Double-evoked otoacoustic emissions. I. Measurement theory and nonlinear coherence

Douglas H. Keefe

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


An evoked otoacoustic emission (OAE) measurement technique is proposed to better control for probe distortion. Each double-evoking (2E) stimulus sequence includes three, equal-duration subsequences defined as follows: s1(t) is a single chirp or click, s2(t)= εs1(t-τ) is a copy of s1 with relative amplitude ε and delay τ, and s12(t)=s1(t)+s2(t) is the superposition of the first two stimuli. The pressure response to each subsequence is p1, p2, and p12, respectively. The double chirp-evoked distortion product (2ChDP) and double click-evoked otoacoustic emission (2CEOAE) are defined by p(D) =p12-(p1 + p2). The 2ChDP response may be time compressed to analyze as an equivalent 2CEOAE response. The 2E response family provides a complementary representation between DP measurements and double click-evoked OAE measurements. A technique based on nonlinear coherence quantifies random noise in terms of a nonlinear signal-to-noise ratio.

Original languageEnglish (US)
Pages (from-to)3489-3498
Number of pages10
JournalJournal of the Acoustical Society of America
Issue number6
StatePublished - Jun 1998

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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