Accidental Wow Defect Evaluation Using Sinusoidal Analysis Enhanced by Artificial Neural Networks

A method for evaluation of parasitic frequency modulation (wow) in archival audio is presented in this paper, published in the PrestoSPACE project. The proposed approach utilizes sinusoidal components as their variations are highly correlated with the distortion variations. The sinusoidal components are extracted from audio signal by means of sinusoidal modeling procedures being often severely distorted and in case of …

Chasing Technology The Challenge of Preserving Audiovisual Records

Archivists who work with audiovisual records often find themselves confronting a challenge their counterparts who deal with traditional paper records do not have. They must often act as “bucket brigades”—chasing one “fire” after another as rapidly changing technology threatens to render the media formats storing audiovisual records obsolete and inaccessible. What these archivists face is the daunting task of preserving—and …

Evaluation of the maximal modulation frequency for wow and flutter detection

Author of this paper participated in the development of several algorithms for wow and flutter characteristic determination. The algorithms were found useful in some real-life restoration procedures, however, there was no study of their capabilities in terms of the maximal determined modulation frequency. This paper presents such a study for three algorithms, i.e. the power-line hum tracker, high frequency bias …

Determining techniques for “wow”distortion

Algorithms for determining the wow distortion characteristic are proposed. These are the power-line-hum tracking algorithm, the high-frequency-bias tracking algorithm, and the algorithm based on an adaptive analysis of the center of gravity of the spectrum of the distorted signal. All of the algorithms presented allow a hardware- or software-based implementation.

MTS Pilot tracking algorithm for “wow”distortion

New algorithm for detection of the wow distortion characteristic basing on the MTS pilot tracking is introduced. By observing a variation of the pilot frequency, the depth of the parasitic modulation can be estimated. MTS is an audio coding system used in an NTSC television standard, thus the algorithm is applicable only in that type of recordings. It is based …

Sounds familiar?

Contents: Sounds familiar? homepage Regional Voices Changing Voices Your Voices Case Studies Activities Deze thema website geeft bezoekers de gelegenheid om te luisteren naar een selectie van 71 opnames en meer dan 600 korte audio clips uit 2 collecties van het gesproken woord archief van de British Library. Door deze opnames uit het ‘Survey of English Dialects’ of uit de …