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后效(residual)掩蔽系指在一对声音中,由于头一个声音最强影响,第二个声音的阈值升高的现象。逆转掩蔽则是在后面的第二个声音较强声音影响下,前面的声音阈值升高现象。这两种掩蔽只在前后两个声音间隔在1～50ms时表现的最为明显,间隔延长则效果减弱。作者用做被掩蔽的声为2000Hz纯音,而掩蔽声为含有被掩蔽纯音频率的窄带噪声(1600～2500Hz)。为使掩蔽作用的大小统一,在不同受试者应用能引起相同响度的掩蔽声强。10
The residual masking refers to the phenomenon in which the threshold of the second sound rises in a pair of sounds due to the strongest influence of the first sound. Reversal masking is followed by a strong second voice under the influence of the front of the sound threshold increased phenomenon. The two masks are most pronounced only at intervals of 1 to 50 ms between the front and back of the two sounds, and the effect is weakened when the interval is extended. The author used the masked sound as 2000 Hz pure tone, while the masking sound was narrow-band noise (1600-2500 Hz) containing the masked pure tone frequency. In order to unify the size of the masking effect, the masking sound of the same loudness is applied to different subjects. 10