what de f**ck is that man : always positive waves...

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Mehdi_T
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Post by Mehdi_T »

if I find that patch...... no problem to upload it for your scientific researches :smile:
ps : mp3 on the post before that one.

<font size=-1>[ This Message was edited by: Mehdi_T on 2004-07-08 06:04 ]</font>
Mehdi_T
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Post by Mehdi_T »

Lucky you(s), I found the patch which is now being uploaded in the Modular Patch forum.
http://www.planetz.com/forums/viewtopic ... forum=15&0
More info about the wave sample : the Patch actually produces a few waves under zero at a moment , but actually, that's the part which is not hearable/horrible.
Only the "pure DC" part produce a useable sound.
So, i didn't remember, but in the sample in this thread, I edited it and removed all the "non DC parts" (which are horrible frequencies at high volume).
However, I didn't do anything else than cutting the "overdriven" parts of the sample, so it can still be said that the picture/sample directly comes out of that modular patch (at least for the "linear" parts".

Only the "DC part" is useable whereas, if I understand well, it should not produce any sound.

Also, my mistake, it's not wavetable oscialltors, but sin+partials in a variation of the granuliner Patch for Mod 3.

So what, is it me ? the modular ? any way to get a normal wave on the "nicesound" parts ?

I don't really understand, i have low knowledge about electricty (all i know about electricty is that i must plug the computer before it can work :smile:(well, i'm pretty good at soldering stuff from tube mics to A16 :smile: ). Thanks for the help !

It could be the way I recorded it (in cubase SX 1 if i remember), but all the other modular, samples , synths etc recorded on the same session do not show such "effect".

k, now, i go get some sleep too...


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<font size=-1>[ This Message was edited by: Mehdi_T on 2004-07-08 07:32 ]</font>

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Warp69
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Post by Warp69 »

I haven't looked at the patch (dont like modular), but the signal is rectified. This can happens for several reason - you talk about modulation by a osc? They have the following range -max to +max, but if the destination only accepts positive values, you'll get a rectified signal (since every value below zero will be zero).

Just guess.

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spiderman
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Post by spiderman »

i'm use to have the same with fm synthesis ( with a tx802 ) . the wave has not the same peak above or under the 0 line .
for me it's not a dc ofset stricly speaking !
you can have the same with a record made with a mike ; some time if the pressure is to hot ; the capsule don't move equaly around is zero position . it's happend for me some time when recording brass for exemple.
naturally with synthesis you can obtain a more extreme example of this
blazesboylan
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Post by blazesboylan »

Mehdi, you can still move a speaker with strictly positive DC variations, but the speaker is really not designed for it. If the speaker does respond then the resulting sound pressure wave would, in fact, be alternating (positive / negative).

I'll take a look at the patch tonight, this is a fascinating one! :smile:

Johann
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nprime
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Post by nprime »

just a note. amplifier designer's usually take precautions to ensure that DC never gets to your speakers, they really don't like it.

I don't know what kind of a sound this is, but I wouldn't feed it to my speakers.
Mehdi_T
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Post by Mehdi_T »

you can Look at it here http://www.planetz.com/forums/viewtopic ... forum=15&0 :smile:

What I don't understand, is why my speakers stillwork (cause i mixed the thing at really high volume with no problem - but i used a hifi amp between the a16 and the speakers may be it protected them, don't know). It is possible that a cubase SX update changed this.... and it's ok everywhere i listen to the track (may be i saved something with Eqs, i don't know). but i'll do the DC blocking Alfonso advises.

fm : yes i know what you mean spiderman. (i can get a quite funny screenshot of that too :wink: but well, another day hehe)

<font size=-1>[ This Message was edited by: Mehdi_T on 2004-07-08 15:40 ]</font>
samplaire
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Post by samplaire »

On 2004-07-08 15:29, Mehdi_T wrote:
I don't understand, is why my speakers stillwork
The sound wasn't constant for a long while, was it? Was the sound of the synth the only one at the moment? Other sounds they are in the music cause the speaker to shake which means ventilation and cooling for the wires. Only a quite long listening to the sound could damage the speaker, I belive.
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nprime
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Post by nprime »

You know, if it's truly DC than you shouldn't be able to hear much coming out of your speakers.

A positive Direct Current would push the cone out to it's maximum excursion, thereby making it impossible for the cone to move back and forth, therefore no sound. You can test to see if a driver has suffered failure by putting the terminals across a nine volt battery; the cone will move out to maximum and stay there. I suppose that the amount of DC current may be a samll enough that it only pushes the speaker out part of the way, instead of out to maiximum. Then you would hear sound but your speaker should crap out at any kind of volume, as it has nowhere left to go with the DC keeping it pushed out.

When you zoom waaaaay in does it still look like a straight line?

I wondering if this is a rendering error...

DC bad!

<font size=-1>[ This Message was edited by: nprime on 2004-07-08 21:05 ]</font>
husker
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Post by husker »

Hmmmm...curious thread!

Virtually every amp has it's signal AC coupled via a capacitor, which 'filters' the DC component...so you will end up with a somewhat 'mangled' audible waveform without the extreme DC offset, there won't be any negative going signal, but the speaker excursion will be from 0 (rest) to +ve (in or out depending on polarity of speaker wiring)...
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wayne
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Post by wayne »

On 2004-07-08 07:47, spiderman wrote:
you can have the same with a record made with a mike ; some time if the pressure is to hot ; the capsule don't move equaly around is zero position . it's happend for me some time when recording brass for exemple.
i experience this all the time with low brass.
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