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Assembly Source File  |  1989-01-24  |  731 b   |  19 lines
  1. ;
  2. ; This program originally available on the Motorola DSP bulletin board.
  3. ; It is provided under a DISCLAIMER OF WARRANTY available from
  4. ; Motorola DSP Operation, 6501 Wm. Cannon Drive W., Austin, Tx., 78735.
  5. ; 
  6. ; Last Update 15 Jul 87   Version 1.0
  7. ;
  8.                                                                                                                                
  9. iir4    macro
  10. iir4    ident   1,0
  11. ;
  12. ;       IIR4 - Implements biquad filter
  13. ;
  14.         move    x:(r0)+,x0  y:(r4)+,y0  ;s1,a1
  15.         mac     x0,y0,a  x:(r0),x1  y:(r4)+,y0  ;s2, a2
  16.         macr    x1,y0,a  x0,x:(r0)- y:(r4)+,y0  ;new s2, get b1
  17.         mac     x0,y0,a  a,x:(r0)   y:(r4)+,y0  ;new s1, get b2
  18.         macr    x1,y0,a
  19.