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On the Threshold and Loudness of Repeated Bursts of Noise

1951; Acoustical Society of America; Volume: 23; Issue: 6 Linguagem: Inglês

10.1121/1.1906814

1520-9024

Irwin Pollack,

Sensor Technology and Measurement Systems

The loudness and threshold of an interrupted white noise (of constant sound-time fraction) was studied over a wide range of interruption frequencies. White noise has the useful property that, when interrupted, no spectral changes result in the white noise spectrum (in the frequency range passed by a dynamic earphone). Both at the threshold and at equal-loudness, less energy is needed for an interrupted noise than for a continuous noise. In many cases, an interrupted noise (sound-time fraction of 0.45) sounds louder than a continuous noise of the same burst amplitude (but of greater energy). There is a broad minimum, in the intensity required at equal loudness, for interruption rates between 2–10 per second. A conceptual formulation to encompass the results is presented.