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Settings

The settings dialog can be reached from the tool bar or via the menu view→Settings…. The settings are groupt in three tabs: General Settings, Audio Settings and CUL Settings.

General Settings

Field	Explanation
Signal Source	Select which source of data signal to use
Audio	Use audio input as signal source
CUL	Use a CUL-device as signal source
Pronto Settings	Pronto is a format for describing raw pulse signals. These settings affect how this format is generated
Frequency	Pronto encoding contains the IR modulation frequency. We have no decoders that actually detect this frequency, so here we specify which to use. Default is 40000 Hz
Lead Out Time	The Pronto decoder needs to know how long silence should be counted as the end of a signal. If the protocol has very long pulse spaces within a message this may have to be extended from the default 9000 micro seconds.

Audio Settings

Field	Explanation
Audio Source	In this group you specify which audio source to take the input signal from
Source	Here you select which sound card and input device to use
Mono	Only one channel used. This is usually the best setting when using the microphone input, since most sound cards only have one microphone channel
Left Channel	Use the Left audio channel
Right Channel	Use the Right audio channel
Flank Detection	The internal flank detector tries to recreate the digital pulses in the analog signal by finding the rising and falling edges (flanks). These are the configuration settings for this module
Apply … Filter	If the input signal contains a lot of noise, a digital low pass filter can be applied to the signal before flank detection. This Smooths out the signal. You may have to increase Flank Length when this is used
Flank Swing	The hight of a change needed to count as a flank. Use about half the actual height observed in the raw view
Flank Length	How many samples needed to perform the flank
Flank Holdoff	How many samples after a detected flank we should wait until trying to find a new one. Can usually be set to 1
Burst Length comp.	Many receivers of RF and IR signals are a bit “slow” in detecting the start of a mark pulse (burst). The result is that mark pulses are detected as a bit shorter then they are and space pulses a bit longer. This setting can compensate for this behavior

The Flank Detection Algorithm can be described by this picture: