diff --git a/libm65/analytic.f90 b/libm65/analytic.f90
new file mode 100644
index 000000000..1a84ca9e2
--- /dev/null
+++ b/libm65/analytic.f90
@@ -0,0 +1,24 @@
+subroutine analytic(d,npts,nfft,s,c)
+
+! Convert real data to analytic signal
+
+  real d(npts)
+  real s(npts)
+  complex c(npts)
+
+  nh=nfft/2
+  fac=2.0/nfft
+  c(1:npts)=fac*d(1:npts)
+  c(npts+1:nfft)=0.
+  call four2a(c,nfft,1,-1,1)               !Forward c2c FFT
+
+  do i=1,nh
+     s(i)=real(c(i))**2 + aimag(c(i))**2
+  enddo
+
+  c(1)=0.5*c(1)
+  c(nh+2:nfft)=0.
+  call four2a(c,nfft,1,1,1)                !Inverse c2c FFT
+
+  return
+end subroutine analytic
diff --git a/libm65/db.f90 b/libm65/db.f90
new file mode 100644
index 000000000..aa58f43f1
--- /dev/null
+++ b/libm65/db.f90
@@ -0,0 +1,5 @@
+real function db(x)
+  db=-99.0
+  if(x.gt.1.259e-10) db=10.0*log10(x)
+  return
+end function db
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 08534b213..7aa60d349 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1,4 +1,4 @@
-//-------------------------------------------------------------- MainWindow
+//------------------------------------------------------------- MainWindow
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include "devsetup.h"