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Re: [Csnd] Issues with dcblock, dcblock2

Date2022-08-25 19:15
FromScott Daughtrey
SubjectRe: [Csnd] Issues with dcblock, dcblock2
It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links: 

https://drive.google.com/file/d/1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI/view?usp=drivesdk

https://drive.google.com/file/d/1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R/view?usp=drivesdk

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Date2022-08-29 17:29
FromSteven Yi
SubjectRe: [Csnd] Issues with dcblock, dcblock2
Apologies for the delay in reply. As it is now I'm of the mindset that both are useful but have bigger caveats than I previously understood. dcblock2's usable range seems very limited with that rolloff starting well into bass range. I'll need to run some further investigation of dcblock though as that waveform is very different from what I expected. 

On Thu, Aug 25, 2022 at 2:15 PM Scott Daughtrey <stunes6556@gmail.com> wrote:
It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links:

https://drive.google.com/file/d/1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI/view?usp=drivesdk

https://drive.google.com/file/d/1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R/view?usp=drivesdk

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Date2022-08-30 12:58
FromVictor Lazzarini
SubjectRe: [Csnd] [EXTERNAL] [Csnd] Issues with dcblock, dcblock2
Attachmentsdcblock128.png  dcblock512.png  
I’m going to drop my two cents. I can’t speak for dcblock, but I implemented dcblock2 from someone else’s paper (I thought I had noted the reference but I did not, I can’t recall the paper now, must search for it).

Its slope is dependent on the filter order. The default is 128, and can be increased. Of course, longer filters will take more computation and also there may be other issues to do with the steepness of the amplitude response (I need to think about these, perhaps read the paper again since it’s been a long time).

To demonstrate this, see the amplitude responses for orders 128 and 512.

best
========================
Prof. Victor Lazzarini
Maynooth University
Ireland


On 29 Aug 2022, at 17:29, Steven Yi <stevenyi@GMAIL.COM> wrote:

WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
Apologies for the delay in reply. As it is now I'm of the mindset that both are useful but have bigger caveats than I previously understood. dcblock2's usable range seems very limited with that rolloff starting well into bass range. I'll need to run some further investigation of dcblock though as that waveform is very different from what I expected. 

On Thu, Aug 25, 2022 at 2:15 PM Scott Daughtrey <stunes6556@gmail.com> wrote:
It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links: 

https://drive.google.com/file/d/1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI/view?usp=drivesdk

https://drive.google.com/file/d/1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R/view?usp=drivesdk

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Date2022-08-30 14:16
FromVictor Lazzarini
SubjectRe: [Csnd] [EXTERNAL] [Csnd] Issues with dcblock, dcblock2
I *think* the dcblocker2 corresponds to the linear-phase filter in this text (by quickly comparing the code to it)

https://www.iro.umontreal.ca/~mignotte/IFT3205/Documents/TipsAndTricks/DCBlockerAlgorithms.pdf

but I don’t remember picking it from here. I thought this came from a DAFX paper, but I can’t find it.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 30 Aug 2022, at 12:58, Victor Lazzarini  wrote:
> 
> I’m going to drop my two cents. I can’t speak for dcblock, but I implemented dcblock2 from someone else’s paper (I thought I had noted the reference but I did not, I can’t recall the paper now, must search for it).
> 
> Its slope is dependent on the filter order. The default is 128, and can be increased. Of course, longer filters will take more computation and also there may be other issues to do with the steepness of the amplitude response (I need to think about these, perhaps read the paper again since it’s been a long time).
> 
> To demonstrate this, see the amplitude responses for orders 128 and 512.
> 
> best
> ========================
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
> 
> 
> 
>> On 29 Aug 2022, at 17:29, Steven Yi  wrote:
>> 
>> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
>> Apologies for the delay in reply. As it is now I'm of the mindset that both are useful but have bigger caveats than I previously understood. dcblock2's usable range seems very limited with that rolloff starting well into bass range. I'll need to run some further investigation of dcblock though as that waveform is very different from what I expected. 
>> 
>> On Thu, Aug 25, 2022 at 2:15 PM Scott Daughtrey  wrote:
>> It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links: 
>> 
>> https://drive.google.com/file/d/1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI/view?usp=drivesdk
>> 
>> https://drive.google.com/file/d/1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R/view?usp=drivesdk
>> 
>> Csound mailing list
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>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>         https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
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> 
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Date2022-08-30 14:33
FromJohn ff
SubjectRe: [Csnd] [EXTERNAL] [Csnd] Issues with dcblock, dcblock2
dcblock is from Perry Cook coded by me. Just a simple hp filter

On 30 Aug 2022, at 12:59, Victor Lazzarini <victor.lazzarini@mu.ie> wrote:
I’m going to drop my two cents. I can’t speak for dcblock, but I implemented dcblock2 from someone else’s paper (I thought I had noted the reference but I did not, I can’t recall the paper now, must search for it).

Its slope is dependent on the filter order. The default is 128, and can be increased. Of course, longer filters will take more computation and also there may be other issues to do with the steepness of the amplitude response (I need to think about these, perhaps read the paper again since it’s been a long time).

To demonstrate this, see the amplitude responses for orders 128 and 512.

best
========================
Prof. Victor Lazzarini
Maynooth University
Ireland


On 29 Aug 2022, at 17:29, Steven Yi <stevenyi@GMAIL.COM> wrote:

WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
Apologies for the delay in reply. As it is now I'm of the mindset that both are useful but have bigger caveats than I previously understood. dcblock2's usable range seems very limited with that rolloff starting well into bass range. I'll need to run some further investigation of dcblock though as that waveform is very different from what I expected. 

On Thu, Aug 25, 2022 at 2:15 PM Scott Daughtrey <stunes6556@gmail.com> wrote:
It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links: 

https://drive.google.com/file/d/1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI/view?usp=drivesdk

https://drive.google.com/file/d/1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R/view?usp=drivesdk

Csound mailing list
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        https://github.com/csound/csound/issues
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Date2022-08-30 14:43
FromVictor Lazzarini
SubjectRe: [Csnd] [EXTERNAL] [Csnd] Issues with dcblock, dcblock2
Actually, looking at the code, the impact on the CPU should be negligible if at all present. It’s only a longer delay, but
the computation is the same. The effect is in the increased group delay, which may or may not be relevant.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 30 Aug 2022, at 14:16, Victor Lazzarini  wrote:
> 
> I *think* the dcblocker2 corresponds to the linear-phase filter in this text (by quickly comparing the code to it)
> 
> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.iro.umontreal.ca%2F~mignotte%2FIFT3205%2FDocuments%2FTipsAndTricks%2FDCBlockerAlgorithms.pdf&data=05%7C01%7CVictor.Lazzarini%40mu.ie%7C56d7ad47b2744bc62d1a08da8a89e6e5%7C1454f5ccbb354685bbd98621fd8055c9%7C0%7C0%7C637974623315394795%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7tskGvhvk5qxQFjo5sG1Tx3lsxCnsBxQdIBySAB8CK4%3D&reserved=0
> 
> but I don’t remember picking it from here. I thought this came from a DAFX paper, but I can’t find it.
> ========================
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
> 
>> On 30 Aug 2022, at 12:58, Victor Lazzarini  wrote:
>> 
>> I’m going to drop my two cents. I can’t speak for dcblock, but I implemented dcblock2 from someone else’s paper (I thought I had noted the reference but I did not, I can’t recall the paper now, must search for it).
>> 
>> Its slope is dependent on the filter order. The default is 128, and can be increased. Of course, longer filters will take more computation and also there may be other issues to do with the steepness of the amplitude response (I need to think about these, perhaps read the paper again since it’s been a long time).
>> 
>> To demonstrate this, see the amplitude responses for orders 128 and 512.
>> 
>> best
>> ========================
>> Prof. Victor Lazzarini
>> Maynooth University
>> Ireland
>> 
>> 
>> 
>>> On 29 Aug 2022, at 17:29, Steven Yi  wrote:
>>> 
>>> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
>>> Apologies for the delay in reply. As it is now I'm of the mindset that both are useful but have bigger caveats than I previously understood. dcblock2's usable range seems very limited with that rolloff starting well into bass range. I'll need to run some further investigation of dcblock though as that waveform is very different from what I expected. 
>>> 
>>> On Thu, Aug 25, 2022 at 2:15 PM Scott Daughtrey  wrote:
>>> It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links: 
>>> 
>>> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI%2Fview%3Fusp%3Ddrivesdk&data=05%7C01%7CVictor.Lazzarini%40mu.ie%7C56d7ad47b2744bc62d1a08da8a89e6e5%7C1454f5ccbb354685bbd98621fd8055c9%7C0%7C0%7C637974623315394795%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=wvgcsQKYnIkwubCk9sAtwppOoOMnTtxP8sCh%2FJ1awVQ%3D&reserved=0
>>> 
>>> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R%2Fview%3Fusp%3Ddrivesdk&data=05%7C01%7CVictor.Lazzarini%40mu.ie%7C56d7ad47b2744bc62d1a08da8a89e6e5%7C1454f5ccbb354685bbd98621fd8055c9%7C0%7C0%7C637974623315394795%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=FEtkwMVLiebFWOyZZDFroYLzyyQy8guG55g5tKwn2ew%3D&reserved=0
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>> 
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> 
> 
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Date2022-08-30 16:27
FromRory Walsh
SubjectRe: [Csnd] [EXTERNAL] [Csnd] Issues with dcblock, dcblock2
Perhaps it came to you in a dream Victor? 🤣 

On Tue 30 Aug 2022, 2:16 p.m. Victor Lazzarini, <Victor.Lazzarini@mu.ie> wrote:
I *think* the dcblocker2 corresponds to the linear-phase filter in this text (by quickly comparing the code to it)

https://www.iro.umontreal.ca/~mignotte/IFT3205/Documents/TipsAndTricks/DCBlockerAlgorithms.pdf

but I don’t remember picking it from here. I thought this came from a DAFX paper, but I can’t find it.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 30 Aug 2022, at 12:58, Victor Lazzarini <Victor.Lazzarini@mu.ie> wrote:
>
> I’m going to drop my two cents. I can’t speak for dcblock, but I implemented dcblock2 from someone else’s paper (I thought I had noted the reference but I did not, I can’t recall the paper now, must search for it).
>
> Its slope is dependent on the filter order. The default is 128, and can be increased. Of course, longer filters will take more computation and also there may be other issues to do with the steepness of the amplitude response (I need to think about these, perhaps read the paper again since it’s been a long time).
>
> To demonstrate this, see the amplitude responses for orders 128 and 512.
>
> best
> ========================
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
>
> <dcblock128.png><dcblock512.png>
>
>> On 29 Aug 2022, at 17:29, Steven Yi <stevenyi@GMAIL.COM> wrote:
>>
>> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
>> Apologies for the delay in reply. As it is now I'm of the mindset that both are useful but have bigger caveats than I previously understood. dcblock2's usable range seems very limited with that rolloff starting well into bass range. I'll need to run some further investigation of dcblock though as that waveform is very different from what I expected.
>>
>> On Thu, Aug 25, 2022 at 2:15 PM Scott Daughtrey <stunes6556@gmail.com> wrote:
>> It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links:
>>
>> https://drive.google.com/file/d/1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI/view?usp=drivesdk
>>
>> https://drive.google.com/file/d/1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R/view?usp=drivesdk
>>
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>         https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
>> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
>
> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here


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Date2022-08-30 16:37
FromVictor Lazzarini
SubjectRe: [Csnd] [EXTERNAL] [Csnd] Issues with dcblock, dcblock2
It might as well have been, it’s all a daze, Csound 5.09, don’t even know when that was.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 30 Aug 2022, at 16:27, Rory Walsh  wrote:
> 
> Perhaps it came to you in a dream Victor? 🤣 
> 
> On Tue 30 Aug 2022, 2:16 p.m. Victor Lazzarini,  wrote:
> I *think* the dcblocker2 corresponds to the linear-phase filter in this text (by quickly comparing the code to it)
> 
> https://www.iro.umontreal.ca/~mignotte/IFT3205/Documents/TipsAndTricks/DCBlockerAlgorithms.pdf
> 
> but I don’t remember picking it from here. I thought this came from a DAFX paper, but I can’t find it.
> ========================
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
> 
> > On 30 Aug 2022, at 12:58, Victor Lazzarini  wrote:
> > 
> > I’m going to drop my two cents. I can’t speak for dcblock, but I implemented dcblock2 from someone else’s paper (I thought I had noted the reference but I did not, I can’t recall the paper now, must search for it).
> > 
> > Its slope is dependent on the filter order. The default is 128, and can be increased. Of course, longer filters will take more computation and also there may be other issues to do with the steepness of the amplitude response (I need to think about these, perhaps read the paper again since it’s been a long time).
> > 
> > To demonstrate this, see the amplitude responses for orders 128 and 512.
> > 
> > best
> > ========================
> > Prof. Victor Lazzarini
> > Maynooth University
> > Ireland
> > 
> > 
> > 
> >> On 29 Aug 2022, at 17:29, Steven Yi  wrote:
> >> 
> >> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
> >> Apologies for the delay in reply. As it is now I'm of the mindset that both are useful but have bigger caveats than I previously understood. dcblock2's usable range seems very limited with that rolloff starting well into bass range. I'll need to run some further investigation of dcblock though as that waveform is very different from what I expected. 
> >> 
> >> On Thu, Aug 25, 2022 at 2:15 PM Scott Daughtrey  wrote:
> >> It appears the 2 attachments didn't propagate correctly, why I don't know. But if you're curious to see them here are links: 
> >> 
> >> https://drive.google.com/file/d/1iONfYQZz1hypS9Z-wOLNnvuLXJURBSZI/view?usp=drivesdk
> >> 
> >> https://drive.google.com/file/d/1iY8iAAZAfmNxEvB0NFcQi13M0pLD1j2R/view?usp=drivesdk
> >> 
> >> Csound mailing list
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> > 
> > Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
> 
> 
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