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傅里葉變換
- Module buterfly(out1_re,out1_im,out2_re,out2_im,in1_re,in1_im,in2_re,in2_im,clk);
- Output[7:0] out1_re,out1_im,out2_re,out2_im;
- Input[7:0] in1_re,in1_im,in2_re,in2_im;
- Input clk;
- reg[7:0] out1_re,out1_im,out2_re,out2_im;
- reg[15:0]temp_re,temp_im;
- reg[7:0]temp1,temp2;
- function[15:0]mul;
- input[7:0]in;
- reg[13:0]str1;
- reg[11:0]str2;
- reg[10:0]str3;
- reg[9:0]str4;
- reg[15:0]mul1,mul2;
- begin
- assign str4=in<<1;
- assign str3=str4<<2;
- assign str2=str3<<1;
- assign str1=str2<<2;
- assign mul1=str4+str3;
- assign mul2=str2+str1;
- mul=mul1+mul2;
- end
- endfunction
- always @(posdge clk)
- begin
- temp_re =mul(in2_re);
- temp im =mul(in2_im);
- temp1= temp_re[14:7-temp_im[14:7];
- temp2= temp_re[14:7]+ temp_im[14:7];
- out1_re= in1_re+temp1;
- out1_im=in1_im+temp1;
- out2_re=in1_re-temp2;
- out2_im=in2_im-temp2;
- end
- endmodule
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快速傅里葉變換（FFT）.docx
2018-12-5 23:00 上傳
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傅里葉
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