3. A speech synthesis system comprising: input means for receiving frames of speech data including digital speech values and frame rate data indicative of a variable time interval between the start of a current frame of speech data and the start of the next successive frame of speech data; frame control means coupled to said input means for controlling the rate at which new frames of speech data are received by said input means in response to frame rate data included in a current frame of speech data, the time interval between the receipt of successive new frames of speech data by said input means being variable and being determined by said frame rate data; interpolator means coupled to said frame control means for providing a variable number of interpolation calculations to define interpolated speech values between adjacent frames of speech data from last implemented speech data in which the number of interpolation calculations in a given instance is determined by said frame rate data; speech synthesizer means coupled to said input means and to said interpolator means for selectively converting said digital speech values and interpolated values thereof into analog speech signals representative of human speech; and audio means coupled to said speech synthesizer means for converting said analog signals representative of human speech into audible sounds.
3. A speech synthesis system comprising: input means for receiving frames of speech data including digital speech values and frame rate data indicative of a variable time interval between the start of a current frame of speech data and the start of the next successive frame of speech data; frame control means coupled to said input means for controlling the rate at which new frames of speech data are received by said input means in response to frame rate data included in a current frame of speech data, the time interval between the receipt of successive new frames of speech data by said input means being variable and being determined by said frame rate data; interpolator means coupled to said frame control means for providing a variable number of interpolation calculations to define interpolated speech values between adjacent frames of speech data from last implemented speech data in which the number of interpolation calculations in a given instance is determined by said frame rate data; speech synthesizer means coupled to said input means and to said interpolator means for selectively converting said digital speech values and interpolated values thereof into analog speech signals representative of human speech; and audio means coupled to said speech synthesizer means for converting said analog signals representative of human speech into audible sounds. 15. The speech synthesis system according to claim 3, wherein the frame rate data included in said frames of speech data is in a coded form, and further including decoding means coupled to said input means for decoding said frame rate data, said frame control means being coupled to said decoding means as well as to said input means.