EP4465657A1 - Richtungslautsprecher - Google Patents

Richtungslautsprecher Download PDF

Info

Publication number
EP4465657A1
EP4465657A1 EP23173508.5A EP23173508A EP4465657A1 EP 4465657 A1 EP4465657 A1 EP 4465657A1 EP 23173508 A EP23173508 A EP 23173508A EP 4465657 A1 EP4465657 A1 EP 4465657A1
Authority
EP
European Patent Office
Prior art keywords
acoustic box
acoustic
waves
directional loudspeaker
mutual coupling
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.)
Pending
Application number
EP23173508.5A
Other languages
English (en)
French (fr)
Inventor
Audrius Balciunas
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.)
Mb Sp Audio
Original Assignee
Mb Sp Audio
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 Mb Sp Audio filed Critical Mb Sp Audio
Priority to EP23173508.5A priority Critical patent/EP4465657A1/de
Publication of EP4465657A1 publication Critical patent/EP4465657A1/de
Pending 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
    • H04R1/32—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
    • H04R1/345—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 for loudspeakers
    • H04R1/347—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 for loudspeakers for obtaining a phase-shift between the front and back acoustic wave
    • 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
    • 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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers

Definitions

  • the present invention relates to a directional loudspeaker, and, in particular, to a directional loudspeaker for use in the mid frequency range of the audio spectrum and a directional loudspeaker system comprising one or more of such directional loudspeakers.
  • Quality acoustic treatment of a room often can and usually does exceed the cost of quality speakers.
  • EP3018915A1 (published on May 5, 2016 ) describes a directional loudspeaker designed for use in the mid frequency range of the audio spectrum. It includes a housing with acoustic resistive material, an acoustic transducer mounted to the front panel, and one or more openings in the side panels and back panel. The resistive material, openings, and reflective back panel delay, attenuate, and shape the back waves in the mid frequency range, creating an attenuation at the backside of the loudspeaker of at least 15dB for midrange frequencies.
  • This solution performs directivity correction only at lower mid-range frequencies and does not have the benefits (directivity and sensitivity) of mutual coupling at mid-higher frequencies.
  • Mid-frequency range plays a crucial part in recreating a sound stage. Below 1000 Hz it's relatively difficult to control the directivity. Conventional speaker in a wide frequency range is not suitable for this, because its directivity changes as the frequency changes. Waveguides are no longer effective in that range; horns must be relatively huge.
  • This invention appertains to passive cardioid.
  • the passive cardioid solutions known to date are used to control the low frequency and lower midrange frequency.
  • directional loudspeaker comprising: an acoustic box;
  • Mutual coupling is a wave summation effect achieved when two or more sources reproduce the same signal, and the acoustic centers of the sources are close together and point in the same direction.
  • This invention appertains as a passive cardioid loudspeaker.
  • This construction of the loudspeaker with cone speaker which front and rear wave phases coincide over the widest possible frequency range from 200 Hz to 2000 Hz and its frequency ROI is as uniform as possible over this range.
  • This invention is special because directivity correction is performed by the principle of mutual coupling of waves, thus not only increasing the directivity but also increasing the sensitivity of the system by up to a factor of two (3db).
  • This invented directional enclosure can be combined with other frequencies directional modules.
  • the openings 4 in the acoustic box are positioned facing the same side as cone speaker 2, so that both the front wave 5 and the rear wave 6 move in the same direction and have a mutual coupling effect.
  • acoustic box with a 160 mm diameter loudspeaker diaphragm (assumed to be ideal).
  • the dimensions of the box are 39,6 cm wide, 50 cm high and 15,4 cm deep, with a wall thickness of 1,8 cm.
  • variations ( Fig. 2 ) of loudspeakers with different constructions of acoustic boxes like: A) with openings in the front near the membrane; B) with openings in the side of the box; C) with openings at the back of the box; and D) closed type.
  • the Fig. 3 graph shows the simulated frequency response of options A, B, C and D ( Fig. 2) at 1 meter on the driver axis.
  • Modification A and B have a higher SPL compared to the frequency response of closed box D.
  • the SPL of modification A is highest over a wide range of frequencies, due to the above mentioned fulfilled conditions of mutual coupling effect.
  • Fig. 4 is a graph of the simulated SPL and phase versus frequency.
  • the mutual coupling effect changes the overall system directivity by summing up waves moving in the same direction.
  • FIG. 5 is simulations of modifications A and D enclosures for horizontal directivity pattern at 600 Hz (left) and 1000 Hz (right).
  • Black - A, Grey - D show that the acoustic box A radiates more forwards than laterally. This results in more directing soundwaves toward the listener and fewer to reflective side surfaces.
  • Fig. 6 is defined vertical directivity index (DI) in decibels in relation to frequencies (Black - A, Grey - D).
  • DI vertical directivity index
  • the vertical plot of the directivity index of the A and D modifications also shows the influence of the coupling effect. Not only is the directivity increased, but the pattern becomes evenly wider over the frequency range and starts narrowing (speaker beaming starts) at higher frequency, thus achieving the goal of having a higher and more even directivity index in as wide a range of frequency as possible.
  • Fig. 7 is shown one of the design solutions of an acoustic box 1, with cone speaker 2 which front wave 5 and reflected rear wave 6 coincide over the widest possible frequency range and whose frequency ROI is as uniform as possible over this range.
  • the correction of the rear wave phase can be varied in several ways, by changing the area of the front openings 4 and by changing the dimensions of the rear chamber 8.
  • the best results were obtained by forming inverted split V-shaped inner wall 7 in the inner 8 part of chamber 1. Inside the box is used a Helmholtz resonator tuned to absorb the rear wave peak of cone speaker 2, by an acoustic filter formed in the rear chamber 3.
  • the advantage of this solution is that is obtained a very directive complex system for the whole audible acoustic frequency spectrum.
  • This invented directional enclosure can be combined with other frequencies directional modules.
  • the invented loudspeaker is combined with other low frequency (LF) dipole module and high frequency compact horn, there is obtained very directive complex system for whole audible acoustic frequency spectrum. This combination leads to significantly more detailed soundstage and better sound resolution when compared to traditional systems.
  • LF low frequency

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP23173508.5A 2023-05-16 2023-05-16 Richtungslautsprecher Pending EP4465657A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23173508.5A EP4465657A1 (de) 2023-05-16 2023-05-16 Richtungslautsprecher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23173508.5A EP4465657A1 (de) 2023-05-16 2023-05-16 Richtungslautsprecher

Publications (1)

Publication Number Publication Date
EP4465657A1 true EP4465657A1 (de) 2024-11-20

Family

ID=86387174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23173508.5A Pending EP4465657A1 (de) 2023-05-16 2023-05-16 Richtungslautsprecher

Country Status (1)

Country Link
EP (1) EP4465657A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12598408B2 (en) * 2023-04-14 2026-04-07 Alps Alpine Co., Ltd. Acoustic apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696886A (en) * 1968-05-03 1972-10-10 James C Armstrong Speaker cabinet enclosure and method of tuning thereof
US3722616A (en) * 1970-12-14 1973-03-27 Ltv Altec Inc Directional loudspeaker system
US5552569A (en) * 1995-03-08 1996-09-03 Sapkowski; Mechislao Exponential multi-ported acoustic enclosure
EP3018915A1 (de) 2014-11-04 2016-05-11 Dutch & Dutch B.V. Richtlautsprecher

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696886A (en) * 1968-05-03 1972-10-10 James C Armstrong Speaker cabinet enclosure and method of tuning thereof
US3722616A (en) * 1970-12-14 1973-03-27 Ltv Altec Inc Directional loudspeaker system
US5552569A (en) * 1995-03-08 1996-09-03 Sapkowski; Mechislao Exponential multi-ported acoustic enclosure
EP3018915A1 (de) 2014-11-04 2016-05-11 Dutch & Dutch B.V. Richtlautsprecher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12598408B2 (en) * 2023-04-14 2026-04-07 Alps Alpine Co., Ltd. Acoustic apparatus

Similar Documents

Publication Publication Date Title
US8428284B2 (en) Loudspeaker with passive low frequency directional control
US6343134B1 (en) Loudspeaker and horn with an additional transducer
US20020150270A1 (en) Sound system having a HF horn coaxially aligned in the mouth of a midrange horn
US20050169493A1 (en) Loudspeaker array system
US7835537B2 (en) Loudspeaker including slotted waveguide for enhanced directivity and associated methods
EP2356824B1 (de) Audiolautsprecheranordnung
US4134471A (en) Narrow angle cylindrical wave full range loudspeaker system
KR20100066826A (ko) 지향성 음향 발생장치 및 방법
EP3058751A1 (de) Antidiffraktions- und phasenkorrekturstruktur für planare magnetische wandler
JPH05268690A (ja) 広角度の指向性を有するスピーカ装置
KR101071963B1 (ko) 지향성이 향상된 음향 재생 장치
US6038326A (en) Loudspeaker and horn with an additional transducer
US20120121118A1 (en) Slotted waveguide for loudspeakers
US20190058954A1 (en) Layered speaker assembly
US11082760B2 (en) Vibration cancelling speaker arrangement
US4437541A (en) Controlled dispersion speaker configuration
US10123111B2 (en) Passive cardioid speaker
EP4465657A1 (de) Richtungslautsprecher
US7426278B2 (en) Sound device provided with a geometric and electronic radiation control
US7577265B2 (en) Loudspeaker system providing improved sound presence and frequency response in mid and high frequency ranges
US20170006379A1 (en) A Sound Diffusion System for Directional Sound Enhancement
US8406445B1 (en) Loudspeaker system with extended constant vertical beamwidth control
JP6824821B2 (ja) スピーカー
KR100320054B1 (ko) 원뿔형반사기/결합기스피커시스템및방법
US8254614B2 (en) Horn speaker with hyperbolic paraboloid lens

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

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

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR

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

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20250510