Abstract
The object of research. Process of phonograms restoration and recovery are described.
 Investigated problem. Differences between some methods of quality control of phonograms during and after their restoration and recovery were investigated.
 The main scientific results. An instrumental method for objective assessment of the quality of phonograms is proposed, based on a non-intrusive model with parametric modeling of the phonogram signal to assess the effect of an artifact on a phonogram.
 The area of practical use of the research results. The results of the operational control of objective quality indicators of a real sound signal using virtual measuring instruments built into the software for working with sound are considered.
 An innovative technological product: a technology for assessing the quality of phonograms in the process of restoration and recovery (R&R), which makes it possible to objectively assess the quality of phonograms, taking into account artifacts of phonograms caused by the method of recording phonograms, the conditions of their storage, etc. enough high quality restored audio content.
 Scope of application of the innovative technological product: studio of restoration and recovery of sound phonograms on analog media, recording studios, technological processes of conversion and processing of sound programs, archives of radio and television recordings.
Highlights
The peculiarity of the quality control of phonograms when performing the recovery of phonograms (R&R Ph) is that, firstly, the sound engineer-restorer does not know the original quality indicators of sound and relies entirely on its own experience in evaluation the quality, and secondly, as a rule, there is no original sound of the sound fragment and does not with what to compare the quality; thirdly, the final result of the sound quality depends on the presence and “magnitude” of phonogram artifacts, as well as on the further use of the phonogram
By the waveform that is displayed in the main window of any program that works with sound, it is possible visually to determine the average level, signal peaks, the presence of clipping, pauses, useful signal, temporal parameters of phonogram fragments, signal dropouts, the presence of some phonogram artifacts [13]
The reliability of the measurement of operational parameters is shown in the screenshots
Summary
To control the quality of phonograms during the restoration process, subjective and objective methods are used, which can be carried out both in operational and non-operational modes. Problem description Subjective methods involve auditory control of the sound of phonograms using high-quality loudspeakers in a specialized, acoustically designed room – a control studio and, most importantly, are carried out with the assistance of experts. Such methods require sufficient funding and a lot of time to implement them, it is impossible without them. Objective control of the quality indicators of the phonogram is carried out. To carry out objective quality control in real conditions during the restoration and restoration of phonograms, hardware and software tools for measuring the parameters of phonograms
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