NVGate FFT - Revision history

VBoyet: /* FFT analysis */

2025-05-19T14:20:17Z

FFT analysis

← Older revision		Revision as of 16:20, 19 May 2025
Line 597:		Line 597:
	* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%.<br>		* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%.<br>

	Note: When the overlap exceeds 99%, NVGate does not inform if you lost real-time. At this moment, NVGate is performing as fast as it can by taking the last trigger block than can be ~~compute~~ by the processor.		Note: When the overlap exceeds 99%, NVGate does not inform if you lost real-time. At this moment, NVGate is performing as fast as it can by taking the last trigger block than can be computed by the processor.
	* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.		* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.
	* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.		* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.

VBoyet: /* FFT analysis */

2025-05-19T14:18:04Z

FFT analysis

← Older revision		Revision as of 16:18, 19 May 2025
Line 597:		Line 597:
	* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%.<br>		* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%.<br>

	Note: When the overlap exceeds 99%, NVGate does not inform if you lost real-time. At this moment, NVGate is performing as fast as it can by taking the last trigger block than can be compute by the processor.		Note: When the overlap exceeds 99%, NVGate does not inform if you lost real-time. At this moment, NVGate is performing as fast as it can by taking the last trigger block than can be compute by the processor.
	* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.		* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.
	* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.		* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.

VBoyet: /* FFT analysis */

2025-05-19T14:17:57Z

FFT analysis

← Older revision		Revision as of 16:17, 19 May 2025
Line 595:		Line 595:
	* '''Range''': the FFT plug-in frequency range. The analyzer sampling frequency divided by 2.56 limits this range, and the minimum is obtained by dividing this limit by 50000. For example, if the analyzer sampling frequency is 51,2kS/s, then the max range is 20 kHz and the min is 400mHz. In post analysis mode, the Max Bandwidth setting from the Player plug-in provides the analyzer sampling frequency by multiplying the value by 2.56 (ex: if max bandwidth = 20 kHz then the analyzer sampling frequency is 51.2kS/s), otherwise, the analyzer sampling frequency is provided by the input sampling setting from the Front end plug-in input setting sub-module.		* '''Range''': the FFT plug-in frequency range. The analyzer sampling frequency divided by 2.56 limits this range, and the minimum is obtained by dividing this limit by 50000. For example, if the analyzer sampling frequency is 51,2kS/s, then the max range is 20 kHz and the min is 400mHz. In post analysis mode, the Max Bandwidth setting from the Player plug-in provides the analyzer sampling frequency by multiplying the value by 2.56 (ex: if max bandwidth = 20 kHz then the analyzer sampling frequency is 51.2kS/s), otherwise, the analyzer sampling frequency is provided by the input sampling setting from the Front end plug-in input setting sub-module.
	* '''Resolution:''' This is a fixed setting, for information only. It displays the frequency span between two points of a spectral result. The FFT resolution is obtained by dividing the FFT frequency range by the resolution minus 1. For example if the FFT Range is 20 kHz and the resolution is 401 lines, then the frequency span is: 20000 / (401 - 1) = 20000 / 400 = 50Hz.		* '''Resolution:''' This is a fixed setting, for information only. It displays the frequency span between two points of a spectral result. The FFT resolution is obtained by dividing the FFT frequency range by the resolution minus 1. For example if the FFT Range is 20 kHz and the resolution is 401 lines, then the frequency span is: 20000 / (401 - 1) = 20000 / 400 = 50Hz.
	* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%. When the overlap exceeds 99%, NVGate ~~cannot handle~~ real-time. At this moment, NVGate is performing as fast as it can.		* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%.<br>

			Note: When the overlap exceeds 99%, NVGate does not inform if you lost real-time. At this moment, NVGate is performing as fast as it can by taking the last trigger block than can be compute by the processor.
	* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.		* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.
	* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.		* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.

VBoyet at 11:52, 19 May 2025

2025-05-19T11:52:02Z

← Older revision		Revision as of 13:52, 19 May 2025
Line 595:		Line 595:
	* '''Range''': the FFT plug-in frequency range. The analyzer sampling frequency divided by 2.56 limits this range, and the minimum is obtained by dividing this limit by 50000. For example, if the analyzer sampling frequency is 51,2kS/s, then the max range is 20 kHz and the min is 400mHz. In post analysis mode, the Max Bandwidth setting from the Player plug-in provides the analyzer sampling frequency by multiplying the value by 2.56 (ex: if max bandwidth = 20 kHz then the analyzer sampling frequency is 51.2kS/s), otherwise, the analyzer sampling frequency is provided by the input sampling setting from the Front end plug-in input setting sub-module.		* '''Range''': the FFT plug-in frequency range. The analyzer sampling frequency divided by 2.56 limits this range, and the minimum is obtained by dividing this limit by 50000. For example, if the analyzer sampling frequency is 51,2kS/s, then the max range is 20 kHz and the min is 400mHz. In post analysis mode, the Max Bandwidth setting from the Player plug-in provides the analyzer sampling frequency by multiplying the value by 2.56 (ex: if max bandwidth = 20 kHz then the analyzer sampling frequency is 51.2kS/s), otherwise, the analyzer sampling frequency is provided by the input sampling setting from the Front end plug-in input setting sub-module.
	* '''Resolution:''' This is a fixed setting, for information only. It displays the frequency span between two points of a spectral result. The FFT resolution is obtained by dividing the FFT frequency range by the resolution minus 1. For example if the FFT Range is 20 kHz and the resolution is 401 lines, then the frequency span is: 20000 / (401 - 1) = 20000 / 400 = 50Hz.		* '''Resolution:''' This is a fixed setting, for information only. It displays the frequency span between two points of a spectral result. The FFT resolution is obtained by dividing the FFT frequency range by the resolution minus 1. For example if the FFT Range is 20 kHz and the resolution is 401 lines, then the frequency span is: 20000 / (401 - 1) = 20000 / 400 = 50Hz.
	* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%.		* '''Overlap''': Defines the amount of overlap of input signals between two successive FFT computations, from 0% to 99.99%. When the overlap exceeds 99%, NVGate cannot handle real-time. At this moment, NVGate is performing as fast as it can.
	* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.		* '''Number of lines''': The FFT number of analyzed lines. There are seven possibilities: 101, 201, 401, 801, 1601, 3201 or 6401 lines.
	* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.		* '''Trigger Frequency:''' This setting is only available when the ''FFT x/Average/Domain ''setting is "Synchronous". The value can be chosen from the FFT Frequency range; this frequency is the phase reference: each FFT block is recomputed so that the phase of the frequency chosen is 0.

Lmagimel at 09:47, 26 November 2024

2024-11-26T09:47:03Z

← Older revision		Revision as of 11:47, 26 November 2024
Line 1:		Line 1:
	[[category:NVGate]]		[[category:NVGate]]
			[[category:WikiOros]]
	[[Image:Reports_Tools_Ribbons_391.png\|framed]]		[[Image:Reports_Tools_Ribbons_391.png\|framed]]
	[[image:ASB_FFT.png\|right]]		[[image:ASB_FFT.png\|right]]

Lmagimel: Lmagimel moved page NVGate FFT Analyzer to NVGate FFT

2022-04-04T07:28:55Z

Lmagimel moved page NVGate FFT Analyzer to NVGate FFT

← Older revision	Revision as of 09:28, 4 April 2022
(No difference)

Lmagimel at 08:03, 15 March 2022

2022-03-15T08:03:28Z

← Older revision		Revision as of 10:03, 15 March 2022
Line 2:		Line 2:
	[[Image:Reports_Tools_Ribbons_391.png\|framed]]		[[Image:Reports_Tools_Ribbons_391.png\|framed]]
	[[image:ASB_FFT.png\|right]]		[[image:ASB_FFT.png\|right]]
	A spectrum analyzer is an instrument used to characterize signals in the frequency domain.<br>		A [[FFT_Spectrum_Analyzer_Multipurpose\|spectrum analyzer]] is an instrument used to characterize signals in the frequency domain.<br>

	Frequency-domain displays show a parameter (usually amplitude) versus frequency. A spectrum analyzer takes an analog input signal (a time domain signal) and converts it to the frequency domain. The resulting spectrum measurement shows the energy of each frequency component at each point along the frequency spectrum.<br>		Frequency-domain displays show a parameter (usually amplitude) versus frequency. A spectrum analyzer takes an analog input signal (a time domain signal) and converts it to the frequency domain. The resulting spectrum measurement shows the energy of each frequency component at each point along the frequency spectrum.<br>

Lmagimel: /* Display available results */

2022-02-14T13:16:20Z

Display available results

Show changes

Credaelli at 15:51, 7 January 2022

2022-01-07T15:51:20Z

← Older revision		Revision as of 17:51, 7 January 2022
Line 37:		Line 37:
	{\|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center"		{\|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center"
	\|'''Type'''		\|'''Type'''
	~~\|'''Description'''~~
	~~\|'''Available if'''~~
	\|'''Size'''		\|'''Size'''
	\|'''Dimension'''		\|'''Dimension'''
Line 47:		Line 45:
	\|-		\|-
	\|Filtered signal		\|Filtered signal
	~~\|Display the input time signal after filtering.~~
	~~\|a filter is selected in the FFT x/Channel x/Input filter setting~~
	\|256 pt		\|256 pt
	\|2D		\|2D
Line 57:		Line 53:
	\|-		\|-
	\|Triggered block		\|Triggered block
	~~\|Displays the signal after being triggered by the event selected with the ''FFT x/Trigger/Trigger ''setting''.''~~
	\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 64:		Line 58:
	\| Yes		\| Yes
	\| FFT		\| FFT

	~~\|}<br clear="all">~~

	~~''Results below are calculated from the triggered block results. The refresh & computation rate depend on the PC to analyzer connection availability (non real-time results)''~~

	~~{\|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center"~~
	~~\|'''Type'''~~
	~~\|'''Description'''~~
	~~\|'''Available if'''~~
	~~\|'''Size'''~~
	~~\|'''Dimension'''~~
	~~\|'''Domain'''~~
	~~\|'''Save'''~~
	~~\|'''Option'''~~

	\|-		\|-
	\|Trigger Shaftview		\|Trigger Shaftview
	\|
	\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 107:		Line 85:
	\|-		\|-
	\|Min level		\|Min level
	~~\|Displays the minimal value of the signal.~~
	\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 117:		Line 93:
	\|-		\|-
	\|Max level		\|Max level
	~~\|Display the maximal value of the signal.~~
	\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 127:		Line 101:
	\|-		\|-
	\|Peak		\|Peak
	~~\|Display the absolute value of Min level and Max level.~~
	\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 137:		Line 109:
	\|-		\|-
	\|Peak-Peak		\|Peak-Peak
	~~\|Displays the difference between Min level and max level. Peak-Peak level ≥ 0.~~
	\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 147:		Line 117:
	\|-		\|-
	\|Crest Factor		\|Crest Factor
	~~\|Display the ratio Peak level/RMS level. Characteristics of the Crest Factor:~~
	* Crest Factor ≥ 1
	* DC level = 1
	* Crest Factor of sinus = [[Image:FFT_03.gif]]
	* Max level = [[Image:FFT_04.gif]] with N = number of samples in the triggered block = 2.56*lines number-1
	\|
	\|1pt		\|1pt
	\|2D		\|2D
Line 161:		Line 125:
	\|-		\|-
	\|Avg. block		\|Avg. block
	~~\|Display the time signal block average.~~
	~~\|the ''FFT x/Average/Domain ''setting value is Time.~~
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 171:		Line 133:
	\|-		\|-
	\|Avg. Trigger Shaftview		\|Avg. Trigger Shaftview
	\|
	\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 181:		Line 141:
	\|-		\|-
	\|Weighted block		\|Weighted block
	~~\|This result displays the signal after being weighted by the weighting window selected using the ''FFT x/Channel x/Weighting window'' setting.~~
	\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 191:		Line 149:
	\|-		\|-
	\|Spectrum		\|Spectrum
	~~\|Display the result of the FFT processing after time averaging.~~
	~~\|the ''FFT x/Average/Domain ''setting value is Time.~~
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 201:		Line 157:
	\|-		\|-
	\|Inst. spectrum		\|Inst. spectrum
	~~\|Displays the FFT processing results.~~
	~~\|the ''FFT x/Average/Domain ''setting value is Spectral.~~
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 211:		Line 165:
	\|-		\|-
	\|Avg. spectrum		\|Avg. spectrum
	~~\|Displays the instant spectrum average result.~~
	~~\|the ''FFT x/Average/Domain ''setting value is Spectral.~~
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 221:		Line 173:
	\|-		\|-
	\|Order & Overall		\|Order & Overall
	~~\|Displays the result of the computation of the orders chosen with the ''FFT x/Channel x/Tracked order'' setting and the Overall level.~~
	~~\|the ''FFT x/Overall Analysis/Band power tracking '' is set to On.~~
	\|1 pt		\|1 pt
	\|1D		\|1D
Line 231:		Line 181:
	\|-		\|-
	\|Inst. cross-spectrum		\|Inst. cross-spectrum
	~~\|Displays the cross spectrum between the 2 channels selected.~~
	~~\|a cell is checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix.~~
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 241:		Line 189:
	\|-		\|-
	\|Avg. cross-spectrum		\|Avg. cross-spectrum
	~~\|Displays the instant cross spectrum average results.~~
	~~\|a cell is checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix.~~
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 450:		Line 396:

	\|}<br clear="all">		\|}<br clear="all">


	* '''Filtered signal''': This result is available if a filter is selected in the FFT x/Channel x/Input filter setting. It displays the input time signal after filtering.		* '''Filtered signal''': This result is available if a filter is selected in the FFT x/Channel x/Input filter setting. It displays the input time signal after filtering.

Credaelli: /* Display available results */

2022-01-07T15:44:55Z

Display available results

← Older revision		Revision as of 17:44, 7 January 2022
Line 37:		Line 37:
	{\|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center"		{\|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center"
	\|'''Type'''		\|'''Type'''
			\|'''Description'''
			\|'''Available if'''
	\|'''Size'''		\|'''Size'''
	\|'''Dimension'''		\|'''Dimension'''
Line 45:		Line 47:
	\|-		\|-
	\|Filtered signal		\|Filtered signal
			\|Display the input time signal after filtering.
			\|a filter is selected in the FFT x/Channel x/Input filter setting
	\|256 pt		\|256 pt
	\|2D		\|2D
Line 53:		Line 57:
	\|-		\|-
	\|Triggered block		\|Triggered block
			\|Displays the signal after being triggered by the event selected with the ''FFT x/Trigger/Trigger ''setting''.''
			\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 58:		Line 64:
	\| Yes		\| Yes
	\| FFT		\| FFT

			\|}<br clear="all">

			''Results below are calculated from the triggered block results. The refresh & computation rate depend on the PC to analyzer connection availability (non real-time results)''

			{\|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center"
			\|'''Type'''
			\|'''Description'''
			\|'''Available if'''
			\|'''Size'''
			\|'''Dimension'''
			\|'''Domain'''
			\|'''Save'''
			\|'''Option'''

	\|-		\|-
	\|Trigger Shaftview		\|Trigger Shaftview
			\|
			\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 85:		Line 107:
	\|-		\|-
	\|Min level		\|Min level
			\|Displays the minimal value of the signal.
			\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 93:		Line 117:
	\|-		\|-
	\|Max level		\|Max level
			\|Display the maximal value of the signal.
			\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 101:		Line 127:
	\|-		\|-
	\|Peak		\|Peak
			\|Display the absolute value of Min level and Max level.
			\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 109:		Line 137:
	\|-		\|-
	\|Peak-Peak		\|Peak-Peak
			\|Displays the difference between Min level and max level. Peak-Peak level ≥ 0.
			\|
	\|1pt		\|1pt
	\|1D		\|1D
Line 117:		Line 147:
	\|-		\|-
	\|Crest Factor		\|Crest Factor
			\|Display the ratio Peak level/RMS level. Characteristics of the Crest Factor:
			* Crest Factor ≥ 1
			* DC level = 1
			* Crest Factor of sinus = [[Image:FFT_03.gif]]
			* Max level = [[Image:FFT_04.gif]] with N = number of samples in the triggered block = 2.56*lines number-1
			\|
	\|1pt		\|1pt
	\|2D		\|2D
Line 125:		Line 161:
	\|-		\|-
	\|Avg. block		\|Avg. block
			\|Display the time signal block average.
			\|the ''FFT x/Average/Domain ''setting value is Time.
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 133:		Line 171:
	\|-		\|-
	\|Avg. Trigger Shaftview		\|Avg. Trigger Shaftview
			\|
			\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 141:		Line 181:
	\|-		\|-
	\|Weighted block		\|Weighted block
			\|This result displays the signal after being weighted by the weighting window selected using the ''FFT x/Channel x/Weighting window'' setting.
			\|
	\|(Resolution-1)*2,56		\|(Resolution-1)*2,56
	\|2D		\|2D
Line 149:		Line 191:
	\|-		\|-
	\|Spectrum		\|Spectrum
			\|Display the result of the FFT processing after time averaging.
			\|the ''FFT x/Average/Domain ''setting value is Time.
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 157:		Line 201:
	\|-		\|-
	\|Inst. spectrum		\|Inst. spectrum
			\|Displays the FFT processing results.
			\|the ''FFT x/Average/Domain ''setting value is Spectral.
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 165:		Line 211:
	\|-		\|-
	\|Avg. spectrum		\|Avg. spectrum
			\|Displays the instant spectrum average result.
			\|the ''FFT x/Average/Domain ''setting value is Spectral.
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 173:		Line 221:
	\|-		\|-
	\|Order & Overall		\|Order & Overall
			\|Displays the result of the computation of the orders chosen with the ''FFT x/Channel x/Tracked order'' setting and the Overall level.
			\|the ''FFT x/Overall Analysis/Band power tracking '' is set to On.
	\|1 pt		\|1 pt
	\|1D		\|1D
Line 181:		Line 231:
	\|-		\|-
	\|Inst. cross-spectrum		\|Inst. cross-spectrum
			\|Displays the cross spectrum between the 2 channels selected.
			\|a cell is checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix.
	\|Resolution		\|Resolution
	\|2D		\|2D
Line 189:		Line 241:
	\|-		\|-
	\|Avg. cross-spectrum		\|Avg. cross-spectrum
			\|Displays the instant cross spectrum average results.
			\|a cell is checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix.
	\|Resolution		\|Resolution
	\|2D		\|2D