Noise canceling gradient microphone

Details Noise canceling gradient microphone Noise canceling gradient microphone

H - Electricity

04

M

H04M 1/19 (2006.01) H04M 1/03 (2006.01) H04R 1/38 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2173010

An improved Broadside SOG microphone assembly is realized by employing a microphone assembly having at least three ports arranged in a non-colinear fashion with the at least three ports defining and being in a "gradient" plane and with both outer adjacent differential pair of ports aligned in a direction substantially toward a prospective talker's lips. Thus, the inner port(s) is always closer to the prospective talker's lips. Each outer differential pair of ports forms a dipole which yields a high spatial gradient and, hence, higher speech sensitivity since they are pointed substantially toward the prospective talker's lips. Just as important, as the prospective talker's lip position relative to the microphone varies, this alignment of each outer differential pair of ports will result in the least change in the dipole sensitivity and, therefore, the lowest Broadside SOG microphone position sensitivity. Another advantage of this arrangement is that it similarly has significantly reduced position sensitivity with angular departure from the nominal Broadside prospective talker's lip position, owing again to the orientation of the prospective talker's lips. In a preferred embodiment, a single FOG microphone element is employed which accepts four distinct acoustic signals from acoustic transmission lines from four distinct ports arranged in a non-colinear fashion. The four ports define and are in a "gradient'? plane with both outer adjacent differential pair of ports aligned in a direction substantially toward the prospective talker's lips. Thus, the inner ports are always closer to the prospective talker's lips. Each outer differential pair of ports forms a dipole which yields a high spatial gradient and, hence, higher speech sensitivity since they are pointed in a direction substantially toward the prospective talker's lips. To this end, the outer ports are plus (+) ports and the inner ports are minus (-) ports, or vice versa,. referring to each side of the FOG element's diaphragm.

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