test/std_utils/level_dbfs.m

function dbfs = level_dbfs(x)

%% dbfs = level_dbfs(x)
%
% Input
% x - signal
%
% Output
% dbfs - sigmal level in dBFS
%

%%
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%     names of its contributors may be used to endorse or promote products
%     derived from this software without specific prior written permission.
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% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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%
% Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
%

%% Reference AES 17 3.12.3
level_ms = mean(x.^2);
dbfs = 10*log10(level_ms) + 20*log10(sqrt(2));

end