www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@basefilter/phaseresp.m
function varargout = phaseresp(this, varargin) %PHASE Phase response of a discrete-time filter. % [Phi,W] = PHASE(Hb,N) returns length N vectors Phi and W containing % the phase response of the discrete-time filter Hb, and the frequencies % (in radians) at which it is evaluated. The phase response is evaluated % at N points equally spaced around the upper half of the unit circle. If % you don't specify N, it defaults to 8192. % % [Phi,W] = PHASE(Hb) returns a matrix Phi if Hb is a vector. Each % column of the matrix corresponds to each filter in the vector. If a % row vector of frequency points is specified, each row of the matrix % corresponds to each filter in the vector. % % For additional parameters, see SIGNAL/PHASEZ. % % See also DFILT, SIGNAL/PHASEZ. % Author(s): J. Schickler % Copyright 1988-2004 The MathWorks, Inc. hopts = uddpvparse('dspopts.freqresp', varargin{:}); inputs = freqzinputs(hopts); % Strings are faster than Function Handles [Ph, w] = base_resp(this, 'computephasez', inputs{:}); opts = {}; if ~hopts.NormalizedFrequency opts = {'Fs', hopts.Fs}; end if strcmpi(hopts.FrequencySpecification, 'NFFT') opts = {opts{:}, 'SpectrumRange', hopts.SpectrumRange}; end h = dspdata.phaseresp(Ph, w, opts{:}); if nargout, varargout = {h}; else plot(h); end % [EOF]