WO2021176240A3 - Second-order gradient loudspeaker system, as well as second-order gradient line array speaker and plane wave speaker constructed from such loudspeaker systems - Google Patents

Second-order gradient loudspeaker system, as well as second-order gradient line array speaker and plane wave speaker constructed from such loudspeaker systems Download PDF

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Publication number
WO2021176240A3
WO2021176240A3 PCT/HU2019/050047 HU2019050047W WO2021176240A3 WO 2021176240 A3 WO2021176240 A3 WO 2021176240A3 HU 2019050047 W HU2019050047 W HU 2019050047W WO 2021176240 A3 WO2021176240 A3 WO 2021176240A3
Authority
WO
WIPO (PCT)
Prior art keywords
order gradient
loudspeaker
acoustic
systems
passive
Prior art date
Application number
PCT/HU2019/050047
Other languages
French (fr)
Other versions
WO2021176240A2 (en
Inventor
Géza Zsolt BALOGH
András CSEREPES
Géza BALOGH
Balázs Géza MAGOS
Original Assignee
Interton Elektroakusztikai Kft.
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 Interton Elektroakusztikai Kft. filed Critical Interton Elektroakusztikai Kft.
Priority to EP19958748.6A priority Critical patent/EP4049460A2/en
Publication of WO2021176240A2 publication Critical patent/WO2021176240A2/en
Publication of WO2021176240A3 publication Critical patent/WO2021176240A3/en

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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
    • 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
    • H04R1/32—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
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • 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 
    • 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
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
    • 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • General Health & Medical Sciences (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

The present invention relates to a second-order gradient loudspeaker system comprising two first-order gradient loudspeaker systems (1, 2) with loudspeaker (LS1, LS2) arranged at a distance d from one another, said two first-order gradient loudspeaker systems (1, 2) are located substantially one behind the other and a cavity of width h is present therebetween, the cavity has a volume with an acoustic capacity CK. The first-order gradient loudspeaker systems (1, 2) according to the invention are of passive design, that is, each of said systems (1, 2) is formed as an acoustic network consisting of passive acoustic elements having at least one of a passive acoustic mass (M), acoustic resistance (R) and acoustic capacity (C). Said acoustic network comprises at least one phase rotating member capable of passive gradient generation, wherein said first-order gradient loudspeaker systems (1, 2) are driven by modified audio frequency electrical signals directly or through at least one element selected from the group consisting of all-pass filters (APF), low-pass filters (LPF) and delay circuits (τ) in such a way that the rear first-order gradient loudspeaker system (2) is in reversed phase compared to the front first-order gradient loudspeaker (1), and the driving electrical signal of the rear system (2) is delayed by a total delay time τ compared to the driving electrical signal of the front system (1), the total delay time τ is given by Formula (I) wherein c is the sound propagation velocity in air at a given temperature; and α is a factor that defines the required type of the polar pattern of the second-order gradient loudspeaker system within a range extending from cardioid to „8"-shaped, or bidirectional.
PCT/HU2019/050047 2019-10-27 2019-10-29 Second-order gradient loudspeaker system, as well as second-order gradient line array speaker and plane wave speaker constructed from such loudspeaker systems WO2021176240A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19958748.6A EP4049460A2 (en) 2019-10-27 2019-10-29 Second-order gradient loudspeaker system, as well as second-order gradient line array speaker and plane wave speaker constructed from such loudspeaker systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HUP1900369 2019-10-27
HU1900369A HUP1900369A1 (en) 2019-10-27 2019-10-27 Second order gradient speaker further second order gradient line speaker and surface speaker built from said speakers

Publications (2)

Publication Number Publication Date
WO2021176240A2 WO2021176240A2 (en) 2021-09-10
WO2021176240A3 true WO2021176240A3 (en) 2021-12-16

Family

ID=89993001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HU2019/050047 WO2021176240A2 (en) 2019-10-27 2019-10-29 Second-order gradient loudspeaker system, as well as second-order gradient line array speaker and plane wave speaker constructed from such loudspeaker systems

Country Status (3)

Country Link
EP (1) EP4049460A2 (en)
HU (1) HUP1900369A1 (en)
WO (1) WO2021176240A2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283848A (en) * 1965-10-21 1966-11-08 Patti Thomas Allan Sound reproduction system
SU1184110A1 (en) * 1981-03-17 1985-10-07 Vnii Radiovesh Priema Akustiki Acoustic radiator
US5870484A (en) * 1995-09-05 1999-02-09 Greenberger; Hal Loudspeaker array with signal dependent radiation pattern
US7813516B1 (en) * 2006-07-24 2010-10-12 Graber Curtis E System for cardioid sound field generation from dissimilar sources
WO2017210605A1 (en) * 2016-06-03 2017-12-07 Fulcrum Acoustic, LLC Passive cardioid speaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283848A (en) * 1965-10-21 1966-11-08 Patti Thomas Allan Sound reproduction system
SU1184110A1 (en) * 1981-03-17 1985-10-07 Vnii Radiovesh Priema Akustiki Acoustic radiator
US5870484A (en) * 1995-09-05 1999-02-09 Greenberger; Hal Loudspeaker array with signal dependent radiation pattern
US7813516B1 (en) * 2006-07-24 2010-10-12 Graber Curtis E System for cardioid sound field generation from dissimilar sources
WO2017210605A1 (en) * 2016-06-03 2017-12-07 Fulcrum Acoustic, LLC Passive cardioid speaker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OLSON M F: "GRADIENT LOUDSPEAKERS", JOURNAL OF THE AUDIO ENGINEERING SOCIETY, AUDIO ENGINEERING SOCIETY, NEW YORK, NY, US, vol. 21, no. 2, 1 March 1973 (1973-03-01), pages 86 - 93, XP000763042, ISSN: 1549-4950 *

Also Published As

Publication number Publication date
EP4049460A2 (en) 2022-08-31
WO2021176240A2 (en) 2021-09-10
HUP1900369A1 (en) 2021-05-28

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