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• ### Amplitude

(Acoustic) The size of a wave vibrating at a given frequency. Related to intensity measured in db (decibels)

### Beat (tone)

(Auditory) Perceived periodic variation in loudness, resulting from accoustical interference of two near-unison tones

### Cents

(Aucoustic) Unit of pitch distance (or interval) corresponding to 1/100m of a semitone

### Decibel/Bel

(Aucoustic) One tenth of a Bel, or the ratio in sound intensity of about 1:26:1

### Diatonic

(Aucoustic) The unordered collection of tones found in the major scale; specifically, a sevenfold pitch set whos members constitute the interval class set

### Frequency (and hertz)

(Aucoustic) The rate at which a vibration completes a full cycle. Hz is a single cycle per second

### Fundamental

The lowest frequency partial of a complex tone

### Harmonic

(Aucoustic) Any relationship described by superparticular integers such as 1"2"3"4..., Any parial of a complex tone whos frequency is an integral multiple of the frequency of the fundamental of that tone

### Intensity

The physical attribute of sound energy. The most common measure of sound intensity os sound intensity level (SIL), measured in increments of decibels.

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### JND (Just Noticeable Difference)

(Auditory) The smallest amound of change in a stimulus that can be detected above chance

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### Loudness

(Auditory) Subjective psychological correlate of amplitude of sound intensity perceived

### Meter

Recurring pattern of strong and weak typically in combinations of twos and threes

### Octave

(Aucoustic) The interval between two tones with the fundamental frequency ration of 1:2 or thereabouts; a listener may tolerate and even prefer an inexact one-to-two correspondence. The octave percept carries with it the strong impression that the two tones share the same pitch, although they are clearly seperated in pitch height

### Overtone

(Aucoustic) Any partial of a complex tone that has a frequency greater than that of the fundamental. The term has been largely abandoned in favor of partial or upper partial

### (Tone) Partial

(Aucoustic) Any component of a complex tone, including the fundamental. A tone partial may or may not be periodic; its duration may be equal to that of the complex tone, or it may have an exceedingly short duration

### Pitch (and pitch class)

(Auditory) Mental sensation of a tone class

### Rhythm

The pattern of durations in music. In western music these patterns relate to...

### Scale

(Aucoustic) In music a pitch set ordered so as to be as nearly stepwise as its component pitches will allow

### Semitone

(Aucoustic) synonymous with half-step. The smallest pitch increment in the twelve-tone equal tempered set. The terms semitone and half-step may stand for either a change in pitch name (ex E-F) or a chromatic alteration with pitch name retained (ex F-F#)

### Spectrum/complexity

(Aucoustic) Specific shape or contour of a single cycle or a periodic sound function as represented by a two-dimensional graph (wave forms other than sine waves are considered complex)

### Timbre

(Auditory) "tone color/quality" terms that denote properties of sound (besides pitch and loudness) which combine to produce an overall auditory identity of character. (recognizing a specific persons voice over the phone)

### Tone Chroma

(Auditory) Perceptual similarity of tones an octave apart; the perceptual manifestation of pitch class

Example: