MATLAB:

The overall time-base of the scope can be adjusted by changing the WaveWarp-MATLAB data buffer length via the "Communication" button. Once set, this establishes the maximum time-base for the frame (i.e. corresponding to the set length). The time-base can then be reduced arbitrarily from this level using the "Zoom X" functionality described below.

NOTE: This component requires MATLAB (v5.3 or later), available separately from The MathWorks, Inc. (www.mathworks.com)

Parameter	Purpose
Channel mode selector	Selects the desired display mode (applicable to stereo scopes only). The options are "left" (when only the left channel is displayed full-size), "right" (when only the right channel is displayed full-size), or "both" (when both channels are displayed simultaneously, each occupying half of the split-screen plot window).
"Zoom Y" button	Toggles the zoom state of the scope Y-axis. If selected, the scope background color changes to yellow, and the Y-axis can then be zoomed to an arbitrary level using the mouse. The zoom functionality is built around the MATLAB "zoom" function (type "help zoom" at the MATLAB prompt for more information). Accordingly, it works as follows: when zoom is on, click the left mouse button to zoom in on the point under the mouse. Click the right mouse button to zoom out. Each time you click, the Y-axis limit will be changed by a factor of two (in or out). You can also click and drag to zoom into an area. Double clicking zooms out to the original (un-zoomed) setting. Note: for stereo scopes in "both" mode (i.e. split screen display), the zoom functionality only affects the the "active" scope (i.e. either the left or the right -- not both). To make either the left or right scope the "active" one, double click on it when zoom is NOT activated.
"Zoom X,Y" button	Toggles the zoom state of the scope X- and Y-axes simultaneously. Functionality is the same as for the "Zoom Y" button except both X- and Y-axes are affected by the actions.
"Zoom X" button	Toggles the zoom state of the scope X-axis. Functionality is the same as for the "Zoom Y" button except that the X- (rather than the Y- ) axis is affected by the actions.
"Zoom Out" button	Restores the scope to the un-zoomed state, though leaving the zoom button(s) activated.
"Zoom Out" button	Restores the scope to the un-zoomed state and de-activates all zoom buttons.
"Ymax:" and "Ymin:" popups and data entry dialogs	Enable adjustment of the overall Y-axes limits. The popups contain convenient presets which are automatically mirrored across the X-axis (i.e. the Ymin value is automatically set to the negative of the Ymax selection, and vice versa). The data entry dialogs can be used to override the popup presets with arbitrary values and without enforcing symmetry across the X-axis.
The "Trigger" control panel	Enables the scope(s) to be triggered based on the input signal level. The available choices of triggering method are as follows: Off (Free Run): triggering is de-activated. The data simply flows continuously from WaveWarp to MATLAB. Every frame: triggering is applied to every frame of data. Specifically, data transmission for a given frame is only activated once the absolute value of the input signal amplitude exceeds the level set in the "Threshold" popup selector. This "test" is applied before starting each frame. 1st Frame: triggering is applied to the first frame of data only. Specifically, data transmission for the first frame is only activated once the the absolute value of the input signal amplitude exceeds the level set in the "Threshold" popup selector. Thereafter, the data flows continuously as if in "Free Run" mode. Manual Arm: triggering is applied to every frame of data. Moreover, the trigger must be manually "armed" each time by pushing the green "Arm" button which automatically appears when this option has been selected. After the trigger has been armed, the data transmission for a given frame is only activated once the the absolute value of the input signal amplitude exceeds the level set in the "Threshold" popup selector. This "test" is applied after the manual arming of each frame. 1st Manual Arm: triggering is applied to the first frame of data only. Moreover, the trigger must be manually "armed" by pushing the green "Arm" button which automatically appears when this option has been selected. After the trigger has been armed, the data transmission is only activated once the the absolute value of the input signal amplitude exceeds the level set in the "Threshold" popup selector. Thereafter, the data flows continuously as if in "Free Run" mode. Note: for stereo scopes, the reference input signal used in the trigger "test" depends which display mode is selected. Specifically, if "left channel" or "right channel" display mode is active, then the respective left or right channel signal is used. If "both channels" are selected, the average of the absolute values of the left and right signals are used.
The "Record capture" control panel	If activated (by selecting the associated checkbox when the DrawingBoard is stopped), the long-term data capture feature is enabled, whereby arbitrarily long sequences of data may be stored by the scope then delivered to the MATLAB workspace under the name assigned in the "Workspace export: name of variable:" dialog. The length of the capture (measured in numbers of frames, and displayed in seconds) is adjustable via the "Length (frames):" popup selector and data entry dialog (the data entry dialog overrides the value selected in the popup). Once the capture is completed, the data is automatically sent to the workspace. If the Drawing Board is still running thereafter, the "New capture ?" button is enabled, allowing a new capture to be initiated. Caution: if a new capture is initiated, the results of the previous capture will be overwritten in the workspace unless a different variable name is selected. Note: the long-term capture fully respects the triggering action i.e., it will be interrupted whenever the trigger test is not met. This will lead to discontinuous captures when triggering is enabled.
"Bypass" button	If selected, stops the transmission of data from WaveWarp to MATLAB. All scope functionality (including graphical output and data record capture) is suspended. This is particularly useful for temporarily disabling the scope in order to alleviate the CPU burden (without having to disconnect the component).

Algorithm

• Audio To MATLAB
• Control To MATLAB
• MATLAB 2D Control Tablet
• MATLAB Control In-The-Loop
• MATLAB FIR Filter
• MATLAB IIR Filter
• MATLAB In The Loop
• MATLAB To Audio
• MATLAB To Control
• MATLAB Wave Player

• None