Talk:Goertzel algorithm - Revision history

Cewbot: Maintain {{WPBS}}: 2 WikiProject templates. Remove 1 deprecated parameter: field.

2024-03-09T00:54:35Z

Maintain {{WPBS}}: 2 WikiProject templates. Remove 1 deprecated parameter: field.

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	{{WikiProject banner shell\|class=Start\|		{{WikiProject banner shell\|class=Start\|
	{{WikiProject Mathematics\|importance=low~~\|field=applied~~}}		{{WikiProject Mathematics\|importance=low}}
	{{WikiProject Computer science}}		{{WikiProject Computer science}}
	}}		}}

Qwerfjkl (bot): Implementing WP:PIQA (Task 26)

2024-01-25T05:11:36Z

Implementing WP:PIQA (Task 26)

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			{{WikiProject banner shell\|class=Start\|
	{{maths rating\|class=start\|importance=low\|field=applied}}
	{{WikiProject ~~Computer Science~~\|~~class~~=~~start~~}}		{{WikiProject Mathematics\|importance=low\|field=applied}}
			{{WikiProject Computer science}}
			}}

	{{Mathematical diagram requested}}		{{Mathematical diagram requested}}

SineBot: Signing comment by 46.151.207.2 - ""

2023-07-25T12:56:18Z

Signing comment by 46.151.207.2 - ""

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	== Stability ==		== Stability ==
	Rick Lyons (author of "Understanding DSP") wrote a blog post to specifically to address a perceived mistake in this very wikipedia article, regarding the stability of goertzel filters:		Rick Lyons (author of "Understanding DSP") wrote a blog post to specifically to address a perceived mistake in this very wikipedia article, regarding the stability of goertzel filters:
			https://www.dsprelated.com/showarticle/796.php <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/46.151.207.2\|46.151.207.2]] ([[User talk:46.151.207.2#top\|talk]]) 12:55, 25 July 2023 (UTC)</small> <!--Autosigned by SineBot-->
	https://www.dsprelated.com/showarticle/796.php

46.151.207.2 at 12:55, 25 July 2023

2023-07-25T12:55:10Z

← Previous revision		Revision as of 12:55, 25 July 2023
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	: {{mvar\|j}} is the square root of −1; it is the same as {{mvar\|i}} in typical mathematics.. It is a common variable in electrical engineering and is often not identified. Functions such as {{math\|sin}} and {{math\|cos}} are also infrequently explained. [[User:Glrx\|Glrx]] ([[User talk:Glrx\|talk]]) 19:08, 13 August 2019 (UTC)		: {{mvar\|j}} is the square root of −1; it is the same as {{mvar\|i}} in typical mathematics.. It is a common variable in electrical engineering and is often not identified. Functions such as {{math\|sin}} and {{math\|cos}} are also infrequently explained. [[User:Glrx\|Glrx]] ([[User talk:Glrx\|talk]]) 19:08, 13 August 2019 (UTC)
	: I came here to ask the same question: what does {{mvar\|j}} mean? I now understand that it means the same "square root of -1" that I label {{mvar\|i}}. It would be nice if the article stated this clearly. Maybe this can be addressed as part of rewriting to fix all the other difficulties which others have noted above. --[[User:Jdlh\|Jdlh ]] \| [[User talk:Jdlh\|Talk]] 18:45, 14 May 2020 (UTC)		: I came here to ask the same question: what does {{mvar\|j}} mean? I now understand that it means the same "square root of -1" that I label {{mvar\|i}}. It would be nice if the article stated this clearly. Maybe this can be addressed as part of rewriting to fix all the other difficulties which others have noted above. --[[User:Jdlh\|Jdlh ]] \| [[User talk:Jdlh\|Talk]] 18:45, 14 May 2020 (UTC)

			== Stability ==
			Rick Lyons (author of "Understanding DSP") wrote a blog post to specifically to address a perceived mistake in this very wikipedia article, regarding the stability of goertzel filters:
			https://www.dsprelated.com/showarticle/796.php

Jdlh: /* equation given in 'the algorithm' has unidentified term */ I wonder what "j" means also

2020-05-14T18:45:12Z

equation given in 'the algorithm' has unidentified term: I wonder what "j" means also

← Previous revision		Revision as of 18:45, 14 May 2020
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	it says bla bla to the power of -jw0. i understand the w0 part, but what is j? <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/101.98.178.115\|101.98.178.115]] ([[User talk:101.98.178.115#top\|talk]]) 10:32, 24 July 2019 (UTC)</small> <!--Autosigned by SineBot-->		it says bla bla to the power of -jw0. i understand the w0 part, but what is j? <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/101.98.178.115\|101.98.178.115]] ([[User talk:101.98.178.115#top\|talk]]) 10:32, 24 July 2019 (UTC)</small> <!--Autosigned by SineBot-->
	: {{mvar\|j}} is the square root of −1; it is the same as {{mvar\|i}} in typical mathematics.. It is a common variable in electrical engineering and is often not identified. Functions such as {{math\|sin}} and {{math\|cos}} are also infrequently explained. [[User:Glrx\|Glrx]] ([[User talk:Glrx\|talk]]) 19:08, 13 August 2019 (UTC)		: {{mvar\|j}} is the square root of −1; it is the same as {{mvar\|i}} in typical mathematics.. It is a common variable in electrical engineering and is often not identified. Functions such as {{math\|sin}} and {{math\|cos}} are also infrequently explained. [[User:Glrx\|Glrx]] ([[User talk:Glrx\|talk]]) 19:08, 13 August 2019 (UTC)
			: I came here to ask the same question: what does {{mvar\|j}} mean? I now understand that it means the same "square root of -1" that I label {{mvar\|i}}. It would be nice if the article stated this clearly. Maybe this can be addressed as part of rewriting to fix all the other difficulties which others have noted above. --[[User:Jdlh\|Jdlh ]] \| [[User talk:Jdlh\|Talk]] 18:45, 14 May 2020 (UTC)

Glrx: /* equation given in 'the algorithm' has unidentified term */

2019-08-13T19:08:52Z

equation given in 'the algorithm' has unidentified term

← Previous revision		Revision as of 19:08, 13 August 2019
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	it says bla bla to the power of -jw0. i understand the w0 part, but what is j? <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/101.98.178.115\|101.98.178.115]] ([[User talk:101.98.178.115#top\|talk]]) 10:32, 24 July 2019 (UTC)</small> <!--Autosigned by SineBot-->		it says bla bla to the power of -jw0. i understand the w0 part, but what is j? <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/101.98.178.115\|101.98.178.115]] ([[User talk:101.98.178.115#top\|talk]]) 10:32, 24 July 2019 (UTC)</small> <!--Autosigned by SineBot-->
			: {{mvar\|j}} is the square root of −1; it is the same as {{mvar\|i}} in typical mathematics.. It is a common variable in electrical engineering and is often not identified. Functions such as {{math\|sin}} and {{math\|cos}} are also infrequently explained. [[User:Glrx\|Glrx]] ([[User talk:Glrx\|talk]]) 19:08, 13 August 2019 (UTC)

Glrx: Undid revision 907649334 by 101.98.178.115 (talk) unsigned; not about improving article

2019-08-13T19:00:52Z

Undid revision 907649334 by 101.98.178.115 (talk) unsigned; not about improving article

← Previous revision		Revision as of 19:00, 13 August 2019
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	In the Goertzel algorithm, exactly the same thing happens, except it uses a simple IIR oscillator.		In the Goertzel algorithm, exactly the same thing happens, except it uses a simple IIR oscillator.

	^^
	this is the best paragraph on this subject ive seen yet. also i feel for the telecoms guy whos c code was taken down. some times an encyclopedia's goal of perfectly describing something is at odds with comprehension

	<!-- Template:Unsigned --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[User:Gutta Percha\|Gutta Percha]] ([[User talk:Gutta Percha#top\|talk]] • [[Special:Contributions/Gutta Percha\|contribs]]) 07:45, 10 March 2017 (UTC)</small>		<!-- Template:Unsigned --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[User:Gutta Percha\|Gutta Percha]] ([[User talk:Gutta Percha#top\|talk]] • [[Special:Contributions/Gutta Percha\|contribs]]) 07:45, 10 March 2017 (UTC)</small>



	:What a clever relationship you have noticed and pointed out! If you can find a source about that, do add it to the article. Actually, though, the Goertzel algorithm's filter is infinite-Q, or conditionally stable, while the filters used in super-regeneration are actually unstable (unlike simple regenerative, which is finite Q and stable). So the Goertzel algorithm can be viewed as being on the exact border between regenerative and super-regenerative. These do serve a similar purpose, as you point out. You can probably find a second-order IIR filter diagram and specialize it for this article if you like, to show that your motivations are indeed more pure than all us other wikipedia editors, who just like to show off and make things look complicated when they're not. [[User:Dicklyon\|Dicklyon]] ([[User talk:Dicklyon\|talk]]) 18:15, 19 March 2017 (UTC)		:What a clever relationship you have noticed and pointed out! If you can find a source about that, do add it to the article. Actually, though, the Goertzel algorithm's filter is infinite-Q, or conditionally stable, while the filters used in super-regeneration are actually unstable (unlike simple regenerative, which is finite Q and stable). So the Goertzel algorithm can be viewed as being on the exact border between regenerative and super-regenerative. These do serve a similar purpose, as you point out. You can probably find a second-order IIR filter diagram and specialize it for this article if you like, to show that your motivations are indeed more pure than all us other wikipedia editors, who just like to show off and make things look complicated when they're not. [[User:Dicklyon\|Dicklyon]] ([[User talk:Dicklyon\|talk]]) 18:15, 19 March 2017 (UTC)

SineBot: Signing comment by 101.98.178.115 - "/* equation given in 'the algorithm' has unidentified term */ new section"

2019-07-24T10:33:23Z

Signing comment by 101.98.178.115 - "equation given in 'the algorithm' has unidentified term: new section"

← Previous revision		Revision as of 10:33, 24 July 2019
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	what is the j in the exponent term?		what is the j in the exponent term?

	it says bla bla to the power of -jw0. i understand the w0 part, but what is j?		it says bla bla to the power of -jw0. i understand the w0 part, but what is j? <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/101.98.178.115\|101.98.178.115]] ([[User talk:101.98.178.115#top\|talk]]) 10:32, 24 July 2019 (UTC)</small> <!--Autosigned by SineBot-->

101.98.178.115: /* equation given in 'the algorithm' has unidentified term */ new section

2019-07-24T10:32:22Z

equation given in 'the algorithm' has unidentified term: new section

← Previous revision		Revision as of 10:32, 24 July 2019
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	In the Application section value ci is set however it is not used in the pseudcode offered. The ci value is used to compute the imaginary part which is not used in the example shown. Either the full algorithm should be shown else the ci line should be removed. [[User:SoftwareThing\|SoftwareThing]] ([[User talk:SoftwareThing\|talk]]) 22:22, 7 September 2018 (UTC)		In the Application section value ci is set however it is not used in the pseudcode offered. The ci value is used to compute the imaginary part which is not used in the example shown. Either the full algorithm should be shown else the ci line should be removed. [[User:SoftwareThing\|SoftwareThing]] ([[User talk:SoftwareThing\|talk]]) 22:22, 7 September 2018 (UTC)

			== equation given in 'the algorithm' has unidentified term ==

			what is the j in the exponent term?

			it says bla bla to the power of -jw0. i understand the w0 part, but what is j?

101.98.178.115 at 10:08, 24 July 2019

2019-07-24T10:08:44Z

← Previous revision		Revision as of 10:08, 24 July 2019
Line 202:		Line 202:

	In the Goertzel algorithm, exactly the same thing happens, except it uses a simple IIR oscillator.		In the Goertzel algorithm, exactly the same thing happens, except it uses a simple IIR oscillator.

			^^
			this is the best paragraph on this subject ive seen yet. also i feel for the telecoms guy whos c code was taken down. some times an encyclopedia's goal of perfectly describing something is at odds with comprehension

	<!-- Template:Unsigned --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[User:Gutta Percha\|Gutta Percha]] ([[User talk:Gutta Percha#top\|talk]] • [[Special:Contributions/Gutta Percha\|contribs]]) 07:45, 10 March 2017 (UTC)</small>		<!-- Template:Unsigned --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[User:Gutta Percha\|Gutta Percha]] ([[User talk:Gutta Percha#top\|talk]] • [[Special:Contributions/Gutta Percha\|contribs]]) 07:45, 10 March 2017 (UTC)</small>



	:What a clever relationship you have noticed and pointed out! If you can find a source about that, do add it to the article. Actually, though, the Goertzel algorithm's filter is infinite-Q, or conditionally stable, while the filters used in super-regeneration are actually unstable (unlike simple regenerative, which is finite Q and stable). So the Goertzel algorithm can be viewed as being on the exact border between regenerative and super-regenerative. These do serve a similar purpose, as you point out. You can probably find a second-order IIR filter diagram and specialize it for this article if you like, to show that your motivations are indeed more pure than all us other wikipedia editors, who just like to show off and make things look complicated when they're not. [[User:Dicklyon\|Dicklyon]] ([[User talk:Dicklyon\|talk]]) 18:15, 19 March 2017 (UTC)		:What a clever relationship you have noticed and pointed out! If you can find a source about that, do add it to the article. Actually, though, the Goertzel algorithm's filter is infinite-Q, or conditionally stable, while the filters used in super-regeneration are actually unstable (unlike simple regenerative, which is finite Q and stable). So the Goertzel algorithm can be viewed as being on the exact border between regenerative and super-regenerative. These do serve a similar purpose, as you point out. You can probably find a second-order IIR filter diagram and specialize it for this article if you like, to show that your motivations are indeed more pure than all us other wikipedia editors, who just like to show off and make things look complicated when they're not. [[User:Dicklyon\|Dicklyon]] ([[User talk:Dicklyon\|talk]]) 18:15, 19 March 2017 (UTC)

← Previous revision		Revision as of 18:45, 14 May 2020
Line 225:		Line 225:
	it says bla bla to the power of -jw0. i understand the w0 part, but what is j? <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/101.98.178.115\|101.98.178.115]] ([[User talk:101.98.178.115#top\|talk]]) 10:32, 24 July 2019 (UTC)</small> <!--Autosigned by SineBot-->		it says bla bla to the power of -jw0. i understand the w0 part, but what is j? <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures\|unsigned]] comment added by [[Special:Contributions/101.98.178.115\|101.98.178.115]] ([[User talk:101.98.178.115#top\|talk]]) 10:32, 24 July 2019 (UTC)</small> <!--Autosigned by SineBot-->
	: {{mvar\|j}} is the square root of −1; it is the same as {{mvar\|i}} in typical mathematics.. It is a common variable in electrical engineering and is often not identified. Functions such as {{math\|sin}} and {{math\|cos}} are also infrequently explained. [[User:Glrx\|Glrx]] ([[User talk:Glrx\|talk]]) 19:08, 13 August 2019 (UTC)		: {{mvar\|j}} is the square root of −1; it is the same as {{mvar\|i}} in typical mathematics.. It is a common variable in electrical engineering and is often not identified. Functions such as {{math\|sin}} and {{math\|cos}} are also infrequently explained. [[User:Glrx\|Glrx]] ([[User talk:Glrx\|talk]]) 19:08, 13 August 2019 (UTC)
			: I came here to ask the same question: what does {{mvar\|j}} mean? I now understand that it means the same "square root of -1" that I label {{mvar\|i}}. It would be nice if the article stated this clearly. Maybe this can be addressed as part of rewriting to fix all the other difficulties which others have noted above. --[[User:Jdlh\|Jdlh ]] \| [[User talk:Jdlh\|Talk]] 18:45, 14 May 2020 (UTC)