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What is Tone Burst Ramping?

James W. Hall III, PhD

September 9, 2013

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Question

 Can you please explain tone burst (TB) ramping?

Answer

Imagine a singe stimulus with an onset, an offset, and maybe a plateau or period between the onset and offset. The ramping is the shape of the stimulus from the onset to the beginning of the plateau, or how intensity is increased from no stimulation to the maximum amplitude for a single stimulus. 

Linear ramping is a straight line amplitude increase. Research many years ago showed that linear ramping of stimulus onset produced unwanted energy at frequencies above and below the test frequency. Experimentation showed that it was possible to alter the frequency specificity of stimulation by modifying the shape of the ramp. This is now done with different mathematical formulae that vary the shape. Some time ago an electrical engineer named Blackman developed an equation for a stimulus onset ramp or envelope that minimized "spectral splatter" of abrupt sound stimulation. The ramp begins to increase slowly and the more rapidly increases as the maximum is approached.

My New Handbook of Auditory Evoked Responses (Hall, 2007) book includes a more detailed explanation of this concept.

For an in-depth discussion of this topic, please view Dr. Hall’s recorded course on AudiologyOnline, Application of ABR in Objective Assessment of Infant Hearing

Reference

Hall, J.W. (2007).  New handbook of auditory evoked responses.  TX: Pearson.


james w hall iii

James W. Hall III, PhD

James W. Hall III, PhD is an internationally recognized audiologist with 40-years of clinical, teaching, research, and administrative experience. He received his Ph.D. in audiology from Baylor College of Medicine under the direction of James Jerger.  During his career, Dr. Hall has held clinical and academic audiology positions at major medical centers. Dr. Hall now holds appointments as Professor at Salus University and the University of Hawaii, and as Extraordinary Professor at the University of Pretoria South Africa. Dr. Hall is the author of over 160 peer-reviewed journal articles, monographs, or book chapters, and nine textbooks including the 2014 Introduction to Audiology Today and the 2015 eHandbook of Auditory Evoked Responses.

 


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