Variations on Itakura´s spectral match score

F. Itakura´s spectral match score is commonly used in the automatic recognition of continuous speech to compare a template to the continuous speech. This paper demonstrates that a symmetric version of this score adds some strength to the original score. It also demonstrates that by oversampling a band-limited signal, energy information is incorporated into this spectral match score, the energy level of a frame being contained in the in-band to out-of-band energy level ratio. This energy information further improves the automatic recognition process. A technique is presented which makes effective use of this energy information, without changing the sampling rate.