Differential limen of sounds transmitted from neighbors

摘要

Various sounds are transmitted through walls from the neighboring houses in multi-dwelling houses and when these sounds are detected by the neighbors, they may cause noise problems. In order to examine whether the sounds transmitted from neighbors are detected, two experiments were conducted. In Exp.1 pink noise was used as a carrier. In Exp.2 pink noise whose frequency components were simulated to the speech and music performance transmitted through walls from a neighbor's house was used as carrier. Also weighting D-50 was added to the sounds in Exp.2. The sound insulation deficit was added to the comparison stimuli at 125 Hz, 2 kHz and 4 kHz octave bands in both experiments. The differential limen (DL) was obtained using the method of adjustment. Five females and 16 males aged between 21 and 30 years old (average was 22.7) participated in both experiments. All had normal hearing ability. The following results were found. (1) DL using pink noise in Exp.l was less than 2 dB. (2) In Exp.2 the deficit of 125 Hz band was detected at the level of less than 2 dB. On the other hand, DL of 2 kHz and 4 kHz was around 3-4 dB.