Convert inverse sine parameters to reflection coefficients
K = is2rc(isin)
input inverse sine parameters. Needs to be an array real numbers
output reflection coefficients corresponding to the reflection coefficients in input
This function returns a vector of reflection coefficients from a vector of inverse sine parameters output array has k(i) = sin(pi/2*isin(i))
Example k = [0.3090 0.9801 0.0031 0.0082 -0.0082]; isin = rc2is(k) //Gives inverse sine parameters k_dash = is2rc(isin)
J.R. Deller, J.G. Proakis, J.H.L. Hansen, "Discrete-Time Processing of Speech Signals", Prentice Hall, Section 7.4.5