Noise cancelling microphone

A noise cancelling microphone for use in noisy environments in which a greater proportion of the environmental noise audio sounds received by the microphone emanates from a loud noise source situated at a specific location proximate an operator speaking into the microphone, the noise canceling microphone comprising:

• a microphone housing enclosure having a front portion and a rear portion, said front portion having a plurality of openings therethrough to allow speech audio sounds to enter said enclosure, said front portion situated directly in front of the operator's mouth, the environmental noise audio sounds also entering said openings in said front portion;
• a microphone cartridge situated interiorly to said microphone housing enclosure at a fixed location proximate said front portion openings, said microphone cartridge having a diaphragm with a front audio sound receiving surface and a rear audio sound receiving surface, said microphone cartridge so oriented that said diaphragm front audio sound receiving surface is in a direct line to the mouth of the operator to receive the speech entering said openings of said housing front portion;
• means by which a selected amount of the environmental noise audio sounds emanating from the loud noise source at the specific location may be permitted to enter the rear portion of said microphone housing enclosure, said means including at least one directional opening oriented in the direction of the location of the specifically located loud noise source when the operator is speaking into said openings in said microphone housing front portion;
• and
• means by which the same environmental noise audio sounds are permitted to impinge upon the rear audio sound receiving surface of said diaphragm of said microphone cartridge to cancel the same environmental noise audio sounds impacting the front audio sound receiving surface of said microphone cartridge diaphragm in order that the microphone cartridge transmit only the speech audio sounds.