Background static noise?

Post your questions & get help from friendly LibriVoxers
Post Reply
cstew64
Posts: 31
Joined: August 20th, 2019, 4:42 am

Post by cstew64 » August 24th, 2019, 2:39 pm

Hi everyone,
I started my test recording today. For some reason, I can hear static in the background.
I am using audacity on Windows 10. The Mic I chose is the USB Pro-Mic condenser. Uni directional microphone with pop filter.

I have adjusted recording volume levels both on the mic and audacity. It's still there????

Any advice is greatly appreciated.

Cheers

TriciaG
LibriVox Admin Team
Posts: 42662
Joined: June 15th, 2008, 10:30 pm
Location: Toronto, ON (but Minnesotan to age 32)

Post by TriciaG » August 24th, 2019, 2:43 pm

If I'm not mistaken, uni-directional means that it's picking up sound from every direction, correct? So that makes a bit of sense. You could try piling towels, pillows, or something else soft behind the mic, if you can, to cut sound from that direction.

Some static can be native to the mic. My suggestion is to post the 1-minute test so that we can hear your static (how bad it is) and offer specific suggestions.
Experiences in the Panama Canal Zone during construction: Zone Policeman 88
Insomnia Collection - boring works 30-70 minutes long
Australia & New Zealand history: LINK

cstew64
Posts: 31
Joined: August 20th, 2019, 4:42 am

Post by cstew64 » August 24th, 2019, 4:21 pm

Great! Thank you. here is the url for the test recording.

Thanks again.


https://librivox.org/uploads/tests/LibriVox_test.mp3

tovarisch
Posts: 2726
Joined: February 24th, 2013, 7:14 am
Location: New Hampshire, USA

Post by tovarisch » August 24th, 2019, 4:26 pm

Tricia, "unidirectional" is not the same as "omni-directional" and the latter is the pattern which picks up the sound equally well from all directions ("omni" means "all" in Latin).

cstew64, are you sure you selected your microphone in Audacity? It may not be your default one. If you have any other microphone (pre-dating your new one), it might be the default source of sound... Did you start Audacity after plugging the mic in or before?
tovarisch
  • reality prompts me to scale down my reading, sorry to say
    to PLers: do correct my pronunciation please

tovarisch
Posts: 2726
Joined: February 24th, 2013, 7:14 am
Location: New Hampshire, USA

Post by tovarisch » August 24th, 2019, 4:32 pm

cstew64,

I just downloaded and listened to your recording. It's not static. It sounds a bit like mains hum or your computer's fan or some kind of interference. Record a few seconds of just this noise (without speaking), give it a more specific file name and upload it again.

Most likely it can be cleaned out. Some inexpensive microphone's circuits are not very well isolated from interference, so noise reduction effect is your friend.
tovarisch
  • reality prompts me to scale down my reading, sorry to say
    to PLers: do correct my pronunciation please

TriciaG
LibriVox Admin Team
Posts: 42662
Joined: June 15th, 2008, 10:30 pm
Location: Toronto, ON (but Minnesotan to age 32)

Post by TriciaG » August 24th, 2019, 4:35 pm

tovarisch wrote:
August 24th, 2019, 4:26 pm
Tricia, "unidirectional" is not the same as "omni-directional" and the latter is the pattern which picks up the sound equally well from all directions ("omni" means "all" in Latin).
I stand corrected. Call it a mental lapse after strenuous physical activity today. :)
Experiences in the Panama Canal Zone during construction: Zone Policeman 88
Insomnia Collection - boring works 30-70 minutes long
Australia & New Zealand history: LINK

cstew64
Posts: 31
Joined: August 20th, 2019, 4:42 am

Post by cstew64 » August 24th, 2019, 5:46 pm

Here's an audio file with no voice. Just the static.


https://librivox.org/uploads/tests/no_voice_static_sound_test.mp3

KevinS
Posts: 2951
Joined: April 7th, 2019, 8:32 am
Contact:

Post by KevinS » August 24th, 2019, 6:01 pm

cstew64 wrote:
August 24th, 2019, 5:46 pm
Here's an audio file with no voice. Just the static.


https://librivox.org/uploads/tests/no_voice_static_sound_test.mp3
Audacity's noise reduction can clean that right up. You should have no problems.

In the winter I run a heater with a fan at my feet and audacity does a great job in removing its 'hum.'

Do you how this is done? I can explain it, I think.
E agora, José?

tovarisch
Posts: 2726
Joined: February 24th, 2013, 7:14 am
Location: New Hampshire, USA

Post by tovarisch » August 24th, 2019, 6:14 pm

cstew64 wrote:
August 24th, 2019, 5:46 pm
Here's an audio file with no voice. Just the static.


https://librivox.org/uploads/tests/no_voice_static_sound_test.mp3
Thank you. The "noise floor" on this is quite low. If amplified a ton (like 30 dB), then we can hear that it's mostly static with a few frequency spikes at 100Hz, 180Hz, 200Hz, 240Hz, etc., which suggests that some current seeps in. It's very mild. Very. As Kevin says, the noise reduction will make it even less noticeable. See this wiki page for more.
tovarisch
  • reality prompts me to scale down my reading, sorry to say
    to PLers: do correct my pronunciation please

cstew64
Posts: 31
Joined: August 20th, 2019, 4:42 am

Post by cstew64 » August 24th, 2019, 6:26 pm

Thanks everyone! All your help has put me at a bit more ease. Appreciate all the responses.

Post Reply