; Written by Andrew Warren [fastfwd at ix.netcom.com]. A couple days ago, I wrote that an averaging filter of the form: (WIDTH-1)*AVE + NEW AVE = ------------------- WIDTH was "absurdly simple" if WIDTH = 256. A couple of people have asked in private email for the code; here it is: AVEHI equ [ANY FILE REGISTER] ;Holds the average [0-255]. AVELO equ [ANY FILE REGISTER] ;Holds the fractional part ;of the average. NEW equ [ANY FILE REGISTER] ;Holds the new sample. FILTER256: mov W, AVEHI mov W, NEW-w sb C dec AVEHI add AVELO, W snb C inc AVEHI 7 words, 7 instruction cycles, "NEW" is unchanged.
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<A HREF="http://www.piclist.com/techref/scenix/lib/math/dsp/av-256w-aw_sx.htm"> PIC Microcontroller DSP Math Method 8bit 16 step Averageing filter</A>
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