qtimer and signal

[valgaba]

Stream::Stream(QWidget *parent) :
    QObject(parent)
{
 
 Timer = new QTimer();
      connect(Timer, SIGNAL(timeout()), this, SLOT(Update()));
  Timer->start(30);
}
 
 
 
void Stream::Update(){
  ActualizarContadores();
 
       if (IsFinal(streamUltimo)){
         Timer->stop();
           if(!Timer->isActive ()){
 
               emit  Finish();
 
           }
 
      }
 
}

Stream::Stream(QWidget *parent) :
    QObject(parent)
{
 
 Timer = new QTimer();
      connect(Timer, SIGNAL(timeout()), this, SLOT(Update()));
  Timer->start(30);
}
 
 
 
void Stream::Update(){
  ActualizarContadores();
 
       if (IsFinal(streamUltimo)){
         Timer->stop();
           if(!Timer->isActive ()){
 
               emit  Finish();
 
           }
 
      }
 
}

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Depending on OS and Hardware Finish signal () is issued more than once, ie on windows vista once it is issued is the idea of ​​2 or more consecutive xp.
Is there a mechanism to ensure that the signal is issued only once?

thanks