96 Input can be generally assumed to be white noise.For unit-variance white noise input,variance at node x is given by: -∑f0 (11.5) /scaling is commonly used because most input signals can be assumed to be white noise. (11.5)is a variance (not a strict bound),there is a possibility of overflow. We can increase 6 in (11.3)to prevent possible overflow. But increasing o will decrease SNR (signal-to-noise ratio). Thus,there is a trade-off between overflow and round-off noise. 2021年2月 62021年2月 6  Input can be generally assumed to be white noise. For unit-variance white noise input, variance at node x is given by:  l2 scaling is commonly used because most input signals can be assumed to be white noise.  (11.5) is a variance (not a strict bound), there is a possibility of overflow.  We can increase δ in (11.3) to prevent possible overflow.  But increasing δ will decrease SNR (signal-to-noise ratio). Thus, there is a trade-off between overflow and round-off noise