A Method for the Real-Time Updating of Voice Samples in the Unified Biometric System
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ACOUSTIC MEASUREMENTS A METHOD FOR THE REAL-TIME UPDATING OF VOICE SAMPLES IN THE UNIFIED BIOMETRIC SYSTEM V. V. Savchenko1 and A. V. Savchenko2
UDC 534.6; 53.082.4
The article continues our previous work [V. V. Savchenko and A. V. Savchenko, Izmeritel’naya Tekhnika, No. 12, 46–52 (2019)]. We study the problem of automatic control of the quality of voice samples recorded and stored in the Unified Biometric System. We propose a solution of the problem of timely updates of the collected samples required because their consumer qualities are lost in the course of time. A new indicator of the acoustic quality of voice samples in the Kullback–Leibler information metric is investigated and a new procedure is proposed for measuring this indicator at the times of contact of the users with the system with service requests. An example of practical implementation of the proposed method in the real-time mode is demonstrated. By using software specially developed by the authors, we performed a full-scale experiment and obtained quantitative estimates of the period of updating of voice samples. Some recommendations concerning their practical application are given. The accumulated results can be used for the purposes of development of new systems and technologies (and upgrading of the existing systems) of automatic quality control and adaptive renewal of the biometric personal data samples. Keywords: speech acoustics, acoustic measurements, speech signal, biometric, unified biometric system, voice sample, voice identification, voice verification.
Introduction. The Unified Biometric System (UBS) is a national digital platform (https://bio.rt.ru) created in 2018 on the initiative of the Bank of Russia and the Ministry of Digital Development, Communications, and Mass Media (MDDCMM) of the Russian Federation for the purposes of distant identification of citizens. The Rostelekom Company was appointed to be the operator of the UBS. A powerful impetus to the creation and implementation of the UBS was given by the national program “Digital Economy of the Russian Federation” approved by the Russian government (https:// digital.gov.ru/ru/activity/directions/858/). According to the claimed purposes of this program and the existing worldwide trends, the UBS must penetrate, in the future, into almost all spheres of the national economy: from health protection and education to the systems of online state services [1–3]. However, in the first stage, the priority is given to the sphere of banking because the application of UBS may significantly increase the possibility of getting remote bank services, including telephone requests, and, hence, sharply increase the bank traffic [4]. Specially for the banks, the Rostelekom Company created a mobile application called Biometry. As a result, since July 2018, every Russian citizen can include his/her biometric data in the UBS (with the help of all large banks) in the bimodal form: a face photo and a voice record. At the present, about 200 Russian banks participate in collecting the biometric personal
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