1. The problem statement, all variables and given/known data Hi everyone. I was trying to solve an exercise from the book Leon couch, communication systems, number 3.7 of the 6th edition. This is the statement: In a PCM binary system, the quantisation noise mustn t exceed the percentage value P of the peak power. Show that the required number of bit for each word is: N> log2(10)*log(50/P). I tried to solve it by applying this reasoning : The s/n ratio is equal to 3M^2 for a PCM system. Then If N<(p/100)*s, then s/n>(100/p). Then I solve it by passing to decibel, and making the logaritm, but I obtain something quite different, and I don t undestand where I was wrong.