Sound Board

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Input and Output\SoundBoard F5


Your Sound board driver details are shown at the top of this control panel. This information might be useful if you need to troubleshoot a sound problem.


Click Filter time constant

The click filter time constant is a compromise. You need to reduce clicking as the code tone switches on and off but too much filtering will give a blurred effect to the sound of the code. Experiment to find a setting that sounds good to you. A setting of 1ms is recommended. The small chart gives an indication of how each time constant affects the envelope waveform of a typical Morse code dot.



If you are planning to take a test soon then try to find out what tone frequency will be used on that test and select the closest one from the displayed options. If you are not planning to take a test soon then select the sound that you feel most comfortable with.


Code volume

This controls the volume of Morse code but does not affect any other sounds produced by NuMorse. If the Morse code output is too loud or quiet compared to the other sounds then use this control. If you want to adjust the volume of all NuMorse Pro sounds then use your soundboards physical volume control or your Windows Volume Control. The code volume control also affects NuMorse Pro generated audio files.


Real Morse Code.

This feature adds noise (QRN) and fading (QSB) to the code output so that the signal sounds more like what you would hear on a real radio. Real Morse Code is best used in Continuous play mode where the supply of code characters is continuous. In Drill mode the noise stops while NuMorse Pro waits for your input and this can be distracting. The same applies to modes which use characters from the keyboard where there can be long pauses between characters.


A possible problem with Real Morse Code.

If you hear pauses and gaps in the noise or code then this means that you have a sound board with an appreciable switch-on time. In NuMorse Pro each code character is sent as a separate sound sample. Some soundboards cannot seamlessly stitch together these samples into a continuous sequence without a short period of silence. Without background noise this is not a problem since the hand-over from one sample to the next occurs during the inter-character silence. Suggestions for a fix:


Make sure you have the correct and up to date soundboard drivers.

If you have a slower PC (133MHz or less) then try closing any programs not in use.


Testing here suggests that Win 98 and later gives better results than Win 95.