| 摘要 |
An incremental digital filter provides high speed and low cost capability such as for performing fast Fourier transforms (FFTs), correlations, convolutions, and other digital filter operations. One configuration operates at microwave sample rates, computing a complete 512-point FFT in 0.2 microseconds for an effective sample rate of 2.56 gigahertz. High speed and low cost are derived from a parallel pipeline architecture in combination with incremental processing. Parallel pipeline architecture provides extremely high speed while the incremental mechanization provides a simple arrangement with a low component count for low cost. The incremental nature of the processor provides an integrating type mechanization, where integration-after-transformation yields high processing gain for signal-to-noise-ratio enhancement. High data rate input and output mechanizations are provided to accommodate the high processing rates. An improved input mechanization involves analog signal to incremental digital conversion. An improved output mechanization involves integration after filtering for data rate reductions and for signal enhancement and also involves a bus output structure for multiplexing of output parameters. |
