It is quite common to have various sound artifacts present in your recordings from a variety of sources, with the effect of these artifacts on the sound quality of the recording ranging from mildly annoying to absolutely devastating. Here are some of the more common kinds of sound artifacts:
The industry-leading audio repair software, iZotope RX 9, can literally “fix” these and other problems. At the heart of this software application stands a real-time spectrum analyzer coupled with intelligent repair algorithms powered by machine learning. In my home studio, I have the budget-friendly iZotope RX Elements version of this incredibly powerful tool. This RX Elements version is a stripped down (lite) version of the more comprehensive RX 9 Standard and Advanced versions, and includes a stand-alone editor application with four essential repair modules :
The application also contains a number of audio waveform editing tools that include fade, gain, stereo and phase controls. There is a learning curve in figuring out how to use this audio repair editor -- I leave that task to the large number of tutorial videos available online. For my purpose here, I’d like to show an example of removing a couple of annoying “clicks” that are present in the audio file of my recording of Schumann’s Papillons, No. 8 piano piece. I believe these two clicks occurred at two points in time when sound events were edited with inadequate cross-fading between them -- so, I’d like to fix my errors using post-production audio repair with the iZotope RX De-Click module.
Shown below are the original sound file with the clicks and the repaired sound file with the clicks removed. You can see how these transient clicks are visually represented in the spectrogram as very broad frequency bandwidth energy impulses. These two clicks occur at about the 7 second and 17 second marks on the time axis. In the repaired file, notice the absence of these broadband impulses in the spectrogram ! Listen carefully to the two sound clips and see if you can notice the difference.
The iZotope RX Elements software came bundled (free) with other iZotope products that I was interested in using. At the time, I ignored the RX Elements application, thinking I would never really need to use it. But now that I have had time to play around with it, I can see just how powerful and useful these audio repair modules are !! So, it just goes to show that there is always something new to learn that will help you produce higher quality sound recordings in your home music studio.