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Low cost electric network signal and frequency recorder

This paper presents a low cost solution for a framework used for recording the electric network signal and for logging the fundamental frequency variations. The resulted database is used for time stamping audio recordings based on the Pearson correlation coefficient. Furthermore, we propose a fast algorithm for computing the Pearson correlation coefficient by emplying filters to implement efficiently mathematical operations involved in the process. The overall cost of the proposed framework is reduced ten times than its previous version.

Author(s):

Valentin A. NITA    
University Politehnica of Bucharest
Romania

Amelia CIOBANU    
University Politehnica of Bucharest
Romania

Cristian NEGRESCU    
University Politehnica of Bucharest
Romania

Dumitru STANOMIR    
University Politehnica of Bucharest
Romania