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Block diagram of the GPSM with BMFD extension. After peripheral processing, the left and right ear signals are binaurally processed by using the BMFD that provides two better-ear channels BEL and BER and three binaural interaction channels BIL, BIC, BIR. For each of the five BMFD outputs, envelope power and power SNRs are calculated on short-time frames and then combined across the five channels of the BMFD and across auditory and modulation channels, resulting in a sensitivity index d′env based on envelope power SNRs and d′DC based on power SNRs. The final combined d′ was then compared to a threshold criterion that assumes that a signal is detected if d′ > (0.5)1/2.
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