www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@basefilter/groupdelay.m
function varargout = groupdelay(this, varargin) %GROUPDELAY Group delay of a discrete-time filter. % Gd = GROUPDELAY(Hb) returns group delay response object Gd. % % For additional parameters, see DFILT.BASEFILTER/FREQRESP. % % See also DFILT, SIGNAL/GRPDELAY. % Author(s): J. Schickler % Copyright 1988-2004 The MathWorks, Inc. hopts = uddpvparse('dspopts.freqresp', varargin{:}); inputs = freqzinputs(hopts); [Gd, w] = base_resp(this, 'computegrpdelay', inputs{:}); opts = {}; if ~hopts.NormalizedFrequency opts = {'Fs', hopts.Fs}; end if strcmpi(hopts.FrequencySpecification, 'NFFT') opts = {opts{:}, 'SpectrumRange', hopts.SpectrumRange}; end h = dspdata.groupdelay(Gd, w, opts{:}); if nargout, varargout = {h}; else plot(h); end % [EOF]