Design an interpolator that increases the input sampling rate by a factor of l = 2. Use the Remez algorithm to determine the coefficients of the FIR filter that has a 0.1-dB ripple in the passband (0 ≤ w ≤ π/2) and is down by at least 30 dB in the stop band. Also, determine the corresponding poly phase filter structure for implementing the interpolator.