Testing microphones

Claim 1

AN APPARATUS FOR USE IN TESTING A CLOSE TALKING MICROPHONE COMPRISING A SOURCE OF SWEPT AUDIO FREQUENCY SINUSOIDAL POWER OF CONTROLLABLE AMPLITUDE, AN ELEMENT ENERGIZABLE BY SAID SOURCE FOR RADIATING INTO THE ATMOSPHERE SWEPT-FREQUENCY SUBSTANTIALLY SINUSOIDAL ACOUSTIC WAVE ENERGY IN A SPATIAL SOUND DISTRIBUTION IN THE IMMEDIATE VICINITY THEREOF SIMULATING THAT IN THE IMMEDIATE VICINITY OF A HUMAN MOUTH WHEN SPEAKING, SAID RADIATING ELEMENT INCLUDING A SUBSTANTIALLY HEMISPHERICAL DISHSHAPED MEMBER HAVING A CENTRAL OPENING THROUGH THE WALL THEREOF FOR PASSING SAID ACOUSTIC WAVE ENERGY, ACOUSTIC SENSING MEANS HAVING SUBSTANTIALLY LINEAR RESPONSE IN THE AUDIO BAND FOR CONTINUOUSLY MONITORING THE AMPLITUDE OF THE ACOUSTIC WAVE ENERGY AT A POSITION CONTIGUOUS WITH THE OPENING IN SAID HEMISPHERICAL MEMBER AND IN THE DIRECT RADIATION FIELD OF SAID ELEMENT, MEANS COUPLED TO SAID ACOUSTIC SENSING MEANS AND TO SAID SOURCE OF POWER TO MAINTAIN THE AMPLITUDE OF THE ACOUSTIC WAVE ENERGY AT SAID POSITION SUBSTANTIALLY CONSTANT OVER SAID FREQUENCY BAND, AND MEANS FOR SUPPORTING A CLOSE-TALKING MICROPHONE TO BE TESTED PROXIMATE TO THE CONVEX SIDE OF SAID HEMISPHERE AND APPROXIMATELY IN LINE WITH SAID OPENING TO APPROXIMATE USE BY A HUMAN BEING.

Claim 2

AN APPARATUS FOR USE IN TESTING A CLOSE TALKING MICROPHONE COMPRISING A SOURCE OF SWEPT AUDIO FREQUENCY SINUSOIDAL POWER OF CONTROLLABLE AMPLITUDE, AN ELEMENT ENERGIZABLE BY SAID SOURCE FOR RADIATING INTO THE ATMOSPHERE SWEPT-FREQUENCY SUBSTANTIALLY SINUSOIDAL ACOUSTIC WAVE ENERGY IN A SPATIAL SOUND DISTRIBUTION IN THE IMMEDIATE VICINITY THEREOF SIMULATING THAT IN THE IMMEDIATE VICINITY OF A HUMAN MOUTH WHEN SPEAKING, SAID RADIATING ELEMENT INCLUDING A SUBSTANTIALLY HEMISPHERICAL DISHSHAPED MEMBER HAVING A CENTRAL OPENING THROUGH THE WALL THEREOF FOR PASSING SAID ACOUSTIC WAVE ENERGY, ACOUSTIC SENSING MEANS HAVING SUBSTANTIALLY LINEAR RESPONSE IN THE AUDIO BAND FOR CONTINUOUSLY MONITORING THE AMPLITUDE OF THE ACOUSTIC WAVE ENERGY AT A POSITION CONTIGUOUS WITH THE OPENING IN SAID HEMISPHERICAL MEMBER AND IN THE DIRECT RADIATION FIELD OF SAID ELEMENT, MEANS COUPLED TO SAID ACOUSTIC SENSING MEANS AND TO SAID SOURCE OF POWER TO MAINTAIN THE AMPLITUDE OF THE ACOUSTIC WAVE ENERGY AT SAID POSITION SUBSTANTIALLY CONSTANT OVER SAID FREQUENCY BAND, AND MEANS FOR SUPPORTING A CLOSE-TALKING MICROPHONE TO BE TESTED PROXIMATE TO THE CONVEX SIDE OF SAID HEMISPHERE AND APPROXIMATELY IN LINE WITH SAID OPENING TO APPROXIMATE USE BY A HUMAN BEING.