Low frequency buzz on Headphone out p

when I hook up my stereo input to my sound card Headphone out port I get a low frequency buzz noise. Is there any way to eliminate it's

dbruchez wrote:
when I hook up my stereo input to my sound card Headphone out port I get a low frequency buzz noise. Is there any way to eliminate it's
Use the Headphone-out port for headphones only (use line-out #-3 for feeding external amplifier(s)).
jutapa

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I have isolated the following issue to audio that is monitored via the headphones output on the back of my iMac:
I've been encountering a very high-pitched (and at times a cycling through high frequencies) noise when working with headphones to monitor audio. It's not the headphones and the problem is not limited to any single application. The noise is sometimes barely audible, and it comes and goes - but repeatedly and often. Sometimes the frequency of the noise is so high that I can imagine that those with poor or compromised hearing wouldn't even notice it. But the highest frequencies are still detectable - kind of like a faint ringing in the ears or a ringing television set that has its volume turned all the way down.
I've done everything I can imagine to troubleshoot the problem including asking a Mac genius, but nobody seems to have encountered this before. The noise can be triggered off (not masked) by any other incoming audio, but eventually it reappears. I will be editing a file, the noise will appear, and I can literally silence it for the moment by pressing a volume key or playing back a portion of audio.
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OK, It is very easy to reproduce the problem, just follow this steps:
(1) Insert any headphones to iMac.
(2) Do NOT play any iTunes or any application with sound.
(3) Now, set volume with the volume control keys on your keyboard, set it to the MAX.
(4) You can keep pressing on the increase volume key and every time you hit the key you should hear a sound.
Just as when the sound stop, you will hear a high pitch. Keep repeat step 4 and wait a while, then occasionally you will hear a high pitch sound that will last to longer than 30 seconds. The high pitch will be even easier to reproduce if you alternate before decreasing volume and increase volume by 1 level, each time, wait and you will hear the high pitch too.
This high pitch sound can be heard on external speaker plug into the headphone jacks too.
BTW, I turned OFF WIFI, Bluetooth, removed all USB devices except keyboard and mouse, adjust monitor brightness, they have no effect on the high pitch, it is still there!
I am going to call the Apple Care tomorrow. Will keep you guys posted.
Message was edited by: chienlim

Some kind of buzz/noise coming out of the desktop speakers when I connect my iPhone 6 plus to my desktop speakers. Help?

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I have my Imac hooked up to my home studio for recording music. It is currently hooked up to my high quality rane mixer, which has superior sound quality. But for some reason every time I plug a cord into the headphone jack to my mixer, TV or anything else from the Imac headphone jack, it comes out with a very loud low frequency humming/buzzing noise even on very low volume settings, even with the bass turned all the way down. It is extremely annoying. Does anyone else have this problem? I would expect a little more from apple products. Especially with something simple like this, since these machines are mostly designed for video/audio production. . I have tried switching my cords around and changing my setup for months now. No luck. And, no, my imac does not have an optical out and I think that would probably solve the whole problem. Any ideas would be greatly appreciated. Thank you for reading.

Welcome to the Apple Discussions!
Do you have your recording equipment isolated from the computer equipment? These buzzes and rumbles are usually easily solved by making sure that your audio equipment is plugged into a different electrical circuit than the iMac.
However, yes your iMac does indeed have digital audio. I do not know of an Intel model that does not have digital audio. The audio ports do both analog and digital audio. To use digital audio you need a Toslink cable with a miniplug adapter on the iMac end of the cable.
Such as this;
http://www.amazon.com/gp/product/B00016W6Y6/pfrd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00016W67I&pf_rd_m=ATVPDKIKX0DER&pf_rdr=063C32X7YE311VH2T7WY
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Any solution to DVI noise via Headphone out?

Have posted before but I have a new i7 Macbook Pro 8GB running fine.. and I want to use the Analog/Headphone out to 2 x phono left/right into a USB Soundcard.
This is fine for recording loops from the Macbook to another editing computer, and the levels were way down at -90.0 which is almost silence.
I now have a DVI adaptor (apple) from the Macbook Pro to a DVI Dell Monitor fine, and now I have terrible buzzing, earth hum, noise!
This obviosuly ruins the recording process as I need my 2nd Monitor hooked up to the MBP. After googling this problem, it seems many many users have this same annoying problem and Apple still produce laptops with the noisy analog out?!
Is there any cure for this?
I tried to use the headphone out as Digital SPDIF out which is silent, but I can't monitor in the same way via the USB soundcard on the other machine, so that makes that tiresome and awkward. I even bit the bullet and bought a good 'ground loop isolator' to put between the Macbook output lead and the input to the soundcard lead, and that still makes no difference?
It seems to be the DVI port powering another monitor that causes this. Is there a simple solution to stop the noise?
Help!

I am not familiar with the Bumper unit, it seems very low priced, but it would be hard to believe it does not use the standard solution - a transformer, even an inexpensive one.
In the states, I have used a Radio Shack unit for this problem as an inexpensive solution which appears similar to this Maplin device:
http://www.maplin.co.uk/ground-loop-isolator-33172
The gold standard device is probably the Jensen like this:
http://www.jensen-transformers.com/ci2rr.html
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Low frequency Voltage measurement

Hi,
I am using PCI 6025E to control load bank and to measure voltage, current and frequency of a generator.
While current and frequency measurement is not a problem, voltage measurement is toublesome.
Since on test bench already there are few PCI boards and huge number of sensors, I do not want to add NI 9205 or any other additional boards and clutter the area (other people are also working there).
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2, Using high precision voltage Divider. The problem is that what should be the galvanic isolation? Isolation transformer, but then again low frequency problem.
Hence could someone suggest me since there is a bit confusion in my head.
Thanks.
Solved!
Go to Solution.

If you have a sine generator (15Hz migth be hard for the soundcard ) you can do a calibration of your transformer.
(If only the voltage amplitude is of interest , use a isolated DMM as reference and run your generators)
Or you buy a isolation voltage sense amplifier. (weidmueller, phoenix, wago, ...)
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

How do I get the line-in to record low frequencies?

The iPhone with GarageBand is potentially one of the most powerful tools for mobile recording ever. Unfortunately there are several tragic yet avoidable drawbacks that reduce it to nothing more than a mere toy. 1. You can't use the camera usb adapter to bring in loss-less digital stereo input. 2. Even if you could, you can't split the stereo into 2 seperate mono tracks. And to take the cake... 3. You can't do much recording with the 3.5 jack's line-in because you get ABSOLUTELY NO LOWS! This is due to the iPhones roll-off low frequency limiter filter, which i'm told since ios6 can possibly be disabled, though it's not in the Settings and i have yet to find an app that will do it in the background while running Garageband. Sure, the Garageband app could do that, but then it would be a powerful incalculably valuable tool in the hands of everyone. No lows means no drums, no bass, and vocals that sound like...well...like they were recorded via telephone. Yes, it's painfully clear you recorded that demo on a phone, because when you play it back in your home or car it sounds like your listening to someone play it for you on the other end of a phone call. There is no adjustment to compensate for the absence of low frequencies. SOMEONE PLEASE TELL ME I AM WRONG and that you have a work-around or know of something I've missed. How do you get lows into Garageband???

Thanks for the info. I am not wanting flat stereo nor digital input from the 3.5. Only wanting flat mono. But before I go the apogee route (which is a $150-200 solution, not to mention a solution that will add more devices to the connection and thus more opportunities for noise), I will probably just resort to purchasing an ipad (can get a mini for $299) . My mixer has usb out, and I can go straight into the ipad digitally with the usb camera kit, albeit I still can't split 1 stereo channel into 2 mono channels. But I digress: my entire purpose for this post is that i would like to stay as mobile as possible by using the iphone, but with all the darn limitations imposed by no one other than Apple, what could be an easy way to record has been nullified. What's frustrating is that all the components are there and I have them, all the hardware is more than capable; but in both cases (the 3.5 mono or the usb stereo) there is a software feature (or lack thereof) blocking me.
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I am tyring to produce a power spectrum graph for a Tachogram data, related to Heart Rate Variability Analysis. This data can be thought to be as a random signal, but has a frequency spectrum range of 0 - 1HZ.
The problem that I am facing is, I am getting very high values for very low frequency region, closer to DC value. Even the DC value is really high, in the range 10^8. It is suppose to be a low number. Any suggestions would be appreciated.
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Here R1 is the time instant at which the spike R1 occurs, and R2-R1 is the time difference between these peak occurences. So, if we plot these values, then it gives us one like what you saw on your time domain plot. What we have to do with this signal is, we have to apply FFT technique to produce its power spectrum for analysis. Generally the frequency range of the spectrum goes from 0 - 0.5 Hz. They part this range into VLF, LF, and HF, and analyze how much power is distributed in these regions. The distribution would tell you if you were stressed out,or have worked out, things like that. Normally, you can view spikes around LF, HF region. If you had viewed the power spectrum for the data that I sent, then that's what it pretty much looks like. I think I have said a lot about it now. Hope you get it.
We were talking about the "other component", I can't really see where it lies, must be in the 60-80 sec. range in the graph. If you look at the spectrum, I am getting a huge value around 0.0033 Hz, how do I minimize or remove this ?
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I'm using a X-Fi XtremeGamer soundcard in a Gigabyte GA-P35-DS3L MOBO running windows vista 32bit,? and Logitech X-540 speakers with monster cable RCA cables.
About a month ago I started noticing that low frequencies (Bass drum, explosions, bass guitar) in songs, video games, etc. were being distorted and muffled. It sounds like the sounds are coming out of a massi've amp in another room behind 3ft. of concrete.
At first I thought it was my speakers, so I replaced my old set with the brand new logitech speakers and brand new cables. No help
Then I uninstalled all my creative software and drivers, and took the card out. Switched on the integrated audio chipset on my MOBO from BIOS and downloaded the latest drivers for that. The sound quality improved slightly.
Next I uninstalled the drivers for the integrated chipset, turned off, popped the sound card back in, turned off the integrated chip,? installed the drivers from the CD, then updated with the latest? SBXF_PCDRV_LB_2_5_0006 driver. Back to the original problem.
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I have exactly the same problem - especially with the sound track in games like Far Cry2, Fear2 etc - low frequecy sound heavily distorted, just as you describe. Same result with all settings tried. Low frequecy sound in movies is fine.
I have? a 2. speaker setup, and am wondering if something is simply not seperating frequecies correctly - trying to make the subwoofer handle? frequecies that should go to the normal speakers?
Message Edited by ArchPrime on 03-29-2009 08:3 [email protected]

Is it possible to detect low frequency signals with a high sampling rate?

Hello everyone,
I'm having an issue detecting low frequency signals with a high sampling rate. Shouldn't I be able to detect the frequencies as long as the sampling rate is at least 2 times the highest frequency I will measure? The frequency range I am measuring is 5-25 Hz, and I use Extract Single Tone.vi to measure the frequency. The sampling setting I am using is 2 samples at 10 kHz. Is there a method I can use to make this work?
Attached is the vi.
Attachments:
frequencytest.vi ‏21 KB

You are sampling at 10Ks/S, but only taking two samples. What do you expect to see? If your signals are binary (On or Off) you would only see either an on or an off, or if the rise/fall time was fast and you were Extremely lucky, one of each. If you want to see a waveform you have to sample for at least the period of a waveform. So you should take samples for at least 0.2 seconds to capture an entire waveform at 5Hz, ideally longer. Think of looking at a tide change at a dock. If you want to see the entire tide change you will probably have to measure repeatedly over 24 hours, not just run out on the dock, measure the height twice and leave. That wouldn't tell you anything other than at that precise moment the tide height was X, but not that it was at high tide, low tide, in between, etc.
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Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

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I have noticed this sound comming from my Mac, and frankly, it hurts my brain.
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Hello guys
Thanks for all your sugestions I have the final results. I got it to work but I would like to add some comments for anybody who is trying to attempt this.
Triggeing on the gate is a must for low frequency measurements. I used the divide by sugestion however using a factor of 3 only gets you about 60 Hz after that you can't sample fast enough. My application required me to measure from 0 to 150 Hz. I added a "gear shifter" routine where the terminal count was set to 3 on frequencies lower then 45 Hz and 15 for frequiencies greater than 45 Hz. Using a terminal count of 15 for all measurements made the udate rate on really low frequencies way to slow i.e. .5 seconds for 20Hz (check the math on this).
I a
lso needed to cascade the counters. At low frequencies the count went higher than 6550. Using the previos channel function of the fieldpoint module enable me to get 32 bit worth of terminal count data.
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My Macbook Pro has a strange issue that I can't find anything about.
I often have speakers/headphones connected to the headphone out port. However, all sounds are a little distorted... as if they were being played through very very cheap speakers. At first I thought something was terribly wrong with my Shure headphones, however when connected to an iPod (with the same audio files) they sound great.
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anyone?
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Low frequency buzz on Headphone out p

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