US 11,889,263 B2Granted

Space shaded constant beamwidth transducer

OwnerPaul Sonifrankinventor

Life of this patent

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Abstract

A loudspeaker described herein have a radiation pattern which is constant over a wide frequency range without requiring any attenuation. The system includes plurality of drivers not uniformly arranged so that the relative velocity of the speaker follows the Legendre shading function. By making the driver density proportional to the Legendre function SSCBT allows each driver to play at max volume. The purpose behind Space Shaded Constant Beamwidth Transducer (SSCBT) is to replace attenuation with incremental spacing between the drivers. Alternatively, the angles each driver is placed by doubling the distance each driver is placed to accomplish the region which is 3 db lower. When the distance is doubled, the angle between each driver increases the further from 0 it is and is consistent with the Legendre function on its surface.

Claims3

Dependent claims

The Space Shaded Constant-Beamwidth Transducer (SSCBT) system comprising:

plurality of drivers arranged so that a radial velocity distribution of an array they form follows a Legendre shading function,
wherein a driver density is proportional to the Legendre shading function,
wherein in SSCBT system an attenuation is not required, and the attenuation is replaced with incremental spacing between the drivers, where spacing can be implemented to achieve more accurate representations of the Legendre function
wherein the number of drivers over a certain angular region is proportional to the velocity of that region which is equal to the Legendre function
n
Δ
⁢
θ
∼
μ
⁡
(
θ
)
=
ρ
v
(
cos
⁢
(
θ
)
)
wherein
n
Δ
⁢
θ
is the driver density
where n is the number of drivers
over a range of angles angle Δθ
μ(θ) is the radial velocity distribution
ρv(cos(θ)) is the Legendre function of argument x and order v where v>0,
wherein the number of drivers in a given area x1 through x2 is considered to be the average driver density in that area and is equal to the average velocity in that region
n
·
g
(
x
2
-
x
1
)
=
Avg
⁡
(
μ
⁡
(
x
)
)
=
1
(
x
2
-
x
1
)
⁢
∫
x
1
x
2
μ
⁡
(
x
)
⁢
dx
wherein n is the number of driver,
g is the equalizing constant, wherein g is dependent on the total size and total number of drivers of the system,
x1 through x2 are the regions over that area is considered the average driver density in that area,
μ(x) is the velocity.

78 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/404,981Filed 17 Aug 2021 · us provisional application
Priority: 19 Aug 2020
Published: US 2022/0060817 A124 Feb 2022
Granted: 30 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04R 1/403
By combining a number of identical transducers: loud-speakers
H04R 1/227
For obtaining desired frequency characteristic only: using transducers reproducing the same frequency band
H04R 3/12
Circuits for transducers: for distributing signals to two or more loudspeakers
H04R 2201/405
Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but…:…