Acoustical transducer enclosure

Details Acoustical transducer enclosure Acoustical transducer enclosure

1995-07-19

1997-08-19

Eldred, J. Woodrow

Acoustics

Miscellaneous

181144, 181148, 181184, 181189, 181199, 381 88, 381 90, 381155, 381159, H05K 500, H04R 102

Patent

active

056591551

ABSTRACT:
The purpose of the invention is to direct, in a coherent fashion, audible frequencies, particularly, low frequencies and especially those below 90 cycles. The advantage to directing low frequencies to acute projection patterns previously thought impossible is to reduce low frequency feedback in live performance applications and to reduce low frequency room reverberation in all applications which results in a faster decay time of the low frequency produced. Acute directivity of low frequencies is achieved by using a rectangular enclosure in the vertical axis and by placing a rectangular port on the horizontal axis centrally located between two transducers. The three-point projection pattern is established so that the three points of projection can act to set up a carrier wave and side band waves effect. Alternatively, one transducer can be centrally located between two rectangular ports.

REFERENCES:
patent: 4169516 (1979-10-01), Honda
patent: 4201274 (1980-05-01), Carlton
patent: 4805729 (1989-02-01), Wascom
patent: 5012889 (1991-05-01), Rodgers
patent: 5111905 (1992-05-01), Rodgers
patent: 5115473 (1992-05-01), Yamagishi et al.

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