[go: up one dir, main page]

US2153044A - Earcap for telephone receivers - Google Patents

Earcap for telephone receivers Download PDF

Info

Publication number
US2153044A
US2153044A US167335A US16733537A US2153044A US 2153044 A US2153044 A US 2153044A US 167335 A US167335 A US 167335A US 16733537 A US16733537 A US 16733537A US 2153044 A US2153044 A US 2153044A
Authority
US
United States
Prior art keywords
earcap
diaphragm
channels
apertures
telephone receivers
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 - Lifetime
Application number
US167335A
Other languages
English (en)
Inventor
Jarnak Niels Poul Robert
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
Application granted granted Critical
Publication of US2153044A publication Critical patent/US2153044A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 

Definitions

  • the present invention refers to the design or construction of an earcap for a telephone receiver orsirnilar apparatus, also such a device as the mouth-piece of a microphone, and it 5 consists in the application of a multi-cavity resonator comprising a plurality of channels open at both ends and incorporated in the earoap in such a way that said resonator has access both to the chamber of which the vibrating diaphragm of the apparatus makes a part and to the chamber outside, which chamber may be formed between thev earcap and the cavity oi the ear; altogether this means that the multicavity resonator has access to the free air outside the apparatus.
  • the above mentioned multi-cavity resonator is added to the conventional construction of an earcap in such a way that the standing airwaves oscillated within the channels of the resonator by the vibrations of the diaphragm enact to suppress the resonance vibrations of the diaphragm itself.
  • this invention is related tomy former invention Acoustical apparatus, Brit- .ish Patent No. 456,414, and U. S. application Ser. No. 83,013, led June 2, 1936, according to which a new method of loading the vibrating diaphragm acoustically makes it possibleto oscillate standing interfering air wayes which show an optimum eiiect in counteracting theresonance vibrations of the diaphragm, if the resonance. frequencies of these standing Waves form a series of numbers the terms of which have the proportion 2:3.
  • the invention has primarily signicance for telephone receivers or similar apparatus of which .
  • the accompanying drawing indicates an example of its application to a telephone receiver (Cl. IWB-2) equipped with two slightly diierent earcaps made in accordance with the invention,l
  • Fig. l indicates a section through the earcap which is xed to a telephone receiver casing including the diaphragm and viewed from the one side.
  • Fig. 2 shows the same earcap viewed outside from that side which is turned to the ear.
  • Fig. 3 indicates 'a section through a slightly changed construction viewed from the one side, of which Fig. 4 is a section through the same showing the design of the multi-cavity resonator.
  • i is an elastic diaphragm clamped between the receiver casing 2 and the earcap 3, and said diaphragm may be cscillated for a desired vibration by means of the electro-magnetic device placed within the receiver casing.
  • the channels In order to obtain a suitable form of the channels, they are arranged as indicated on the drawing whereby their length, as mentioned before, conditions the proportion of 3:2 between their frequencies of resonance respectively. Therefore the length of the channel 8 in proportion to the channel il' must be approximately 2:3; and the proportion between the length of the channel i and the length of the channel 8 must also be approximately 2:3, and so forth concerning the rest oi the channels.
  • the resonance frequencies of the standing waves produced therein'by the vibrations oi" the diaphragm form accordinglya series of numbers, the terms of which have the proportion 2:3.
  • the dimensions and the material of the vibrating diaphragm determines its fundamental resonance frequency, it may be desirable to adjust the resonance frequencies of the standing waves within the channels of the multi-cavity resonator in consideration hereof, consequently it may be required to alter the form, numbers and the length of ⁇ these channels.
  • Fig. 3 therefore is shown a slightly altered construction of, the earcap itself, whereby the length of the channels respectively has been lil doubled as compared to the length shown in Fig. 1 and Fig. 2.
  • Fig. 3 and Fig. 4 this is obtained by placing two similar multi-cavity resonators together, whereby one corresponding channel in each set is interconnected through the apertures Iii shown in Fig. 4.
  • a multi-cavity resonator comprising a plurality of separate channels open at both ends and so incorporated in the said body that on the one hand said.
  • multi-cavity resonator has access'to the chamber of which the vibrating diaphragm makes a part and on the other hand hasaccess to the space outside the said body.
  • a sound conveying member comprising a suitably formed body for clamping an elastic diaphragm, said member having a central opening adopted to conduct the sound waves to or from the said diaphragm, in the said member ⁇ a plurality of separate channels open at both ends dening a multi-cavity resonator, the apertures of these channels at the one end connecting with the said central opening, and the apertures at the other ends of these channels connecting with the external atmosphere.
  • a sound conveying member comprising a suitably formed body for clamping an elastic diaphragm, said member having a central opening adopted to conduct the sound waves to or from the said diaphragm, in the said member a plurality of separate channels open at both ends defining a multi-cavity resonator, the apertures of these channels at the one endconnecting with the said central opening, and the apertures of these channels at the other end also connecting with the central opening.

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)
US167335A 1936-10-05 1937-10-05 Earcap for telephone receivers Expired - Lifetime US2153044A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK55033T 1936-10-05
FR841086T 1938-07-25

Publications (1)

Publication Number Publication Date
US2153044A true US2153044A (en) 1939-04-04

Family

ID=8142986

Family Applications (1)

Application Number Title Priority Date Filing Date
US167335A Expired - Lifetime US2153044A (en) 1936-10-05 1937-10-05 Earcap for telephone receivers

Country Status (5)

Country Link
US (1) US2153044A (da)
CH (1) CH200196A (da)
DK (1) DK55033C (da)
FR (1) FR841086A (da)
GB (1) GB487566A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3084229A (en) * 1960-03-11 1963-04-02 Ampex Electrostatic earphone
US4189627A (en) * 1978-11-27 1980-02-19 Bell Telephone Laboratories, Incorporated Electroacoustic transducer filter assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE847921C (de) * 1950-10-29 1952-08-28 Lab Wennebostel Dr Ing Sennhei Lautsprecher mit Rohrleitung
DE940167C (de) * 1953-07-01 1956-03-15 Carl Schmidbauer Einsprachevorrichtung fuer ein raumschallunempfindliches und akustisch rueckkopplungsfreies Mikrofon

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3084229A (en) * 1960-03-11 1963-04-02 Ampex Electrostatic earphone
US4189627A (en) * 1978-11-27 1980-02-19 Bell Telephone Laboratories, Incorporated Electroacoustic transducer filter assembly

Also Published As

Publication number Publication date
CH200196A (de) 1938-09-30
DK55033C (da) 1938-08-01
GB487566A (en) 1938-06-22
FR841086A (fr) 1939-05-10

Similar Documents

Publication Publication Date Title
KR0158884B1 (ko) 전기 음향 변환기 및 음향 재생 시스템
US4407389A (en) Vented acoustic ear mold for hearing aids
US3048668A (en) Transducer suspension system
US4442917A (en) Vented acoustic ear mold for hearing aids
US4010820A (en) Acoustic ear mold for hearing aid
US5115473A (en) Transducer having two ducts
US5661271A (en) Acoustic speaker enclosure having a stacked construction
WO1992021218A1 (en) Hearing aid
US3989905A (en) Microphone
US3767005A (en) Flat loudspeaker with enhanced low frequency
GB2332805A (en) Speaker
US4637489A (en) Electroacoustic transducer
US2621751A (en) Earcap for earphones
US1715831A (en) Arrangement for eliminating disturbances in receiving sound waves
JP2643956B2 (ja) インナーイヤー型ヘッドホン
US2153044A (en) Earcap for telephone receivers
US4949387A (en) Electro-acoustic transducer unit
US2835735A (en) Anti-shock transducer
JPS60142699A (ja) ダイナミツク型レシ−バ
US1757459A (en) Sound-translating system
GB403843A (en) Improvements in or relating to resonating apparatus associated with loud-speakers and sound diffusers
JPS57131195A (en) Noise preventing microphone device of band limiting type
CN115278443B (zh) 一种扬声器
US2083537A (en) Electroacoustical translating device
US1955800A (en) Acoustic device