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Frequency compression and its effects in speech recognition
Letícia Pimenta Costa Spyer Prates1, Francisco José Fraga da Silva, Maria Cecília Martinelli Iório
1do Hospital das Clínicas - Universidade Federal Minas Gerais. lepcosta@hotmail.com
Background:
frequency compression.
Aim:
to evaluate the index of speech recognition (IPRF) using frequency compression in three different ratios.
Methods:
monosyllabic words were recorded using an algorithm of frequency compression in three ratios: 1:1, 2:1, 3:1, generating three lists of words. Eighteen listeners accomplished the IPRF using the modified words. They were subdivided in two groups, considering familiarity with the speech material: group of audiologists (F) and group of patients (P).
Results:
a statistically significant decrease in accuracy was observed when using frequency compression. Group F presented a better performance than Group P in all of the applied ratio frequency compression ratios.
Conclusion:
Frequency compression hinders speech recognition; as the compression ratio increases, so does the level of difficulty. Familiarity with the words facilitates recognition in any hearing condition.
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