The Speech in Noise (SIN) test was developed to help determine how much a given hearing aid or pair of hearing aids helps an individual understand speech in a background of noise, compared to listening unaided or with other hearing aids. The test consists of a series of female-talker recordings of the IEEE (modified Harvard) sentences as the target speech, and four-talker babble (three women and one man) as the noise source. Five sentences are recorded at each of four signal-to-noise (S/N) ratios: 15 dB, 10 dB, 5 dB and 0 dB S/N, all at the 0 dB VU meter calibration level, followed by a similar series recorded at a signal level 30 dB lower than the calibration level (-30 dB re 0 VU).
Therefore, there are 20 sentences at each level for a total of 40 sentences (or 4 IEEE lists), all of which constitutes a block. There are nine blocks of the SIN test, so that nine comparisons can be made without repeating sentences.
*The Speech in Noise includes a) audio recording, and b) instructions and score forms as printable pdf files on CD-Rom. The instructions provide information on administration. Available from Auditec, Inc. Call 1-800-669-9065 (from US) or 314-416-1050 (outside the US) to order.
Speech in Noise is Item No. CD102-9 and costs $50.00 USD + S&H FREE shipping within the contiguous US.
*The QuickSIN and BKB-SIN are considered more recent versions of this test. Although the more recent versions are preferred by most professionals, ghe SIN still proves to be useful to some audiologists.