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차일환,박규태,임광호 한국음향학회 1983 韓國音響學會誌 Vol.2 No.1
An irregulary formed chamber was designed and constructed to recognize the direct sound radiated from the sound source and the reflected sound from the walls of the chamber. The sound signal used was tone burst in the frequency response characteristics with the signal detection after transient effect. The direct wave, transient phenomena and the primary reflected sound could be asiily distinguished each other by measurements of the arrival time of the time difference. And also noise could be easily distinguished by the same method. The result obtained can be used in industries for automatic measurement of the sound pressure reponse characteristics with respect to frequencies.
차일환 연세대학교 산업기술연구소 1978 논문집 Vol.8 No.1
The sound transimission loss of the single wall is mainly determined by its area density. Theoretically the determination of the sound transmission loss depends on the Mass law. There are several kinds of the theoretical eqations which are concerned with sound transmission loss. The result of computation from the six equations which are related with sound transmission loss. Fifty seven area densities are used for the computation of the sound transmission loss. Three equations of the mean sound transmission loss are applied to the fifteen area density to get the mean value of the sound transmission losses. As a results to get the sound transmission loss the equation that is applied should differ in accordance with the area density.