Method and integrated circuit for electronic waveform generation of voiced audio tones

摘要

A tone generator clears all registers in a twenty-nine stage device so that the previous results are not used in the calculations for a next tone sample. A series approximation of a desired complex sound waveform is achieved by calculating the contributions of twenty-nine time steps back in time. Twenty-nine different address phases are respectively applied to twenty-nine stacked arithmetic units. Each arithmetic unit comprises a first adder that inputs the output of a previous arithmetic unit and the input of the previous arithmetic unit. A second adder inputs the result from the first adder and one of the twenty-nine address phases. The second adder then reads a waveform generator connected to a multiplier that is controlled by a common multiplication factor "B". The output of the twenty-ninth unit produces the desired tone without any of the stacked units feeding back any signals.