Resource reuse perfect reconstruction sub-band synthesis processing method

The present invention provides a resource reuse perfect reconstruction sub-band synthesis processing method. The method comprises the following steps of 1 carrying out the perfect filtering factor adjustment processing on an input signal; 2 carrying out the IFFT and the coefficient correction; 3 adopting N FIFO which are in head-to-tail ligation to carry out the data cache and output; 4 adopting a reconstruction filtering coefficient existing in a matrix to carry out the filtering process on the output data of the FIFO; 5 carrying out the extraction and symbol adjustment on a filtering output signal. The method can realize the 2m times reuse of the resources, and a resource reuse multiple is directly proportional with a sub-band number, namely, the larger is the sub-band number, the more is the resource reuse times, and the more obvious is the advantages of the present invention. A sub-band synthesizer realized by the method enables the hardware resource cost to be reduced substantially, is flexible in parameter configuration and wide in application range, and is suitable for the systems of different bandwidths and rates to carry out the sub-band synthesis.