DSP Blockset

N-Sample Enable

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

Library
DSP Sources,

Signal Management / Switches and Counters

Description

The N-Sample Enable block outputs the inactive value (0 or 1, whichever is not selected in the Active level parameter) 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 (1 or 0, whichever is selected in the Active level parameter) until a reset event occurs or the simulation terminates.

The Reset input check box enables the Rst 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 the reset 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 the reset 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 the reset when either a rising or falling edge (as described above) occurs.

The output is always sample-based.

Dialog Box

Trigger count

The number of samples for which the block outputs the active value. Tunable.

Active level

The value to output after the first N sample times, 0 or 1. Tunable.

Reset input

Enables the Rst input port.

Trigger type

The type of event that triggers a reset when the Rst port is enabled. Tunable.

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).

See Also

Counter	DSP Blockset
N-Sample Switch	DSP Blockset

See Creating Signals Using Signal Generator Blocks for related information.

Multiport Selector

N-Sample Switch