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UDC 621. 395

STUDY OF THE IMPACT OF ACOUTIC NOISE ON PRIMARY CODEC SPEECH SIGNALS

V. T. Dmitriev, PhD (technical sciences), assistant professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
A. F. Yanak, graduate student, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

Impact of acoustic noise on the modern primary codecs of speech signals is studied. The aim is to investigate the influence of acoustic noise for the entire range of known primary codec speech signals. The experimental study of influence of various acoustic noise on all range of the known codecs of speech signals is conducted. The experiment is as follows: acoustic noise was superimposed on speech signal and mix enters the codec where it is coded and restored. The quality of the restored signal at the output of the primary codecs at the influence of acoustic noise is defined. The analysis of results is made and the experimental dependencies of quality of restored speech signal from signal to noise relation for various codecs of speech signals are constructed. Recommendations about use of low-speed, medium-rate and high-speed codecs of speech signals in the conditions of action of acoustic noise with various relation a signal-to-noise are offered. Thus, for narrow-band noise codec G 729a 8 kbit / s can be recommended, for broadband noise - G 728i 16 kbit / s and for pulse noise - G 726 24 kbit / s.

Key words: acoustic noise, primary encoding, speech signals, transmission of voice information, voice codecs.

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