Journal of Theoretical and Applied Information Technology
To minimize transmission bandwidth in speech based communication systems such as telephone systems, narrowband representation of the signal is generally used. This band-limited signal can able to represent the vowel sounds without much distortion, but it is not suitable for representing consonant sounds, mostly fricative consonants. Artificial Band Extension (ABE) techniques are used to generate a wideband signal from the narrowband signal. Since most of the high frequency components and the fricative consonants were absent in the narrowband representation of the sound, it is a challenging task to create those missing components in the wideband equivalent signal.