www.gusucode.com > signal 工具箱matlab源码程序 > signal/+fspecs/@abstractspecwithfs/normalizefreq.m
function normalizefreq(h,boolflag,Fs) %NORMALIZEFREQ Normalize frequency specifications. % Copyright 2003-2011 The MathWorks, Inc. % Check for error condition first if (nargin > 2) && boolflag, error(message('signal:fspecs:abstractspecwithfs:normalizefreq:FsnotAllowed')); end cachecurrentnormalizedfreq(h) % Check for early return condition next if nargin < 2, boolflag = true; end if boolflag && h.NormalizedFrequency, return; end oldFs = h.privFs; % Assign Fs if specified if (nargin > 2) && ~boolflag, h.privFs = Fs; end oldnormfreq = h.NormalizedFrequency; h.privNormalizedFreq = boolflag; if (~h.privFs == 0), p = props2normalize(h); if boolflag, for n = 1:length(p), set(h,p{n},2*get(h,p{n})/h.privFs); end else if ~oldnormfreq % If normalized frequency was already false set Fs so that specs % are recomputed correctly cf = h.privFs/oldFs; % Correction factor else cf = h.privFs*0.5; end for n = 1:length(p), set(h,p{n},cf*get(h,p{n})); end end end normalizetime(h,oldFs,oldnormfreq); % [EOF]