CHAMBER FOR TESTING ACOUSTICAL TRANSMISSION LOSS CHARACTERISTICS OF SHEET MATERIALS

摘要

-14-ABSTRACTAcoustical transmission loss of sheet materials inthe low frequency range is measured by utilizing acylindrical test chamber containing a speaker directedtowards the upper end to which the sheet material ismounted. Pressure gradient microphones are mounted oneither side of the sheet material and are connected toelectronic circuitry for responsively indicating thetransmission loss measurement across said sheet material.