The pulse rate in a $\text{DM}$ system is $56,000$ per sec. The input signal is $5 \cos (2 \pi \; 1000 \; t)+2 \cos (2 \pi \; 2000 \; t) \; \mathrm{V}$, with $t$ in sec. Find the minimum value of step size which will avoid slope overload distortion. What will be the disadvantages of choosing a value of larger than the minimum?