ressinc8.cwp.lib

su 的源代码库

RESSINC8 - Functions to resample uniformly-sampled data  via 8-coefficient sinc
		 approximations:

ress8c	resample a uniformly-sampled complex function via 8-coeff. sinc approx.
ress8r	resample a uniformly-sampled real function via 8-coeff. sinc approx.

Function Prototypes:
void ress8r (int nxin, float dxin, float fxin, float yin[], 
	float yinl, float yinr, 
	int nxout, float dxout, float fxout, float yout[]);
void ress8c (int nxin, float dxin, float fxin, complex yin[], 
	complex yinl, complex yinr, 
	int nxout, float dxout, float fxout, complex yout[]);

Input:
nxin		number of x values at which y(x) is input
dxin		x sampling interval for input y(x)
fxin		x value of first sample input
yin		array[nxin] of input y(x) values:  yin[0] = y(fxin), etc.
yinl		value used to extrapolate yin values to left of yin[0]
yinr		value used to extrapolate yin values to right of yin[nxin-1]
nxout		number of x values at which y(x) is output
dxout		x sampling interval for output y(x)
fxout		x value of first sample output

Output:
yout		array[nxout] of output y(x) values:  yout[0] = y(fxout), etc.

Notes:
Because extrapolation of the input function y(x) is defined by the
left and right values yinl and yinr, the output x values defined
by nxout, dxout, and fxout are not restricted to lie within the range 
of input x values defined by nxin, dxin, and fxin.
 
The maximum error for frequiencies less than 0.6 nyquist is 
less than one percent.

Author:  Dave Hale, Colorado School of Mines, 06/06/90