The goal of this master thesis is to propose a practical methodology for audio ingestion, restoration and analysis, focusing on the reproduction, signal extraction and restoration of obsolete mechanical formats (discs of the pre-vinyl era) and reproduction artefacts, from the point of view of patrimonial institutions and sound archives. It also aims at evaluating some current tools available for the analysis and restoration of degraded audio signals. Reviewed knowledge has been applied to a specific patrimonial collection, allowing thorough documentation, mechanical restoration and preservation, signal extraction and digital processing for relevant recordings of the first half of the XX century.