Generates a telegraph (two-state) control signal with a (pseudo-)random distribution of change-points. The output is nominally scaled between 0 and 1 (for use as an "Amplitude" controller). NOTE: the sample rate at which this component is executed can be arbitrarily set via the "Sample-rate setting for Signal Generators and Input ASCII files" button (or the "Sample-Rate Setting" command under the "Edit" menu) on the toolbar, which is activated whenever the component is selected on the DrawingBoard. Equivalently, it can be set via the dialog box which (i) appears when the component is initially dragged on to the DrawingBoard or (ii) is activated using the right-mouse-button when the component is selected on the DrawingBoard. This procedure allows the component to either (i) enforce a user-determined sample rate on the downstream component(s), or (ii) to inherit the sample rate from the downstream component(s). Different signal generators can run at different sample rates on a DrawingBoard, as long as the rules of connectivity for multiple sample rates are adhered to (see the WaveWarp Users' Guide for more information.) The characteristics of the noise signal are adjustable via the Parameter Window, as summarised in the following table. Parameter Purpose "Bandwidth" slider Adjusts the bandwidth of the output noise signal. New change-points occur at pseudo-randomly generated intervals corresponding to the selected bandwidth. Between these change-points, the control signal output will retain its previous value. "Amplitude" slider Adjusts the amplitude of the output signal. Depending on the selected "Unmodulated amplitude range", the control signal output will be scaled either between -1 and 1, or between 0 and 1. "Enable modulation" checkbox If enabled, the "Unmodulated amplitude range" selection is automatically disabled, and the "Amplitude" slider becomes a "Depth" slider. The control signal ouput will be automatically scaled over the range from 0 to 1. The "Depth" determines the fraction of this range over which the noise sequence will be mapped. Maximum "Depth" (a value of 1) implies that the noise sequence will be mapped on to the entire range from 0 to 1, thereby maximising the signal variation. Minimum "Depth" (a value of 0) implies no mapping, thereby minimising the signal variation (i.e. constant output). An intermediate value, say 0.2, implies that the ouput of the noise sequence will be mapped on to the upper 20% of the output range, and so forth. Plot window Displays a representative portion of the output noise sequence, reflecting the time scaling due to the "Bandwidth" setting, and the amplitude scaling due to the "Amplitude", "Unmodulated amplitude range", and "Depth" settings.
Utilizes a pseudo-random number generator using the system clock as a "seed".
