function c=crestfactor(insig)
%CRESTFACTOR Crest factor of input signal in dB
% Usage: c=crestfactor(insig);
%
% CRESTFACTOR(insig) computes the crest factor of the input signal
% insig. The output is measured in dB.
%
% See also: rms, gaindb
%
% Url: http://ltfat.github.io/doc/sigproc/crestfactor.html
% Copyright (C) 2005-2023 Peter L. Soendergaard <peter@sonderport.dk> and others.
% This file is part of LTFAT version 2.6.0
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
c=20*log10(norm(insig,Inf)/rms(insig));