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The quantization approach used in this paper has an added advantage
when dealng with current FPGA hardware. FPGAs, like early processors,
are much more efficient on integer operations, than floating point operations.
In addition they provide much more precision flexiblity than traditional
processors. Floating point arrithmtic can be replaced by fixed-point
integer math. Early work suggests that FFT portion of migration can be sped
up by a factor of 3-10 given current hardware.
Stanford Exploration Project