N-Sample Enable (DSP Blockset)

Output ones or zeros for a specified number of sample times.

Library

Switches and Counters, in General DSP; DSP Sources

Description

The N-Sample Enable block outputs the inactive value (zero or one, whichever is not selected in the Active parameter pop-up) during the first N sample times, where N is the Trigger count value. Beginning with output sample N+1, the block outputs the active value (one or zero, whichever is selected in the Active level parameter pop-up) until a reset event or the end of the simulation.

The Reset input check box enables the Trig input port. At any time during the count, a trigger event at the input port resets the counter to its initial state. The triggering event is specified by the Trigger type pop-up menu, and can be one of the following:

Rising edge triggers execution of the block when the trigger input rises from a negative value to zero or a positive value, or from zero to a positive value.
Falling edge triggers execution of the block when the trigger input falls from a positive value to zero or a negative value, or from zero to a negative value.
Either edge triggers execution of the block when either a rising or falling edge (as described above) occurs.

Dialog Box

Trigger count: The number of samples for which the block outputs the active value.
Active level: The value to output after the first N sample times, 0 or 1.
Reset input: Enables the Trig input port.
Trigger type: The type of event that triggers a reset.
Sample time: The sample period, T_s, for the block's counter. The block switches from the active value to the inactive value at t=T_s*(N+1).