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Wave Generator (Triangle) (G Dataflow)

Version:
    Last Modified: March 15, 2017

    Generates a signal containing a triangle wave.

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    offset

    DC offset of the signal.

    Default: 0

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    reset phase

    A Boolean that determines the initial phase of the wave.

    True

    Sets the initial phase to phase in and sets the initial time to t0 if you configure this node to return a waveform.

    Sets the initial phase to phase in if you configure this node to return a double-precision, floating-point number or an array of double-precision, floating-point numbers.

    False

    Uses the values of phase out and t0 from when the node last executed as the initial phase and time of the wave if you configure this node to return a waveform.

    Uses the values of phase out from when the node last executed as the initial phase of the wave if you configure this node to return a double-precision, floating-point number or an array of double-precision, floating-point numbers.

    Default: False

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    amplitude

    Amplitude of the signal.

    Default: 1

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    frequency

    Frequency of the signal.

    Default: 10

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    phase in

    Initial phase in degrees of the signal when reset phase is True.

    Default: 0

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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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    sample rate

    Sample rate in samples per second.

    Default: 1000

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    samples

    Number of samples in the signal.

    This input is available only if you configure this node to return a waveform or an array of double-precision, floating-point numbers.

    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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    triangle wave

    Output triangle signal.

    This output can return the following data types:

    • Waveform
    • Double-precision, floating-point number
    • 1D array of double-precision, floating-point numbers
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    phase out

    Phase, in degrees, of the next sample of the output signal.

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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 Simulating a Triangle Wave

    If sequence Y represents a triangle wave, this node generates the pattern according to the following equation.

    y [ i ] = amplitude × tri ( phase [ i ] )

    for i= 0, 1, 2, ...,n-1

    where n is the number of samples. The node calculates tri(phase[ ]) according to the following table.

    pmod[i] tri(phase[i])
    0 pmod [ i ] < 90 2 × pmod [ i ] 180
    90 pmod [ i ] < 270 2 × ( 1 pmod [ i ] 180 )
    270 pmod [ i ] < 360 2 × ( pmod [ i ] 180 2 )

    where pmod[i] is phase[i] modulo 360 and phase[i] is:

    initial phase + frequency × 360.0 × i samples per second

    where initial phase is the initial phase of the wave.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: This product does not support FPGA devices


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