Numbers of real and artificial impulse responses (IR) used in the listening test as a function of STI in steps of 0.05. Open and closed bars respectively represent frequencies of real and artificial impulse responses.
Relationship between word intelligibility scores and listening difficulty ratings.
score of listening difficulty rating as a function of each of the objective measures. A solid line and dashed lines in each panel respectively represent a linear regression line and 95% prediction intervals.
Chart for converting listening difficulty ratings to other measures: intelligibility rating, STI, , , and .
Categories of listening difficulty (see Ref. 1 ).
Correlation coefficients between the scores of listening difficulty ratings and each of the objective measures. The objective measures except STI were calculated using the impulse responses passed though octave bandpass filters for each center frequency, a two-octave bandpass filter that covers octave bands of and , and an A-weighted filter. The frequency weighting sum of and that of were obtained using the weighting factors for STI (see Ref. 13 ) and speech intelligibility index (Ref. 14 ). (SII).
Linear regression equations and correlation coefficients between scores of listening difficulty ratings and objective measures for octave bands of , , and , and for two-octave bands of and .
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