/ * mkfilter -- given n, compute recurrence relation to implement Butterworth, Bessel or Chebyshev filter of order n A.J. Fisher, University of York <fisher@minster.york.ac.uk> September 1992 */ /* Header file */ #define global #define unless(x) if(!(x)) #define until(x) while(!(x)) #define VERSION "4.6" #undef PI #define PI 3.14159265358979323846 /* Microsoft C++ does not define M_PI ! */ #define TWOPI (2.0 * PI) #define EPS 1e-10 #define MAXORDER 10 #define MAXPZ 512 /* .ge. 2*MAXORDER, to allow for doubling of poles in BP filter; high values needed for FIR filters */ #define MAXSTRING 256 typedef void (*proc)(); typedef unsigned int uint; extern "C" { double atof(const char*); int atoi(char*); void exit(int); }; extern char *progname; extern void readdata(char*, double&, int&, double*, int&, double*); inline double sqr(double x) { return x*x; } inline bool seq(char *s1, char *s2) { return strcmp(s1,s2) == 0; } inline bool onebit(uint m) { return (m != 0) && ((m & m-1) == 0); } inline double asinh(double x) { /* Microsoft C++ does not define */ return log(x + sqrt(1.0 + sqr(x))); } inline double fix(double x) { /* nearest integer */ return (x >= 0.0) ? floor(0.5+x) : -floor(0.5-x); }
file: /Techref/uk/ac/york/cs/www-users/http/~fisher/software/mkfilter/current/mkfilter.h.txt, 1KB, , updated: 2000/4/4 11:46, local time: 2024/5/1 16:47,
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