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Thread: Please help - To Choose Clean Audio (Loud Humming noise Comes from outside)

  1. #11
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    Quote Originally Posted by Steenamaroo View Post
    Beaten to it ^. I was going to say, having listened to the clip, this sounds like noise in your immediate environment.
    If you take your headphones off/mute your speakers, do you hear this noise 'live'?

    Where possible it's always better to get rid of the source of noise rather than use noise reduction/removal techniques.
    Saying that, your original 'clip one' did sound OK, but if this is a loud computer fan or ventilation system that you can adjust, or move away from, I'd do that first.

    If this is not a noise that you can hear in the room, I'd suspect maybe the mic, or some other piece of gear, is faulty.

    I'd describe this is white noise rather than hum.
    That might sound pedantic but hiss, hum, buzz all sound different and all can mean different things.

    It can help to remember that it's all relative. If you stay quite close to the microphone and speak at a good volume that can help a lot.
    The noise remains the same level but your voice, relative to it, is much louder.

    Thank you

    1. Yes I can hear the noise with my ears, all the time (at least at night noise sounds too loud because it's all quiet all around)

    2. It's not computer fan or vent or Air conditioner, trust me. Neither I run fan nor Air conditioner while recording even it's 48 degree temperature here. All this noise comes from outside and my floor vibrates and I also found that machine has big old era fan which makes Broom droom noise, may be that's the reason you suspected it's fan/Air conditioner noise...

    Let me explain, earlier I reduced the gain (in audio interface so that mic picks up less noise) that's why it sounded like Air Conditioning noise whereas its not


    So now I increased the gain and noise is more clear .

    I tried low pass filter in my mic but that didn't do well.

    Based on your suggestions:

    Note: So now I adapted a different approach:
    1. I changed my sitting position
    2. Now mic is too close to my mouth
    3. Gain level is increased
    4. I also make sure fan, air conditioning etc.. not even run in adjacent rooms (in fact in my room I already don't run em while recording).

    5. Most importantly now I recorded the noise for 30 secs (I don't know what to call it may be it's not hum but surely it's kind of noise) and afterwards I started speaking something. Now I'm providing you "Audacity Project files" and also "Raw Audio", and the "clean audio which I cleaned via audacity" so that you can analyze:

    Dropbox -_Raw_Audio--and--Audacity_project.zip

    I believe if we come to know what kind of noise it is then you may suggest me a specific way to cure this audio.

    I'm so much grateful to you for your priceless efforts, I really wish to fix this issue so that I start doing my work, thank you guys, you are Great, Genius

  2. #12
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    If the noise is from outside of your home/apartment and out of your control then there's no fix, as such. Just damage limitation.

    The best you can do is
    1: Get as close to the mic as possible
    2: Speak as loudly and clearly as possible
    3: Get the gain as low as possible (1+2 facilitate this)
    and
    4: If necessary use noise reduction or a noise gate to help with whatever noise remains.

    Your original post Clip One sounded perfectly acceptable to me so, to be honest, I'd run with whatever you were doing there.

    Put it this way; If I looked up a tutorial on something and that (Clip One) was the voice over I heard, I wouldn't be distracted or annoyed in any way.


    As a side note, you have my sympathy. I doubt I could sleep with that noise.
    ---------- Steenaudio Website ----------

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    Some localities may have ordinances regarding man-made noise and allowable levels. I used to work for an electric utility and a few substations that had large transformers were required to install acoustic sound barriers to reduce a constant audible hum they produced to get noise levels down to an acceptable level in nearby neighborhoods. If you and your neighbors could establish that the noise disturbs the quality of life (sleep for example) in the vicinity of the noise source, possibly the owner of the 'machine' may have to take measures to reduce the noise in some way. Whether you and neighbors could succeed in this effort may depend much on where you live and local laws and regulations.

    Guidelines for Drafting Municipal Noise Control Ordinances - FindLaw
    Mark.......

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    I use to have that. The street right outside my house was a 4 lane busy city street.. I had an issue here at my new place. Periodic noise, even though I turn the HVAC off, and the computer is in a soundproof ISO box. I had forgotten about my refrigerator. It was two rooms over but, when it kicked on, my mic would pic it up ever so slightly. I have to adjust the temp settings while tracking to keep it from coming on.

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    I used your raw file and examined ONLY the noise. It appears that the rumble is somewhere close to 130Hz. Using Audacity's equalizer, I removed 130Hz and below and it helped, but there is still quite a bit of white noise from the room.

    Noise Profile.mp3. .Noise Profile with 130 Hz notch.mp3

    If your voice seems too thin, you can boost around 200-300 Hz to add body.

    Unless you can boost your vocal, either by being much closer, or by speaking louder, you may never get the noise level sufficiently low.

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    When you have an external amount of noise that is intruding there are some things to try.

    1. If the microphone has a PAD switch, use it, and put the microphone closer to the source, i.e., your mouth, the guitar, whatever. This will change the signal-to-noise (S/N) ratio. It will impact the quality because of proximity effect, but you can use EQ to remove some of that.

    2. Reduce the gain on your interface - this will do something similar to the PAD switch, forcing you to move the microphone closer to the source.

    At this point, I'll add that one reason mics like the EV RE-20 are popular for voiceover/radio is because they take care of some of these issues by being low sensitivity and having a design that also mitigates somewhat the proximity effect of being close to the microphone.

    So, now you've got a better S/N but lower gain - make sure you are recording at 24-bit depth, and you can have peaks that are still quite below what you might be thinking should be "normal" yet when you increase the gain on the track in post, you'll have less noise in the result.

    Also, experiment with microphone position. It's quite likely that the noise isn't coming in from everywhere, and so you have to find the wall that is most naturally insulated from environmental noise - maybe it's a closet, or the kitchen is on the other side, or a room where they sleep quietly, whatever. Then, make sure the microphone is facing that wall, put a heavy blanket or any kind of padding/treatment behind you. The idea being that all of the environmental noise in the room is bouncing around, but the cardioid pattern of the mic picks up just what is most directly in front of it, so after you have the source close to the mic, you further reduce any noise coming from the same direction by "soaking it up" before it can reflect off the wall facing the microphone.

    I have to believe you can get a better signal recorded before you have to apply noise reduction.
    "... I know in the mornin' that it's gonna be good
    when I stick out my elbows and they don't bump wood." - Bill Kirchen

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    Cat,
    *just thinking aloud and troubleshooting any overlooked obvious-

    You said: "...All this noise comes from outside and my floor vibrates...."

    Do you have the mic in a shock mount? Is the mic stand on the vibrating floor? OR are you using an articulated boom arm with springs? I have velcro'd the springs on mine because they were resonating with my deep voice. Is the mic cable on the vibrating floor and dangling from the mic and mic connector? (I Velcro strap my mic cables to the boom and try to keep them off of the floor or any object that may transmit vibrations via the cable.
    Dale

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    I assume you live in an appartment or condo situation where neighbors are very close. The hum sounds to me like a neighbor's air conditioner sound from the outside or maybe a large window fan. The vibrations are probably because this sound is either directly above or below you making the continuous studs that you share with your neighbor vibrate.

    If this is an apartment or condo, you might be able to complain with this neighbor to see if he could include something to lessen the vibration. I doubt the noise can be lessened, unless it would be replaced with a more sound proof unit. But, keep in mind that if this is your neighbor, stay pleasant with them as unless there is an ordinance in your area that requires him to deal with this, he will be dealing with hit out of the kindness of his heart to make you happy.

    Personally, I lilke #1 over the other two, and unless you go into a lot of work to remove the hum from your audio, it sounds pretty good to me in that first clip. So, confronting the neighbor would be your call.
    Music ~ the International Language

  10. #19
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    Quote Originally Posted by Steenamaroo View Post
    If the noise is from outside of your home/apartment and out of your control then there's no fix, as such. Just damage limitation.

    The best you can do is
    1: Get as close to the mic as possible
    2: Speak as loudly and clearly as possible
    3: Get the gain as low as possible (1+2 facilitate this)
    and
    4: If necessary use noise reduction or a noise gate to help with whatever noise remains.

    Your original post Clip One sounded perfectly acceptable to me so, to be honest, I'd run with whatever you were doing there.

    Put it this way; If I looked up a tutorial on something and that (Clip One) was the voice over I heard, I wouldn't be distracted or annoyed in any way.


    As a side note, you have my sympathy. I doubt I could sleep with that noise.
    Thank you, heartfelt thanks, I know I was expecting too much.

    I sincerely appreciate all your efforts, you all are here so generous, kind and caring folks

  11. #20
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    Quote Originally Posted by TalismanRich View Post
    I used your raw file and examined ONLY the noise. It appears that the rumble is somewhere close to 130Hz. Using Audacity's equalizer, I removed 130Hz and below and it helped,
    Is there a way you can share (via screencast etc... ) how did you remove rumble which was close to 130Hz ?

    If not possible then please let me know which of these tutorials on YT are close to the technique you used to remove rumble, I already searched:
    YouTube

    but it seems like unless we know the reliable source on YT any tom dick and harry shares their own version of removing rumble ?




    >but there is still quite a bit of white noise from the room.
    as far as I know white noise could be come from fan or AC, vent running at distance. Is it possible to remove white noise in any way? (I want to save your time so if there is a long explanation then please don't write, as I already owe too much to you guys for helping me )


    >Unless you can boost your vocal, either by being much closer, or by speaking louder, you may never get the noise level sufficiently low.
    I Will Do this for sure


    >If your voice seems too thin, you can boost around 200-300 Hz to add body.
    You guys are GENIUS, you come to know everything just by listening to the audio. Yes, My voice is thin that's why i bought this mic: MXL 770 it's a lot better than other mics I used to have. Could please tell me how to do this? Is it by going to Audacity -> Effects -> Equalization -> dragging the graph line to 300Hz


    Thank you looking forward to your reply.

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