发明名称 |
ECONOMICAL GENERATION OF EXPONENTIAL AND PSEUDO-EXPONENTIAL DECAY FUNCTIONS IN DIGITAL HARDWARE |
摘要 |
Exponential and pseudo-exponential decay function values are generated by scaling a fractional decrease per sampling period by a previous decay function value and then subtracting the scaled fractional decrease from the previous decay function value. In one embodiment, a multiplier multiplies the fractional decrease by the previous decay function value and provides a product signal representing the scaled fractional decrease. An adder subtracts the scaled fractional decrease from the previous decay function value. In another embodiment, a shift block replaces the multiplier and approximates multiplication by a binary shift of the fractional decrease. The size of the shift is determined by the previous magnitude of the decay function as indicated by a priority encoder. Shifting generates a pseudo-exponential decay function which is suitable for music synthesis and can be generated quickly using less expensive hardware.
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申请公布号 |
WO9527940(A1) |
申请公布日期 |
1995.10.19 |
申请号 |
WO1995US04356 |
申请日期 |
1995.04.06 |
申请人 |
MEDIA VISION, INC. |
发明人 |
COOK, PERRY, R.;COLVIN, BRYAN, J., SR. |
分类号 |
G06F7/556;G10H1/057;G10H7/12;(IPC1-7):G06F7/556 |
主分类号 |
G06F7/556 |
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