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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>I am struggling with a programming problem in my version of KISS. I have a version that works and a version that doesn’t. The problem appears to be happening in the SharpDSP (or FFTW) method that does the reverse FFT work. <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>The program invokes the DoDSPProcess method in SharpDSP which eventually invokes a DoFFTReverseMain method. The passed parameters are:<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:green'>// in: tmp_cpx_2 out: tmp_cpx_3</span><span style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'> plan_rev_main = <span style='color:#2B91AF'>FFTW</span>.dft_1d(size,<o:p></o:p></span></p><p class=MsoNormal style='margin-left:1.0in;text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>h_tmp2.AddrOfPinnedObject(),<o:p></o:p></span></p><p class=MsoNormal style='margin-left:1.0in;text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>h_tmp3.AddrOfPinnedObject(),<o:p></o:p></span></p><p class=MsoNormal style='margin-left:1.0in;text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>FFTW</span><span style='font-size:9.5pt;font-family:Consolas'>.<span style='color:#2B91AF'>fftw_direction</span>.Backward,<o:p></o:p></span></p><p class=MsoNormal style='margin-left:1.0in;text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas;color:#2B91AF'>FFTW</span><span style='font-size:9.5pt;font-family:Consolas'>.<span style='color:#2B91AF'>fftw_flags</span>.Measure);<o:p></o:p></span></p><p class=MsoNormal style='margin-left:1.0in;text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>I have two versions of my code. One works fine. The other returns a different tmp_cpx_3, even though the tmp_cpx_2 is the same.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>The two versions of my code differ in that the working version has rcvr created in the MainForm (the same as KISS) and the broken one has the MainForm create a RX object which in turn creates rcvr.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>Any clues as to what I am doing wrong? Please reply off list.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>I apologize to those on the list who aren’t into this stuff, but I am at my wits end and don’t know where else to turn.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;font-family:Consolas'>Gordon, KA2NLM<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></div></body></html>