Sampling rate conversion apparatus and method thereof

A sampling rate conversion apparatus which increases the sampling rate of a discrete audio signal sampled at a predetermined sampling rate by performing mapping using a fractal interpolation function, the sampling rate conversion apparatus comprising:

• an interpolation interval determination unit which divides an audio signal portion formed by a predetermined number of sampling data items into a plurality of interpolation intervals;
• a mapping point determination unit which determines, on the audio signal portion, mapping points, the number of which is in accordance with the degree of increase in the sampling rate;
• a parameter determination unit which calculates, for the respective interpolation intervals, mapping parameters for performing the mapping using the fractal interpolation function on the mapping points;
• and
• an interpolation data generation unit which performs, in all of the interpolation intervals, the mapping using the fractal interpolation function on the mapping points by using the mapping parameters according to the respective interpolation intervals, to thereby generate new sampling data items.

A computerized sampling rate conversion method accomplished via a processor which increases the sampling rate of a discrete audio signal sampled at a predetermined sampling rate by performing mapping using a fractal interpolation function, the computerized sampling rate conversion method comprising:

• determining mapping points along an audio signal portion, the number of mapping points being in accordance with the degree of increase in the sampling rate;
• calculating, for a plurality of interpolation intervals along the audio signal portion, mapping parameters for performing the mapping using the fractal interpolation function on the mapping points;
• and
• performing, in all of the interpolation intervals, the mapping using the fractal interpolation function on the mapping points by using the mapping parameters according to the respective interpolation intervals, to thereby generate new sampling data items via the processor.