12. A computer system capable of producing audible synthesized human speech, said computer system comprising: a computer input device; a central processing unit; audio means for receiving analog signals representative of human speech and converting said analog signals into audible sound; speech synthesizer means responsive to control signals generated by said central processing unit, said speech synthesizer means including first memory means for permanently storing a first plurality of coded speech data, second memory means for temporarily storing a second plurality of coded speech data, said second plurality of coded speech data being provided by said central processing unit, speech synthesizer processor means for converting coded speech data into digital speech signals representative of human speech, selector means for selectively activating one of said first and second memory means to apply selected coded speech data to said speed synthesizer processor means from either one of said first and second pluralities of coded speech data in response to a control signal provided by said central processing unit designating which of said first and second memory means is active, and digital-to-analog converter means operably associated with said speech synthesizer processor means for converting said digital speech signals into analog signals representative of human speech; and means for coupling said digital-to-analog converter means to said audio means such that said audio means is effective to convert said analog signals into audible sound.
12. A computer system capable of producing audible synthesized human speech, said computer system comprising: a computer input device; a central processing unit; audio means for receiving analog signals representative of human speech and converting said analog signals into audible sound; speech synthesizer means responsive to control signals generated by said central processing unit, said speech synthesizer means including first memory means for permanently storing a first plurality of coded speech data, second memory means for temporarily storing a second plurality of coded speech data, said second plurality of coded speech data being provided by said central processing unit, speech synthesizer processor means for converting coded speech data into digital speech signals representative of human speech, selector means for selectively activating one of said first and second memory means to apply selected coded speech data to said speed synthesizer processor means from either one of said first and second pluralities of coded speech data in response to a control signal provided by said central processing unit designating which of said first and second memory means is active, and digital-to-analog converter means operably associated with said speech synthesizer processor means for converting said digital speech signals into analog signals representative of human speech; and means for coupling said digital-to-analog converter means to said audio means such that said audio means is effective to convert said analog signals into audible sound. 15. A computer system as set forth in claim 12, wherein said second memory means is a shift register.