WO1981000656A1 - Lineariseur a cavite pour coupleur acoustique - Google Patents

Lineariseur a cavite pour coupleur acoustique Download PDF

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Publication number
WO1981000656A1
WO1981000656A1 PCT/AU1980/000057 AU8000057W WO8100656A1 WO 1981000656 A1 WO1981000656 A1 WO 1981000656A1 AU 8000057 W AU8000057 W AU 8000057W WO 8100656 A1 WO8100656 A1 WO 8100656A1
Authority
WO
WIPO (PCT)
Prior art keywords
acoustic coupler
cavity
plug
acoustic
handset
Prior art date
Application number
PCT/AU1980/000057
Other languages
English (en)
Inventor
D Whitby
Original Assignee
Electro Med Eng Pty Ltd
D Whitby
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 Electro Med Eng Pty Ltd, D Whitby filed Critical Electro Med Eng Pty Ltd
Priority to AU63929/80A priority Critical patent/AU6392980A/en
Publication of WO1981000656A1 publication Critical patent/WO1981000656A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
    • H04M1/2155—Acoustic coupling

Definitions

  • This invention relates to improvements in acoustic couplers for the transmission of computer or other data over telephone lines.
  • Acoustic couplers are used for the transmission and reception of encoded data signals by coupling the encoded signal in audio frequency sound form from a suitable transducer to the telephone handset microphone, and from the telephone handset receiver by a suitable microphone.
  • the coupling transducers are held in a suitable mechanical arrangement and surrounded by acoustic seals usually formed from rubber or a rubber like substance, and a telephone.handset is mechanically held in contact with the arrangement for transference of acoustic signals.
  • acoustic couplers used for frequenc modulated analog signals such as facsimile or medical telemetry signals perform quite well.
  • da transmission speeds are higher, for example, in the vic of 1200 BPS, and phase modulated and wide band FM signa are used, the limitations of conventional acoustic coup become more apparent. These limitations are caused in by uneven phase, frequency, and amplitude response of t coupler transducers and cavities, as well as acoustic t delays which become appreciable with higher speed and w bandwidth signals.
  • An object of the present invention is to substantially overcome the deficiencies of acoustic cou at high data transmission speeds.
  • a acoustic coupler for transmitting and/or receiving encoded data signals over telephone lines, said acousti coupler including data transmitting and/or receiving elements (20,28) to which a telephone handset (10) is acoustically coupled in audio frequency sound form, and which in use a cavity (32) exists between respective telephone handset transducers and data transmitting and receiving transducers, characterized in that a plug (36 of material is provided in said cavity.
  • Fig. 1 is a diagrammatic partly-sectioned view the essential features of an acoustic coupler, together with a separated telephone handset.
  • the telephone handset 10 is of conventional design, being connected by a cord 12 to a control termi
  • the handset includes a receiving end 14, which includes a microphone, and a transmitting end 16, which includes an acoustic transducer.
  • the duplex acoustic coupler structure 18 includes a transmitting element 20, which has an annular acoustic seal 22, preferably formed from a resilient material such as rubber, which seal is adapted to co-operate with telephone handset receiving end 14 to define, in use, an acoustic cavity 24.
  • a transmit transducer 26 is located within the seal to transmit, in audio frequency form, encoded data to the receiving microphone in receiving end 14.
  • the receive/transmit handset/coupler arrangement 14/20 is not shown with a plug of material in accordance with the invention, for clarity, and because the acoustic coupler problems described herein are not so apparent in this mode.
  • the features of the coupler structure which are not shown may include a flexible central portion to enable the relative angle of the coupler elements to be altered to accommodate various telephone handset types.
  • the coupler 18 also includes a receiving element 28, which has an acoustic seal 30 which is substantially identical, in construction and operation, to seal 20, and forms with end 16, in use, an acoustic cavity 32.
  • a receiver microphone 34 is located within seal 30.
  • a plug 36 is located within seal 30.
  • the plug is preferably formed from resilient semi-open pore material such as a foamed plastics material, although the structure and degree of compressibility may be altered to change operating parameters.
  • the plug is shown in a cylindrical form, with a curved top edge 38.
  • An axial aperture 40 extends through the plug.
  • the plug is preferably formed in a size greater than the expected cavity size, so that in use, when end 16 is located to abut seal 30, the end also deforms plug 36 to fill the entire cavity 32, although leaving aperture 40, in a truncated form.
  • the plug 36 acts as a damping device in the air cavity 32, and as a consequence reduces the resonances within the cavity.
  • the plug also modifies the time delay of sound travelling across the cavity, and reduces the difference in time delay between two or more given frequencies within the bandwidth used. Depending on the degree -of the compressibility of the plug material, the damping effect on the air cavity will vary.
  • the apertured embodiment shown is considered superior in that the aperture 40 provides direct transducer/ transducer communication, through the air, thus not decreasing, sensitivity, whilst maintaining the damping effect by filling the remainder of the cavity 32.
  • plugs of different sizes, shapes, and/ or materials may be fitted with double sided adhesive pads or discs so that they may be added to, removed from, or changed in acoustic coupler air cavities for the purpose of optimising the performance, or equalizing the response, so that the acoustic coupler could be used with, for instance, different types of telephone handsets, or adapt to different line conditions.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)

Abstract

Un coupleur acoustique (18) de transmission et/ou de reception de signaux de donnees codees par des lignes telephoniques auxquelles, en fonctionnement, un ecouteur telephonique (10) est couple acoustiquement. Une cavite (32) est formee entre l'ecouteur (10) et un joint acoustique (30), entourant un transducteur (34). Un tampon (36) de materiau est place dans la cavite(32); en fonctionnement, ce tampon est deforme entre l'ecouteur (10) et le coupleur (18) pour remplir la cavite linearisant ainsi la transmission de donnees sous forme de sons d'audio frequence au travers de la cavite (32). Une ouverture (40) peut etre amenagee dans le tampon pour augmenter la sensibilite.
PCT/AU1980/000057 1979-08-31 1980-09-01 Lineariseur a cavite pour coupleur acoustique WO1981000656A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63929/80A AU6392980A (en) 1979-08-31 1980-09-01 Acoustic coupler cavity lineariser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU286/79 1979-08-31
AUPE028679 1979-08-31

Publications (1)

Publication Number Publication Date
WO1981000656A1 true WO1981000656A1 (fr) 1981-03-05

Family

ID=3768245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1980/000057 WO1981000656A1 (fr) 1979-08-31 1980-09-01 Lineariseur a cavite pour coupleur acoustique

Country Status (2)

Country Link
EP (1) EP0034613A1 (fr)
WO (1) WO1981000656A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6374120B1 (en) * 1999-02-16 2002-04-16 Denso Corporation Acoustic guide for audio transducers
CN107454496A (zh) * 2017-09-18 2017-12-08 歌尔股份有限公司 颈带式蓝牙耳机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2294048A (en) * 1940-11-08 1942-08-25 Provenzano Gaetano Telephone message broadcasting apparatus
US3299207A (en) * 1963-08-29 1967-01-17 Cooke Robert James Sound reproducer with means for attachment to a telephone handpiece
US3360071A (en) * 1965-08-02 1967-12-26 Chromalloy Corp Acoustical coupler
AU858866A (en) * 1986-07-20 1968-01-25 Acoustical coupler
US3553374A (en) * 1969-03-20 1971-01-05 Digitronics Corp Acoustic coupler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2294048A (en) * 1940-11-08 1942-08-25 Provenzano Gaetano Telephone message broadcasting apparatus
US3299207A (en) * 1963-08-29 1967-01-17 Cooke Robert James Sound reproducer with means for attachment to a telephone handpiece
US3360071A (en) * 1965-08-02 1967-12-26 Chromalloy Corp Acoustical coupler
US3553374A (en) * 1969-03-20 1971-01-05 Digitronics Corp Acoustic coupler
AU858866A (en) * 1986-07-20 1968-01-25 Acoustical coupler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6374120B1 (en) * 1999-02-16 2002-04-16 Denso Corporation Acoustic guide for audio transducers
CN107454496A (zh) * 2017-09-18 2017-12-08 歌尔股份有限公司 颈带式蓝牙耳机

Also Published As

Publication number Publication date
EP0034613A1 (fr) 1981-09-02

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