Frequency Cutoff for the HiLo CE-Chirp®

Intermediate
10 mins
Reading
01 November 2017

Description

The HiLo CE-Chirp® is a stimulus which is used in automated ABR or ABRIS (auditory brainstem response infant screening).  Hearing screening programs typically recommend to screen hearing initially using a broadband stimulus such as a click or a CE-Chirp®. A problem with such stimuli is that although they are effective for eliciting an evoked response they are limited with respect to their frequency specificity. 

The HiLo CE-Chirp® provides clinicians with a more frequency specific stimulus which can be used in new born hearing screening. Its design is based on the CE-Chirp® which has a frequency range of 200 – 11,000 Hz. However the HiLo CE-Chirp® is actually two separate stimuli; a low frequency dominated stimulus and a high frequency dominated stimulus. 

The lower stimulus (Lo) covers the frequency range from 200 Hz - 1.5 kHz. Whereas the higher stimulus (Hi) covers the frequency range 1.5 kHz – 11,000 Hz.  In the software the screener will see two graphs which are generated for each ear. One for the Hi stimulus and one for the Lo. 

The above graph shows the display of the HiLo Stimulus in the Titan Suite. The Hi stimulus is shown in the column labelled high and the Lo stimulus is shown in the column labelled low. 

Typically when using the HiLo CE-Chirp® the Hi stimulus will pass quicker than the Lo because it less vulnerable to the effects of ambient noise.  

Presenter

Leigh Martin
Leigh Martin is a British Audiologist and adjunct lecturer at the University of Cork, Ireland. Clinically, he has worked in the National Health Service specializing in paediatric audiology as well as vestibular diagnostics and rehabilitation. Leigh has also sat on the board of directors for the British Academy of Audiology. Since 2013, Leigh has supported the growth and development of the Interacoustics Academy and holds the position of Director of the Academy. Leigh has presented at numerous scientific conferences and meetings across a diverse range of audiological topics as well as having published papers in both video head impulse testing (vHIT) and wideband tympanometry.

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