{{alias}}( iterator, sigma[, options] )
    Returns an iterator which introduces additive white Gaussian noise (AWGN)
    with standard deviation `sigma`.

    If an environment supports Symbol.iterator and the provided iterator is
    iterable, the returned iterator is iterable.

    Parameters
    ----------
    iterator: Object
        Input iterator.

    sigma: number
        Standard deviation of the noise.

    options: Object (optional)
        Options.

    options.prng: Function (optional)
        Pseudorandom number generator (PRNG) for generating pseudorandom numbers
        drawn from a standard normal distribution. If provided, the `state` and
        `seed` options are ignored. In order to seed the returned iterator, one
        must seed the provided `prng` (assuming the provided `prng` is
        seedable).

    options.seed: integer|ArrayLikeObject<integer> (optional)
        Pseudorandom number generator seed. The seed may be either a positive
        unsigned 32-bit integer or, for arbitrary length seeds, an array-like
        object containing unsigned 32-bit integers.

    options.state: Uint32Array (optional)
        Pseudorandom number generator state. If provided, the `seed` option is
        ignored.

    options.copy: boolean (optional)
        Boolean indicating whether to copy a provided pseudorandom number
        generator state. Setting this option to `false` allows sharing state
        between two or more pseudorandom number generators. Setting this option
        to `true` ensures that a returned iterator has exclusive control over
        its internal state. Default: true.

    Returns
    -------
    iterator: Object
        Iterator.

    iterator.next(): Function
        Returns an iterator protocol-compliant object containing the next
        iterated value (if one exists) and a boolean flag indicating whether the
        iterator is finished.

    iterator.return( [value] ): Function
        Finishes an iterator and returns a provided value.

    iterator.PRNG: Function|null
        Underlying pseudorandom number generator.

    iterator.seed: Uint32Array|null
        Pseudorandom number generator seed.

    iterator.seedLength: integer|null
        Length of generator seed.

    iterator.state: Uint32Array|null
        Pseudorandom random number generator state.

    iterator.stateLength: integer|null
        Length of generator state.

    iterator.byteLength: integer|null
        Size (in bytes) of generator state.

    Examples
    --------
    > var src = {{alias:@stdlib/simulate/iter/sine-wave}}();
    > var it = {{alias}}( src, 0.5 );
    > var v = it.next().value
    <number>
    > v = it.next().value
    <number>

    See Also
    --------