lecture14 - Pitch What is pitch? Pitch (as well as...

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Pitch What is pitch? Pitch (as well as loudness) is a subjective characteristic of sound Some listeners even assign pitch differently depending upon whether the sound was presented to the right or left ear Pitch characterize how high or low is sound Pitch is mainly (but not only) determent by the fundamental frequency Pitch is quantitative characteristic (it means we need a scale) The basic unit in most scales is octave
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Perception of pitch (Pitch discrimination) The jnd becomes smaller if the two tones are played simultaneously as the listener is then able to discern beat frequencies. The total number of perceptible pitch steps in the range of human hearing is about 1,400; the total number of notes in the equal-tempered scale is 120. Definition: The just-noticeable difference (jnd) or difference limen - threshold at which a difference between two sounds is perceived. ( Two sounds are judged the same if they differ by less than jnd.) The jnd is typically tested by playing two tones in quick succession with the listener asked if there was a difference in their pitches It depends on the training of the listener and the method of measurement It depends on the frequency, sound level, duration and the suddenness of the frequency change 125Hz - 62 of octave he within t 2 40 1 2000Hz - 1000 of octave he within t 36 . 0 3 . 4 1 Hz cents jnd Hz cents jnd Example: Definition: 1cent = 1% of a semitone
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Pitch of pure tone A. Pitch is changing with sound level (Stevens’ rule):
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This document was uploaded on 02/11/2012.

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lecture14 - Pitch What is pitch? Pitch (as well as...

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