I need noise filtering audio recording program

I want to recover some old audio (speech) which was recorded about 40 years ago on a defective reel to reel recorder. The recording has a background AC hum and also other noise, a constant squeal, that I want to filter out. Does onyone know of a program that will allow me to create a phase reversal type of filter to clean up the recording? Most of the ones that I have looked at appear to only filter out pops, clicks and hisses (from old records). I am running Win2K and have all the hardware needed (I think).

 

Thanks

Thanks for the lead. Didn't know exactly where to start looking for this particular problem. I'll check it out.

 

I have used GoldWave for such operations. Use Audiograbber to copy that speech to disk. Then open this file in GoldWave, select and copy a small section with noise only (no speech or music) to Clipboard and use this sample as a filter (under Effects>Filter>Noise Reduction).

 

Personally I use CoolEdit Pro v2.1 for everything I do thats audio, Im learning how to use Cakewalk at the moment for more musical stuff

How long is the audio? If you wanted you could send it to me any I would be happy try try and help you out with it

I've heard that Steinburg CLEAN! is quite good too.

 

You may want to invest in Wavelab -lots of plugins that will allow you to mess with phase problems.
Give it a try -I'm sure that one of the plugins is exactly what you 're looking for.
-522.

 

Thanks again to all of your responses. I am investigating each of your suggestions. The speech recording that I want to clean up is about 30 minutes of one of my deceased grandmothers. It is the only known recording of her voice and I want to preserve and share it.

 

Try WaveSurfer. It's powerful, versitile, expandable and programable. It's also freeware for non-commercial use!

Development language and support forum availible.


http://www.speech.kth.se/wavesurfer/download.html



WaveSurfer is an Open Source tool for sound visualization and manipulation. It has been designed to suit both novice and advanced users. WaveSurfer has a simple and logical user interface that provides functionality in an intuitive way and which can be adapted to different tasks. It can be used as a stand-alone tool for a wide range of tasks in speech research and education. Typical applications are speech/sound analysis and sound annotation/transcription. WaveSurfer can also serve as a platform for more advanced/specialized applications. This is accomplished either through extending the WaveSurfer application with new custom plug-ins or by embedding WaveSurfer visualization components in other applications.

Highlights:

Multi-platform - Linux, Windows 95/98/NT/2K/XP, Macintosh, Sun Solaris, HP-UX, FreeBSD, and SGI IRIX
Flexible interface - handles multiple sounds
Common sound file formats - reads, and writes WAV, AU, AIFF, MP3, CSL, SD, Ogg/Vorbis, and NIST/Sphere
Transcription file formats - reads, and writes HTK (and MLF), TIMIT, ESPS/Waves+, and Phondat. Support for encodings and Unicode.
Unlimited file size - playback and recording directly from/to disk
Sound analysis - e.g. spectrogram and pitch analysis
Customizable - users can create their own configurations. Localization support.

Extensible - new functionality can be added through a plugin architecture

Embeddable - WaveSurfer can be used as a widget in custom applications

Scriptable - hosts a built-in script interpreter

WaveSurfer is being developed at the Centre for Speech Technology (CTT) at KTH in Stockholm, Sweden, and is provided as open source, under a BSD style license.

As Goldy said, CoolEdit Pro is also a good prog.