Claims
- 1. A horn apparatus, comprising:
a horn having a bell and an entrance slot; a higher frequency source; a lower frequency source; a higher frequency throat connecting the higher frequency source to the entrance slot of the horn; a lower frequency throat connecting the lower frequency source to the entrance slot of the horn; and an acoustic filter interposed between the higher frequency throat and the lower frequency throat, upstream of the entrance slot of the horn.
- 2. The apparatus of claim 1, wherein the acoustic filter comprises an acoustic crossover.
- 3. The apparatus of claim 2, wherein the higher and lower frequency throats have different exponential flare rates.
- 4. The apparatus of claim 1, wherein the higher and lower frequency throats have different exponential flare rates.
- 5. The apparatus of claim 1, wherein the acoustic filter is a low pass filter.
- 6. The apparatus of claim 1, wherein the acoustic filter includes a perforated plate extending across the lower frequency throat.
- 7. The apparatus of claim 1, further comprising:
a second lower frequency source; a second lower frequency throat connecting the second lower frequency source to the entrance slot of the horn; and a second acoustic filter interposed between the second lower frequency throat and the higher frequency throat.
- 8. The apparatus of claim 7, wherein the first and second acoustic filters are on opposite sides of the higher frequency throat.
- 9. The apparatus of claim 1, wherein the acoustic filter comprises two spaced perforated plates extending across the lower frequency throat.
- 10. The apparatus of claim 1, wherein the acoustic filter is positioned to establish a first effective entrance slot for the higher frequency and a second effective entrance slot for the lower frequency, wherein the first effective entrance slot is narrower than the second effective entrance slot.
- 11. The apparatus of claim 10, wherein widths of the first effective entrance slot and second effective entrance slots are proportional to the wave length of the frequency traversing each slot.
- 12. The apparatus of claim 1, wherein the acoustic filter includes a bent perforated plate having an extension merging into the bell of the horn.
- 13. The apparatus of claim 1, wherein each frequency has a substantially identical dispersion pattern from the horn.
- 14. The apparatus of claim 1, wherein the higher frequency throat and the lower frequency throat are positioned so that the higher frequency source and the lower frequency source have the same effective delay.
- 15. A horn assembly, comprising:
a horn having a contoured expansion and an entrance opening; a higher frequency source; a lower frequency source; a higher frequency throat connecting the higher frequency source to the entrance opening of the horn; a lower frequency throat connecting the lower frequency source to the entrance opening of the horn; and a perforated guide interposed between the higher frequency throat and the lower frequency throat, upstream of the entrance opening of the horn.
- 16. The assembly of claim 15, wherein the perforated guide includes openings sized to allow the lower frequency to traverse the perforated guide.
- 17. The assembly of claim 15, wherein the perforated guide directs the higher frequency into the horn.
- 18. The assembly of claim 15, wherein the perforated guide includes an extension shaped to merge into the contoured expansion of the horn.
- 19. A horn assembly, comprising:
a horn having a contoured expansion and an entrance opening; a higher frequency source; a first passage connecting the higher frequency source to the entrance opening of the horn; a first lower frequency source a first lower frequency passage connecting the first lower frequency source to the entrance opening of the horn; a second lower frequency source; a second lower frequency passage connecting the second lower frequency source to the entrance opening of the horn; a first perforated guide interposed between the higher frequency passage and the first lower frequency throat, upstream of the entrance opening of the horn; and a second perforated guide interposed between the higher frequency passage and the second lower frequency passage, upstream of the entrance opening of the horn, wherein the first and second perforated guides are positioned on opposite sides of the higher frequency passage.
- 20. The assembly of claim 19, wherein the first and second perforated guides include extensions that blend into the contoured expansion of the horn.
- 21 An acoustic filter positioned between a higher frequency source and a lower frequency source to provide a smooth combination of higher frequency acoustical energy and lower frequency acoustical energy at the entrance of a horn.
- 22. The acoustic filter of claim 21, further including perforated surfaces sized to allow the lower frequency to traverse the acoustic filter.
- 23. The acoustic filter of claim 23, wherein the perforated surfaces are positioned to guide the higher frequency into the entrance of the horn.
- 24. The acoustic filter of claim 21, wherein the acoustic filter is acoustically attached to the horn, the higher frequency sound source, and the lower frequency sound source.
- 25. The acoustic filter of claim 21, wherein each frequency has nearly an identical dispersion pattern from the horn.
- 26. The apparatus of claim 21, wherein the acoustic filter is positioned so that the higher frequency source and the lower frequency source have the same effective delay.
APPLICATION FOR UNITED STATES LETTERS PATENT
[0001] This application claims the benefit of co-pending U.S. Provisional Patent Application Serial No.60/369,423 filed Apr. 02, 2002, entitled “Dual Range Horn with Acoustic Crossover”, which is hereby incorporated by reference.
[0002] A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark office patent file or records, but otherwise reserves all copyright rights whatsoever.
[0003] Be it known that I, Marshall D. Buck, a citizen of the United States, residing in Los Angeles, Calif. have invented a new and useful “Dual Range Horn With Acoustic Crossover.”
Provisional Applications (1)
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Number |
Date |
Country |
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60369423 |
Apr 2002 |
US |