METHOD AND APPARATUS FOR CONVERTING A SAMPLED DIGITAL SIGNAL TO A NATUALLY SAMPLLED DIGITAL SIGNAL

A method and an apparatus for converting a sampled digital signal to a naturally sampled digital signal are provided to use a repeat method for naturally solving cubic polynomial interpolation, thereby inputting high frequency at a high conversion speed and reducing processing resources through naturally sampling conversion. A method for converting a sampled digital signal to a naturally sampled digital signal comprises the following steps of: receiving the sampled digital signal(S1000); and determining the naturally sampled digital signal from the sampled digital signal using interpolating function(S1001). The step for determining the naturally sampled digital signal includes a step for determining a coefficient of the interpolating function using the sampled digital signal and a step for determining an intersection point of the interpolating function and a reference signal.