Static,hissss, hum!

I hooked up my edirol-fa-66 to my macbook & had a lot of noise,but finally got rid of it by tuning off a radio ,& giving the edirol it's own electric wall socket, silence. Today i have a little hum, it is from the patch cord going into my guitar. I tightened the input, it was loose, & taped down patch cord to guitar(to stop it moving , i don't know if it will do anything). Is there anything else i can do , does anyone make a noise filter.

it is gone

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FIOS phone line static/buzzing/humming problem.... any ideas!

So I have FIOS phone, and my phone has a loud background hum noise when I'm on a call. When I plug a phone directly into the ONT, there is no hum. So clearly, there is something going on on my end.
But 2 issues:
1) It wasn't always there - I think this hum only started up a month or so ago, and
2) when I UNPLUG the ONT (so it's running on emergency battery power), then there is no hum on any of the lines.
Any ideas?

Hum is easy to cause. Probably a wire disconnected partially, grounded, or something else in your enviroment that changed is being picked up. If possible trace the wires looking for problems.
Possibly something going wrong with the BBU transformer, since you mention it goes away when you are on battery power.

Recommended earphones for ZMP to minimize static noise probl

Concerning the Zen Micro Photo known issue interference with the OLED:
Can anyone help me to find out which headphones will eliminate the static noise/humming sounds from the OLED-Display best?
Here are my experiences so far:
- Static noise even more noticeable on the EP 630 earphones than on the cheaper ones the ZMP comes shipped with (EP 480 I think).
- Absolutely no noise on my HiFi-headphones which is an AKG K 280 (but unfortunately by far too big in size for outdoor use)
- Also no static noise and humming when connecting the ZMP to an amplifier via line-in.
- No noise when inserting the headphone jack just halfway so it makes mono output (strange...!) with any earphones.
Is it true that it is only a matter of impedance? My AKG headphones have 75 ohms while the EP 630 only have 6 ohms.
Are there any small earphones with a high impedance?
Thanks for helping!!!

Cool. Hopefully someone will benifit from this .

Microphone doesn't work when unplugged and plugged in

I was trying to record something the other day and was wondering why I had to have the gain on the microphone turned up so high. After a while I figured out that audacity was recording with my internal microphone (dell laptop). I tried using the external one and finally got it to work if I had it plugged in when I rebooted. The second I would unplug it and plug it back in though my computer would start recording off my internal microphone. So, I can use the external as long as I don't unplug it after I have booted. What???
`amixer scontrols` gives this:
Simple mixer control 'Headphone',0
Simple mixer control 'Speaker',0
Simple mixer control 'PCM',0
Simple mixer control 'Mic Jack Mode',0
Simple mixer control 'IEC958',0
Simple mixer control 'IEC958 Default PCM',0
Simple mixer control 'IEC958 Playback Source',0
Simple mixer control 'Capture',0
Simple mixer control 'Digital',0
Simple mixer control 'Mux',0
Simple mixer control 'PC Beep',0
There is only one capture listed, and I'm thinking there needs to be two. When I was using Ubuntu I know there was two, but I didn't really pay attention on Arch. Also, here is the output from `arecord --list-devices`:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
I also updated alsa some time ago, which I'm not sure if it has anything to do with, but from a recording I did on December 5 which doesn't sound like it has all the hum I get now I assume it had something to do with the upgrade.
[2009-12-31 12:23] upgraded alsa-lib (1.0.21.a-1 -> 1.0.22-1)
[2009-12-31 12:23] upgraded alsa-plugins (1.0.21-1 -> 1.0.22-1)
[2009-12-31 12:23] upgraded alsa-utils (1.0.21-1 -> 1.0.22-1)
[2010-01-03 11:51] upgraded alsa-utils (1.0.22-1 -> 1.0.22-2)
[2010-01-05 18:27] upgraded lib32-alsa-lib (1.0.21.a-1 -> 1.0.22-1)
Does anybody know why this is happening?

I had similar problems after a recent upgrade. I hadn't tried rebooting with the mic plugged in, but all I get now is static and hum when I go to record. I'm working on my desktop and both the front and back plugs give the same results. I couldn't find anything in the alsa package changes that would have done it and am not that familiar with alsa to begin with. Any alsa experts? I also lost a device on upgrade. :-/

Modems

currently using dsl (att 2wire); keeps knocking me off line and doesn't have extended range. Can I get rid of it and use airport? just purchased hp printer (for air printing with iPad2) cannot connect the printer to modem...suggestions

I typically do not blame the modem for connection loss, since normally the problem with DSL would involve deteriorating lines. In very rare occasions, a line may actually gain distance if it was rerouted due to line work.
Since the connection began dropping, have you noticed your phone service, should you have it from Verizon, reducing in call quality? This would include noises such as static, buzzing, humming, popping, and reduced audio quality in the call despite a clear sounding line. If you do not have Phone Service, please let us know if the problems began since canceling phone service, if you had it in the past with DSL.
========
The first to bring me 1Gbps Fiber for $30/m wins!

Pops, beeps, general slowness/choppiness, random crashes, oh

first off, thanks beforehand for the help.
I just got the audigy 2 zs (not platinum or anything, just the plain one) and after having installed it and the software, I'm getting strange beeping sounds, pops, and real sluggish performance when I play games. Let me clarify; by games, I mean really low tech 2D sort-of games - DROD if anyone knows about that, and stuff from Popcap.com mainly. Also, I've had the system lock up completely (which is something that I have never experienced ever with XP until I got this card in) at really random times. Once, I wasn't doing anything and it just froze; the next time was right when I started a game, and the third that I remember was after my mom played a game for about an hour. An aside: Winamp works fine; I've played mp3s and cd's with no problems. Videos work OK for the most part, but I do get occasional slowdown and beeps/pops etc. (so it seems like something is really wrong with any kind of video+sound combo.)
i probably won't know what all specs you'll need for a diagnosis, so I'll just give some of the basics. Windows XP Pro SP2. Pent III 933 Mhz. 384 megs ram (not any of the fancy DDR or anything.) I've got a PCI Radeon 7500 which I'm sure is doing something. I have onboard sound and video, but my BIOS only lets me disable the video; I've only disabled sound through the device manager. I would like to use some 2. speakers and headphones with this card once I get it to work right. Oh and I meet all the said system requirements for the card. I'm sure I forgot something, so if needed I can supply a dxdiag or whatever.
what i've already tried:
. moved the card physically as far away from everything else in the box. it's now in a corner all by its lonesome. the pci graphics card is 3 pci slots away, which I suppose isn't ideal, but I only have 4 slots, so it's all I can do. I also cleaned up the wires as much as I could (I didn't mess anything up by doing that because there were pops and cracks before I cleaned the wires up.)
2. I cleansweeped and reinstalled just as the instructions in the faq said.
3. I lowered hardware acceleration of graphics one notch and nothing happened. I can try more, but it didn't seem to have an effect.
4. under the "Essential Troubleshooting ... Static, noise, humming, etc." article in the knowledgebase, I wasn't able to do many of the suggestions for various reasons (don't use onboard graphics, don't have agp, bios doesn't let me fiddle with a lot of that stuff, or I wasn't sure how to do what they recommended.)
5. tried getting latest drivers off of this site, but no difference.
6. I've used two sets of speakers (one set of speakers and one pair of headphones) so it's not that.
7. checked that dma access was on.
What I didn't get to do:
. turning off acpi
2. reinstalling windows
3. updating bios (I've tried but cannot find any info on what mobo I have)
4. and like I mentioned, I couldn't disable my onboard sound other than by disabling it in device manager. My bios might not let me turn it off unfortunately.
Sorry for the long post, but I wanted to answer as many questions as I could before they were asked.

well I don't mind too much if they take a few days to answer, but I do know that there ought to be an answer and a fix. i never saw any mention on the system requirements or any of the other research i did before buying this that said "will not work with a pci graphics card." basically, I don't want to have shelled out 80 bucks for a card that can't even match the quality of my onboard sound.
also, a quick update: after having turned hardware acceleration all the way down, I noticed that this only fixed the problem with a few programs. strangely, music started popping and beeping where beforehand it had not. also movies were acting strangely as well. so basically that "fix" didn't fix the problem so well after all. this weekend I'm going to try a thorough defrag, but first I'll need to free up some space. it still seems strange to think that my sound card would only work if my hard dri've wasn't fragmented, but I'll give it a shot.
edit: oh yeah, and I want to email tech support too and tell them to look at this thread, but I don't know where my model number is printed, and the "help file" on this site that says where to find it has the audigy 2 zs conveniently left out. also, it says "no technical problems please" on the tech support page. what does that mean?
Message Edited by timmothias on 06-8-2005 07:52 PM

SPEAKER "HUMMING/STATIC" SOUND...AGAIN! Please help!!!

I sent in my MBP on the 27th of August, got it back yesterday. i have been using it all day today, and the speaker hum/screech from the right speaker is back again!!!!
I have a 15" 2.16 C2D, 1gb ram and all that stuff.
Here are the stuff they "fixed"
630-7709 PCBA, LIO/AUDIO (M59) MBPRO 15"
632-0430 FLEX ASSY, LIO/AUDIO,(M59) MBPRO 15"
Now when i use the computer, the hum is very noticable especially when the room is quiet. I need this laptop for school, and I've been without it for 2 weeks. What's going on? Also, my laptop is running at 128F* is that normal?

Does this sound problem occur all the time - even on battery power miles away from the house?

Inspire 6100 5.1 - static from the front middle satellite

Speakers are new. I've just bought them and brought home to set up.
Probably should have connected them and checked right away before setting everything up.
So I connect the speakers, switch them on and... I hear static from the middle speaker.
I checked if i haven't set the volume too high. Nope. Volume settings have no effect on the volume of the buzz. Then I connected the middle speaker to different slot. No humm. Connected other speaker to the middle speaker slot - it was humming too, disconnected the subwoofer from pc - middle speaker humming.
It's not that loud. If there's any noise or sound in the room it's almost unnoticable but in silence or when I move closer to the speaker it's annoying. I wuld expect something like this from some of these 'noname' speakers you get for free with PC sets but not from Creative product ;/
Can i fix it somehow? Is it something normal I have to learn to live with or should I make a complaint?
Message Edited by arracht on 06-27-2007 05:07 AM

Hi
checkup if you have the speaker too closer to some font of magnetical power or something else.
cumpz and sorry my english

40rv52u won't start, loud static, solid green light, no backlight

Hey everyone,
     So, it appears that we had a brownout yesterday, and it also appears that the brownout has jacked up my trusty Toshiba 40rv52u (2008, 40 inch LCD).
     Upon plugging in the device to power, it immediately attempts to turn on, at which point the green power light comes on, but no backlight, no fan sound, no humming, no picture, no nothing. Just a cheeky little green light that claims everything is fine.
     When left alone, after about 5-10 seconds of being "on," the television begins emitting this horrible, intermittent, 90's modem-style-SCREECHING static at near maximum volume through the internal speakers.
     The TV will respond to both the Power Switch on the unit itself, as well as via the Toshiba Remote Control. The same effects are present regardless of which power on method chosen.
     Toshiba Phone Support had me power off the television for a short while (I've already left it unplugged overnight, pressing POWER periodically to drain the capacitors), and attempt to clear any remaining power by holding the POWER BUTTON for 20s. To no avail. He also had me try doing a few things with the Remote, which also didn't work.
     I'm wondering if this is a common side-effect of serious damage. My TV has actually done this little gig once before, at which point I unplugged everything, left it off for 30m, and attempted to restart and it came back just fine like normal.
     I don't have any other issues with the television, and when it isn't doing this it actually appears to work just fine, have no problems switching resolutions (used as computer monitor via HDMI), changing settings, switching channels, navigating the menus. Even the onboard speakers work fine, although they don't get used.
     Is there a secret factory reset function somewhere? Has my Television really just been destroyed, even through a surge protector? Does the loud static interference sound point to anything specific? I saw some others on a different forum referring to loud static sounds potentially indicating a bad "SMPS" (Switching Mode Power Supply).
     The Toshiba rep pointed me in the direction of a local servicer, but the problem is that it's hardly worth it to spend $150USD-$250USD on repairing a Television that I purchased for near $300ish in the first place. . .3 years ago. . .or more. . .
     Anyway, thanks for help, hopefully somebody else has encountered this before, maybe with some better results than I have so far. Thanks!

Honestly, leaving it unplugged from power is the closest to thing a secret factory reset. As far as I'm aware, it soudns like it requires servicing. Maybe someone else in the community will have a different idea.
- Peter

Noise/hum in signal chain

When playing electric guitars and basses I'm having problems with hum:
1--noise in my amps (amps are solid state)
2--with guitars or basses plugged directly into a usb interface, there is hum...more hum when the iBook is plugged in than when it is running on battery power
I've tested the guitars, pickups, and cables sufficiently to rule them out as the source. There isn't hum when recording acoustic instruments and voice with microphones.
This leads me to believe there's an issue with the electric in my room/house. I don't have experience with electrical stuff, but I've heard about special power strips that address issues with grounding. Anyone have solutions/suggestions?

I unplugged the speakers cables and the noise was still there -- so it's interference, nothing from the Mac itself. It's like crackily static, and the loudness increased when the Mac started a new download.
I think it's the Wifi!
My old MPro was hardwired to ethernet but I'm using the wireless chip on the nMP until I can run cable over to it. So that radio must be pumping out enough signal to mess with the speakers, that's possible no? I also have Bluetooth turned on for the mouse.
FYI M-Audio DX-4s.

'Static' freezes MacBook Pro, 100% repeatable (related to trackpad)

Whenever I am in a hurry and run back to my desk, (settling in to 'get back to it')
.....IF.........the first thing I touch is the trackpad, the computer freezes. Every time, 100%
It's totally frozen (to any input). The cursor is blinking though, so then I press the power button and it asks if I want to restart, but it's still frozen thus I can't choose any of the 4 options (one of which is restart), and I end up having to hold the power button down to force shutdown.
I now KNOW the problem, but it has been difficult to re-learn how to touch my computer, especially when I am in a HUGE hurry.
But anyway I'm reading thru this forum seeing that lots of folks are having trouble with MBPro freezing. And the ONLY time mine EVER freezes is when I give the trackpad an (assumed) jolt of static electricity. If I run across the office and touch the trackpad the computer freezes, it's 100% repeatable.
I told Applecare about it and they said "ho hum" (two different techs). Applecare does not seem to have a place for user information, (or they didn't believe me). This is after calling them on 4 separate occasions, resetting the Power Management Unit (4 times), threatening to re-install the O/S, making appointments for hardware tests, etc etc etc all kinds of trouble.
I'm pretty sure of it, I have frozen it like this at least 10X now.
SO, I hope this helps folks. If your Macbook freezes after you run around on carpet picking up static electricity, sit down and relax just a little while, and bleed off that static before before you touch your MBPro trackpad. Or touch the metal case first, NOT the trackpad. I have never 'noticed' an electric shock, I am just assuming it's due to static because of the behavior. Get in the habit of waking it with the SHIFT key, for example.
It wold be great if anyone has hints how to un-freeze it (after the keyboard and mouse are frozen) so if (when) it happens again I don't have to force-shutdown.
Message was edited by: TomSeattle
Message was edited by: TomSeattle

Hi
Thanks for the reply.
Not feeling a static discharge simply means it is below the threshold, it doesn't mean there wasn't a discharge.
I'm pretty certain of this as I developed the theory, then watched it happen, like clockwork, at least 5x since. And as I said, it is 100% repeatable. I'd be happy to demonstrate this to Apple, but I barely have enough time in my day to endure the restarts, or to call applecare,,,,, certainly not enough time to go to the Genius bar to demonstrate this. And they probably have some kind of antistatic carpet there.... However if a Genius was interested enough to stop by my office I'd gladly demonstrate it.
..... jut trying to help folks narrow down a freeze problem. I was pretty happy to find mine, and not have to call applecare again.
Tom
Message was edited by: TomSeattle

MacBook Pro External Speaker Hum With External Display

When I plug my MacBook Pro into a set of external speakers, I get a loud-to-deafening hum depending on the volume that the speakers are set to. However, this only happens if I have an external monitor plugged in. I unplugged the macbook, and this did not stop the hum, and I turned off the extra display and this did not stop the hum, neither did actually unplugging it from its power source, the only thing that stops it is taking the vga cord out of the displayport to vga adapter.
Any ideas as to why this hum happens? It's not always just a static hum either, occasionally there are crackles, like from a record or something.

thinking that you are using a stereo cable 1/8" to 1/8" there can be a few explanations to that .. one the cable could damaged internally mixing audio signals .. or it can be that the wiring diagram is a bit off ( the jack has 3 connectors on it ) ..or the input you use on your speakers were not meant for a stereo cable .. the jack input you use on your speakers could be damaged ..or that hole you plug them in was not an input at all
Now that you are over the problem .. These don't really matter much ..
Take care

Can't we declare a static variable inside a memberfunction of a class?

Hi,
class A{
public void fun()
static int i=10;
can' we declare static variable in member function of class?
Thanks,

It is a common idiom in C and C++, but it is forbidden
in Java because it adds hidden dependencies.
The C way of writing a serial number generator:
int generate() {
static int n = 0;
return n++;
}Pure C has only global functions. So it needs inner
static variables to help to hide the data. I've had
lots of headaches trying to make C programs with inner
static variables work correctly because they usually
are hidden in cross-reference listings.
The Java way:
public static class SerialNumberGenerator() {
private static int n = 0;
public static int generate() {
return n++;
}The code above is as static as the C code given
before, but it tries to be more explicit (no hidden
variables).Hum... have you tried to compile your sample ?
(And anyway, what the hell would a static class be used for ???)
But perhaps you meant:
public final class SerialNumberGenerator {
   private static int n = 0;
   public static int generate() {
      return n++;

Static only when importing

Apologies if this has been answered already, I searched the help menus and forum to no avail even though similar but not exactly the same problems are cited.
Anyway...
I have uploaded over 3000 tracks from CD without a glitch. Importing one disc today (new and legitimately pruchased)it hung for an age, locking up the p.c. When it finally imported it was scratchy and distorted in sound, almost as though my speaker cable were loose and touching something metal (which I have checked). I cleared the albumn from my playlist and tried another.
At first this too seemed to have the same problem only I have now narrowed the problem down to the fact that all tracks played, either from the importing disc, the library or indeed the music store samples are distorted if I play them while importing.
Once the import ends all is right again. Reboots, virus / spyware scans, firewall settings and other usual external fixes have been tried.
Bare in mind that this now happens 100% of the time, 100% of discs, only during import and only since the troublesome import.
Any suggestions?...and not listening while uploading is not a contender, I still have to sit here and upload another 3,000 tracks and aint gonna whistle while I do it.
Thanks in advance!
Windows XP Pro AMD Athlon 4.2htz dual processor.

Hi,
In the past I have had a similar issue with one board (mic was giving a backgroung humm ie static noise).
The cause was revealed quite few months later as the board finally died... as the board had been originally installed around 1,5 years ago - there was some extra metal board connector under the motherboard in the computer case which wasn't "screwed in" - it was just supporting the board, not grounded and therefore causing a short circuit. That caused the humming and finally also killed the board.
So, be sure that all the screws are properly tightened and there's nothing touching the board or it's components which could short circuit.
- Tom

Why is audio output so static-y when used with dvi/svideo?

Hi,
I like to connect my MBP to my TV to watch shows and movies. I connect the video to the TV with an S-video cord, which is connected to my laptop via an DVI-to-SVideo adapter I bought from the apple store. I connect the audio to the TV with a mini-to-RCA cable.
The problem is that when both the video and audio cables are connected to my laptop, the audio coming from my laptop and out of the TV sounds really bad and static-y. If I unplug the DVI adapter (and lose the video connection), the audio sounds perfect. So this suggests to me that the DVI adapter/S-video connection is somehow interfering with the audio.
Has anyone else had this problem? Any suggestions about ways to fix it or possible workarounds? Perhaps another way to connect to my TV that I haven't thought of? (My TV only has Svideo and RCA inputs).
Thanks so much in advance for any advice or suggestions!
Jamie

No pat answer, and I don't setup like that, but some questions:
-Do you mean that the sound is bad when the S-Video is connected and 1) the sound cable is connected to the TV and 2) also sound is bad just through the MBP speakers (sound cable not connected to TV)?
-Not sure what "really bad and static-y" really means - is there loud hum?
-Have you tried reducing the MBP playback level and increasing the TV volume level?
-Have you tried running the MBP on battery power?

Static,hissss, hum!

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