Digital re-sampling apparatus using fractional delay generator

A digital re-sampling apparatus using a fractional delay generator, comprising:

• a sample buffer for temporarily storing an input sample in synchronization with an input sampling frequency;
• a sample buffer control unit for controlling writing and reading operations of the sample buffer;
• a filter bank for digital filtering of the input samples, and comprising multiple digital filters composed of multiple taps, as many as the number of the stages in the filter bank;
• a first delay bank for differentially delaying the outputs of the filters in the filter bank based on the corresponding number of the stages;
• a fractional delay constant table for storing information on time for re-sampling of the input samples;
• a combiner bank for generating a re-sampled output for every re-sampling time through arithmetic operations performed with the output of the first delay bank and the fractional delay constant stored in the fractional delay constant table, and comprising combiners composed of combinations of adders and multipliers, as many as the number of the stages;
• and
• a second delay bank for delaying the outputs of the combiners in synchronization with the outputs of the fractional delay constant table so as to obtain sequential high-speed operation of the combiners in the combiner bank.