Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1979-01-12
1981-02-17
Olms, Douglas W.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181156, 181152, 181154, H04S 100, H04R 102
Patent
active
042516870
ABSTRACT:
A loudspeaker unit having an improved quality of bass reproduction for use in a stereo system with a second unit, which is a mirror image of it, to provide a better three-dimensional feeling on hearing the reproduced sound and to provide an increase in the area of the sound producer or source which includes a bass or woofer loudspeaker housed in a chamber, whose volume, together with the properties of the loudspeaker, is so designed that a desired resonant frequency is produced. An exponential horn is placed at an opening of the chamber, whose design is based on a Helmholtz resonator, whose captive air volume takes over the function of an active diaphragm, and the resonant frequency of the horn resonator has a specific relation to the resonant frequency of the chamber and the loudspeaker. Furthermore, a middle range loudspeaker is placed for radiation upwards at a slope, on a confining wall face of the horn, so that the medium frequency sound waves are reflected at a side wall of the reproduction room are increased. The tweeter loudspeaker, on the other hand, in each unit is turned somewhat towards the middle of the reproduction room, so that it is pointing straight towards the hearer, who will hear the radiated sound, without any loss in the treble output, directly as if it were coming from the original sound producer.
REFERENCES:
patent: 2224919 (1940-12-01), Olson
patent: 2751997 (1956-06-01), Gately
patent: 2835335 (1958-05-01), Glassey
patent: 3047090 (1962-07-01), Pruden
patent: 3627948 (1971-12-01), Nichols
patent: 4006311 (1977-02-01), Carlsson
patent: 4073365 (1978-02-01), Johnson
Lautsprecher-Taschenbush (Loudspeaker Handbook), 1969, Isophon-Werke GmbH, Berlin, pp. 170-187.
"Horn Loud Speaker Design", by J. Dinsdale, Wireless World, Mar., 1974, pp. 19-24.
Hi-Fi Loudspeakers & Enclosures by Cohen, pp. 169, 205, 206, 232-234, 1956.
"Choosing Your Hi-Fi Speaker Enclosure", by Cohen, Radio and Television News, Dec., 1954, pp. 46, 47 & 120.
Isophon Bauanleitung 2, 2 pages.
Loudspeakers by Briggs, pp. 226 & 227, 1958.
Greigg Edwin E.
Olms Douglas W.
LandOfFree
Stereophonic sound reproducing system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stereophonic sound reproducing system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stereophonic sound reproducing system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2263415