Add DCS tone polarity

standard.tex

@@ -653,7 +653,7 @@ Uplink and downlink tones are encoded in 3 bytes. CTCSS and DCS are both support
   \hline
   23 & 22 & 21 & 20 & 19 & 18 & 17 & 16 & 15 & 14 & 13 & 12 & 11 & 10 & 9 & 8 & 7 & 6 & 5 & 4 & 3 & 2 & 1 & 0 \\
   \hline
-  $U_e$ & 0 & \multicolumn{10}{|c|}{$U_v$} & $D_e$ & 0 & \multicolumn{10}{|c|}{$D_v$} \\
+  $U_e$ & $U_p$ & \multicolumn{10}{|c|}{$U_v$} & $D_e$ & $U_p$ & \multicolumn{10}{|c|}{$D_v$} \\
   \hline
 \end{tabular} \\
 \newline \noindent
@@ -661,6 +661,15 @@ Where:
 
 \begin{itemize}
 \item $U_e$ and $D_e$ represent the encoding type (0 for CTCSS, 1 for DCS)
+\item $U_p$ and $D_p$ represent the DCS tone polarity
+  \begin{itemize}
+  \item If the type is CTCSS, this value is unused and must be set to 0
+  \item If the type is DCS, then
+    \begin{itemize}
+    \item If the polarity is normal, this value is set to 0
+    \item If the polarity is reversed, this value is set to 1
+    \end{itemize}
+  \end{itemize}
 \item $U_v$ and $D_v$ represent the tone value
   \begin{itemize}
   \item If the type is CTCSS, the value is an unsigned integer from the CTCSS table (see below)