| 摘要 |
A complex arithmetic unit (CAU) for manipulating digital data representative of complex numbers. The CAU receives control signals and digital data representative of the real and imaginary parts of the complex operands from a host computer, and performs division, magnitude, and multiplication operations. The CAU has an input port for receiving input data and control signals; an output port for transferring output data and control signals; a RAM for storing input data, output data, and the results of intermediate calculations, the RAM having an input bus connected to the input port and an output bus connected to the output port; a data buffer for transferring digital data from the output bus; a controllable multiplier which also performs addition and subtraction of products, with an input connected to the input bus and the buffer, and an output for transferring digital output data; a parallel scaling multiplexer which receives the multiplier output data and extracts a selected contiguous subset of digital bits to scale the multiplier output data according to a predetermined scaling factor; an address multiplexer for extracting predetermined aspects of the multiplier output data; a lookup PROM addressable in response to the address multiplexer for storing approximate results of mathematical operations and transferring the results to the data buffer means and the multiplier input; a control device responsive to predetermined aspects of the multiplier output data extracted by the data scaling multiplexer control device and the address multiplexer, for controlling the other components.
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