Pitch Shifts of Tones in Wide-Band Noise

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Abstract
Pitch shifts of pure tones occurring in wide-band noise were measured for 5 frequencies (250, 500, 1000, 3000, and 6000 Hz) at 4 levels (5, 15, 25, and 35 dB) above quiet and masked thresholds for reach of 11 subjects Amount of noise employed was sufficient to shift threshold of a 1000-Hz tone by 35 dB. Alternate monaural presentation of 500-msec standard and variable signals was employed. The amount of pitch shift expressed in Hertz was found to increase with frequency. Relative pitch shift (absolute shift/standard frequency) increased with frequency between 250 and 3000 Hz but was less for 6000 than for 3000 Hz. Apparently the relative amount of pitch shift may decrease with signal level for frequencies less than 3000 Hz, increase with signal level for 6000 Hz, and be independent of signal level for 3000 Hz. All observed pitch shifts were in an upward direction, except for the 2 lowest frequencies.

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