Specification 388,069, [Group XXXIX], is referred to.
GB12391/35A 1934-04-25 1935-04-24 Improvements in or relating to sound-translating devices Expired GB455635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US455635XA 1934-04-25 1934-04-25

Publications (1)

Publication Number Publication Date
GB455635A true GB455635A (en) 1936-10-26

Family

ID=21938633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12391/35A Expired GB455635A (en) 1934-04-25 1935-04-24 Improvements in or relating to sound-translating devices

Country Status (1)

Country Link
GB (1) GB455635A (en)

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