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Distortion Measurements (SINAD) (G Dataflow)

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Last Modified: August 28, 2017

Performs a full Signal in Noise and Distortion (SINAD) analysis, including measuring the fundamental frequency tone and returning the fundamental frequency and SINAD level in dB.

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export mode

Source of the signal and spectrum to export.

Name Description
none Uses the fastest computation.
input signal Exports the input signal only.
detected signal Exports a single tone.
residual signal Exports a signal minus the tone.

Default: none

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signal

The input signal.

This input can be a waveform or an array of waveforms.

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center frequency

Center frequency to use in the frequency-domain search for the fundamental tone frequency.

Default: -1

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frequency width

Frequency width, as a percentage of the sampling rate, for the frequency-domain search for the fundamental tone frequency.

Default: 5

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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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exported spectrum

Spectrum of the exported signal.

This output can return a cluster or a 1D array of clusters.

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f0

Start frequency, in Hz, of the spectrum.

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df

Frequency resolution, in Hz, of the spectrum.

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spectrum

Computed spectrum.

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exported signal

Waveform of the exported signal.

This output can return a waveform or a 1D array of waveforms.

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fundamental frequency

Detected fundamental frequency resulting from searching the frequency domain.

This output can return a double-precision, floating-point number or a 1D array of double-precision, floating-point numbers.

Use the center frequency and frequency width to set the frequency domain search range. All harmonics are measured at integer multiples of this fundamental frequency.

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SINAD

Measured Signal in Noise and Distortion (SINAD) expressed in dB.

This output can return a double-precision, floating-point number or a 1D array of double-precision, floating-point numbers.

This output is the ratio of the RMS energy of the input signal to the RMS energy of the input signal less the energy in the fundamental. To compute the measured total harmonic distortion plus noise in dB, negate the SINAD in dB

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THD plus noise

Measured total harmonic distortion (THD) plus noise.

This output can return a double-precision, floating-point number or a 1D array of double-precision, floating-point numbers.

This output is the ratio of the RMS energy of the input signal less the energy in the fundamental to the RMS energy of the input signal. To compute this output as a percentage, multiply the value by 100.

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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.

Where This Node Can Run:

Desktop OS: Windows

FPGA: This product does not support FPGA devices

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


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