Detect true duration on input and construct output true duration based on output type
Simulink Design Verifier
Temporal Operators Terminology
True duration of a signal — Consecutive time steps during which a signal is true
Length of the true duration of the signal — The number of time steps that constitute the true duration
Input detection phase — The phase that is complete at the final time step of the expected length of the input true duration
Output construction phase— The phase when the block constructs a true duration at the output based on the output type of the block
Delay duration — The number of time steps of delay after input detection, after which the output signal is true
The inputs and outputs of the Detector block are of Boolean type.
On input detection, the Detector block constructs an output signal based on one of the two output types that you specify:
Delayed Fixed Duration—After the input detection is complete and after an optional delay, the output signal becomes
truefor a fixed number of time steps. The true duration of the output is independent of the input.
Synchronized—In the final time step of the input detection, the output becomes
trueas long as the input signal continues to be
true. The true duration of the output varies and is synchronized with the true duration of the input.
- External reset
Specify whether the block can be reset to the start of the input detection by an external Boolean reset signal.
- Output type
Delayed Fixed Duration(the default) to specify a fixed true duration length for the output after an optional delay. Select
Synchronizedto synchronize the output true duration with that of the input.
- Time steps for input detection
Length of the true duration for input detection (minimum is
- Time steps for delay (optional)
Delayed Fixed Duration, optionally specify the length of the delay duration, after which the output becomes true.
- Time steps for output duration
Delayed Fixed Duration, specify the length of the output true duration (minimum is
In the following examples, use a sample time of
Delayed Fixed Duration
In this example, with Output type set to
Fixed Duration, the input detection phase does not continue
during the output signal construction. The following block parameters
for the Detector block are set as follows:
Time steps for input detection =
Time steps for delay (optional) =
Time steps for output duration =
Scope 1 shows a scenario where the second
is not detected, because some of the
steps occur during output construction.
However, the second
true duration in Scope
2 is detected because the remaining
after the output construction satisfies the number of steps required
for input detection.
In this example, with the Output type set
Synchronized and Time steps
for input detection set to
the output becomes
true in the final step of input
detection. The output continues to be true as long as the input signal
Scope 1 shows that the output becomes true in the second time
step, which is the final time step of the input detection phase. When
the number of time steps for input detection is set to
the output is identical to the input, as you can see in Scope 2.