hi everyone,
i would like to clean a signal coming from a noisy microphone.
what i have in mind right now:
remove low-frequency noise below 50 Hz bandpass filter (for voice *) global amplitude scaling (realtime normalizer?) limiter~ hip~ 5 (remove dc)
- The voiced speech of a typical adult male will have a fundamental
frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz
any advice is welcome (also patchs and externals). pat
Your hip~ at the end isn't needed if you've already got one at 50hz, I'd be very cautious of trying to band pass just the fundamental tones of voice too, there's a lot of harmonics in the human voice, not to mention bits of 'noise' signal (like the 's' and 't' sounds) which need treble to be heard as language. I'd look for a compressor in PD to get a little more volume. Normalizing, by it's very nature, can't be done live, but a good compressor is a similar result (reducing the higher peaks then increasing the overall volume, Having said that, any ground sound from your microphone etc, might be increased by this approach, but it would by normalizing samples too.
Have a look to see if you can find a workable noise gate too, these cut a channel when the input drops below a given volume, often used for live vocals, so the gate opens when there's sound into a mic.
Date: Thu, 27 May 2010 02:58:37 -0400 From: puredata@11h11.com To: pd-list@iem.at Subject: [PD] microphone cleaner advice
hi everyone,
i would like to clean a signal coming from a noisy microphone.
what i have in mind right now:
remove low-frequency noise below 50 Hz bandpass filter (for voice *) global amplitude scaling (realtime normalizer?) limiter~ hip~ 5 (remove dc)
- The voiced speech of a typical adult male will have a fundamental
frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz
any advice is welcome (also patchs and externals). pat
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On Thu, May 27, 2010 at 12:15 PM, Andrew Faraday jbturgid@hotmail.comwrote:
Your hip~ at the end isn't needed if you've already got one at 50hz, I'd be very cautious of trying to band pass just the fundamental tones of voice too, there's a lot of harmonics in the human voice, not to mention bits of 'noise' signal (like the 's' and 't' sounds) which need treble to be heard as language.
...given that, a band pass can still be useful, but the upper limit shall be set far above 255hz. Actually, i think even the lower limit will be higher than 255hz, or around that. My recommendation is to try a 300-3000hz band, and of course to listen and adjust accordingly.
Andras
First "noisy mic" doesn't mean anything, you need to listen and describe the noise to understand it. broadband or narrow band? periodic or intermittent? hum? crackles? And I'm not trying to be funny but I would really eliminate the noise before the signal hits Pd. If it is for live input you can't really use an fft based noise reducing process and filtering out parts of your signal only makes the sound even worse. There are no noisy mics, perhaps yours is broken and you need to replace it. A reasonable dynamic mic doesn't cost a lot, so do quality soldered cables.
Jurgen
2010/5/28 András Murányi muranyia@gmail.com
On Thu, May 27, 2010 at 12:15 PM, Andrew Faraday jbturgid@hotmail.comwrote:
Your hip~ at the end isn't needed if you've already got one at 50hz, I'd be very cautious of trying to band pass just the fundamental tones of voice too, there's a lot of harmonics in the human voice, not to mention bits of 'noise' signal (like the 's' and 't' sounds) which need treble to be heard as language.
...given that, a band pass can still be useful, but the upper limit shall be set far above 255hz. Actually, i think even the lower limit will be higher than 255hz, or around that. My recommendation is to try a 300-3000hz band, and of course to listen and adjust accordingly.
Andras
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hi everyone,
on the market there is microphone that have a feature called noise cancellation for a better speech quality. this is what i am trying to achieve with pd.
my microphone is not that noisy (for a diy 6$ microphone): http://www.workinprogress.ca/electret-microphone-amplifier/
but the environment is (computer fan for example).
pat
a noise cancelling mic would require 2 capsules, one cardioid pointing the the wanted source (you) and another picking up the opposite direction assuming that's where the noise is and then phase inverts the 2. as the noise hits both capsules at the same time but at opposite phases it should work quite ok.
Jurgen
On Fri, May 28, 2010 at 1:47 AM, patrick puredata@11h11.com wrote:
hi everyone,
on the market there is microphone that have a feature called noise cancellation for a better speech quality. this is what i am trying to achieve with pd.
my microphone is not that noisy (for a diy 6$ microphone): http://www.workinprogress.ca/electret-microphone-amplifier/
but the environment is (computer fan for example).
pat
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hi,
i found this external:
drown~ was designed to function as a noise reduction processor. It is an adaptive spectral filter which scales the amplitude of frequencies that fall below a specifiable threshold by scaling them by a specifiable amplitude factor; this results in either noise reduction or noise increase. drown~ thus provides a variety of possibly dramatic spectral modifications that will bring you award-winning acclaim or your money back.
in fftease~ http://puredata.info/Members/hans/FFTeaseBuilds
well, i will forget about the noise cancellation, i don't want to make another microphone. i will try to simply implement something like:
remove low-frequency noise below 50 Hz (maybe not needed anymore (drown~)?) drown~ bandpass filter (for voice *) noisegate global amplitude scaling (some kind of compressor) limiter~
pat
This technique has quite a distinctive sound, tho. Football commentators always used to have this slightly hollow sound to their voices, a result of this same phase-inversion.
Date: Fri, 28 May 2010 04:04:06 +0800 From: noise.now@gmail.com To: puredata@11h11.com CC: pd-list@iem.at Subject: Re: [PD] microphone cleaner advice
a noise cancelling mic would require 2 capsules, one cardioid pointing the the wanted source (you) and another picking up the opposite direction assuming that's where the noise is and then phase inverts the 2. as the noise hits both capsules at the same time but at opposite phases it should work quite ok.
Jurgen
On Fri, May 28, 2010 at 1:47 AM, patrick puredata@11h11.com wrote:
hi everyone,
on the market there is microphone that have a feature called noise cancellation for a better speech quality. this is what i am trying to achieve with pd.
my microphone is not that noisy (for a diy 6$ microphone):
http://www.workinprogress.ca/electret-microphone-amplifier/
but the environment is (computer fan for example).
pat
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