Table Of Contents
Wave Generator (Arbitrary) (G Dataflow)
Generates a signal containing an arbitrary wave.
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wave table
One cycle of the waveform used in creating the output arbitrary wave.
reset phase
The initial phase of the arbitrary 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
amplitude
Amplitude of the arbitrary wave.
Default: 1
frequency
Frequency of the arbitrary wave in normalized units of cycles/sample.
Default: 10
phase in
The initial phase, in degrees, of the arbitrary wave.
phase in is valid only when you set reset phase to True.
Default: 0
interpolation
The type of interpolation this node uses to generate the arbitrary wave.
| Name | Value | Description |
|---|---|---|
| None | 0 | No interpolation. |
| Linear | 1 | Linear interpolation. |
Default: None
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.
Default: No error
sample rate
Sample rate in samples per second.
Default: 1000
samples
Number of samples in the signal.
samples must be greater than 0. Otherwise, this node returns an error.
This input is available when you configure this node to return a waveform or an array of double-precision, floating-point numbers.
Default: 1000
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.
arbitrary wave
phase out
Phase of the signal in degrees.
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.
Algorithm for Generating an Arbitrary Wave
If the sequence Y represents arbitrary wave, this node generates the sequence according to the following equation:
for i = 0, 1, 2, …, n - 1
where a is amplitude and n is samples.
This node calculates using the following equation:
where
- m is the size of wave table
- if interpolation = 0 (no interpolation)
- WT(x) is the linearly interpolated value of and if interpolation = 1 (linear interpolation)
- phasei = initial_phase + frequency
- initial_phase is phase in if reset phase is True
- initial_phase is the phase out from the previous execution of this instance of the node if reset phase is False
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application