Whilst it is not necessary to learn the formula for calculating the standard deviation, there may be times when you wish to include it in a report or dissertation. Where x represents each value in the population, Î¼ is the mean value of the population, Ï is the summation (or total), and N is the number of values in the population.
In music, timbre, is the quality of a musical note or sound that distinguishes different types of sound production or musical instruments. The physical characteristics of sound that mediate the perception of timbre include spectrum and envelope. Timbre is also known in psychoacoustics as sound quality or sound color.
The sound of a musical instrument may be described with such words as bright, dark, warm, harsh, and other terms. There are also colors of noise, such as pink and white. In visual representations of sound, timbre corresponds to the shape of the image (Abbado 1988, 3).