1. [15] Consider the following analog signal. This signal is sampled at a sampling frequency of 500 Hz and quantized using a 3-bit quantizer with amplitude range from -1.0 to 1.0 volt. Amplitude(volt) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 0 1 2 3 4 5 6 7 8 9 10 Time(msec) a) Circle all the sample points in the graph above. Assume the first sample is at time = 0 second. b) What are the quantization intervals (volt)? Fill the following "digital-to-analog" conversion map. Level Quantization intervals (volt) Digital word 7 ()-(1) 111 6 110 5 101 4 3 100 011 2 010 1 001 0 (-1) - ( ) 000 c) Assign a digital word to each sample point based on part b). Fill the following table with all the samples. Sample number Sample (time, amplitude) Digital word 1 (first sample) (0, 0.5) 2 (second sample) d) What is the resulting bit rate from this Analog to Digital converter?