Modulate the Tonal Quality of the Human Voice by Employing Frequency Filter Effects.

The technique of changing the tone of a voice can be done by controlling its frequency components after passing through the high, medium, and low frequency control channels to eliminate the power spectrums of unwanted frequencies and maintain the necessary frequencies to achieve the desired sound. This has been done after comparing the spectrum of the voice recorded segment with some spectral frequencies of the same sentence with a more male tone. A commonly used vocal phrase spoken in a female voice, such as a woman saying "As-salamu alaykum," a well-known Islamic greeting, was chosen. An attempt was made to try changing its tone to that of a male voice saying the same sentence; "As-salamu alaykum." The results were compared with the display of the resulted spectral frequencies of the same phrase in original male voices, taking into account the findings of previous studies in this field (Norman D. Cook, 2002). Comparing the results, a similarity rate exceeding 80 percent was obtained, and this makes an FDAtool use as one of the best choices offered by MATLAB for advanced filtering. Keywords: tone of voice, vocal phrase, frequency components.