Abstract
In a musical tone signal generating apparatus of a harmonic combination system, the coefficient values of a continuous harmonic to be formed are discretely sampled. Among the sampled values, the values between each two adjacent sampling points (i.e., each two adjacent frames) which vary are selected, and only difference coefficient data therebetween are stored in a memory. When the harmonic coefficient data is to be formed, the difference coefficient data is used for the coefficient varying values between each two adjacent sampling points, and a new coefficient value is calculated. However, as for the nonvarying values between each two adjacent sampling points, no calculation is performed and an already calculated coefficient value is used, thereby updating harmonic coefficients as a function of time, and hence generating a musical tone signal whose tone color is changed as a function of time.
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