def rc2is(k):
assert numpy.isrealobj(k), '<STR_LIT>'<EOL>if max(numpy.abs(k)) >= <NUM_LIT:1>:<EOL><INDENT>raise ValueError('<STR_LIT>')<EOL><DEDENT>return (<NUM_LIT:2>/numpy.pi)*numpy.arcsin(k)<EOL>
Convert reflection coefficients to inverse sine parameters.

    :param k: reflection coefficients
    :return: inverse sine parameters

    .. seealso:: :func:`is2rc`, :func:`rc2poly`, :func:`rc2acC`, :func:`rc2lar`.

    Reference: J.R. Deller, J.G. Proakis, J.H.L. Hansen, "Discrete-Time
       Processing of Speech Signals", Prentice Hall, Section 7.4.5.