Waveview Data Selection

To select data and initiate an automated analysis, follow the steps:

• display the required data stream in a WaveView window, adjusting time scaling for required time span.
• When the desired amount of data is received, switch to pause mode, by pressing the Pause button in the WaveView window.
• Select the exact data to be transferred by dragging the cursor over the data stream WHILST HOLDING THE SHIFT OR CTRL KEY. The readout in the top-left corner of the highlighted box indicates the number of samples that will be used.
• When the mouse button is released, a pop-up menu will appear giving the user a choice of actions for the selected data.

The pop-up menu has an option to "Save...". This option allows the user to save the selected data in a file or files using one of the supported formats, in a directory of their choice. Additionally, if the chosen file format supports a blocked structure, the user can choose to have all data in a single file.
This option is independent of Scream's normal recording functions, and can be used at any time, whether the main Scream recording is active or not, and independent of the recording format.

The pop-up menu also has a default option "scrfft", which will initiate the Matlab Extension feature.

In all cases except the "Save..." option, the samples are saved as ASCII in files in the standard ‘temp’ directory. By default, each stream is saved in a file called "samplesX.txt" where X is an incrementing number. In addition, a header file "scrhdr.txt" is saved with information about the data in the samplesX.txt files (start time, complete path and file name, sample rate, System ID and Stream ID).

The pop-up menu can be customised by the user by editing the scream.ini file. The customisation allows the user to add options to the menu. To modify the menu, edit the [custom] section of the ini file as follows:

[custom]
SelectionMenu=scrfft,scrfft_timing,scrfft_psdms

That is, a list of filenames separated by commas. Each filename will appear as an option in the pop-up menu. When the user selects that option, Scream will attempt two actions:

1. Scream will attempt to locate and run an executable with the same name as the menu option. If this fails :-
2. Scream will attempt to launch matlab, and call the function from within matlab, in accordance with the Matlab Extension.