Consider a voice signal with maximum frequency of 4 kHz and the maximum voltage input of ±0.5V. The system consists of 8-bit DAC and ADC codec with sampling frequency of 40 kHZ. Write a Matlab program to represent the discrete time signal and display the quantized output. Assuming 4-bit, 8-bit and 16-bit ADC, demonstrate the quantisation errors due to bit resolutions. Display histogram of quantisation noises and calculate quantisation signal-to-noise ratio. Based on the quantisation noises and the system complexity, comment on the ADC you would practically implement.