A uniform quantizer of PCM has 2 levels, where n is the number of bits. The input signal is m(t) = [A cos(2 fit) + A cos(2π f2t)] cos(2πfзt), fi f2f3 1. Work out the signal power. 2. Work out the SNR of the quantization output as a function of n. 3. Determine the minimum value of n such that the output SNR is not less than 60dB.