PULSAR - ANALOG INPUT HISS NOISE PROBLEM

meetme1 · Post by **meetme1** » Wed Jan 04, 2006 4:15 am

Hey all,

I'ving a problem with my pulsar card on the analog input, i have nothing connected to the analog input but i have a hiss noise that disappear only if i remove the analog input device from the project.

Any advices??

Nestor · Post by **Nestor** » Wed Jan 04, 2006 6:23 am

It could be a magnetic problem, or a bad ground. Have you checked your case, is it a good case with proper shelding?

It could also be having your monitors too near your screen, or even too near your case, as electromagnetism can generate electrical activity and so, noise comes out.

Check this first, and be aware of the surroundings, machines, vacuum cleanner, etc., just to start with. Then, when you are sure there are not external reasons for your noise, you so come to the hardware itself.

meetme1 · Post by **meetme1** » Wed Jan 04, 2006 1:07 pm

Thanks for your replay,
but i didnt explain my self clearly...
on the scope fusion platform (SFP) interface,
when i'm plug in the analog input (on the SFP interface) to the mixer (on the SFP interface) on any channle i'm haveing a hiss noise that comes from the analog input even in reality there is nothing that connected to the input on the pulsar.

Hope it'll be good now

Post by **garyb** » Wed Jan 04, 2006 1:15 pm

ALL electronic circuits have SOME noise. it the RATIO of SIGNAL to noise that determines if the noise is excessive. if you just see the bottom led in the mixer lit, that's normal. if it's 3 or 4 leds, then you have a problem.

Nestor · Post by **Nestor** » Wed Jan 04, 2006 1:18 pm

Well, I thought I understood you from the beginning

Did you have this problem before, when it started? Is it a new system or an old one? Which are your components and how do you connect them?

I'm sorry to pose you so many questions, I am acting as if it was my own system, and this is exactly what I would do, to descard whatever is NOT posible before, to the narroy posibilities. Could you please answer these questions?

meetme1 · Post by **meetme1** » Thu Jan 05, 2006 4:08 am

Your questions are correct, this is a used pulsar 2 i bought lately, i think its a virus or something that made this problem, its new problem, i've tried to install the card on other computers and its occur there to, the hiss noise come from the sound card it self and doesnt depend on any connection that connected to the I/O on the card.

Hope it'll help you...

voidar · Post by **voidar** » Thu Jan 05, 2006 4:12 am

Low noise-floor on the analog inputs is a known issue.

meetme1 · Post by **meetme1** » Thu Jan 05, 2006 4:17 am

what is low noise floor and is there something i can do to fix that?

Post by **garyb** » Thu Jan 05, 2006 9:13 am

see my post. what level is the noise?

Herr Voigt · Post by **Herr Voigt** » Thu Jan 05, 2006 4:11 pm

My synths make a little (around -80dB) noise floor, too. They are connected via A/D-converter -> ADAT in. So I dragged three gates in the insert slots of my 1632 mixer, justified the tresholds to -77 dB and a long release time, and all is ok. You could do something similar with your analog input.

Nestor · Post by **Nestor** » Thu Jan 05, 2006 4:22 pm

Please, answer Gary question, so we can start thinking about posible issues...

meetme1 · Post by **meetme1** » Fri Jan 06, 2006 1:34 am

The noise volume is about -68db... but its terrible.

Post by **garyb** » Fri Jan 06, 2006 1:52 am

is the sound a hiss or a hum?

MD69 · Post by **MD69** » Fri Jan 06, 2006 2:29 am

Hi,

If you have unbalanced input (RCA connectors) check for a possible ground loop or poor ground connections.

Might come from the PC Power supply HF noise being reinjected. For grounding, check your local recommendation (depends of your country Power distribution scheme).

<font size=-1>[ This Message was edited by: MD69 on 2006-01-06 02:35 ]</font>

meetme1 · Post by **meetme1** » Fri Jan 06, 2006 4:15 am

thats an hiss sound and i've tried the card on other computer and its hissing there to.
it doesnt have any connection to the rca input, even if i unplug the rca from the card its hissing

meetme1 · Post by **meetme1** » Fri Jan 06, 2006 4:17 am

i think its from the card it self, dunno what to do and the creamware team doesnt answer my mails...
maybe its one of the dsp's...

astroman · Post by **astroman** » Fri Jan 06, 2006 4:18 am

is the hiss changing with window/mouse movement ?

is it (possibly) a Pulsar One in a Pentium 4 system ?
At least my Pulsar one showed similiar values with a P4 - now with the P3 it's -85dB on the same powerline in the same box.

does the backplate of the card have a solid connection to the case metal (painture!) and is the case itself properly grounded ?

cheers, Tom

meetme1 · Post by **meetme1** » Fri Jan 06, 2006 4:35 am

thats a pulsar 2

Nestor · Post by **Nestor** » Fri Jan 06, 2006 5:42 am

If you have moved it to another computer and you still find the same hiss... you should start looking to the card itself. Now, how to taste a card, only Creamware can I think.

MD69 · Post by **MD69** » Fri Jan 06, 2006 6:48 am

@ Nestor

I found that they lack of salt and rather difficult to chew

Cheers