Speech processing using joint features derived from the modified group delay function

This paper discusses the significance of joint cepstral features derived from the modified group delay function and MFCC in speech processing. We start with a definition of cepstral features derived from the modified group delay function called the modified group delay feature (MODGDF) which is derived from the Fourier transform phase. Robustness issues like similarities of the MODGDF to RASTA and cepstral mean subtraction are discussed. The efficiency with which formants can be reconstructed for noisy cellular speech using joint features derived from early fusion is illustrated. The joint features are used for four speech processing tasks phoneme, syllable, speaker, and language recognition. Based on the results of analysis and performance evaluation the significance of joint features derived from the MODGDF and MFCC are discussed. © 2005 IEEE.