Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1983-05-09
1986-02-04
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 90, 181151, H04R 2700
Patent
active
045690766
ABSTRACT:
A motion picture loudspeaker system is described in which the loudspeaker elements are integral with an acoustical boundary wall such that the characteristics of the vented box woofers are optimized. In order to overcome high reflection problems as sound from the tweeters is reflected by the motion picture screen and the acoustical boundary wall, frequency dependent acoustical absorptive material is attached to the wall to inhibit high frequency reflections with minimal effect on the bass optimization. The system includes the use of a steep slope crossover netowrk having a crossover frequency such that there is a first order match of the woofer and tweeter dispersion at the crossover.
REFERENCES:
patent: 1817630 (1931-08-01), Kroesen
patent: 2426928 (1947-09-01), Gazlay
patent: 3125181 (1964-03-01), Pawlowski
Small, "Vented-Box Loudspeaker Systems; Part I: Small-Signal Analysis", J. Audio Eng. Soc., vol. 21, No. 5, Jun. 1973, pp. 363-372.
Small, "Vented-Box Loudspeaker Systems; Part II: Large-Signal Analysis", J. Aud. Eng. Soc., vol. 21, No. 6, Jul./Aug. 1973, pp. 439-444.
Small, "Vented-Box Loudspeaker Systems; Part III: Synthesis", J. Aud. Eng. Soc., vol. 21, No. 7, Sep. 1973, pp. 549-554.
Small, "Vented-Box Loudspeaker Systems; Part IV: Appendices", J. Aud. Eng. Soc., vol. 21, No. 8, Oct. 1973, pp. 635-639.
James Lansing Sound Inc., data sheet for "Professional Series--Model 2225H/J, 380 mm (15 in) Low Frequency Transducer, Apr. 1981.
J. Lansing Sound, Inc., data sht. for "Professional Series--Bi-Radial Constant Coverage Horns", May 1980.
Murray et al., "Three Dimensional Diaphragm Suspensions for Compression Drivers", J. Aud. Eng. Soc., vol. 28, No. 10, Oct. 1980, pp. 720-725.
Adv. for JBL 2441 compression driver, R-e/p, vol. 12, No. 2, Apr. 1981.
Lipshitz et al., "A Family of Linear Phase Crossover Networks of High Shape Derived by Time Delay", J. Aud. Eng. Soc., vol. 31, No. 1/2, Jan. 1983, pp. 2-20.
Linkwitz, "Active Crossover Networks for Noncoincident Drivers", J. Aud. Eng. Soc., vol. 24, No. 1, Jan./Feb. 1976, pp. 2-8.
Linkwitz, "Loudspeaker System Design", Wireless World, May 1978, pp. 52-56.
Linkwitz, "Loudspeaker System Design-Part 2", Wireless World, Jun. 1978, pp. 67-72.
Wilson, "The Design and Gain Bandwidth Dependence of a Class of Single Amplifier Second-Order All-Pass RC Active Networks", IEEE Transactions on Circuits and Systems, vol. CAS-24, No. 8, Aug. 1977, pp. 446+.
Burton, "Multiple-Amplifier RC-Active Filter Design with Emphasis of GIC Realizations", paper 3-4 in Modern Active Filter Design, IEEE Press, New York, 1981.
"Crossover Filters-An Integral Part of Overall System Engineering", pub. in KEFTOPICS, vol. 4, No. 2, by KEF Electronics Ltd., Maidstone, England, circa 1980.
Frater, "`In-Phase` Crossover Networks", 16th Intl. Radio and Electronic Eng. Convention Digest, Melbourne, Aug. 1977, pp. 250-252.
Thiele, "Optimum Passive Loudspeaker Dividing Networks", Proc. IREE Aust., vol. 36, Jul. 1975, pp. 220-224.
Engebretson et al., "Cinema Sound Reproduction Systems", SMPTE Journal, Nov. 1982, pp. 1046-1057.
Allison, "The Influence of Room Boundaries on Loudspeaker Power Output", J. Audio Eng. Soc., vol. 22, No. 5, Jun. 1974, pp. 314-320.
Thiele, "Loudspeakers in Vented Boxes: Part I, J. Audio Eng. Soc., vol. 19, No. 5, May 1971, pp. 382-392.
Thiele, "Loudspeakers in Vented Boxes: Part II", J. Audio Eng. Soc., vol. 19, No. 6, Jun. 1971, pp. 471-483.
Isen Forester W.
Lucasfilm Ltd.
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