The power spectrum G_x (f) of an analogue signal x (t) is shown in the following figure and is the rectangle pulse. This signal is sampled at the Nyquist sampling rate and then applied to a 4-bit Midriser with dynamic range of [-8; 8] volts. 1) Determine the quantization step. 2) Determine the quantization error. 3) Assume the samples have the following amplitudes [1.2, 3.5, 1.2, 2.4]. Assign the Normal and the Gray codes to these amplitudes. In both cases, the Midriser transfer function is applied. 4) Assuming that a Gaussian distributed random variable with mean 0:5 and second moment 7 is applied to the quantizer, what will be the noise power? 5) Calculate the quantized signal to noise ratio (QSNR) in dB. 6) Calculate the Nyquist sampling rate