Constant coverage horn
An example apparatus may include one or more of a throat that includes an opening that receives sound, a bell that directs the sound, a mouth opening that outputs the sound, and a variable-width slot disposed between the throat and the bell which directs the sound, wherein the variable-width slot may include a lower portion with a first width and an upper portion with a second width which is greater than the first width.
1 . A horn comprising:
a throat comprising an opening that receives sound;
a bell that directs the sound;
a mouth opening that outputs the sound; and
a variable-width slot disposed between the throat and the bell which directs the sound, wherein the variable-width slot comprises a lower portion with a first width and an upper portion with a second width which is greater than the first width,
wherein the lower portion of the variable-width slot is associated with a lower vertical coverage region of the horn and the upper portion of the variable-width slot is associated with an upper vertical coverage region of the horn.
2 . The horn of claim 1 , wherein the variable-width slot comprises a curved shape from the lower portion to the upper portion.
3 . The horn of claim 1 , wherein the variable-width slot comprises a V shape.
4 . The horn of claim 1 , wherein the variable-width slot comprises a pie-piece shape.
5 . The horn of claim 1 , wherein the variable-width slot comprises a lower acoustic resistance in the upper portion in comparison to the lower portion.
6 . The horn of claim 1 , wherein the mouth comprises a rectangular opening comprising an upper portion that has a first width, a bottom portion that has a second width, and sides between the upper portion and the bottom portion which include a vertical height, wherein the vertical height is greater than the first width and the second width.
7 . The horn of claim 1 , wherein the mouth comprises a rectangular opening comprising an upper portion that has a first width, a bottom portion that has a second width, and sides between the upper portion and the bottom portion which include a vertical height, wherein the vertical height is less than the first width and the second width.
8 . The horn of claim 1 , wherein the mouth comprises a square opening comprising an upper portion that has a first width, a bottom portion that has a second width, and sides between the upper portion and the bottom portion which include a vertical height, wherein the vertical height is equal to the first width and the second width.
9 . The horn of claim 1 , wherein a horizontal coverage area of the horn is dependent on the relative location of said horizontal coverage within the range of the vertical coverage area of the horn.
10 . A loudspeaker comprising:
a throat comprising an opening that receives sound;
a bell that directs the sound;
a mouth opening that outputs the sound;
a sound source positioned behind the opening of the throat which is configured to output the sound towards the opening of the throat; and
a variable-width slot disposed between the throat and the bell which directs the sound, wherein the variable-width slot comprising a lower portion with a first width and an upper portion with a second width which is greater than the first width,
wherein the lower portion of the variable-width slot is associated with a lower vertical coverage region of the horn and the upper portion of the variable-width slot is associated with an upper vertical coverage region of the horn.
11 . The loudspeaker of claim 10 , wherein the variable-width slot comprises a curved shape from the lower portion to the upper portion.
12 . The loudspeaker of claim 10 , wherein the variable-width slot comprises a V shape.
13 . The loudspeaker of claim 10 , wherein the variable-width slot comprises a pie-piece shape.
14 . The loudspeaker of claim 10 , wherein the variable-width slot comprises a lower acoustic resistance in the upper portion in comparison to the lower portion.
15 . The loudspeaker of claim 10 , wherein the mouth comprises a rectangular opening comprising an upper portion that has a first width, a bottom portion that has a second width, and sides between the upper portion and the bottom portion which include a vertical height, wherein the vertical height is greater than the first width and the second width.
16 . The loudspeaker of claim 10 , wherein the mouth comprises a rectangular opening comprising an upper portion that has a first width, a bottom portion that has a second width, and sides between the upper portion and the bottom portion which include a vertical height, wherein the vertical height is less than the first width and the second width.
17 . The loudspeaker of claim 10 , wherein the mouth comprises a square opening comprising an upper portion that has a first width, a bottom portion that has a second width, and sides between the upper portion and the bottom portion which include a vertical height, wherein the vertical height is equal to the first width and the second width.
18 . The loudspeaker of claim 10 , wherein a horizontal coverage area of the loudspeaker is dependent on the relative location of said horizontal coverage within the range of the vertical coverage area of the horn.
19 . The horn of claim 1 , wherein the variable-width slot is configured such that the upper portion presents lower acoustic resistance to sound propagation than the lower portion, thereby directing a greater portion of sound energy toward an upper vertical coverage region with respect to a lower vertical coverage region of the horn.