Cycling 74 » Topic: delay~ object not sample accurate http://cycling74.com/forums/topic/delay-object-not-sample-accurate/feed Tue, 18 Jun 2013 17:02:08 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-40129 <![CDATA[delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-40129 Thu, 02 Oct 2008 21:50:55 +0000 Staas de Jong I am working on an Intel MacBook with a Motu 828mkII audio interface and Max/MSP.

To my shocked surprise, I found that delay~ in fact is not sample accurate.

The following patch contains a quick demonstration of the bug, along with a hypothesis as to its cause.

Thanks in advance for any feedback on this.

Kind regards, Staas.

– Pasted Max Patch, click to expand. –

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141694 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141694 Fri, 03 Oct 2008 00:12:51 +0000 David Zicarelli Hello Staas,

I don’t really understand what the patch you’ve created is doing, but this patch demonstrates (to me at least) that delay~ is sample-accurate. I’m happy to let someone else determine whether there is another issue involved.

– Pasted Max Patch, click to expand. –

David Z.

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141695 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141695 Fri, 03 Oct 2008 04:07:42 +0000 Edwin van der Heide I can confirm the problem that Staas is mentioning. delay~ is giving
the wrong delay for the sample rates 48kHz and 96 kHz. Furthermore I
seem to now and then get one of errors at 44.1kHz as well.

Here is my test patch. Please try it at different sample rates.

– Pasted Max Patch, click to expand. –

all the best,

Edwin

On 3 okt 2008, at 02:12, David Zicarelli wrote:

>
> Hello Staas,
>
> I don’t really understand what the patch you’ve created is doing,
> but this patch demonstrates (to me at least) that delay~ is sample-
> accurate. I’m happy to let someone else determine whether there is
> another issue involved.
>

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141696 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141696 Fri, 03 Oct 2008 06:44:31 +0000 Eric Lyon It appears that 44.1KHz may be hard coded as the SR for delay~

Eric

– Pasted Max Patch, click to expand. –

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141697 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141697 Fri, 03 Oct 2008 12:22:00 +0000 AlexHarker I believe there are two distinct issues here:

1 – as eric identifies delay seems to be somehow tied to a 44.1kHz sample rate

2 – At 44.1kHz certain values seem to work as expected – others do not. I believe this issue has been raised in this thread (http://www.cycling74.com/forums/index.php?t=msg&goto=149972&rid=0&S=7638b027ad91b570e9ef8c1924cc7990), but not yet resolved. The patch below demonstrates a few unexpected cases.

I do not experience EITHER issue in Max 4.6 – these appear to be Max 5 only problems.

I’m running on OS 10.4.11 with the latest version of Max 5.

Alex

– Pasted Max Patch, click to expand. –

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141698 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141698 Fri, 03 Oct 2008 15:43:42 +0000 Andrew Pask Yeah, it’s gotten all busted up at some point.

We’ll fix it. Thanks guys.

-A

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141699 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141699 Sun, 05 Oct 2008 00:29:18 +0000 David Zicarelli Here is a version of the delay~ object for the Mac that should fix the reported problems with sample accuracy at sample rates other than 44100. We may not be able to build an updated Windows version for a few days, but if you are really concerned about this problem immediately you can use the Max 4.6 version.

http://www.cycling74.com/download/delay_mxo.zip

Replace in Cycling ’74/msp-externals folder.

There is a very slight lack of accuracy at 44100 that has been fixed as well.

David Z.

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141700 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141700 Tue, 07 Oct 2008 22:48:50 +0000 John MacCallum Hi David,

The new version of delay~ that you posted doesn’t seem to work with a one sample delay at 44.1. A series of clicks going into delay~ don’t come out. I’m on 5.0.5.

JM

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141701 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141701 Wed, 08 Oct 2008 18:49:28 +0000 David Zicarelli > The new version of delay~ that you posted doesn’t seem to work with a one sample delay at 44.1. A series of clicks going into delay~ don’t come out. I’m on 5.0.5.

The patch below works for me. But maybe I don’t understand what you mean by a “series” of clicks?

David Z.

– Pasted Max Patch, click to expand. –

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141702 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141702 Thu, 09 Oct 2008 03:13:09 +0000 John MacCallum Hi David–thanks for looking into this.

The patch below doesn’t work for me with the recently posted version of delay~, but works fine with the original version. It looks like the new version of delay~ isn’t actually delaying the signal in this case. I’ve attached two 4-channel aif files produced by the patch below which demonstrate the problem.

Thanks again,
JM

– Pasted Max Patch, click to expand. –

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141703 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141703 Thu, 09 Oct 2008 19:33:58 +0000 David Zicarelli Thanks for the example, which demonstrates a rounding error when setting delay times via the initial argument. I have replaced the updated delay object with a new one at the same location:

http://www.cycling74.com/download/delay_mxo.zip

David Z.

]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141704 <![CDATA[Re: delay~ object not sample accurate]]> http://cycling74.com/forums/topic/delay-object-not-sample-accurate/#post-141704 Fri, 10 Oct 2008 15:50:16 +0000 John MacCallum Thanks a lot–the new one works great.

JM

]]>