dB2lin.m

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function lin = dB2lin(dB,varargin)

[type] = defaultargs({'db'},varargin);

switch lower(type)
    case 'db'
        fact = 0;
    case 'dbm'
        fact = -30;
    case 'dbu'
        fact = -60;
    otherwise
        error('Conversion type can be ''dB'', ''dBm'', ''dBu''.')
end

lin = 10.^((dB+fact)/10);