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A search for a good citation on the relative effects of SNR & overall level for perceiving speech in noise

I would be grateful for some references to work showing what we all know to be true -- that the primary determinant of performance for speech in noise for audiometrically normal listeners is the SNR, depending little or not at all on overall level (at least over a fairly wide range of moderate levels).

For those interested, this is a nice study on the extent to which speech perception is invariant across level for a wide range of levels:

Author(s): SIMON, C
Source: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA Volume: 64 Issue: 3 Pages: 744-750 Published: 1978

Yours - Stuart

P.S. I hope I am not opening a can of worms here!

P.P.S. I have done some searching but cannot find anything relevant.

Stuart Rosen, PhD
Professor of Speech and Hearing Science
Speech, Hearing and Phonetic Sciences
Division of Psychology & Language Sciences, UCL
2 Wakefield Street
London WC1N 1PF

Tel:   (+ 44 [0]20) 7679 4077
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Home page: http://www.phon.ucl.ac.uk/home/stuart