interpretor/faust-0.9.47mr3/benchmark/rms.dsp

   1 // Root Mean Square of n consecutive samples
   2 RMS(n) = square : mean(n) : sqrt ;
   3
   4 // the square of a signal
   5 square(x) = x * x ;
   6
   7 // the mean of n consecutive samples of a signal
   8 // uses fixpoint to avoid the accumulation of
   9 // rounding errors
  10 mean(n) = float2fix : integrate(n) : fix2float : /(n);
  11
  12 // the sliding sum of n consecutive samples of a signal
  13 integrate(n,x) = x - x@n : +~_ ;
  14
  15 // convertion between float and fix point
  16 float2fix(x) = int(x*(1<<20));
  17 fix2float(x) = float(x)/(1<<20);
  18
  19 // Root Mean Square of 1000 consecutive samples
  20 process = RMS(1000) ;