FIELD: analyze and recognition of speech. SUBSTANCE: device has speech signal receiver 1, amplifier 2, formant filter 3 and formant frequency estimating channel 4 which has signal level automatic regulating device 5 connected in series with differentiating unit 6, full-wave rectifier 7, lower frequency first filter 8, peak detector 9 and lower frequency second filter 10. EFFECT: improved precision of measurement of formant frequency. 1 dwg
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