Lutfi R A
Waisman Center, University of Wisconsin, Madison 53705.
J Acoust Soc Am. 1988 Jan;83(1):163-77. doi: 10.1121/1.396442.
In a previous article [Lutfi, J. Acoust. Soc. Am. 76, 1045-1050 (1984)], the following relation was used to predict measures of frequency selectivity obtained in forward masking from measures obtained in simultaneous masking: F(g) = G + H(g) - H(0), where, for a given masker level, F is the amount of forward masking (in dB) as a function of signal-masker frequency separation (g), H is the amount of simultaneous masking, and G is the amount of forward masking for g = 0. In the present study, the relation was tested for a wider range of signal and masker frequencies, masker levels, and signal delays. The relation described thresholds from all conditions well with the inclusion of one free parameter lambda corresponding to a constant frequency increment, F(g) = G + H(g + lambda) - H(lambda). The parameter lambda was required to account for observed shifts in the frequency of maximum forward masking. It is argued that a single tuning mechanism can account for commonly observed differences between simultaneous- and forward-masked measures of frequency selectivity.
在之前的一篇文章中[卢特菲，《美国声学学会杂志》76, 1045 - 1050 (1984)]，使用了以下关系式从同时掩蔽中获得的测量值来预测前向掩蔽中获得的频率选择性测量值：F(g) = G + H(g) - H(0)，其中，对于给定的掩蔽声级，F是前向掩蔽量（以分贝为单位），它是信号 - 掩蔽声声频间隔(g)的函数，H是同时掩蔽量，G是g = 0时的前向掩蔽量。在本研究中，在更广泛的信号和掩蔽声声频范围、掩蔽声级和信号延迟条件下对该关系式进行了测试。通过纳入一个对应于恒定频率增量的自由参数λ，即F(g) = G + H(g + λ) - H(λ)，该关系式很好地描述了所有条件下的阈值。需要参数λ来解释观察到的最大前向掩蔽频率的偏移。有人认为，单一的调谐机制可以解释同时掩蔽和前向掩蔽频率选择性测量中常见的差异。
