US 12,207,047 B2
Sound diffusion device with controlled broadband directivity
Christophe Combet, Antony (FR); Christian Heil, London (GB); and Mathias Remy, Les Ulis (FR)
Assigned to L-ACOUSTICS, Marcoussis (FR)
Appl. No. 17/753,615
Filed by L-ACOUSTICS, Marcoussis (FR)
PCT Filed Sep. 3, 2020, PCT No. PCT/EP2020/074620
§ 371(c)(1), (2) Date Oct. 25, 2022,
PCT Pub. No. WO2021/047993, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 1909890 (FR), filed on Sep. 9, 2019.
Prior Publication US 2023/0053097 A1, Feb. 16, 2023
Int. Cl. H04R 1/34 (2006.01); H04R 1/02 (2006.01); H04R 1/24 (2006.01); H04R 1/28 (2006.01); H04R 3/12 (2006.01)
CPC H04R 1/345 (2013.01) [H04R 1/025 (2013.01); H04R 1/24 (2013.01); H04R 1/2826 (2013.01); H04R 3/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An acoustic enclosure (E) having a volume shape with a front face (FEav), a rear face (FEar), two first and second lateral faces (FElat1) and (FElat2), and said enclosure (E) having a main emission direction (Dav) perpendicular to the front face (FEav) of the acoustic enclosure (E) as well as a rear emission direction (Dar) perpendicular to the rear face (FEar) of the acoustic enclosure (E), said acoustic enclosure (E) comprising:
at least one front acoustic source (Sav) configured to emit a sound flux through the front face (FEav) and having a main front source emission direction (DSav), said main front source emission direction being substantially equal to the main emission direction (Dav) of the acoustic enclosure (E),
at least one lateral acoustic source (Slat) oriented towards at least one lateral face with source (FElat), at least one lateral acoustic source (S) oriented towards at least one lateral face with a source (F), the said lateral face with a source (FElat) being one and/or the other of the two first and second lateral faces (FElat1) and (FElat2), the said lateral acoustic source (Slat) having a main lateral source emission direction (DSlat) substantially perpendicular to one and/or the other of the lateral faces (FElat1) and (FElat2),
said front acoustic source (Sav) and said lateral acoustic source (Slat) working in substantially a same frequency range;
at least one waveguide (G) being positioned in front of the at least one lateral acoustic source (S) so as to occlude the sound flux (F) emitted from lateral side acoustic source (Slat) in the main lateral source emission direction (DSlat), and to direct the sound flux (Flat) emitted from said lateral acoustic source to two first and second pluralities of lateral directions on either side of the lateral source emission direction (DSlat), and said waveguide (G) being joined to said lateral face with source (FElat) by upper and lower walls (Gsup, Ginf) of the acoustic enclosure (E),
at least one front orifice (OSLat_av) formed by a space between said lateral face with source (FElat) and said sound waveguide (G) at least one front orifice (OSLat_av) formed by a space between the said lateral face with source (F) and the said sound waveguide (G), so as to allow the sound flow (Flat) emitted by the lateral acoustic source (Slat) to pass in directions pointing towards a hemisphere defined by the main direction of emission (Dav),
at least one rear orifice (OSLat_ar) formed by a space between the said lateral face with source (FElat) and the said sound waveguide (G), so as to allow the sound flow (Flat) emitted by the lateral acoustic source (Slat) to pass in directions pointing towards a hemisphere defined by the rear direction of emission (Dar) of the enclosure,
the walls (Gsup, Ginf) for occluding the sound flux (Flat) reflected by said at least one waveguide (G) in directions other than the directions in which said at least one front orifice (O) and at least one rear orifice (O) let said sound flux (Flat) pass, with the aim of increasing the flux emitted by these orifices to reinforce cardioid directivity.