Chapter 7. Signal Comments

In RASCHlab comments/annotations to specific time-points or time-periods in a signal are supported. When a file format support annotations (e.g. EDF+ or MIT/AHA), RASCHlab can handle (edit and/or delete) these annotations. Additionally, RASCHlab can add new comments. The "RASCHlab" comment can be specific for one channel or can hold for all channels.

To insert a comment, select the position (click on the wanted position in the signal window) or mark an area (click and move the mouse while holding the left mouse button down) and then press the '.' (period) key. Then the comment dialog box opens (see Figure 7-1) where the comment can be given. If the comment should be for one specific channel, the channel can be selected in the drop-down menu at the top of the dialog box.

Additionally to the comment text, you can set indicators. At the moment there are two possible indicators, "Noise" and "ignore data". These indicators can be used in programs which use libRASCH when the evaluation of the measurement is analyzed.

If you have to mark a larger area, scrolling through the signal while holding the left mouse button pressed, is sometimes cumbersome. Therefore another way to mark an area is available: (1) select the start position by clicking on the wanted position in the signal window, (2) press the ',' key, (3) navigate to the end postion, (4) press the '-' key. After the last step, the comment dialog box shows up and a comment can be set as described above.

Figure 7-2 shows the ecg with 4 comments. If a comment describes a period of time, this period is marked by a horizontal line with little vertical lines at the beginning and at the end. If the comment is for one specifc point in time, the position is marked by a small cross.

If you want to edit or delete a comment, you only need to double click on the comment text. Then the comment dialog box (Figure 7-1) appears. Here you can change the text of the comment or delete the comment ('Delete' button is on the lower left side in the dialog box).