Time-frequency analysis in infant cry classification using quadratic time frequency distributions

This paper presents a new investigation of time-frequency (t-f) based signal processing approach using quadratic time-frequency distributions (QTFDs) namely spectrogram (SPEC), Wigner-Ville distribution (WVD), Smoothed-Wigner Ville distribution (SWVD), Choi-William distribution (CWD) and modified B-distribution (MBD) for classification of infant cry signals. t-f approaches have proved as an efficient approach for applications involving the non stationary signals. In feature extraction, a cluster of t-f based features were extracted by extending the time-domain and frequency-domain features to the joint t-f domain from the generated t-f representation. Conventional features such as mel-frequency cepstral coefficients (MFCCs) and linear prediction coefficients (LPCs) were also extracted in order to compare the effectiveness of the t-f methods. The efficacy of the extracted feature vectors was validated using probabilistic neural network (PNN) and general regression neural network (GRNN). The proposed methodology was implemented to classify different sets of binary classification problems of infant cry signals from different native. The best empirical result of above 90% was reported and revealed the good potential of t-f methods in the context of infant cry classification.