Playback speech detection based on magnitude–phase spectrum

In current playback speech detection (PSD) Letter, commonly used features are often extracted from magnitude spectrum while phase spectrum information is not used. In order to extract more discriminative information for PSD, the idea of magnitude–phase spectrum (MPS) is proposed. Then a new feature based on MPS is proposed, namely constant-Q magnitude–phase octave coefficients (CMPOC). The experimental result on ASVspoof 2017 evaluation set using CMPOC indicates that: (i) the performance of CMPOC is better than features extracted not only from magnitude spectrum but also from MPS. (ii) CMPOC performs better than some commonly used features. (iii) Their system gives better performance than some known systems.