DE10345645B4 - Speaker layout - Google Patents

Speaker layout

Info

Publication number
DE10345645B4
DE10345645B4 DE2003145645 DE10345645A DE10345645B4 DE 10345645 B4 DE10345645 B4 DE 10345645B4 DE 2003145645 DE2003145645 DE 2003145645 DE 10345645 A DE10345645 A DE 10345645A DE 10345645 B4 DE10345645 B4 DE 10345645B4
Authority
DE
Germany
Prior art keywords
projection screen
loudspeaker
sound
surface
speaker
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 - Fee Related
Application number
DE2003145645
Other languages
German (de)
Other versions
DE10345645A1 (en
Inventor
Michael Hein
Rolf Janke
Wolfgang John
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.)
ELAC Electroacustic GmbH
Original Assignee
ELAC Electroacustic GmbH
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 ELAC Electroacustic GmbH filed Critical ELAC Electroacustic GmbH
Priority to DE2003145645 priority Critical patent/DE10345645B4/en
Publication of DE10345645A1 publication Critical patent/DE10345645A1/en
Application granted granted Critical
Publication of DE10345645B4 publication Critical patent/DE10345645B4/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/045Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10General applications
    • H04R2499/15Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Abstract

Loudspeaker arrangement with a loudspeaker arranged behind a projection screen, working in DML technology (Distributed Modes Loudspeaker), with a flat diaphragm surface,
characterized in that
- The projection screen is provided with a plurality of the sound passage permitting holes and
- There is a distance between the phase-decorrelated moving membrane surface and the back of the projection screen.

Description

  • The The invention relates to a loudspeaker arrangement with one behind one Projection screen arranged, working in DML technology, provided with a flat membrane surface Speaker.
  • Such a loudspeaker arrangement is known from WO 98/53638 A2. It will continue on the DE 198 21 624 A1 pointed out, from which a projection screen is known, in which at least one Schallabstrahlelement is integrated.
  • It is further known loudspeaker behind a projection screen (for example a movie projection screen). For this purpose, the Projection screen with perforations, usually very fine holes, provided, which allow the passage of sound. The degree of perforation is So the area share the holes based on the total area to avoid the impairment the optical reflection properties low.
  • The through the behind the surface arranged speaker generated sound waves occur in part - as desired - by the perforation through, but on the other hand also on the back the area reflected and to the speaker diaphragm and surrounding it Baffle (the speaker cabinet) thrown back. hereby Due to multiple reflection, a standing wave field arises, which depends on the Distance of the back surface to the baffle and the frequency to significant peaks and dips in the sound pressure transmission behavior and thus noticeable sound discoloration especially in the midrange leads. This also applies in particular to after reflection through the surface passing through sound components.
  • at conventional speakers, so with a sound generation through moving rigid membranes, this effect occurs particularly clearly on, since the individual elemental sound waves, those of innumerable small ones (imaginary) surface elements be generated on the rigid speaker diaphragm, all to each other in phase, so coherent are and thus favor the generation of the standing wave field substantially.
  • Of the Invention is based on the object, a speaker assembly for one Projection screen to create a sound discoloration largely is avoided.
  • According to the invention this Problem solved by the features of the single claim.
  • at DML flat-diaphragm speakers, the sound is wide-angle of a relatively large Surface radiated. The superior surface, that is, the holes provided with the sound passing holes projection screen, does not work as an "obstacle" with such loudspeakers The individual (imaginary) surface elements the flat membrane of such a speaker are over the entire membrane area not in phase, but phase-decorrelated, what the Occurrence of the described standing sound waves largely prevented. The for the DML flat-membrane loudspeaker known very wide-angle radiation - up to the highest to be transferred Frequencies (20,000 Hz) - changes through the perforated surface not worth mentioning, the fundamental one Advantage of DML technology stays for get the room sound.
  • It let yourself such a better sound, namely a uniform Frequency response and a more even sound power distribution achieve less electronic equalization required are. The number and size of perforations can chosen smaller become.
  • Of the Speaker is still much lighter than conventional speakers, which makes mounting behind the perforated surface much less expensive power.

Claims (1)

  1. Loudspeaker arrangement having a loudspeaker arranged behind a projection screen and operating in DML technology (distributed mode Loudspeaker), provided with a flat diaphragm surface, characterized in that - the projection screen is provided with a multiplicity of holes permitting the passage of the sound and - phase decorrelates between it moving diaphragm surface and the back of the projection screen is a distance.
DE2003145645 2003-10-01 2003-10-01 Speaker layout Expired - Fee Related DE10345645B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2003145645 DE10345645B4 (en) 2003-10-01 2003-10-01 Speaker layout

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2003145645 DE10345645B4 (en) 2003-10-01 2003-10-01 Speaker layout

Publications (2)

Publication Number Publication Date
DE10345645A1 DE10345645A1 (en) 2005-05-19
DE10345645B4 true DE10345645B4 (en) 2006-05-18

Family

ID=34441813

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2003145645 Expired - Fee Related DE10345645B4 (en) 2003-10-01 2003-10-01 Speaker layout

Country Status (1)

Country Link
DE (1) DE10345645B4 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053638A2 (en) * 1997-05-17 1998-11-26 New Transducers Limited Acoustic apparatus comprising an array of loudspeakers
DE19821624A1 (en) * 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Projection screen with sound radiating segments
WO2002043437A2 (en) * 2000-11-22 2002-05-30 Technische Universiteit Delft Wave field synthesys sound reproduction system using a distributed mode panel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053638A2 (en) * 1997-05-17 1998-11-26 New Transducers Limited Acoustic apparatus comprising an array of loudspeakers
DE19821624A1 (en) * 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Projection screen with sound radiating segments
WO2002043437A2 (en) * 2000-11-22 2002-05-30 Technische Universiteit Delft Wave field synthesys sound reproduction system using a distributed mode panel

Also Published As

Publication number Publication date
DE10345645A1 (en) 2005-05-19

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee