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Pulse Train (G Dataflow)

Version:
    Last Modified: March 30, 2017

    Generates an array that concatenates a series of pulses according to a specific prototype pulse. This node constructs the pulse train using a specific interpolation method.

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    interpolation method

    Interpolation method used to construct the pulse train.

    When the sampling of the pulse train is not exactly in time with the prototype pulse sampling, this node uses the specified interpolation method to get the pulse train samples.

    Name Value Description
    Nearest 0 Uses the nearest interpolation method.
    Linear 1 Uses the linear interpolation method.
    Spline 2 Uses the spline interpolation method.
    Cubic Hermite 3 Uses the cubic Hermite interpolation method.

    Default: Linear

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    amplitude

    Amplitudes of each duplication of the prototype pulse in the output pulse train.

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    delay

    Delay of each duplication of the prototype pulse in the output pulse train.

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    prototype specification

    Prototype pulse of the output pulse train.

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    prototype pulse

    Prototype pulse, which starts at zero in the time axis.

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    dt of prototype pulse

    Sampling interval of the prototype pulse.

    Default: 0.1

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

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    dt

    Sampling interval of output pulse train.

    Default: 0.1

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    samples

    Number of samples of the output pulse train.

    If samples is less than 1, this node sets pulse train to an empty array and returns an error.

    Default: 1000

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    t0

    Timestamp of the output signal. If this input is unwired, this node uses the current time as the timestamp of the output signal.

    This input is available only if you configure this node to return a waveform.

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    pulse train

    Pulse train of samples.

    This output can return a waveform or an array of double-precision, floating-point numbers.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Algorithm for Generating the Pulse Train

    If the sequence Y represents pulse train, this node generates the pattern according to the following equation:

    y i = m = 0 M 1 A m * f ( i * Δ t D m )

    where

    • f is prototype pulse
    • Δt is dt of prototype pulse
    • Am is the mth element of amplitude
    • Dm is the mth element of delay, whose size must be equal to the size of amplitude

    If Di - Dj is less than the width of the prototype pulse for any i, j between 0 to M - 1, overlap occurs.

    The following figures show a prototype pulse and its pulse train.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: This product does not support FPGA devices


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