izotope.com/learn
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iZotope Learn is the company's education hub offering tutorials, articles, webinars, and guides on audio restoration and production, including how-tos and tips on noise reduction, spectral repair, and restoration workflows using iZotope tools.
More resources on Audio Restoration
soundonsound.com
Sound On Sound is a long-running audio recording magazine and website. It publishes in-depth tutorials, gear reviews, and practical how-to articles on recording, mixing, mastering, microphone technique, DAWs, plugins, and studio setup.
Audacity Manual - Restoration
Official Audacity manual page for the Noise Reduction effect, explaining how to capture a noise profile from a silent section and tune reduction, sensitivity, and frequency smoothing. Readers will be able to remove steady hiss and hum from recordings without obvious artifacts.
mixonline.com
Mixonline.com is the online home of Mix Magazine, a professional audio trade publication. It features news, reviews, feature stories, and buying guides about mixing consoles, studio and live sound gear, and audio production technology.
Digital Audio Restoration
Graduate monograph on statistical signal processing for restoring degraded audio, covering click removal, hiss reduction, autoregressive modelling, and Bayesian and Markov chain Monte Carlo methods. Readers gain the mathematical basis for building and evaluating algorithms that repair damaged recordings.