| 摘要 |
PURPOSE:To attain a bit reverse indexing action at a high speed by replacing only the adder part of a general-purpose address generating circuit with a bit reverse adder and returning output address signals through respective stages to perform successively adding actions. CONSTITUTION:In a bit converting circuit which converts the bits of input data by fast Fourier transform FFT, an address generating circuit for digital signal processor contains a selector added newly to a conventional adder/ subtractor for address generating circuit for selection of a forward or reverse carry action. A base address is loaded on an address register and the 1/2 point number of the FFT is loaded n an index register for selection of the reverse carry. Thus the adding actions are successively carried out based on the reverse carry action and a bit-reversed (converted) indexing action is obtained.
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