Appeal No. 2002-1839 Page 2
Application No. 09/199,751
horn loading is imperfect and frequency dependent "despite the claims of so-called
constant directivity horns." (Id.)
Accordingly, the object of the invention is "to provide a controllable polar
response, so that the output of the system can be tailored to its environment or to [a]
listener's taste." (Appeal Br. at 3.) More specifically, the inventive horn loudspeaker
comprises a horn (22) having a throat (26) and a mouth (30); a primary electroacoustic
driver (24) mounted at or adjacent the throat of the horn and directed along the horn;
and secondary electroacoustic drivers (32T, 32B, 32L, 32R) mounted partway along the
horn and directed thereacross. The secondary drivers are used to change the local
impedance conditions in the horn and, therefore, to change the polar response of the
horn loudspeaker. (Spec. at 15.) Filters (12A, 12E) filter an input signal (34) to
produce a filtered signal for the primary driver of each of the secondary drivers.
According to the appellants, such filters may be designed to increase directivity, to
"flatten the polar response within a specified included radiation angle, or to increase
omnidirectionality." (Id.)
A further understanding of the invention can be achieved by reading the following
claims.
1. A horn loudspeaker, comprising:
a) a horn having a throat and a mouth;
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