remezord

(/tools/hpmatlab/toolbox/signal/remezord.m)

Function Synopsis

[N, ff, aa, wts] = remezord(fcuts, mags, devs, fsamp)

Help text

REMEZORD  FIR order estimator (lowpass, highpass, bandpass, multiband)
	[N,Fo,Mo,W] = REMEZORD(F,M,DEV,Fs) finds the approximate order N, 
	normalized frequency band edges Fo, frequency band magnitudes Mo and 
	weights W to be used by the REMEZ function as follows:
	    B = REMEZ(N,Fo,Mo,W)
	The resulting filter will approximately meet the specifications given
	by the input parameters F, M, and DEV.  F is a vector of cutoff
	frequencies in Hz, in ascending order between 0 and half the sampling
	frequency Fs. If you do not specify Fs, it defaults to 2.  M is a vector
	specifying the desired function's amplitude on the bands defined by F.
	The length of F is twice the length of M, minus 2 (it must therefore
	be even).  The first frequency band always starts at zero, and the last
	always ends at Fs/2.  DEV is a vector of maximum deviations or ripples 
	allowable for each band.

	EXAMPLE: Design a lowpass filter with a passband cutoff of 1000Hz, a 
	stopband cutoff of 2000Hz, passband ripple of 0.01, stopband ripple 
	of 0.1, and a sampling frequency of 8000Hz:

	    [n,fo,mo,w] = remezord( [1000 2000], [1 0], [0.1 0.01], 8000 );
	    b = remez(n,fo,mo,w);

	CAUTION 1: The order N is often underestimated. If the filter does not
	meet the original specifications, a higher order such as N+1 or N+2 
	will.
	CAUTION 2: Results are inaccurate if cutoff frequencies are near zero
	frequency or the Nyquist frequency.

Cross-Reference Information

ceil           /tools/hpmatlab/toolbox/matlab/elfun/ceil.m
else           /tools/hpmatlab/toolbox/matlab/lang/else.m
end            /tools/hpmatlab/toolbox/matlab/lang/end.m
error          /tools/hpmatlab/toolbox/matlab/lang/error.m
for            /tools/hpmatlab/toolbox/matlab/lang/for.m
i              /tools/hpmatlab/toolbox/matlab/elmat/i.m
if             /tools/hpmatlab/toolbox/matlab/lang/if.m
length         /tools/hpmatlab/toolbox/matlab/general/length.m
max            /tools/hpmatlab/toolbox/matlab/datafun/max.m
min            /tools/hpmatlab/toolbox/matlab/datafun/min.m
nargchk        /tools/hpmatlab/toolbox/matlab/lang/nargchk.m
nargin         /tools/hpmatlab/toolbox/matlab/elmat/nargin.m
ones           /tools/hpmatlab/toolbox/matlab/elmat/ones.m
remlpord       /tools/hpmatlab/toolbox/signal/remlpord.m
size           /tools/hpmatlab/toolbox/matlab/general/size.m

filtdemo       /tools/hpmatlab/toolbox/signal/filtdemo.m