Electrical audio signal processing systems and devices – Lecterns
Patent
1990-04-11
1992-05-19
Isen, Forester W.
Electrical audio signal processing systems and devices
Lecterns
381 83, 381155, 381188, 381205, H04R 2700
Patent
active
051154706
ABSTRACT:
For improved sound reinforcement, especially of the human voice, in situations where clarity and full audience coverage are important, an integrated structure supports a microphone and a speaker unit in an anti-feedback spatial relationship. The single speaker unit, mounted in an elevated position facing the audience, acts as a well-localized "point source", the microphone being located nearby in a working location to the rear of speaker. Despite this proximity, acoustic feedback and resultant "howl" tendencies are suppressed by providing both the microphone and the speaker unit with hypercardioid directivity and locating them in an offset back-to-back relationship such that alignment of their "null" regions combines their attenuation, minimizing feedback. In one embodiment, a lectern table supports the microphone in a working position and mounts an offset vertical pole carrying the speaker unit. The system amplifier may be housed within the lectern table. In an alternative floor stand embodiment a folding tripod base mounts a vertical pole carrying the speaker on top and supporting the microphone at a working height. In the speaker enclosure, a rear aperture provides hypercardioid directivity, while a front diffraction slot enhances the high frequency dispersion in a horizontal plane.
REFERENCES:
patent: 1890742 (1932-12-01), Messmer
patent: 3370125 (1968-02-01), Shaw et al.
patent: 3443031 (1969-05-01), Bolick, Jr.
patent: 3536862 (1970-10-01), Weingartner
patent: 3722616 (1973-05-01), Beavers
patent: 3992586 (1976-11-01), Jaffe
Chen Sylvia
Isen Forester W.
McTaggart J. E.
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