Fix bug in ptSrcFieldTD.m that would screw dimension when there is only one source present

Sound Fields/MATLAB/Functions/ptSrcFieldTD.m

@@ -170,7 +170,7 @@ function [rSig, rSigMean, rSigMtx, rSigMtxMean, Q] = ptSrcFieldTD(sPos, rPos, fs
     end
 
     % Sum source signals at each receiver position
-    rSig = squeeze(sum(rSigMtx, 3));
+    rSig = reshape(sum(rSigMtx, 3), size(rSigMtx, 1), size(rSigMtx, 2), size(rSigMtx, 4));
 
     % ====================================================
     % Calculate output arguments