www.gusucode.com > signal 工具箱matlab源码程序 > signal/@filtdes/@hphalfmin/maskinfo.m
function cmd = maskinfo(hObj, d) %MASKINFO Return the mask information % Author(s): J. Schickler % Copyright 1988-2002 The MathWorks, Inc. cmd = base_maskinfo(hObj, d); specobjs = get(hObj, 'SpecObjs'); fcmd = maskinfo(specobjs(1), d); mcmd = maskinfo(specobjs(2), d); fcmd{2} = setstructfields(fcmd{2}, mcmd{1}); fcmd{1} = fcmd{2}; % Copy defaults from passband fcmd{1}.frequency = [1 1]*getnyquist(d) - fliplr(fcmd{2}.frequency); fcmd{1}.magfcn = 'stop'; if isdb(d), val = fcmd{2}.amplitude; val = (10^(val/20) - 1)/(10^(val/20) + 1); % perform the tolinear passband conversion val = -20*log10(val); % perform the todb stopband conversion fcmd{1}.amplitude = val; else fcmd{2}.astop = -fcmd{2}.amplitude; end cmd.bands = fcmd; % [EOF]