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Hello, can someone tell me, why are different results in arrays in_re3 and in_re5 ? Here is a part of source code for ADSP21061 (of course, all (remaining too) variables are declared,defined and set to zeros) : #include <filters.h> #define taps 2 float pm a_coeff[taps],b_coeff[taps]; float state[taps+1]; float in_re1_=0,in_re5_=0; main() { for (i=0;i<512;i++) in_re1[i]=sinf(2*pi*t[i]*50)+3.0; for (i=0; i < taps+1; i++) state[i]=0; a_coeff[1]=5.788039238732501e-002; a_coeff[0]=5.788039238732501e-002; b_coeff[1]= 1; b_coeff[0]= -8.842392152253499e-001; for (i=0;i<512;i++) { in_re3[i]=iir(in_re1[i],a_coeff,b_coeff,state,taps); } for (i=0;i<512;i++) { in_re5[i]=in_re1[i]*5.788039238732501e-002+in_re1_*5.788039238732501e-002-in_re5\ _*(-8.842392152253499e-001); in_re5_=in_re5[i]; in_re1_=in_re1[i]; } } compilation is without any error... best regards Peter Rosko |
IIR filter in VisualDSP
Started by ●October 18, 2001
