[A vocal processor for cochlear prosthesis]. / Rechevoi protsessor dlia kokhlearnogo proteza.

The authors review problems of the design of an experimental sample of a laboratory vocal processor for cochlear implantation. Provide a brief description of the work modes and potentialities of the device. Present the tentative data on electric stimulation of the cochlea. Conclude that the device can be used both in research and practical work in the area of cochlear implantation.

[Cochlear prosthesis:approaches and results]. / Kokhlearnyi protez:podkhody i rezul'taty.

This paper describes the development of a prototype of a verbal processor for electric cochlear stimulation. This is a four-channel verbal processor that allows electric stimulation of the hearing organ with acoustic signals, e.g., verbal speech. Preliminary results of psychophysical investigations into the perception of electric signals by deaf patients are presented. It is concluded that devices of this type can be used for research purposes and cochlear implantation.

["Slukh-3"--an expert system for the individual selection of hearing aids]. / "Slukh-3"--ékspertnaia sistema dlia individual'nogo podbora slukhovykh apparatov.

Herein is described the algorithm of an expert system intended for the individual choice of hearing aids, based on SM-4 computer. The audiometric data and hearing aids bank information allow to select for each patient the most preferable unit, regarded as suitable from the view of speech distinction. Moreover, with the help of this system it is possible to identify the most preferable way for manufacturing the audition prosthetic appliance (mono-or binaural) and to get recommendations for manufacturing prosthetic appliances for each ear individually; and for mono-aural prosthetic manufacturing--to identify the best version of the prosthesis for each ear individually. This system is most effective for the manufacture of audition prosthetic appliances for people with defective hearing.

[Evaluation of binaural interaction by the characteristics of short-latency auditory evoked potentials in guinea pigs]. / Otsenka binaural'nogo vzaimodeistviia po kharakteristikam korotkolatentnykh slukhovykh vyzvannykh potentsialov u morskikh svinok.

Binaural interaction was evaluated by determination of the curve of difference between the algebraic sum of brainstem evoked potentials which had been registered under monaural stimulation of right and left ear and potentials which had been registered under binaural stimulation. The curve of difference is characterized by three peaks: N1, P1, N2 with peak latency IV-IV' without any masking noise, and during masking with the signal-to-noise ratio of +20-0 dB additional peaks N0P0 are registered in III-III' latency regions on the difference curve. With an increase of the sound pressure level from 47 to 107 dB the P1N2 amplitude grows and relation of the P1N2 amplitude to wave amplitude IV of the sum of potentials registered during monaural right and left ear stimulation remains constant. Under masking conditions the above relation increases with worsening of the signal-to-noise ratio and the P1N2 amplitude decreases. Binaural interaction pattern is not supposed to alter with an increase in the click intensity level, and during masking with the signal-to-noise ratio of +20-0 dB specific features of neurophysiological mechanisms of binaural interaction are observed.

[Automated system for individual selection of hearing aids]. / Avtomatizirovannaia sistema individual'nogo podbora slukhovykh apparatov.

The automated system based on the computer CM-4 and the algorithm for selecting hearing aids are described. From the audiometry data (a hearing threshold, discomfort, etc.) the acoustic characteristics of hearing aids are calculated allowing a low hearing person to improve the speech perception. Then, according to the developed fitting criteria the system selects the required hearing aid from the available set (acoustic characteristics are preliminary loaded into the computer memory). Consequently, an audiologist has the important information on the most adequate hearing aid for a patient along with the data on the unit operating modes and the validate compliance between the rated and computed values. The high efficiency of the system has been demonstrated while selecting hearing aids for low hearing persons in clinical practice, the selection time being considerably reduced.