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    Preliminary evaluation of a formant enhancement algorithm on the perception of speech in noise for normally hearing listeners

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    Author
    Alcantara, Joseph I.; Dooley, Gary J.; Blamey, Peter J.; Seligman, Peter M.
    Date
    1994
    Source Title
    Audiology
    University of Melbourne Author/s
    Blamey, Peter; Seligman, Peter
    Metadata
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    Document Type
    Journal Article
    Citations
    Alcantara, J. I., Dooley, G. J., Blamey, P. J., & Seligman, P. M. (1994). Preliminary evaluation of a formant enhancement algorithm on the perception of speech in noise for normally hearing listeners. Audiology, 33, 15-27.
    Access Status
    This item is currently not available from this repository
    URI
    http://hdl.handle.net/11343/27394
    Description

    Copyright confirmation in progress. Any queries to umer-enquiries@unimelb.edu.au

    Abstract
    The effects on speech perception in noise of dynamic filtering with bandpass filters centred at the first formant (f1) and second formant (f2) frequencies were evaluated with four normally hearing listeners. Multitalker babble was added to the speech signal with signal-to-noise ratios of-5 to -15 dB, chosen to reduce intelligibility to about 50%. The combined signal was then filtered with two-pole programmable bandpass filters centred at fl and f2 under the control of a real-time speech processor. The f1 and f2 frequencies were estimated from the speech signal before noise was added to avoid hardware processing errors. Closed set vowel and consonant tests (using 11/h/vowel/d/ and 12 /a/consonant/a/ stimuli), the Consonant-Nucleus-Consonant Monosyllabic Word Test and the Bamford-Kowal-Bench Sentence Test were carried out for three filter bandwidths (3/4, 1/3 and 1/6 octave) and for unprocessed speech in noise. The processing produced a small significant improvement for vowels in all three processed speech conditions and for monosyllables at the broadest filter setting compared to the unprocessed speech condition. There was no significant effect on consonants. A small negative effect was observed for sentences at the narrowest filter setting.
    Keywords
    speech perception; formant enhancement; background noise

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