| Summary: | 碩士 === 朝陽科技大學 === 建築及都市設計研究所 === 93 === The centralized development of Taiwan cities and close neighboring of living environment and roadway system that make close living space easily be interfered by noise, especially the space as matter of conversation (classroom, conference room). Chen, C. Y. (2003) confirmed that moving noise easier lead to error score of articulation test (p<0.005). Although moving noise will affect listening ability, however, pronunciation has sound features and masking effect to different syllables in acoustics, therefore it is necessary to avoid known problems from studying interference level of moving noise. The expected studies include: 1. The frequency effect of sound masking; 2. The S/N ratio of sound and environment noise; 3. Moving simulate approach to sound source in laboratory; 4. Sound localization sensitivities and motion factuality; 5. The time feature of sound and moving noise masking source; 6. Moving velocity and so on. This study probes into the metal sensation threshold of moving noise to the ability of speech intelligibility as evaluation standard for moving noise toward interference level of living.
According to this research, we found: 1. The masking effect of 500Hz(48.525±1.205dB(A)) is higher than 2kHz(36.759±2.588dB(A)), while the error score of 2kHz sound is relatively high; 2. Both moving velocity of two sound sources (500、2kHz) have significant difference to sound interference (p＜0.001)；3.When time duration is fixed on central position of masking sound, 16º/s has higher masking ability to sound, while the masking ability of 16º/s falls significantly (500Hz：40.00dB(A)；2kHz：31.29dB(A)) if time duration is fixed on the start of masking sound；4. When frequency is 2kHz and time duration is fixed on the central position of masking sound, 40~56º/s would become key range of sensation ability. We also propose the forecast formula for moving speed to sound masking level in accordance with experiment result; 5. By using loudspeaker arrays to simulate moving sound source, we found the minimum overlap scope of 500Hz is 4ms and the rise/decay is 2ms respectively；minimum overlap scope between 2kHz is 7ms and the rise/decay is 4ms respectively. Accordingly, it confirms that said simulation approach has better sound localization sensitivities.
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