Microphone with low frequency filter
First Claim
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1. A MICROPHONE COMPRISING A CAPACITOR AND A FILTER, SAID CAPACITOR HAVING A FIRST PLATE AND A SECOND PLATE, SAID PLATES BEING SPACED FROM EACH OTHER AND HAVING AN ELECTRICAL CAPACITANCE BETWEEN THEM WHICH VARIES ACCORDING TO THE SPACING BETWEEN SAID PLATES, SAID SPACING BETWEEN SAID PLATES BEING VARIABLE BY EXTERNALLY PRODUCED SOUND WAVES STRIKING SAID FIRST PLATE, SAID FILTER COMPRISING A MEMBRANE SPACED FROM SAID FIRST PLATE FORMING A POCKET THEREBETWEEN, THE POCKET BEING CLOSED, THERE BEING A RESTRICTED FLUID PASSAGEWAY FROM THE POCKET TO ATMOSPHERE SO PROPORTIONED AS TO PERMIT FLOW OF AIR THERETHROUGH IN RESPONSE TO FORCES OF RELATIVELY LOW FREQUENCIES IMPOSED ON THE MEMBRANE, AND TO IMPEDE SAID FLOW IN RESPONSE TO
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1 Claim
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1. A MICROPHONE COMPRISING A CAPACITOR AND A FILTER, SAID CAPACITOR HAVING A FIRST PLATE AND A SECOND PLATE, SAID PLATES BEING SPACED FROM EACH OTHER AND HAVING AN ELECTRICAL CAPACITANCE BETWEEN THEM WHICH VARIES ACCORDING TO THE SPACING BETWEEN SAID PLATES, SAID SPACING BETWEEN SAID PLATES BEING VARIABLE BY EXTERNALLY PRODUCED SOUND WAVES STRIKING SAID FIRST PLATE, SAID FILTER COMPRISING A MEMBRANE SPACED FROM SAID FIRST PLATE FORMING A POCKET THEREBETWEEN, THE POCKET BEING CLOSED, THERE BEING A RESTRICTED FLUID PASSAGEWAY FROM THE POCKET TO ATMOSPHERE SO PROPORTIONED AS TO PERMIT FLOW OF AIR THERETHROUGH IN RESPONSE TO FORCES OF RELATIVELY LOW FREQUENCIES IMPOSED ON THE MEMBRANE, AND TO IMPEDE SAID FLOW IN RESPONSE TO
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Current AssigneeCarl E. Grinstead
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Original AssigneeCarl E. Grinstead
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InventorsGrinstead, Carl E.
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Application NumberUS04/282,050Time in Patent Office1,407 DaysField of SearchUS Class Current381/113CPC Class CodesH04R 19/04 Microphones H04R19/01 takes...
