COCHLEA is a new diagnostic OAE (Otoacoustic Emissions) test system developed, manufactured and tested by the Institute for Experimental Phonetics and Speech Pathology.
COCHLEA is realized in PC technology. The system operates under the Windows® operative system, supported by patient basis and contains the minimum of hardware components. COCHLEA is a system of modular type that increases the freedom of choice of application modules according to individual needs. In full configuration it contains modules: transiently caused OAE (TEOAE), ОАЕ as a distortion product (DPOAE) and TEOAE screening.


Potential applications

Screening of hearing
- Testing and monitoring of hearing
in newborns, preschoolers and schoolchildren.
- Detection of profession related early signs
of hearing loss (factory workers, musicians etc).


Researches
- Basilar membrane and cochlear functions.
- Outer auditory cells and efferent innervation.


Clinical evaluation
- Monitoring of ototoxicity effects.
- Differential diagnostics of cochlear and retrocochlear pathology.
- Identification and monitoring of middle ear pathology.
 

System characteristics

- TEOAE: change of stimuli amplitude from 60 to 90 dB SPL, choice of stimuli polarity, control of the noise rejection level, statistics of stimuli processing, TEOAE spectrum from 500 to 6000 Hz, indicator of OAE segment similarity.

- DPOAE: frequency range 500Hz - 8000Hz, amplitude range L1 and L2, simultaneous and independent change of intensity.

- Patient basis: records of patients, deleting of patients, measuring protocol, editing of previous measurements.

Technical characteristics


COCHLEA enables direct insight into:

- shape and spectrum of the stimuli,
- quality of the stimuli,
- actual flow of TEOAE and DPOAE measurement,
- spectrum of OAE signals and noise
- statistics of impulse processing.


Patient basis enables:

- records of patients
- deleting of patients
- editing of previous measurements


Probe:

- Microphone: frequency characteristic of 500 Hz to 6 kHz, sensitivity about –60 dB re 1.0V/0.1 Pa, (noise 25 dB SPL (A – characteristics, 1 kHz ref).
- Sound source: maximal output 90 dB SPL (protected).



Analogous ibnterface:

- 24-bit АD conversion,
- measurement frequency 48 kHz.


Kit:

- COCHLEA
- PROBE
- Earplug set
- Bag
- Charger