Claims
- 1. A sound recording arrangement comprising:
a plurality of at least three microphones situated nominally on a common plane, at points nominally on a circle having a diameter that corresponds to a sound time-of-arrival difference of approximately 0.9 msec between a pair of microphones that is diametrically situated from each other; and means for communicating signals of said microphones to other equipment where no microphones connected to said means that are nominally on said common plane are on other than said circle.
- 2. The arrangement of claim 1 where said means is output ports, recording apparatus, or a signal transmission apparatus.
- 3. The arrangement of claim 1 where said microphones are directional.
- 4. The arrangement of claim 1 further comprising at least one additional microphone having its direction of maximum sensitivity at a substantial angle from said plane.
- 5. The arrangement of claim 4 where said one additional microphone is situated on surface of a sphere that includes said circle.
- 6. The arrangement of claim 1 where no microphones connected to said means are situated at effective positions in space that lie outside a surface that nominally is a sphere.
- 7. The arrangement of claim 6 where said sphere has a diameter that corresponds to a time of sound travel of approximately 0.9 msec.
- 8. The arrangement of claim 1 where said N plurality of microphones is arranged along said circle to be substantially symmetrical about a mid-line that traverses said circle in said common plane and passes a center point of said circuit, and substantially asymmetrical about a diameter of said circle that is perpendicular to said mid-line.
- 9. The arrangement of claim 1 where said plurality of at least three microphones comprises an odd number of microphones that point to directions that lie substantially on a horizontal plane.
- 10. The arrangement of claim 1 where said a plurality of at least three microphones comprises a plurality of at least three microphones that point at directions substantially on a horizontal plane, one additional microphone that points at a direction that is substantially perpendicular and upward from said horizontal plane, and another additional microphone that points at a direction that is substantially perpendicular and downward from said horizontal plane.
- 11. A sound recording arrangement comprising:
an N plurality of directional microphones, when N is equal to or greater than 3, situated nominally on a common plane, at points nominally on a circle having a diameter that corresponds to a sound time-of-arrival difference of approximately 0.9 msec between a pair of said directional microphones that is diametrically situated from each other, where said plurality of directional microphones, as a group, are more sensitive to sound arriving from a front direction of said arrangement than from any other direction.; and means for communicating signals of said microphones to other equipment.
- 12. The arrangement of claim 8 where said plurality of microphones includes a microphone whose direction of maximum sensitivity point substantially bisects an angle formed by to directions lying on a horizontal plane points to a front direction.
- 13. The arrangement of claim 12 where others of said microphones that point to directions lying on a horizontal plane are paired up, and each pair j is pointed to directions ±αi, where αi≠aj when i≠j.
- 14. The arrangement of claim 13 where sensitivity of a microphone that points at direction αl has a sensitivity at direction αl±1 that is down 3 db from said sensitivity at direction αl, and said sensitivity of a microphone that points at direction αl has a sensitivity at direction αl±2 that is more than 40 db down from said sensitivity at direction αl.
- 15. The arrangement of claim 10 further comprising a storage medium coupled to said means for communicating signals of said microphones to other equipment, for storing in a separate area the signals of each of said plurality of microphones.
- 16. The arrangement of claim 10 further comprising a processor for combining selected ones of said signals of said plurality of at least three microphones.
RELATED APPLICATION
[0001] This is a continuation of U.S. patent application Ser. No. 09/713,187, filed Nov. 15, 2000. This invention claim priority from provisional application No. 60/172,967, filed Dec. 21, 1999.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60172967 |
Dec 1999 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09713187 |
Nov 2000 |
US |
Child |
10892075 |
Jul 2004 |
US |