diff --git a/ifcs2018_processing.tex b/ifcs2018_processing.tex
index 535bfea..293df9e 100644
--- a/ifcs2018_processing.tex
+++ b/ifcs2018_processing.tex
@@ -15,7 +15,7 @@ to oscillator metrology}
 
 \author{\IEEEauthorblockN{A. Hugeat\IEEEauthorrefmark{1}\IEEEauthorrefmark{2}, J. Bernard\IEEEauthorrefmark{2},
 G. Goavec-M\'erou\IEEEauthorrefmark{1},
-P.-Y. Bourgeois\IEEEauthorrefmark{1}, J.-M Friedt\IEEEauthorrefmark{1}}
+P.-Y. Bourgeois\IEEEauthorrefmark{1}, J.-M. Friedt\IEEEauthorrefmark{1}}
 \IEEEauthorblockA{\IEEEauthorrefmark{1}FEMTO-ST, Time \& Frequency department, Besan\c con, France }
 \IEEEauthorblockA{\IEEEauthorrefmark{2}FEMTO-ST, Computer Science department DISC, Besan\c con, France \\
 Email: \{pyb2,jmfriedt\}@femto-st.fr}
@@ -80,11 +80,23 @@ We select FIR filter for their unconditional stability and ease of design. A FIR
 by a set of weights $b_k$ applied to the inputs $x_k$ through a convolution to generate the outputs $y_k$
 $$y_n=\sum_{k=0}^N b_k x_{n-k}$$
 
-As opposed to an implementation on a general purpose processor in which word size is defined by the 
+As opposed to an implementation on a general purpose processor in which word size is defined by the
 processor architecture, implementing such a filter on an FPGA offer more degrees of freedom since
 not only the coefficient values and number of taps must be defined, but also the number of bits defining
 the coefficients and the sample size.
 
+Ideally the coefficient are expressed as floating point value but this notation isn't a efficient way to
+work with FPGA. Instead we prefer convert this floating point values into integer values. However this
+conversion result in some precision loss. Actually as show figure \ref{float_vs_int}, we see that we aren't
+need too coefficients or too sample size. If we have lot of coefficients but a small sample size,
+the first and last are equal to zero. But if we have too sample size for few coefficients that not improve the quality.
+
+\begin{figure}[h!tb]
+\includegraphics[width=\linewidth]{images/float-vs-integer.pdf}
+\caption{Illistration of coefficients choice impact}
+\label{float_vs_int}
+\end{figure}
+
 \section{Filter optimization}
 
 A basic approach for implementing the FIR filter is to compute the transfer function of
@@ -206,4 +218,3 @@ fruitful discussions.
 \bibliographystyle{IEEEtran}
 \bibliography{references}
 \end{document}
-
diff --git a/images/float-vs-integer.eps b/images/float-vs-integer.eps
new file mode 100644
index 0000000..c6b3cf9
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