求对一信号连续采集，连续取平均值的算法

对一信号连续采集，然后求平均，因为不知道能采集多少数据，所以要连续求平均，并且实现时发现所得数据明显不正确，不知道什么问题，比如temp/n,可能对你们来说这些是小问题，但是我却不知道是什么地方没有考虑周全，恳请高手指点，小弟先谢了

设计个计数器，如8192，开始时把前面的数值相加，到顶时输出，然后再取平均，每隔计数器单元输出个平均值

数据会不会溢出？我也考虑过这样实现，但是发现求得的数据很乱，我再试试吧

就是啊，采样n个数，取其平均值，然后输出，结果就是不对郁闷啊！<br>
请高人指点：<br>
library ieee;<br>
use ieee.std_logic_1164.all;<br>
use ieee.std_logic_unsigned.all;<br>
use ieee.std_logic_arith.all;--转换函数申明（整型与为矢量相互转换）<br>
entity filter is<br>
port(in_data&nbsp;&nbsp;:&nbsp;&nbsp;in&nbsp;&nbsp;std_logic_vector(7 downto 0);<br>
&nbsp; &nbsp;&nbsp;&nbsp;clk&nbsp; &nbsp;&nbsp; &nbsp;:&nbsp;&nbsp;in&nbsp;&nbsp;std_logic;<br>
&nbsp; &nbsp;&nbsp;&nbsp;out_data :&nbsp;&nbsp;out std_logic_vector(7 downto 0));<br>
end filter;<br>
architecture data_collection of filter is<br>
constant n&nbsp; &nbsp; :&nbsp;&nbsp;integer :=2;<br>
signal sum&nbsp; &nbsp; :&nbsp;&nbsp;integer range 0 to 65536 :=0;<br>
signal count&nbsp;&nbsp;:&nbsp;&nbsp;integer range 0 to 100 :=0;<br>
signal flag&nbsp; &nbsp;:&nbsp;&nbsp;std_logic :='0';<br>
begin<br>
proc:process(clk)<br>
begin<br>
if (clk'event and clk='1') then<br>
&nbsp; &nbsp;&nbsp; &nbsp;if count = n then<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;out_data &lt;= conv_std_logic_vector(sum/n,8);<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;flag&lt;='1';<br>
&nbsp; &nbsp;&nbsp; &nbsp;elsif flag='1' then<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;sum&lt;=0;<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;count&lt;=0;<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;flag&lt;='0';<br>
&nbsp; &nbsp;&nbsp; &nbsp;else<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; sum &lt;=sum+conv_integer(in_data);<br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; count&lt;=count+1; <br>
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; flag&lt;='0';&nbsp; &nbsp;&nbsp; &nbsp;<br>
&nbsp; &nbsp;&nbsp;&nbsp;end if;<br>
end if;<br>
end process proc;<br>
end data_collection;