Appeal No. 2000-1888
Application No. 08/885,984
element (V) to obtain various directivity patterns (answer, page
10). The Examiner further equates the varying of the volume
behind the microphone element with configuring the microphone
boot such that only the sounds in a desired direction are picked
up (id.).
Baumhauer discloses a directional microphone that, similar
to the microphone of McAteer, includes a housing with two sound
ports and a microphone element which is unresponsive to sounds
coming from off-axis directions known as nulls (col. 4, lines 24-
26). Baumhauer further teaches that changes made to the spatial
separation (d) between the sound ports, the acoustic resistance
of the element or the volume of the acoustic region behind the
element (V) vary the directivity pattern of the microphone from
cardioid to other known patterns such as super cardioid or
hypercardioid (col. 5, lines 5-17). Baumhauer further describes
the different characteristics associated with each of the
different directivity patterns and how they affect the location
of the nulls, power and front-to-back response ratio of the
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