但是FTF算法具有众所周知的数值性能不稳定性，该问题在用有限字长定点实现时变得尤为明显。
Numerical unstability of FTF algorithm becomes conspicuous especially when the algorithm is implemented by the finite-word-length fixed-point arithmetic.
但是用定点器件实现时，在有限的精度运算中，可能出现不稳定现象和发生溢出。
But it will be occur of instability and overflow as result of operation of the finite precision.
但是用定点器件实现时，在有限的精度运算中，可能出现不稳定现象和发生溢出。
But it will be occur of instability and overflow as result of operation of the finite precision.
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