LING 2P91 Lecture Notes - Lecture 4: Pressure Measurement, Logarithm, Sound Pressure
15 Jan 2016
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(reference, so it would be your zero) 20upa or . 0002 dyne/cm2 or . 0002. Linear vs. logarithmic scale figure 1. 19, p. 36. Linear scale (one to one relationship)= 0, 1, 2, 3, . Closely approximates how the human ear judges changes in loudness. Allows huge ranges of intensities to be condensed into approximately 140 units. Ratio scale so it allows us to compare measurements. Allows us to compare a sound to a standard reference. Standard reference of amplitude ubar ---- sound pressure level (db spl) Refers to the softest sound of a particular frequency that the ear can hear 50% of the time. Law 1 of exponents: if trying to determine the product of 2 values with the same base, raise the base to the sum of the 2 powers (22 x 26 = 28) Law 2 of exponents: ratio of a base raised to different powers is equal to the base raised to the difference between the 2 powers (22)3=26.
