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.
Listeners can make the distinctions in timbre because each note from a musical instrument or voice is a complex wave with unique multiple frequencies. 1  The characteristics that describe types of timbre are descriptive in nature and include: 2  Reedy. 3  Warm. 4  Breathy. 5  Dark or bright. 6  Heavy or light. 7  Flat. 8  Having, or lacking, vibrato.