[PD] Moving Sum object?

Tue Dec 8 19:21:32 CET 2015

*> Now, can you do that in pd?*

I don't think we can. It's be really easy to add a "clear" message method
to [delwrite~] though.

I was just checking, [tapin~] in max has a "clear" message, so you could do
it there.

[delay~] from max can also clear

our [cyclone/delay~], on the other hand, doesn't have this feature!

[z~] also does not clear it's buffer

so we're pretty much tied up.

I think [cyclone/delay~] should be fixed to proper clone the max object and
allow this.

We should definitely have this in [delwrite~], please!!!!

I don't believe having that in [z~] is really that important, specially if
we have it in the previous two options, but what the hell, why not, right?

cheers

2015-12-08 16:10 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:

> > I'm not sure why the other patches don't work but this does.
>
> I got it, you'd need to clear the other delay buffers as well, not the
> feedback only!
>
> so we can do this with fexpr~ for up half the block size, we could expand
> this limit with delay lines, but if we want to do it with delay lines, we
> have to clean the delay buffers somehow
>
> *Now, can you do that in pd?*
>
> 2015-12-08 15:54 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:
>
>> I just wish we could make it work over the half block limit, and I'm not
>> sure why the other patches don't work but this does.
>>
>> 2015-12-08 15:53 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:
>>
>>> here's a better patch
>>>
>>> 2015-12-08 15:44 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:
>>>
>>>> I've made it work with this design in fexpr, but it's only good up to
>>>> half the block size
>>>>
>>>>
>>>> 2015-12-08 15:21 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:
>>>>
>>>>> As I say in the attached patch; problem is that whenever you change
>>>>> the number of samples without clearing or clearing the filter, it goes
>>>>> crazy...
>>>>>
>>>>> not sure how to fix this.
>>>>>
>>>>> cheers
>>>>>
>>>>>
>>>>> 2015-12-08 10:40 GMT-02:00 Christof Ressi <christof.ressi at gmx.at>:
>>>>>
>>>>>> the filter is working perfectly well for me. send me your testing
>>>>>> patch.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Gesendet: Dienstag, 08. Dezember 2015 um 13:36 Uhr
>>>>>> Von: "Alexandre Torres Porres" <porres at gmail.com>
>>>>>> An: "Christof Ressi" <christof.ressi at gmx.at>
>>>>>> Cc: "pd-list at lists.iem.at" <pd-list at lists.iem.at>
>>>>>> Betreff: Re: Re: Re: [PD] Moving Sum object?
>>>>>>
>>>>>> not sure this is working either, I'm getting negative values when
>>>>>> testing it with count~ (only positive values)
>>>>>>
>>>>>> 2015-12-08 10:30 GMT-02:00 Christof Ressi <christof.ressi at gmx.at>:It
>>>>>> certainly is and I have no idea how that happened :-D. but it has no effect
>>>>>> whatsoever. just delete the connection.
>>>>>>
>>>>>>
>>>>>> Gesendet: Dienstag, 08. Dezember 2015 um 13:20 Uhr
>>>>>> Von: "Alexandre Torres Porres" <porres at gmail.com[porres at gmail.com]>
>>>>>> An: "Christof Ressi" <christof.ressi at gmx.at[christof.ressi at gmx.at]>
>>>>>> Cc: "pd-list at lists.iem.at[pd-list at lists.iem.at]" <
>>>>>> pd-list at lists.iem.at[pd-list at lists.iem.at]>
>>>>>> Betreff: Re: Re: [PD] Moving Sum object?
>>>>>>
>>>>>> what was the purpose of the output from the max object into rpole~ in
>>>>>> your patch? that's a bug, right?
>>>>>>
>>>>>> cheers
>>>>>>
>>>>>> 2015-12-08 9:50 GMT-02:00 Christof Ressi <christof.ressi at gmx.at[
>>>>>> christof.ressi at gmx.at]>:
>>>>>>
>>>>>> Or are you talking about a object that outputs the sum as a message?
>>>>>> In that case just use [cmavg~] or [maverage~] with [snapshot~]. If you just
>>>>>> want the sum of a signal vector, there are some objects in zexy that will
>>>>>> do the job, like [avg~] or [pack~]+[sum]
>>>>>>
>>>>>>
>>>>>> Gesendet: Dienstag, 08. Dezember 2015 um 12:41 Uhr
>>>>>> Von: "Christof Ressi" <christof.ressi at gmx.at[christof.ressi at gmx.at][
>>>>>> christof.ressi at gmx.at[christof.ressi at gmx.at]]>
>>>>>>
>>>>>> An: "Alexandre Torres Porres" <porres at gmail.com[porres at gmail.com][
>>>>>> porres at gmail.com[porres at gmail.com]]>
>>>>>> Cc: "pd-list at lists.iem.at[pd-list at lists.iem.at][pd-list at lists.iem.at[
>>>>>> pd-list at lists.iem.at]]" <pd-list at lists.iem.at[pd-list at lists.iem.at][
>>>>>> pd-list at lists.iem.at[pd-list at lists.iem.at]]>
>>>>>> Betreff: Re: [PD] Moving Sum object?
>>>>>>
>>>>>> Well, a linear moving average filter is just something that  sums a
>>>>>> series of samples. If you don't want the average but rather the true sum,
>>>>>> either multiply the output by the number of samples or take my abstraction
>>>>>> and get rid of the [/~] object.
>>>>>>
>>>>>>
>>>>>> Gesendet: Dienstag, 08. Dezember 2015 um 12:21 Uhr
>>>>>> Von: "Alexandre Torres Porres" <porres at gmail.com[porres at gmail.com][
>>>>>> porres at gmail.com[porres at gmail.com]]>
>>>>>> An: "Christof Ressi" <christof.ressi at gmx.at[christof.ressi at gmx.at][
>>>>>> christof.ressi at gmx.at[christof.ressi at gmx.at]]>
>>>>>> Cc: "Matt Barber" <brbrofsvl at gmail.com[brbrofsvl at gmail.com][
>>>>>> brbrofsvl at gmail.com[brbrofsvl at gmail.com]]>, "pd-list at lists.iem.at[
>>>>>> pd-list at lists.iem.at][pd-list at lists.iem.at[pd-list at lists.iem.at]]" <
>>>>>> pd-list at lists.iem.at[pd-list at lists.iem.at][pd-list at lists.iem.at[
>>>>>> pd-list at lists.iem.at]]>
>>>>>> Betreff: Re: Re: [PD] Moving Sum object?
>>>>>>
>>>>>> cool guys, but i was asking for an average "sum" object :)
>>>>>>
>>>>>> 2015-12-08 9:19 GMT-02:00 Christof Ressi <christof.ressi at gmx.at[
>>>>>> christof.ressi at gmx.at]>:Hey Matt,
>>>>>>
>>>>>> there's no need for the feedback path (and therefore no [block~ 1]
>>>>>> ;-))
>>>>>>
>>>>>> Just use the following formula:
>>>>>>
>>>>>> y[n] = (y[n-1] - x[n-k])/k
>>>>>>
>>>>>> where k is the number of samples to be averaged (must be at least 1).
>>>>>> see the patch I sent to Alex in my last mail.
>>>>>> it uses [rpole~ 1] for the y[n-1] part and [z~ k] for the x[n-k] part
>>>>>> (you can replace the latter one with a [delwrite~] [delread~] pair to make
>>>>>> it purely vanilla).
>>>>>>
>>>>>> The funny thing about linear moving average filters is, that although
>>>>>> it can be implemented as a recursive filter (like in both our patches), it
>>>>>> is still a FIR filter (and therefore it defeats the notion that recursive
>>>>>> filters are always IIR filters). The impulse response is just a rectangular
>>>>>> pulse and therefore finite.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Gesendet: Dienstag, 08. Dezember 2015 um 07:13 Uhr
>>>>>> Von: "Matt Barber" <brbrofsvl at gmail.com[brbrofsvl at gmail.com]>
>>>>>> An: "Alexandre Torres Porres" <porres at gmail.com[porres at gmail.com]>
>>>>>> Cc: "pd-list at lists.iem.at[pd-list at lists.iem.at]" <
>>>>>> pd-list at lists.iem.at[pd-list at lists.iem.at]>
>>>>>> Betreff: Re: [PD] Moving Sum object?
>>>>>>
>>>>>> Something like this? Almost completely untestsed. :D
>>>>>>
>>>>>> On Tue, Dec 8, 2015 at 12:20 AM, Alexandre Torres Porres <
>>>>>> porres at gmail.com[porres at gmail.com]> wrote:
>>>>>>
>>>>>> Talking about averages I wonder if we have an object that sums (in a
>>>>>> moving average fashion) a series of samples
>>>>>>
>>>>>> cheers
>>>>>> _______________________________________________
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>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>
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