sjolsen

    for window in buffer.sliding_window(coefficients.len()) {
        let prediction = coefficients.iter()
                                     .zip(window)
                                     .map(|(&c, &s)| c * s as i64)
                                     .sum::<i64>() >> qlp_shift;
        let delta = buffer[i];
        buffer[i] = prediction as i32 + delta;
    }