Smart Notes

System Calibration for ER3A and 10D

This document shows the procedure that can be used by field technicians to calibrate transducers to be used with IHS equipment. These calibration values are then applied by the software automatically when performing tests using these transducers for stimulation.

Using the Stimulus Conversion Utility

SmartEP, SmartEP-ASSR, SmartEP-CAM, Intelligent VRA, and Smart Audiometer have the ability to use custom created stimuli, such as speech. Before use, the stimuli must be converted from WAV format to the IHS proprietary stimulus file format. This Smart Note defines the requirements for the WAV files, the steps to convert the stimuli, calibrating the files before use, and some additional usage tips for individual programs.

TEOAE Suppression in SmartTrOAE

During otoacoustic emissions suppression, the stimulus is alternated between a masking white noise signal and a click signal; where the recordings are acquired in response to the click stimulus. By comparing a suppressed transient OAE recording to one that is acquired normally, conclusions can be drawn about the workings of the efferent nerve fibers and the suppression of sound. The suppression noise masking addon for SmartTrOAE is available for the… Read More »TEOAE Suppression in SmartTrOAE

Transient Evoked Otoacoustic Emissions with SmartTrOAE

The following Smart Note covers the basics for the acquisition of TEOAE responses, including Spontaneous OAE, using the SmartTrOAE software. Topics includes recommendations for probe usage, test settings, result analysis. SmartTrOAE is available for the Duet, USB, and USBLite hardware platforms.

Data analysis using SmartScreener-Plus 2

SmartScreener-Plus 2 includes some tools to obtain statistical analysis of the infant hearing screenings that were performed, including passing rates, noise levels and individual screener performance. This Smart Note covers the instructions on how to generate such report and understanding the information that is included in it.

Loopback self-test procedure for all hardware platforms

The Loopback self-test procedure can be used to evaluate the performance of all hardware platforms for systems that include the SmartEP program. By connecting the sound output of the unit to the signal input of the amplifier, it is possible to assess the proper operation of most of the components. Note that this test does not evaluate the transducers, electrode leads, and electrodes; as these will be disconnected during the… Read More »Loopback self-test procedure for all hardware platforms

Continuous Loop Averaging Deconvolution in SmartEP

Continuous Loop Averaging Deconvolution is a methodology allows the acquisition of auditory evoked responses at very high stimulation rates. CLAD algorithms use arbitrary stimulus sequences to acquire averaged responses that can later be deconvolved into recognizable evoked responses. The following Smart Note covers some suggestions for test settings for acquiring using CLAD techniques, when using the SmartEP software. CLAD can be used with the Duet and USB hardware platforms.