ustbeexponentiallyincreased,howevertheEABofFPGAislimited.SothealgorithmofROMcompressionbasedonthesymmetryofsinewaveisadoptedinthesystem.Sinewaveofoneperiodisdividedintosections:[~π/]、[π/~π]、[π~π/]、[π/~π].Usingthesymmetryofsinewave,sampledamplitudesofthefirstsectionarestoredintheROMtable.Byaddressconversionandamplitudeconversion,sampledamplitudesofoneperiodsinewavecanbegenerated.Bythismeans,theROMsizeisaquarteroftheprevioussize.InthesameROM,samplingpointscanbeincreasedbytimeswiththismethod[].ThestructurediagramofthealgorithmisshowninFig..Figure.StructurediagramofROMcompressionAlgorithmIntheabovestructurediagram,theaddressofROMtableisL-bit.SampledamplitudesofquarterwavearestoredintheROMtable.Theoutputaddressofphaseaccumulatoris(L+)-bit.ThelowL-bitareusedtoquerytheROMtablewhilethehigh-bitareusedtoidentifyphasesections.Whenthehighestbitis,theoutputofRO段为~π,其图形分辨率为。
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