Software With Multiple Notch Filters?

kelticwizard · 27th May 2011, 05:15 AM

I have just thought of a project that requires multiple adjustable notch filters-at least a dozen.

Anyone know of software, preferably not too expensive, where this capability exists?

phofman · 27th May 2011, 05:30 AM

sox, effect bandreject . You can chain as many effects as required. E.g. digital notch filter to eliminate hum ? | LiveATC.net

boris81 · 27th May 2011, 06:51 PM

I like the kx-project. It looks a bit intimidating at first but it's actually really easy and convenient to use.

It is a FREE custom driver for the Creative Audigy sound cards (about $30 on eBay). It allows for a multitude of user-defined signal routing and filtering on the DSP. The UFX plugin has some great filters that are really easy to use.

dlr · 30th May 2011, 01:49 PM

Quote:

Originally Posted by kelticwizard

I have just thought of a project that requires multiple adjustable notch filters-at least a dozen.

Anyone know of software, preferably not too expensive, where this capability exists?

Let me ask what the application is? Software is available that will correct for any non-flat response in the SPL on-axis. If you plan to use a PC, check out the Ultimate Equalizer from Bodzio Software.

Dave

kelticwizard · 05:19 AM

First of all, much thanks to everyone for their helpful replies-sorry I did not get back sooner.

phofman: From what I can gather, sox is from the linux system? I don't have linux on this computer, (although I have been wondering about it for some time). If so, how difficult is it to install linux on a Win7 Starter computer and learn it?

Boris81: I have a netbook, so I would need an outboard Audigy. Only thing is, there is a chance I might want to try Bodzio software down the line for measurement purposes and that would indicate an Maudio outboard card.

On the other hand, this is just a fun project, so $30 or so for an Audigy card wouldn't hurt and I can worry about Bodzio later.

Will any Audigy card work?

DLR: That Ultimate Equalizer is fascinating, the thing is it was made on a 64 bit Win7 machine and my netbook uses 32 bit Win7. I could upgrade by buying a 4MB memory stick-it has only one-and installing Win7 64 bit, but the cost for this fun project, when added to the $150 for Ultimate Equalizer, might be overboard.

On the other hand, I am considering simply buying a new Win7 desktop with 64 bit version already installed solely for the purpose of loudspeaker measurment, and installing Bodzio software. In which case, Ultimate Equalizer would be right up my alley.

Would be nice if they gave you a break on the price of Ultimate Equalizer if you bought Speakeasy at the same time, though.

kelticwizard · 2nd June 2011, 05:33 AM

I might as well describe what my project is, though.

A guy I have become friendly with from another forum-a pro football fan site-plays clubs for a living and embedded the following video there:

YouTube - ‪Jim DiBatista‬&rlm;

I love the song and liked the way he played it, but it is definitely marred by the sound of other voices in the bar.

So for fun I thought I would experiment with lowering the voices in the background. I decided on the following strategy. For each of the four midrange octaves:

A. Determine which key the song is played in-I could do that just by PMing him on the other forum.

B. Place notch filters in the spaces between the notes on that key.

The idea behind this is that while his voice and guitar will be on the notes, the background voices will fall mostly between those notes, and be suppressed by the notch filters. Do one octave at a time, record, and do the next of the four midrange octaves.

I'm speculating that this process will raise the level of the voice and guitar in relation to the background voices. Figured it would be worth a try anyway. the idea just popped into my head a few days ago, and I want to give it a go.

phofman · 2nd June 2011, 06:53 AM

Sox is multiplatform, you can download a windows binary too, e.g. the latest version http://sourceforge.net/projects/sox/files/sox/14.3.2/

I am afraid the way you are planning to remove the noise will not work. Tones played by instruments/voice do not produce a single frequency, there are numerous harmonics and other components.

You might want to learn about noise filtering, lots of info is available on internet, but it is a pretty complicated subject.

27th May 2011, 05:15 AM	#1
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	Software With Multiple Notch Filters? I have just thought of a project that requires multiple adjustable notch filters-at least a dozen. Anyone know of software, preferably not too expensive, where this capability exists? __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

2nd June 2011, 05:11 AM	#5
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	First of all, much thanks to everyone for their helpful replies-sorry I did not get back sooner. phofman: From what I can gather, sox is from the linux system? I don't have linux on this computer, (although I have been wondering about it for some time). If so, how difficult is it to install linux on a Win7 Starter computer and learn it? Boris81: I have a netbook, so I would need an outboard Audigy. Only thing is, there is a chance I might want to try Bodzio software down the line for measurement purposes and that would indicate an Maudio outboard card. On the other hand, this is just a fun project, so $30 or so for an Audigy card wouldn't hurt and I can worry about Bodzio later. Will any Audigy card work? DLR: That Ultimate Equalizer is fascinating, the thing is it was made on a 64 bit Win7 machine and my netbook uses 32 bit Win7. I could upgrade by buying a 4MB memory stick-it has only one-and installing Win7 64 bit, but the cost for this fun project, when added to the $150 for Ultimate Equalizer, might be overboard. On the other hand, I am considering simply buying a new Win7 desktop with 64 bit version already installed solely for the purpose of loudspeaker measurment, and installing Bodzio software. In which case, Ultimate Equalizer would be right up my alley. Would be nice if they gave you a break on the price of Ultimate Equalizer if you bought Speakeasy at the same time, though. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous Last edited by kelticwizard; 2nd June 2011 at 05:19 AM.

2nd June 2011, 05:33 AM	#6
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	I might as well describe what my project is, though. A guy I have become friendly with from another forum-a pro football fan site-plays clubs for a living and embedded the following video there: YouTube - ‪Jim DiBatista‬&rlm; I love the song and liked the way he played it, but it is definitely marred by the sound of other voices in the bar. So for fun I thought I would experiment with lowering the voices in the background. I decided on the following strategy. For each of the four midrange octaves: A. Determine which key the song is played in-I could do that just by PMing him on the other forum. B. Place notch filters in the spaces between the notes on that key. The idea behind this is that while his voice and guitar will be on the notes, the background voices will fall mostly between those notes, and be suppressed by the notch filters. Do one octave at a time, record, and do the next of the four midrange octaves. I'm speculating that this process will raise the level of the voice and guitar in relation to the background voices. Figured it would be worth a try anyway. the idea just popped into my head a few days ago, and I want to give it a go. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

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27th May 2011, 05:30 AM	#2
phofman diyAudio Member Join Date: Apr 2005 Location: Pilsen	sox, effect bandreject . You can chain as many effects as required. E.g. digital notch filter to eliminate hum ? \| LiveATC.net

27th May 2011, 06:51 PM	#3
boris81 diyAudio Member Join Date: Oct 2009 Location: white plains, ny	I like the kx-project. It looks a bit intimidating at first but it's actually really easy and convenient to use. It is a FREE custom driver for the Creative Audigy sound cards (about $30 on eBay). It allows for a multitude of user-defined signal routing and filtering on the DSP. The UFX plugin has some great filters that are really easy to use.

2nd June 2011, 06:53 AM	#7
phofman diyAudio Member Join Date: Apr 2005 Location: Pilsen	Sox is multiplatform, you can download a windows binary too, e.g. the latest version http://sourceforge.net/projects/sox/files/sox/14.3.2/ I am afraid the way you are planning to remove the noise will not work. Tones played by instruments/voice do not produce a single frequency, there are numerous harmonics and other components. You might want to learn about noise filtering, lots of info is available on internet, but it is a pretty complicated subject.

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