I am converting a number of vinyl discs to digital files. They are a series of radio broadcasts in Portuguese, recorded back in 1986-88.
I have a device which plays the discs and converts the sound to MP3, and then use Audacity to finalize the files. The records have lots of pops (even after cleaning), and I have been trying to supress them with Audacity. Obviously the audio quality drops and, after a few attempts, I would like to ask for your kind advice on how to improve it.
As an example, I have chosen the recording which I found to be the worst case so far. Two short files are attached to this message - one is the original and the other one has been cleaned up with Audacity.
I have used standard configurations for Audacity as follows:
First, I used click removal (threshold 200, max spike width 20). It has not been enough to suppress clicks satisfactorily, so I used then noise removal (noise reduction 24, sensitivity 0, frequency smoothing 150, attack/decay time 0.15). Finally, I amplified at 6.5 dB. Results are as attached.
I had tried to use the Pop Mute plugin, but the results were not as good as the attached file.
Could someone please send some advice on how to improve the audio quality of the attached file, keeping click removal?
If someone can please take a look, full MP3 files are available as follows:
Original recording: https://dl.dropboxusercontent.com/u/96724554/FILE_006.MP3
Cleaned up: https://dl.dropboxusercontent.com/u/96724554/Teste.mp3.
I use Windows 8 and Audacity 2.0.5. Sorry, I am not 100% sure, but I believe I have obtained the .exe installer.
Thank you very much in advance for all your support.
Valter - Brazil.