yading@11: function Y = genspecsines (ploc, pmag, pphase, N) 
yading@11: % Compute a spectrum from a series of sine values 
yading@11: % iploc, ipmag, ipphase: sine locations, magnitudes and phases, N: size of complex     
yading@11: % spectrum; Y: generated complex spectrum of sines 
yading@11: Y =zeros(N,1); % initialize output spectrum 
yading@11: hN = N/2+1;                          % size of positive freq. spectrum 
yading@11: for i=1:length(ploc);             % generate all sine spectral lobes 
yading@11:   loc = ploc(i)-1;                      % location of peak (zero-based indexing),range ]0,hN-1[ 
yading@11:   if (loc<=1||loc>=hN-1) continue; end; % avoid frequencies out of range 
yading@11:   binremainder = round(loc)-loc; 
yading@11:   lb = [binremainder-4:binremainder+4]'; % main lobe (real value) bins to read 
yading@11:   lmag = genbh92lobe(lb)*10.^(pmag(i)/20); % lobe magnitudes of the complex exponential 
yading@11:   b = 1+[round(loc)-4:round(loc)+4]';      % spectrum bins to fill (1-based indexing) 
yading@11:   for m=1:9 
yading@11:       if (b(m)<1)                          % peak lobe crosses DC bin 
yading@11:           Y(2-b(m)) = Y(2-b(m)) + lmag(m)*exp(-1i*pphase(i)); 
yading@11:       elseif (b(m)>hN)                     % peak lobe croses Nyquist bin 
yading@11:           Y(2*hN-b(m)) = Y(2*hN-b(m)) + lmag(m)*exp(-1i*pphase(i)); 
yading@11:       else                                 % peak lobe in positive freq. range 
yading@11:           Y(b(m)) = Y(b(m)) + lmag(m)*exp(1i*pphase(i)) ... 
yading@11:                     + lmag(m)*exp(-1i*pphase(i))*(b(m)==1||b(m)==hN); 
yading@11:       end     
yading@11:   end 
yading@11:   Y(hN+1:end) = conj(Y(hN-1:-1:2));        % fill the rest of the spectrum 
yading@11: end  
yading@11: