VARIABLE AUDIBLE SIGNAL SOUND GENERATOR

摘要

PURPOSE: A variable audible signal sound generator is provided to minimize change elements according to the change of an audible signal sound standard and apply the change elements within a short time. CONSTITUTION: The first adder(11) of an IIR filter(10) adds a predetermined frequency deciding coefficient and a fixed coefficient with the first level-deciding coefficient ¥ø0 for outputting y(n). The first integrator(12) delays the output of the first adder at a predetermined time. The second adder(13) adds the output of the first integrator(12) and the second level deciding coefficient ¥ø1, generates a frequency deciding coefficient a1 for feeding back to the first adder(11). The second integrator(14) delays the output of the second adder(13) at a predetermined time. The third adder(15) adds the output of the second integrator(14) and the third level deciding coefficient ¥ø2, generates a fixed coefficient a2 for feeding back to the first adder(11).