Disclosed is a fuel metering unit for high-pressure pumps of fuel injection systems, whose leakproofness in zero delivery operation has been further improved and whose manufacture and assembly have been simplified. The present invention takes advantage of codes where most randomly selected data units fulfill the coding constraints. Switch operators facing down from the train may sense the note tiles to play the music so represented by the note tiles and track arranged in the staff and note configuration. The histogram creator is configured to create a histogram that represents an energy distribution of the electromagnetic waves, from the digital data generated by the first analog-to-digital converter.