Table Of Contents

MT Resample (Complex Cluster) (G Dataflow)

Version:
    Last Modified: February 7, 2018

    Returns a complex-valued waveform and resamples and/or realigns the waveform based on the input parameters that you specify.

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    input complex waveform

    The complex baseband waveform data.

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    t0

    The trigger (start) time of the Y array.

    Default: 0.0

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    dt

    Time interval between data points in the Y array.

    Default: 1.0

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    Y

    The complex-valued time-domain data array. The real and imaginary parts of this complex data array correspond to the in-phase (I) and quadrature-phase (Q) data, respectively.

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    desired sample rate

    The desired sample rate of the output complex waveform data, in hertz (Hz). This value can be an integer or a non-integer multiple of the input data sample rate.

    Default: 1.00

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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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    initial sample offset

    The initial sample offset, in seconds. This positive value specifies the location in time of the first output point relative to the first input point.

    Default: 0.00

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    reset?

    A Boolean that determines whether the node continues to resample using the previous iteration states.

    TRUE The node resets the previous iteration states and restarts fractional resampling.
    FALSE The node continues to resample using the previous iteration states.

    Default: TRUE

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    flush buffers?

    A Boolean that determines whether the node forces out samples that are delayed because of the FIR filters used in the resampling algorithm. Set this parameter to TRUE during single-shot operations or during the last iteration of continuous operations.

    TRUE The node forces out samples that are delayed because of the FIR filters used in the resampling algorithm. The node destroys the internal states of the algorithms and you cannot perform continuous processing on the signal during subsequent iterations. If you set the flush buffers? parameter to TRUE, you must set the reset? parameter to TRUE on the subsequent iteration.
    FALSE The node does not force out samples that are delayed because of the FIR filters used in the resampling algorithm.

    Default: FALSE

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    output complex waveform

    The resampled complex baseband waveform data.

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    t0

    The trigger (start) time of the first value in the Y array.

    Default: 0.0

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    dt

    Time interval between data points in the Y array.

    Default: 1.0

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    Y

    The complex-valued time-domain data array. The real and imaginary parts of this complex data array correspond to the in-phase (I) and quadrature-phase (Q) data, respectively.

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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.

    Waveform Realignment

    To realign the input waveform in time, specify a non-zero value to the initial sample offset parameter. Positive offset values push the output complex waveform forward relative to the input complex waveform. Negative offset values are invalid.

    Waveform Resampling

    To resample a waveform, specify a desired sample rate that differs from the existing sample rate of the input complex waveform. To realign a waveform without changing its sample rate, specify a value for the desired sample rate parameter equal to the existing sample rate. To resample a waveform without changing the relative timing offset between the input and output complex waveforms, set the initial sample offset parameter to 0.

    Waveform Downsampling

    To downsample a waveform, ensure that the input signal is strictly bandlimited and follows the Nyquist criterion for the final sample rate. You can ensure this by low-pass filtering the input signal.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: Not supported

    Web Server: Not supported in VIs that run in a web application


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