Capsule-enclosed electro-acoustic transducer and transistor amplifier
阅读：16发布：2022-05-23
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1. AN ELECTRO-ACOUSTIC TRANSDUCER ASSEMBLY COMPRISING, IN COMBINATION, AN ENCASING CAPSULE; AN ANNULAR DISC EXTENDING COMPLETELY ACROSS SAID CAPSULE; A TRANSISTOR AMPLIFIER HAVING ITS COMPONENTS MOUNTED ON SAID DISC; A NOISE COMPENSATING PRESSURE GRADIENT TRANSDUCER DISPOSED SUBSTANTIALLY WITHIN THE CENTER OPENING OF SAID DISC; MEANS PROVIDING A PAIR OF SUBSTANTIALLY EQUAL COUPLING VOLUMES EACH COMMUNICATING WITH RESPECTIVE DIFFERENT FACES OF SAID TRANSDUCER; AND DUCT MEANS COMMUNICATING WITH EACH OF SAID COUPLING VOLUMES AND HAVING AIR OPENINGS LOCATED IN A COMMON PLANE SUBSTANTIALLY PARALLEL TO SAID TRANSDUCER; SAID TRANSDUCER HAVING A SENSITIVITY DECREASING WITH SOUND FREQUENCY FOR SOUND WAVES HAVING A PLANE SOUND FIELD AT THE LOCATION OF SAID TRANSDUCER, AND HAVING A SENSITIVITY VARYING SUBSTANTIALLY WITH SOUND FREQUENCY FOR SOUND WAVES HAVING A SPHERICAL FIELD.
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