X-FI interferen

Hey,
I recently bought with my new system an X-fi Xtreme Music sound card.
Now, I've noticed a high pitched squeal that changes when hard dri'ves/processors being used, like you'd expect in on-board sound when you increase the volume.
It becomes even more apparent when using headphones.
FIX:
Weird thing is, this only happens alot on the Entertainment mode, and when switching to Audio Creation mode, there is no interference, and in gaming mode, theres only slight interference.
Whats this about? I'm using standard analog btw.
IF I used Coaxial, would inerference stop completly? I'm guessing so?
CONCLUSION:
Even so, my Creative Sound Blaster Li've card from 5 years ago or more never suffered from the problem...
Its on the bottom PCI port, so it can't be any further away from components that could cause it.

[Solved]
It seems like the drivers that came with the CD were very old. Upgrading to the new ones has stopped the interference completly.

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50 Hz interference with DSP

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My language is Spanish.
I purchased recently talking Pearl 2.0 Bluetooth Hanxo. Use with a notebook Lenovo ThinkPad T61p, operating system Windows Vista ultimate with SP1. Built-in Bluetooth, therefore use the mouse (Microsoft mobile memory mouse 8000).I have located the speakers two metres of my notebook, and i have interference. If i disconnect the mouse blutooth, and i connect the speakers no interference.I have all drivers updated by Lenovo - system update - Is there to fix this? Alberto.

Hi,
Consider changing you BBID user name -
KB28060 How to change or update a BlackBerry ID username on the BlackBerry ID website
KB32514 How to change or update a BlackBerry ID username on a BlackBerry smartphone
tanzim
If your query is resolved then please click on “Accept as Solution”
Click on the LIKE on the bottom right if the post deserves credit

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Hi,
I have problem with analog input measurement. I am using NI PCIe-6351 for measuring voltage signal from 3 sensors - accelerometer (differential connection to AI4) and 2 pressure sensors (differential connection to AI0 and AI1). If I measure signal from accelerometer and pressure sensors separately using SignalExpress everything seems working. However if I measure these signals together it looks like they influence each other, concretely analog signal of accelerometer increases value of pressures during dynamical measurement. Measuring only pressures looks all right.
Behaviour of signals is shown in the figure below. Upper two figures show separate measurement of signals AI0 and AI4, bottom figure shows signals measured together/simultaneously (signals are noisy but they should be constant).
Thank you so much for your suggestions.
Jaroslav Bušek
Attachments:
ni.png ‏15 KB

Dear Jaroslav!
If I understand your image correctly, the issue is the oppositve of what you described, so the accelerometer (AI4) is being affected (offset by a fairly constant DC value) by the pressure measurement (AI0). What is your measuring frequency?
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Best regards:
Andrew Valko
NI Hungary
Andrew Valko
National Instruments Hungary

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Hi All,
We're using the NI 6602 as part of a wireless communications receiver for pulse generation and rotary encoder interfacing. For precise time synchronization of data acquisition, an external timebase must be used with the pulse generation task, so we've been using a 10MHz (or 1 MHz) square wave derived from a master oscillator as external timebase. The 10MHz TTL square wave is injected into the unshielded terminal block (CB-68LPR) on PFI39 (CTR0 SRC) and travels down the shielded cable (SH68-68-D1) to the PCI 6602. A problem which has encountered is that harmonics from this 10MHz (or 1MHz) timebase are appearing in our measured signal. Note that we're measuring radio frequencies in the range of 30MHz to 80MHz. As you might know, signal levels at the front-end of a receiver are typically very low (order of microvolts), so even a small amount of interference can cause serious problems. In this case it seems some of the square wave energy is being radiated and picked up by the receive antenna. If the square wave is disconnected, i.e. the shielded cable is disconnected from the terminal block or computer, the problem goes away.
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Hello Axiom,
Your system sounds pretty complicated so I didn't completely understand
your setup; however, I do have a couple suggestions for you.
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Having a shielded connector block may fix the problem depending on how
close your connector block is to your antenna.
Second, you might want to take a look at the Field Wiring and Noise Considerations for Analog Signal Tutorial, there are quite a few noise considerations you might want to take into account.
Finally, the characteristic impedance for the SH68-68-D1 cable is 125
ohms differential @ TDR and 79 ohm single ended @TDR. I doubt
that the interference you see is because of an impedance mismatch
however.
I hope that helps,
Micaela N
National Instruments

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Solved!
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http://www.finehomebuilding.com/PDF/Free/021190076.pdf
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http://www.lutron.com/CMS400/WorkArea/downloadasset.aspx?id=19725

X-FI interferen

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