Abstract
According to Goldstein's 1967 theory [J. Acoust. Soc. Am. 41, 458–479 (1967)] modulation is detected by the detection of energy fluctuations in a critical band filter centered on the lower modulation sideband. This theory predicts the relative detectabilities of AM and FM. We have generalized the theory to the detection of mixed modulation, MM, viz., combined AM and FM. The parameter space of MM is rich; AM and FM may be combined in any proportion and with any relative phase; the ratio of upper to lower sideband levels may take on any value. Therefore, MM experiments provide a stringent test of the general detection theory. In particular, as the upper sideband level is increased relative to the lower it becomes advantageous to the listener to change to a critical band filter centered on the upper sideband. The conditions for this transition can be predicted from pure tone masking data. We performed parallel AM, FM, MM, and masking experiments. Although most data support the theory, thresholds at the transitions are anomalously high in some conditions in disagreement with theory. [Supported by the NSF.]
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