Noise reduction from wav file

hi all,
I want to remove noise from wav file . right now i am using free "Wavepad software" for reduce the noise using Auto spectral subtraction. how can i do this by java.
can some one help me ..............

Does this apply to your previous question of converting your DAT file to a wav?
If so, just run the "auto spectral subtraction" algorithm on your DAT file entries before you convert them to a WAV file...

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Application of Noise Reduction to RAW files on import LR 3.x

The Noise Reduction sliders by default are at the same setting 0 for Luminance and 25 for Color at all ISO camera settings.
Does this mean that the same degree of noise reduction is applied to all raw files?

I have a series of Canon 5D MKII RAW test shots ranging from ISO 100 to ISO 25,600 of the same subject. Checking the affect of the Luminace NR slider in LR shows that it is "weighted" based on ISO. The image shot at ISO 100 shows very little change to the image detail at 100% Luimnace NR setting. The ISO 3,200 shot with only moderate noise looks almost blurred at a 100% Luminace setting. I have no idea what alogorithm is used to determine the weighting versus ISO setting, but clearly there is some weighting applied. I'm guessing it is non-uniform and applied much heavier at very high ISO where noise becomes predominate.

Extract time domain info from .wav file

hi,
I'm new to Labview. I want to :
read (an audio file) .wav file and extract the time and frequency domain information from it.
Pls can anyone guide me to do this task
Thanks in advance

Run this VI, wait till the end of the song and have a look at the diagram. You'll find interesting examples to use a Wav file.
Hope this help you.
PS : this vi was posted by chilly charly he is the one to thank
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
Congrats tBob and friends.vi ‏378 KB

Can I build vst instruments from wave files?

I have a bounce of wave files and would like to use them as vst instruments in Logic. Can I build my own vst instrument somehow?

You can load them into the EXS24.

Audio CD iso from wav files on the shell

I googled around for this but haven't found a solution. I want to take a directory of wav files and write them to an iso file that can be burned off to a CD (a functional audio CD) at a later time. Closest I found is using /usr/bin/genisoimage but it doesn't make an audio CD image, rather, just a data iso.
genisoimage -o test.iso ./music/*.wav

graysky,
this is how a simplified single process script could look like:
#!/usr/bin/python
import os
# Grab all subdirectories within the current directory
search_sub ="find ./* -type d"
dirlist = []
for subdir in os.popen (search_sub):
dirlist.append(os.getcwd() + subdir[1:-1] + '/')
for cur_dir in dirlist:
os.chdir (cur_dir)
os.popen ("shntool cue *.flac > foo.cue")
os.popen ("shntool join *.flac")
You might want to give it a shot at a trial copy of your audio directories.
Edit:
A quick prototype for multiple encoding processes:
#!/usr/bin/python
import os
import multiprocessing
def bincue ():
while not q.empty():
cur_dir = q.get()
os.chdir (cur_dir)
os.popen ("shntool cue *.flac > foo.cue")
os.popen ("shntool join *.flac")
# Init Queue for found sudirectories
q = multiprocessing.Queue()
# Grab all subdirectories within the current directory
search_sub ="find ./* -type d"
for subdir in os.popen (search_sub):
q.put (os.getcwd() + subdir[1:-1] + '/')
cores=multiprocessing.cpu_count()
for i in range (cores):
process = multiprocessing.Process(target=bincue, args=())
process.start()
Last edited by Darksoul71 (2012-07-05 14:47:54)

Create AAC from Wav file doesn't work

I've converted many WAV files to AAC and it worked fine. The last few times I've tried it it isn't working. I hear the bleep which I think indicates it's been converted but I can't find it anywhere so assume it didn't happen.
I have Windows XP. I am running iTunes 10.3.1.55
Any ideas would be appreciated.
Thanks,
Ginny

Hello,
thank you for your Help.
But I just want to read a Binary File, which is build by another program. And this is coded with 8Bit (like a normal Binary File) and not just with 7Bit (ASCII). So the workaround doesn't work in my case.
I posted the Test-VI in my first post (here once again as picture). And it works fine on the PC, but if I try it on my MCB2400 the "Read Form Binary File" Node doesn't work.
And it is also possible to open the Bin file with the "Read Text File" Node and see the cryptic content of the Bin-File. So the Problem seems to be in the "Read Form Binary File" Node.
bye & thanks again
amin
Message Edited by aminat on 09-30-2009 03:28 AM

NOISE REDUCTION FROM BNC Connector 2120

How can I reduce the noise that I am getting from NI BNC-2120? The signal that I am getting from the connector is very noisy.

johnsold wrote:
You still have not told us what DAQ device you are using. The DAQ Assistant is software. What kind DAQ hardware is connected to the BNC-2120? In particular what is the resolution of the D/A converter used for the analog output?
Is your sinusoidal signal 0.05 V or 0.005 V? You gave both numbers.
If you have a 5 mV sinusoidal signal, you will have a rather jagged or step-like approximation to a sine wave. If your D/A converter is 12 bits, then the resolution on a 20 V range is 4.88 mV, or approximately equal to your peak value. Even with a 16-bit D/A you will only have about 16 steps over 5 mV. Either way the signal might look noisy on a scope.
Your program has some strange things. The inner for loop calculates the same simulated signal 10 times and only uses the last one. The outer loop does nothing except to repeat everything inisde. If you want to repeat the analog output, just put the DAQ Assistant inside the loop with all the sign You are using floating point values for indexes. You have duplicated code. You have hidden controls with identical default values. Why not use constants?
Lynn
I was kind of way confused, also. If the noise was 500 mV, how can you even see the 0.005 or 0.05 signal in the first place??? Normally when I have such a noisy signal, I look for issues like a) is something wrong with my probe, or b) am I even hooked up to the right place?
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

How can I amplify audio signals from wav file?(gain control)

I want to develop an audio equalizer using labview. How can I control the gain of the audio signal (amplify) using labview vis.

If your audio signal is in form of a numeric array or a waveform cluster, to amplify it, just muliply it with a numeric value
like in this VI
Regards
Dev
Attachments:
Amp.vi ‏51 KB

Noise reduction on track1 using noise print from track2

I have an audio track from a video project that was recorded on track1 that has a lot of interference from the wirelss mic that was so strong that it crossed over to the idle track2. Track1 has the voice and interference intermixed. Track2 just has the interference. How can I take a noise print from track2 and use it to reduce the corresponding noise on track1? Any ideas?

Bristol87 wrote:
In addition, to make the process more challenging, I am unable to get the audio in the edit frame to play at the same gain as in the multi-track frame. In edit mode I seem to be at a 0db gain whereas the multi-track is playing at over 12 to 20db.
I am also unclear how to get the changes back to Final Cut. When I go to File to save it I do not see a Save option that would transfer the edited audio back to the Final Cut Project.
For the additional items you mention:
1. In your multi-track project, check your volume envelopes on the track, and check the level on your submix and master. To do this, click the the disclosure triangle just left of the track name. You'll see in purple the envelopes section, which is like keyframes in FCP.
2. You have to export a mix to send it back to FCP. Go to File -> Export, save the master mix with a file name, and most likely as an aiff file, then in the dropdown "After Export" choose "Send to Final Cut Pro Sequence."
For your noise reduction questions - applying noise reduction is for broadband, sustained noise, like an air conditioner or a hum. Are you trying to apply the same noise reduction to several files because they have the same type of background noise? I generally just save my settings, but set a new noise print for each file. I'll give you a quick step by step:
Select a bit in the file where there's JUST noise. Then go to Process -> Noise Reduction -> Set Noise Print. Then select the entire file, and go to Process -> Noise Reduction -> Reduce Noise. When the noise reduction window comes up, you just need to listen and play with the settings until you're satisfied with how it sounds. As a starting point, take a look at the level of the noise alone, and use that as the threshold. Usually 100% noise reduction doesn't sound good, but you just have to use some trial and error. Too much sounds worse than too little, in my opinion. When satisfied, apply it and save the preset.
Hope this helps!
Matthew

ITunes will no longer play nor add to the library any mp3 files which I have created by conversion from a wav file.

I am running iTunes 10 on XP Pro and it will no longer play those mp3 files which I have created by conversion from wav files. I tried to delete some from the library and then re-add them but iTunes will not add them back to the library.
Can anyone help solve this, please?

Back up your purchased music before you upgrade, I've read at least 5 cases where purchased music has just gone.....missing.
That is not supposed to happen, didn't happen to me or thousnds of other iTunes users, but you don't want to be the 6th person, do you?
There are two things to try before you upgrade:
Barbara Hall, "Unknown Error (-208)" #1, 07:42pm Oct 19, 2005 CDT
http://docs.info.apple.com/article.html?artnum=302478

Lightroom, Photoshop, RAW Presharpening, Noise Reduction Workflow Help

I'm tying to determine a best practices route using Adobe Lightroom, Adobe Photoshop and Nik Software Sharpener and Dfine (Noise Management Software).
I shoot only RAW with a Canon EOS 30D with good quality lenses.
I import the RAW files from the CF card directly (DNG and save) into LR, add keywords, organize, etc.
However, I am now at the point where I need to determine a sensible workflow that includes these steps:
Import RAW into LR as DNG.
Edit, as needed, in PS.
Apply RAW Presharpening (as provided in Nik Sharpener).
Manage Noise (with Nik Dfine (2.0 available in next 24 hours).
Apply usage-based sharpening prior to printing or saving final file version.
Maintain organization in LR.
My original plan was:
1. Import RAW in LR.
2. Open in PS.
3. Apply noise reduction.
4. Apply RAW presharpening.
5. Save (with new version being an "Edit" copy back in LR.
6. Maintain organization in LR.
I'm wondering, though, if I wouldn't be better off doing the basics to the files prior to LR import. Note that the Nik tools work in 16-bit mode.
This is theoretically what I'm thinking, and would appreciate other user's input:
1. Save RAW files to location on Mac.
2. Apply Noise reduction to RAW files with Nik software within PS (perhaps automated, perhaps batched).
3. Apply RAW presharpening to RAW files with Nik software within PS (perhaps automated, perhaps batched).
4. Import noise- and presharpening-adjusted files into LR, with metadata additions, etc.
5. Open files in PS as needed, with files becoming edit versions within LR.
Any thoughts?

To summarize, then:
First time opening a RAW file from Lightroom, LR automatically creates a copy and appends "-Edit" to the filename. If it's a RAW file, only available option is the third option in the dialog box: "Edit a Copy with Lightroom Adjustments."
Once opened in Photoshop, any number of adjustments can be made and saved. All adjustments are reflected in the -Edit copy when previewed in back in LR.
If, later, I want to perform further PS edits on the -Edit version, I have 3 options as presented in the dialog box.
1. "Edit Original (LR adjustments will not be visible)"
2. "Edit a Copy (LR adjustments will not be visible)"
3. "Edit a Copy with Lightroom Adjustments"
Option 1 will open -Edit version #1 (but it will not show any changes made in LR to the -Edit file when opened in PS)
Option 2 will create a copy of -Edit version #1 and open that new file, -Edit-2 (but it will not contain any changes made in LR to the -Edit file)
Option 3 will create a copy of -Edit version #1 and open that new file, -Edit-2 and it will contain any changes made in LR to the -Edit file
So, a typical workflow would be:
1. Import RAW file in LR.
2. Make adjustments in LR.
3. If needed, open a copy (by default) in PS via LR (command-E).
4. Adjust in PS, save.
5. Adjusted file is stacked with original RAW file in LR.
6A. Assuming no additional edits in LR, further PS adjustments can be made to -Edit version original, keeping just 1 stacked version in LR.
6B. If additional adjustments are made to the saved -Edit version in LR, and further PS adjustments are needed, I must edit a copy of the -Edit file, ultimately resulting in a second stacked file.

PV2010 Color Noise Reduction Robs Dark Tones

No pun intended.
I thought at first it was the raw-conversion/de-mosaicing, but its turned out to be the color noise reduction.
Here is a the latest example of a picture that looks better in PV2003 than PV2010 no matter what I do, because of loss of clarity / contrast / dark-tones resulting from the new Color Noise Reduction algorithm. Note: This loss can not be restored using clarity or contrast sliders.
This probably ought to be a feature request: A slider that controls the coarser aspects of color noise reduction (color waves or clarity/contrast) versus the most localized aspects (color specs). In this instance, just getting rid of the specs without trying to reduce the waves might leave the dark tones(?) - Something like that. In any case, there is room to improve color noise reduction so that it leaves the dark tones / contrast / clarity in certain cases like this.
(Its a 100% crop of a section of a fish under water)
PV2003:
PV2010:
The difference is striking when viewing the whole photo from afar...
PS - I just discovered that minimizing noise reduction will maintain the dark tones better - I've therefore added down-throttling of color noise reduction to my PV2003 -> PV2010 practice.
Rob

dorin_nicolaescu wrote:
Luminosity Contrast slider also helps maintain some darker tones.
Indeed it do.
And, last but maybe (or maybe not) least, one can cheat a bit at the end and add some grain, to give the illusion of greater detail / texture. So, if you really want to preserve full detail when converting high ISO shots from PV2003 to PV2010, you need to:
1. Crank up the luminance noise reduction detail slider pretty darn high (if not all the way up).
2. Crank up the luminance noise reduction contrast slider pretty darn high (if not all the way up).
3. Minimize color noise reduction amount.
4. Crank up the color noise reduction detail slider fairly darn high (not all the way up! - color artefacts - bleh).
5. Maybe add a touch of grain (pretty darn low).
(I've left out the luminance NR amount slider and sharpening because they are the more obvious ones).
I'm guessing I'm not the first person to fall into the trap of trying to recover detail lost by noise reduction by decreasing luminance noise reduction amount and increasing sharpening detail (and maybe amount too), and winding up right back where you started - too much noise. The detail/contrast sliders of the noise reduction controls really work a lot better for that, and minimizing color noise reduction is also a hot tip for you detail junkies.
I hope I'm not the last person on this forum to realize what is now seeming sort of obvious to me, whilst everyone has a good laugh...
(I had previous just left color noise reduction and detail, plus luminance NR contrast at their defaults (I discovered the importance of the lum.NR detail slider long ago...) - but not anymore. It has helped me to articulate all this - hope it helps somebody else too..........
Rob

Background noise reduction

I would like to find a way to reduce the amount of background noise/hissing from my file.
I have been importing audio (music) from a cassette tape directly into Soundtrack. After making the necessary edits to the track I have been using the "Bitcrusher" effect to improve the "punchiness" of the sound. Then I have been exporting to iTunes as an .aiff file, followed by an import for iTunes and the file is transferred into my music file. Then I burned to a CD.
The sound is just okay and there is definitely a loud hissing noise as the volume is turned up. Does anyone have suggestions on how to:
a. Improve the overall quality of the sound?
b. Reduce the mount of background hissing/noise
The noise is not very apparent during playback on my computer just when I play it back on CD.
Thanks!

Bob,
Soundtrack Pro (STP) is currently at 1.0.3.
Where you have a section of your audio with no voice but background noise, did you use that as your noiseprint (STP, menu bar: process then set noiseprint) or as the section for Bias Soap to learn? After that, use the tool settings to listen to what either program is actually taking out (STP, menu bar: process then reduce noise, or Soap, and click noise only in either one). I typically reduce the amount of noise reduction to ensure I'm not affecting the voice (you don't want to hear the voice in noise only mode). Then I listen to it normally to ensure I haven't over done it on the noise reduction.

Has anyone use the 'NeatVideo' noise reduction plugin?

Today I spend most of my time looking for a noise reduction technique in FCP and came across a couple of plugins.
Noise reduction from Netvideo
De Noise from Re-vision effects
Most of the people pick the plugin from Neatvideo because even after redction that grain and noise it re-tains the video quality but having said that it is very hign on the CPU usuage.
So I was wondering if anyone has given the full version a try on FCP?
-A

Neat Video plug is great. Here's how I used it.
6 camera HDV 1080i 50, 100 min music shoot. Each Cam output was 2 x 50 min clips.
Half way through editing, I decided the HDV looked noisy because of a lot of low light footage, so tried the NV plug and got great results on a couple of clips. So I decided to process all the original Cam output and then substitute the files using FCPs reconnect process(just as I did with my photo-jpeg multi-clip footage) AND de-interlace at the same time.
Create Prores 422 sequence for each original cam clip in one FCP Project - 12 sequences.
Drag a HDV clip into each Sequence.
Drag the Nattress de-interlace plug onto each clip in each sequence and then the Neat Video Reduce Noise lug
Create the Device Noise Profile(which is actually the clip noise profile in my case) and add just a touch of sharpening in the Noise Filter Settings.
Select all the sequences in the browser and batch export them all as a quicktime movies.
Here's the sting in the tail - I then went on location for a month leaving the Mac Intel 8 core 3GHz on an uninterruptible power supply, to process it all.
When I returned it had taken 3 and a half weeks but looked very good. Luckily I'm away often!

Embed wav file in executable for playing

I would like to embed a wav file in an exectubale (an array of wav files would be best) so that I can play that sound.
I want to distribute one file (the executable) that can play an array of audio tracks from wav files.

You can either store the wav data in a constant like and array of clusters, each cluster would have the wave data (8 or 16 bit mono or stereo: which are 1-d or 2-d arrays of intergers) plus the config info rate resolution or you can store an array of references to wave file paths. I would go with the second version since you dont bind the data at compile time, allowing for the application to change "sound tracks" without recompiling. When you build the application you can specify these wave file as support files and lock their paths (probably ./application/data) you can even store the path in the registry if needed. Good luck.
Paul
Paul Falkenstein
Coleman Technologies Inc.
CLA, CPI, AIA-Vision
Labview 4.0- 2013, RT, Vision, FPGA

Noise reduction from wav file

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