弱背景声对声音信号感受的影响

INFLUENCE OF WEAK BACKGROUND SOUND ON SOUND SIGNAL PERCEPTION

摘要: 本工作在6名受试者身上比较了在有及无连续背景声作用下声音信号感受阈的变化。当信号及背景声为频率相同的纯音时,弱背景声（强度为阈上0—5分贝）能使信号感受阈降低8分贝左右。在有白噪声干扰的条件下,这一作用仍然存在。信号感受阈的降低是弱背景声提高了听觉系统对信号感受能力的结果。当背景声与信号有较大的频率差时,弱背景声即无降低信号感受阈的作用。

Abstract: The thresholds of sound signal perception in the presence or absence of a continuous background sound were compared on 6 subjects. When both the signal and the background sound were pure tone of the same frequency, the thresholds of signal perception in the presence of weak background sound (0-5 db above threshold) were about 8 db lower, in average, than when the background sound was absent. This lowering of signal perception threshold was explained as a result of sensibilization of the auditory system by the background sound. Such kind of sensibi-lization effect was not eliminated by the masking of white noise. It, however, did not appear, if the signal differed from the background sound in frequency in more than 10 cps.