EP0129320A1 - Lautsprechergehaüse für Sprachübertragungsstationen - Google Patents

Lautsprechergehaüse für Sprachübertragungsstationen Download PDF

Info

Publication number
EP0129320A1
EP0129320A1 EP84303212A EP84303212A EP0129320A1 EP 0129320 A1 EP0129320 A1 EP 0129320A1 EP 84303212 A EP84303212 A EP 84303212A EP 84303212 A EP84303212 A EP 84303212A EP 0129320 A1 EP0129320 A1 EP 0129320A1
Authority
EP
European Patent Office
Prior art keywords
enclosure
loudspeaker
foam material
peripheral edge
spider
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.)
Granted
Application number
EP84303212A
Other languages
English (en)
French (fr)
Other versions
EP0129320B1 (de
Inventor
Peter Fatovic
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Priority to AT84303212T priority Critical patent/ATE36794T1/de
Publication of EP0129320A1 publication Critical patent/EP0129320A1/de
Application granted granted Critical
Publication of EP0129320B1 publication Critical patent/EP0129320B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
    • H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein

Definitions

  • the present invention relates generally to sound translating devices and more particularly to loudspeaker enclosure arrangements for use in voice communication terminals.
  • a loudspeaker consists of a voice coil or motor unit operating an acoustic conical diaphragm, one side of which acts on an enclosed space known as the loudspeaker enclosure. Since the enclosure provides an acoustical load on the diaphragm, the operating characteristics of a loudspeaker are influenced by the acoustical properties of the enclosure.
  • the loudspeakers are usually mounted on an inside surface of the housing, often in a cramped location, and the entire unit including a variety of electronic circuitry therefore becomes f a haphazard enclosure for the loudspeaker.
  • this type of equipment is meant to'provide only voice communication as opposed to high-fidelity music and since manufacturers find it desirable to minimize the cost and size of their equipment, the loudspeaker employed therein tends to be an inexpensive miniature unit having an acceptable frequency response only in the voice frequency range.
  • an electro-acoustic transducer for use in voice communication terminals adapted to receive voice frequency signals.
  • a small loudspeaker has a voice coil structure and a conical diaphragm supported by a spider having a peripheral edge defining the shape of the loudspeaker.
  • a piece of resilient open cell foam material having a shape complementary similar to that of the loudspeaker has one face provided with a concavity suitable for receiving the spider and the voice coil structure. The edge of the foam material is secured to the peripheral edge of the spider and the outer surface of the foam material is covered with a flexible layer of substantially air-impermeable material thereby providing the loudspeaker with an attached flexible back cavity enclosure.
  • the flexible enclosure is effective to smooth out the frequency response and to remove the low frequency peak due to the resonant frequency of the loudspeaker. This is achieved without unduly affecting the normal low frequency response of the loudspeaker.
  • the invention therefore provides an economical enclosure arrangement for a piece of telecommunication equipment wherein the response peak due to the resonant frequency of the loudspeaker is substantially eliminated and in which the overall frequency response is improved. Since the enclosure is small and flexible, the unit may be fitted in a cramped location of a piece of equipment. In addition, the loudspeaker will operate acceptably even if a portion of the flexible enclosure is deformed slightly against an adjacent component or if the enclosure is shaped to match its mounting space.
  • FIG 1 shows a miniature loudspeaker 10 including a voice coil structure 11, and a spider 12 supporting a conical acoustic diaphragm 13.
  • Such loudspeakers are available as commercial off-the-shelf items and may be circular or rectangular in shape. Common nominal sizes for these loudspeakers are about 21 inches in diameter or 21 inches by 3 inches.
  • a peripheral edge 14 of the spider 12 defines the perimeter and shape of the loudspeaker 10.
  • Shown in cross-section is a piece of flexible foam material 15 having an open cell or air-permeable construction.
  • the foam material has a shape complementary similar to that of the loudspeaker; that is, it is either circular or rectangular and is provided with an opening at its approximate geometrical center as well as a conical depression to allow close-fitting engagement with the voice coil structure 11 and the spider 12.
  • the foam material is thus somewhat donut-shaped.
  • Foam material suitable to realize the invention is commercially available from various manufacturers. Its basic requirements are flexibility, open cell structure and small pore size to provide maximum sound energy absorption in minimum weight and thickness.
  • the outer edge of the foam material is adhesively secured to the peripheral edge 14 of the loudspeaker 10.
  • the joint between the foam material 15 and the spider 12 should preferably be air-impermeable.
  • the outer surface of the foam material 15 is covered by a flexible layer 16 of air-impermeable material which seals the pores of the foam material 15.
  • a flexible layer 16 of air-impermeable material which seals the pores of the foam material 15.
  • Various rubber paints and compounds as well as some varnishes are ideally suited to the task.
  • the sealing material and the foam material must be chemically compatible.
  • silicone rubber compounds have been found to be ideally suited as sealing materials.
  • the volume enclosed by the flexible layer 16 thus becomes the primary enclosure for loudspeaker 10.
  • the efficiency of the enclosure may be increased by closing the circular opening at the center of the foam material 15. This may be achieved by adhesively securing a circular piece of air-impermeable material 17 over the opening.
  • the piece 17 should be of a size adequate to seal the opening and may conveniently be made of ABS (Acrylonitrile-Butadine-Styrene) plastic. Alternately, the opening may be sealed simply with paper, cloth or plastic adhesive tape.
  • a complete enclosure may also be created by using a thicker piece of foam material 15 such that a continuous skin or sealing layer may be obtained.
  • the donut-shaped foam material lends itself to advantageous methods of manufacture as well as resulting in a more compact unit.
  • FIG. 2 is a graphical representation of the improved performance of the transducer of the invention.
  • Waveform 20 represents a nominal frequency response characteristics for a small unmodified loudspeaker mounted in a typical housing of a voice terminal. It is seen that the loudspeaker generates excessive acoustic output from about 200 to 650 hertz as well as a variety of other more minor variations across the voice frequency spectrum. These variations are due partly to the resonant frequency of the loudspeaker and partly to internal housing reflections due to the lack of a proper enclosure for the loudspeaker.
  • Waveform 21 illustrates the smoothing effect provided by the enclosure arrangement of the invention. The resonant frequency effects are cancelled and the effects of housing reflections are substantially minimized without unduly affecting the low frequency response of the speaker.
  • Waveform 22 illustrates the speaker response that might be expected if the primary enclosure was made of rigid material.
  • the undesirable 400 hertz peak is eliminated, but at the expense of mutilating the low frequency response of the speaker.
  • a primary enclosure having a flexible outer layer ensures that there is energy coupling between the primary and secondary enclosures.
  • the amount of coupling varies in accordance with the degree of flexibility of the sealing layer.
  • the amount of coupling may te further increased by providing the sealing layer with one or more breather holes as indicated at 18. Increasing the size of the hole(s) or the flexibility of the sealing layer increases the low frequency response of the transducer.
  • the amount of coupling required is dependent on the loudspeaker characteristics and may be determined with a minimal amount of experimentation.
  • FIG 3 illustrates an enclosure arrangement in accordance with the invention.
  • a typical voice communication terminal comprising a housing 30 which contains a variety of electronic components 31, a CRT 32 and an electro-acoustic transducer 33 having a construction as shown in figure 1.
  • the attached flexible enclosure of transducer 33 provides a primary enclosure which is energy coupled to a secondary enclosure formed by the interior volume of housing 30.
  • the invention provides a loudspeaker having an improved frequency response characteristic. Because of its compact size and its flexible self-contained enclosure, the transducer may be fitted in a constrained location of a communication terminal. The flexible enclosure may be deformed slightly without causing the response of the loudspeaker to be greatly affected. Similarly, if it should be necessary due to space restrictions, it is entirely possible to shape the primary enclosure such as by cutting off a small portion. For example, the volume enclosed within the line A-A (fig. 1) and the outer surface 16 of the enclosure may simply be removed. Of course, the newly exposed surface of foam material 15 would then have to be re-sealed as with silicone rubber.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Telephone Set Structure (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP84303212A 1983-06-16 1984-05-11 Lautsprechergehaüse für Sprachübertragungsstationen Expired EP0129320B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84303212T ATE36794T1 (de) 1983-06-16 1984-05-11 Lautsprechergehauese fuer sprachuebertragungsstationen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000430527A CA1196717A (en) 1983-06-16 1983-06-16 Loudspeaker enclosure arrangement for voice communication terminals
CA430527 1983-06-16

Publications (2)

Publication Number Publication Date
EP0129320A1 true EP0129320A1 (de) 1984-12-27
EP0129320B1 EP0129320B1 (de) 1988-08-24

Family

ID=4125491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84303212A Expired EP0129320B1 (de) 1983-06-16 1984-05-11 Lautsprechergehaüse für Sprachübertragungsstationen

Country Status (5)

Country Link
EP (1) EP0129320B1 (de)
JP (1) JPS6014596A (de)
AT (1) ATE36794T1 (de)
CA (1) CA1196717A (de)
DE (1) DE3473718D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893695A (en) * 1987-06-16 1990-01-16 Matsushita Electric Industrial Co., Ltd. Speaker system
US8767994B2 (en) 2010-11-19 2014-07-01 Apple Inc. Gas filled speaker volume
US8837768B2 (en) 2011-03-28 2014-09-16 Bose Corporation Electro-acoustic transducer enclosure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE673136A (de) *
FR1152433A (fr) * 1956-06-20 1958-02-17 Perfectionnement aux haut-parleurs
GB790998A (en) * 1953-10-23 1958-02-19 Tesla Np A device for the reproduction of sound
US4090582A (en) * 1976-11-02 1978-05-23 Deschu Dennis F Speaker protector
FR2470511A1 (fr) * 1979-11-20 1981-05-29 Faugeras Alain Enceinte acoustique du type " actif - passif " associee a un resonateur
DE2948034A1 (de) * 1979-11-29 1981-06-11 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Elektro-akustischer wandler mit zur verbesserung des frequenzverlaufes vorgesehenen resonanzraeumen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5616876U (de) * 1979-07-16 1981-02-14

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE673136A (de) *
GB790998A (en) * 1953-10-23 1958-02-19 Tesla Np A device for the reproduction of sound
FR1152433A (fr) * 1956-06-20 1958-02-17 Perfectionnement aux haut-parleurs
US4090582A (en) * 1976-11-02 1978-05-23 Deschu Dennis F Speaker protector
FR2470511A1 (fr) * 1979-11-20 1981-05-29 Faugeras Alain Enceinte acoustique du type " actif - passif " associee a un resonateur
DE2948034A1 (de) * 1979-11-29 1981-06-11 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Elektro-akustischer wandler mit zur verbesserung des frequenzverlaufes vorgesehenen resonanzraeumen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893695A (en) * 1987-06-16 1990-01-16 Matsushita Electric Industrial Co., Ltd. Speaker system
AU597496B2 (en) * 1987-06-16 1990-05-31 Matsushita Electric Industrial Co., Ltd. Speaker system
US8767994B2 (en) 2010-11-19 2014-07-01 Apple Inc. Gas filled speaker volume
US8837768B2 (en) 2011-03-28 2014-09-16 Bose Corporation Electro-acoustic transducer enclosure

Also Published As

Publication number Publication date
DE3473718D1 (en) 1988-09-29
EP0129320B1 (de) 1988-08-24
CA1196717A (en) 1985-11-12
ATE36794T1 (de) 1988-09-15
JPS6014596A (ja) 1985-01-25

Similar Documents

Publication Publication Date Title
US4852177A (en) High fidelity earphone and hearing aid
US6134336A (en) Integrated speaker assembly of a portable electronic device
US4506759A (en) Loudspeaker enclosure arrangement for voice communication terminals
GB2200814A (en) Background noise cancelling microphone
CN111836159B (zh) 发声模组
CN208798215U (zh) 发声器件及便携终端
GB1591480A (en) Compression driver for an acoustical horn speaker and a speaker having such a driver
CN208285531U (zh) 发声器
JPS62120193A (ja) ヘツドホンのための耳当てクツシヨン
GB2235852A (en) Transducer having two or more ducts
US3164221A (en) Low frequency loudspeaker system
WO2023050984A1 (zh) 一种耳机
CN1242645C (zh) 声音发生器
JPH0549142B2 (de)
CN216414548U (zh) 圈铁喇叭组件及耳机
US4511768A (en) Mounting arrangement for altering a microphone's frequency response
CA1196083A (en) Anti-side tone transmitter
GB2064265A (en) Microphone unit
WO2022105101A1 (en) Microphone integrted with loudspeaker
EP0129320B1 (de) Lautsprechergehaüse für Sprachübertragungsstationen
CN210609588U (zh) 发声装置和电子设备
US7035420B2 (en) Microphone gasket with integrated acoustic resistance
CN208638631U (zh) 扬声器
JPH02170795A (ja) パネル型スピーカ
CN216414550U (zh) 一种耳机

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT DE FR GB NL SE

17P Request for examination filed

Effective date: 19850312

17Q First examination report despatched

Effective date: 19861103

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB NL SE

REF Corresponds to:

Ref document number: 36794

Country of ref document: AT

Date of ref document: 19880915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3473718

Country of ref document: DE

Date of ref document: 19880929

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19900511

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19900515

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19900531

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19900629

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19910511

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19910512

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19911201

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19920303

EUG Se: european patent has lapsed

Ref document number: 84303212.9

Effective date: 19911209

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19990511

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19990512

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000511

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20000511

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010131

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST