2. A method of converting voice characteristics of synthesized speech to obtain modified synthesized speech of any one of a plurality of voice sounds simulating child-like, adult, aged and sexual characteristics from a single applied source of synthesized speech, said method comprising: providing a source of synthesized speech in the form of digital speech data subject to speech synthesization using a predetermined sample period comprising a known number of task-accomplishing time increments; adjusting the sampling period of the digital speech data from said source of synthesized speech in a manner altering the digital speech formants contained therein to a preselected degree; producing modified digital speech data including the adjusted sampling period and having modified voice characteristics as compared to the synthesized speech from said source; generating audio signals representative of human speech from the modified digital speech data; and converting said audio signals into audible synthesized human speech having different voice characteristics from the synthesized human speech which would have been obtained from said source of synthesized speech.
4. A method as set forth in claim 2, wherein the sampling period associated with the digital speech data from said source of synthesized speech is adjusted by adding a predetermined number of time increments to the known number of time increments included in said sampling period to provide a new sampling period having a predetermined time duration greater than that of said sampling period associated with the synthesized speech from said source.