Estimating CNC discrimination with spondee words
Daniel L. Bode, Raymond T. Carhart · The Journal of the Acoustical Society of America · 1975
Five experiments with normal listeners were performed to determine the percentage of CNC monosyllables correctly identified in various presentation paradigms at the speech reception threshold (SRT) for spondee materials. The purpose was to obtain information which would allow the quick estimation from the SRT of the stimulus level yielding these CNC percentages. Descending, simple-up-and-down, and best-of-three measuring techniques were used for SRT tests, and best-of-five, doublet, and constant-level tests were employed for measuring CNC discrimination. All tests involved monaural (earphone) listening conditions in quiet or against a background of either 60 or 80 dB SPL white noise. Findings revealed that the various SRT tests estimated percentage CNC discrimination scores ranging in about 17–29% on the rising portion of articulation functions. In general, present results indicated that SRT tests are most apt to measure approximately the 23% point on CNC functions for normal listeners. Subject Classification: 70.35.