Delay

class pathsim.blocks.delay.Delay(tau=0.001)

Bases: Block

Delays the input signal by a time constant ‘tau’ in seconds.

Mathematically this block creates a time delay of the input signal like this:

\[\begin{split}y(t) = \begin{cases} x(t - \tau) & , t \geq \tau \\ 0 & , t < \tau \end{cases}\end{split}\]

Note

The internal adaptive buffer uses interpolation for the evaluation. This is required to be compatible with variable step solvers. It has a drawback however. The order of the ode solver used will degrade when this block is used, due to the interpolation.

Note

This block supports vector input, meaning we can have multiple parallel delay paths through this block.

Example

The block is initialized like this:

#5 time units delay
D = Delay(tau=5)

Parameters:

tau (float) – delay time constant

_buffer

internal interpolatable adaptive rolling buffer

Type:

AdaptiveBuffer

reset()

Reset the blocks inputs and outputs and also its internal solver, if the block has a solver instance.

update(t)

Evaluation of the buffer at different times via interpolation.

Parameters:

t (float) – evaluation time

sample(t, dt)

Sample input values and time of sampling and add them to the buffer.

Parameters:

• t (float) – evaluation time for sampling

• dt (float) – integration timestep