Perceived pitch of vibrato tones Free

A new measurement of the perceived pitch of tones with vibrato has been made using the method of adjustment with five subjects. Adjustments were made for the following conditions with sine wave signals: 440.0 Hz unmodulated, 220.0 Hz with a range of ±6.4 Hz, 440.0±6.4 Hz, 440.0±12.9 Hz, 440.0±26.2 Hz, and 880.0±25.8 Hz with a modulation rate of 6 Hz. In addition, a square wave signal of 440.0±12.9 Hz was used. The averages of the settings minus the central frequencies and the standard deviations of the distributions obtained are −1.9±4.4 ¢, −0.3±8.0 ¢, −1.4±5.8 ¢, −2.9±8.0 ¢, −6.4±14.2 ¢, −0.5±11.7 ¢, and −5.1±10.6 ¢, for the condition in the same order as given above. If the differences for the unmodulated signal are treated as constant errors, then the following corrected average values are obtained for the 440‐Hz sine waves: 0.5±4.9 ¢, −1.1±7.0 ¢, and −4.6±13.4 ¢, respectively. These corrected values are compatible with the geometric means and not the arithmetic means in the latter two cases. In addition, two subjects were tested at modulation rates of 4 and 8 Hz for the 440.0±12.9 Hz case with no statistically significant variations from the case of the 6‐Hz rate.