N-Sample Switch
R2026bSwitch between two inputs after specified number of sample periods
N-Sample Switch block
To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.
Libraries:
DSP System Toolbox /
Signal Management /
Switches and Counters
Description
The N-Sample Switch block outputs the signal connected to the top input port during the first N sample times after the simulation begins or the block is reset, where you specify N in the Switch count parameter. Beginning with output sample N+1, the block outputs the signal connected to the bottom input until the next reset event or the end of the simulation.
Ports
Input
Output
Parameters
Specify the number of sample periods, N, for which the output is connected to the top input before switching to the bottom input as a nonnegative integer.
Tunable: Yes
Select this check box to enable the Rst input port. The rate of the reset signal must be a positive integer that is a multiple of the rate of the data signal input.
This block supports triggered subsystems when you select the Reset input check box.
Reset the block's counter with the type of event at the Rst port.
You specify the triggering event in the Trigger type pop-up menu, and can be one of the following:
Rising edge— Triggers a reset operation when the Rst input does one of the following:Rises from a negative value to a positive value or zero
Rises from zero to a positive value, where the rise is not a continuation of a rise from a negative value to zero (see the following figure)
Falling edge— Triggers a reset operation when theRstinput does one of the following:Falls from a positive value to a negative value or zero
Falls from zero to a negative value, where the fall is not a continuation of a fall from a positive value to zero (see the following figure)
Either edge— Triggers a reset operation when theRstinput is aRising edgeorFalling edge(as described above).Non-zero sample— Triggers a reset operation at each sample time that theRstinput is not zero.
Dependencies
To enable this parameter, select the Reset input check box.
Tunable: Yes
Specify the sample period Ts for the block's counter as a positive scalar. The block switches inputs at t = Ts×(N+1).
You specify the sample period of the output in the Sample time parameter, that is, the output sample period is not inherited from the sample period of either input.
The block applies a zero-order hold at the input ports, so the value the block reads from a given port between input sample times is the value of the most recent input to that port.
Block Characteristics
Data Types |
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Direct Feedthrough |
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Multidimensional Signals |
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Variable-Size Signals |
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Zero-Crossing Detection |
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Programmatic Use: Add Block
To add the block programmatically, use the add_block function with one of these library block paths as the source.
"dspswit3/N-Sample Switch"
Example: add_block("dspswit3/N-Sample Switch","myModel/myBlock",MakeNameUnique="on")
Extended Capabilities
Version History
Introduced before R2006a
