1.完整项目描述和程序获取
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2.部分仿真图预览
3.算法概述
FIR(Finite Impulse Response)滤波器：有限长单位冲激响应滤波器，又称为非递归型滤波器，是数字信号处理系统中最基本的元件，它可以在保证任意幅频特性的同时具有严格的线性相频特性，同时其单位抽样响应是有限长的，因而滤波器是稳定的系统。因此，FIR滤波器在通信、图像处理、模式识别等领域都有着广泛的应用。
4.部分源码
module xfilter(clk, rst,
i_valid_new_pixel,
i_new_pixel,
i_valid_lpos,
i_valid_cpos,
i_valid_rpos,
i_rowM,
o_valid_filt,
o_filt_pixel,
o_colN,
o_rowM
);
parameter XB = 10;
parameter PB = 8;
input clk;
input rst;
input i_valid_new_pixel;
input [(PB + 2) - 1:0] i_new_pixel;
input i_valid_lpos;
input i_valid_cpos;
input i_valid_rpos;
input i_rowM;
output o_valid_filt;
output [PB - 1:0] o_filt_pixel;
output o_colN;
output o_rowM;
reg [(PB + 4) - 1:0] r_pixel_sum = 0;
reg [PB - 1:0] rr_pixel_sum = 0;
reg r_valid_lpos = 0;
reg r_valid_cpos = 0;
reg r_valid_rpos = 0;
reg r_valid_filt_pixel = 0;
reg rr_valid_cpos = 0;
reg r_valid_pixel_in = 0;
reg rr_valid_pixel_in = 0;
........................................................................
always @(posedge clk)
begin
//read in pixel
r_valid_lpos <= i_valid_lpos;
r_valid_cpos <= i_valid_cpos;
r_valid_rpos <= i_valid_rpos;
rr_valid_cpos <= r_valid_cpos;
r_colN <= i_valid_rpos;
rr_colN <= r_colN;
rrr_colN <= rr_colN;
r_rowM <= i_rowM;
rr_rowM <= r_rowM;
rrr_rowM <= rr_rowM;
if (rst)
begin
r_valid_pixel_in <= 0;
rr_valid_pixel_in <= 0;
r_valid_filt_pixel <= 0;
end
else
begin
r_valid_pixel_in <= c_valid_pixel_in;
rr_valid_pixel_in <= r_valid_pixel_in;
r_valid_filt_pixel <= rr_valid_pixel_in;
end
r_pixel2 <= c_pixel2;
end
wire [PB + 4 - 1: 0] c_pixel_sum = (rr_valid_cpos) ? r_pixel_sum + r_pixel2 + 8: r_pixel_sum + 8;
reg r_valid_new_pixel = 0; //needed to check if new row's data was added
//add filter
always @(posedge clk)
begin
r_valid_new_pixel <= i_valid_new_pixel;
if (r_valid_rpos)
begin
if (r_valid_new_pixel) //new data added to queue
r_pixel_sum <= {c_pixel1, 1'd0} + c_pixel2;
else
r_pixel_sum <= {c_pixel0, 1'd0} + c_pixel1;
end
else
begin
r_pixel_sum <= c_pixel0 + {c_pixel1, 1'd0};
end
rr_pixel_sum <= c_pixel_sum[PB + 4 -1: 4];
end
//3 pixel buffer
queue PIXBUF (.clk(clk),
.i_valid_pixel(i_valid_new_pixel),
.i_pixel(i_new_pixel),
.o_pixel0(c_pixel0),
.o_pixel1(c_pixel1),
.o_pixel2(c_pixel2)
);
endmodule
module queue(clk, i_valid_pixel, i_pixel, o_pixel0, o_pixel1, o_pixel2);
parameter PB = 8;
.....................................................
endmodule
A411
