function q30=HexInt32toQ30(HexString)

% Assume input is int32 but in Q30 format (30 decimal digits)

decunnum=hex2dec(HexString);
% Q30 format occurs as a multiplication of two Q15 numbers. 
% The result of the multiplication of two Q15 numbers is a Q30 number with
% two sign bits, one of which is redundant. Then, the procedure is first to
% remove the redundant sign bit (bit number 31 or MSB)
if(decunnum>=2^31);decunnum=decunnum-2^31;end

% now perform conversion to signed magnitude remembering that the input is
% int32 but assumed as Q30
if(decunnum<2^30)
    decsignum=decunnum;
else
    decsignum=decunnum-2^31;
end

% Get those Q30 30 decimal digits
q30=decsignum/2^30;