Nt1310 Unit 6 Lab Report

Words: 425
Pages: 2

Present list pairs from the standard CD through a loudspeaker in the sound field around 45dB. It is a speech-in-noise test that uses sentences recorded in four-talker babble. This test helps estimates SNR loss in children and adults. SNR loss is the increased signal-to-noise ratio required by a listener to understand speech in noise compared to normal speech. The BKB-SIN contains 18 list pairs that differ by difficulty, and each list pair has two lists. Both lists of the pair must be administered, and the scores are averaged for validity. Once the results are found, they are then compared to normative data to obtain the SNR loss. List pairs 1-8 have ten sentences in each list, with one sentence at each SNR of +21, +18, +15, +12, +9, +6, +3, 0, -3, and -6 dB. List pairs 9-18 have eight sentences in each list, with one sentence at each SNR of: +21, +18, +15, +12, +9, +6, +3, and 0 dB.

Scoring
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These key words are underlined in the score sheets. Each key word repeated correctly is one point. Subtract the total correct from each list from 23.5 to get the SNR-50; this is the signal-to-noise ratio for 50% correct. The next step is to average the SNR-50 scores for both lists of the list pair, then average the list pair scores. Finally, compare the list pair score to the age-related norm to determine the SNR loss.