Generally, loudspeakers are measured in an anechoic chamber. However, those chambers are very expensive, which make sound engineer's easy acoustical measurements almost impossible. Thus the authors devised a new measurement without using any anechoic chamber. Traditionally, loudspeakers are measured in an anechoic chamber by installing in a proper speaker enclosure and by driving with swept sinusoidal signal. Loudspeaker's radiated sound is detected with an omni-directional reference microphone, and the output of the microphone is displayed graphically. If a shot-gun microphone is employed in stead of omni directional microphone, anechoic chamber will become un-necessary. Furthermore, if pulse-train is used as a test signal, noise in surrounding circumstance will be reduced by applying synchronous-averaging algorithm. Based upon this idea the authors measured loudspeaker in any acoustical circumstances, and obtained very similar data with that by the traditional method.
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