“…Therefore, developing an effective countermeasure to distinguish between genuine and replayed samples has become a recent research focus [6], [7], [8], [9]. While there have been many prior efforts in this area [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23]), they only focus on detecting replay attacks based on single-channel input and therefore only leverage the temporal and spectral features. However, we identified three reasons why a countermeasure designed using multi-channel audio input could provide improved performance.…”