| 摘要 |
PURPOSE:To reduce and to simplify the circuit scale and also to improve the arbitrariness of a delta width rate of change by varying a data for a delta width differentiation data ROM so as to decide optionally a value added/ subtracted to/from the delta width. CONSTITUTION:A delta width t at a time (t) is stored in a delta width register 1 and a data corresponding to an address of t in a delta width differentiation data ROM 5 is inputted to an adder/subtractor 3, where the inputted delta width t and the inputted digital data are subject to addition/subtraction. Then the result is inputted to the register 1 and an analog waveform synthesis circuit as a delta width t+1. The register 1 stores the delta width t+1 as a delta width at a time (t+1). Thus, if it is required to vary the rate of change in the delta width, it is easily varied and the circuit scale is reduced and simplified.
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