| 摘要 |
<p>PURPOSE:To execute multiplication processing of space frequency for high resolation imaging at extremely high speed by storing N pieces of data resulting from Fourier transformation in mutually corresponding storage places in sa plural number of memories and by reading the N pieces of data sequentially one by one. CONSTITUTION:Input data (N pieces of real data and N/2 pieces of complex data) is processed for the FFT operation by the Fourier transformation device. Result A (K) of the FFT operation which is the output from memory MM or from high speed access memories HM1 and HM2 is commonly written in mutually corresponding addresses in memories M1, M2, M3 and M4, and in reading the resultant pieces of data, they are read in the order of M1, M2, M3 and M4 as if the addresses were conscutive in a memory. With this, memory M1 is accessed for the results of Fourier transformation operation for K=0-N-1, and for the results of Fourier transformation operation for K-N-2N-1, K=2N-3N-1, K=3N-4N-1 memories M2, M3 and M4 are accessed, respectively.</p> |
