Spectrum

The frequency content of a sound or audio signal often displayed as a graphic representation of amplitude against frequency. Three-dimensional displays of a spectrum add the time variation on the third axis. The spectrum of a sound is a primary determinant of its perceived timbre.

A partial spectrum consists of discrete frequencies known as overtones, harmonics or inharmonics. A continuous spectrum consists of noise components. The spectrum of a sound may be determined by a number of sound analysers or by Fourier analysis and is distributed over the audible range (20 to 20,000 Hz). A partial spectrum is also known as a line spectrum, where discrete frequencies are present. A continuous spectrum, on the other hand, shows frequencies continuously distributed over the audible range. (Source - Barry Truax - Handbook for Acoustic Ecology CD-ROM Edition. Cambridge Street Publishing, 1999 - CSR-CDR 9901)

Spectre

Contenu en fréquences d'un son ou d'un signal audio souvent présenté sous la forme d'une représentation graphique fréquence/amplitude. Les représentations du spectre en trois dimensions y ajoutent le temps sur un troisième axe. Le spectre d'un son est déterminant dans la perception de son timbre.

Un partiel est une fréquence discrète connue aussi sous les noms de overtone (en anglais), harmonique ou inharmonique. Un spectre continu se compose de bruit. Le spectre d'un son peut être décrit par différents types d'analyses ou par une analyse de Fourier et être distribué sur l'ensemble de l'espace sonore audible (de 20 à 20000 Hz). Le concept de partiel est aussi connu comme une ligne de spectre dans laquelle des fréquences discrètes sont présentes. A l'opposé, un spectre continu contient des fréquences distribuées d'une manière continue sur tout le spectre audible. (Source - Barry Truax - Handbook for Acoustic Ecology CD-ROM Edition. Cambridge Street Publishing, 1999 - CSR-CDR 9901)

Spettro

Contenuto in frequenza di un suono o di un segnale audio rappresentato graficamente nel dominio frequenza-ampiezza. Le rappresentazioni a tre dimensioni aggiungono anche la dimensione del tempo, nel terzo asse. Lo spettro di un suono, che si distribuisce nel range udibile (20-20.000 Hz), può essere descritto sotto forma di differenti tipi di analisi, tra le quali compare comunemente l'analisi Fourier.

Lo spettro è una dimensione determinante nella percezione del timbro di un suono. Le sue parziali sono frequenze discrete dette anche overtones in inglese, oppure armonici (armoniche) o inarmonici (parziali inarmoniche). Uno spettro continuo, invece, contiene frequenze distribuite in maniera continua su tutto lo spettro udibile, e corrisponde al rumore. Fonte - Barry Truax - Handbook for Acoustic Ecology CD-ROM Edition. Cambridge Street Publishing, 1999 - CSR-CDR 9901)

Spektrum

The frequency content of a sound or audio signal often displayed as a graphic representation of amplitude against frequency. Three-dimensional displays of a spectrum add the time variation on the third axis. The spectrum of a sound is a primary determinant of its perceived timbre.

A partial spectrum consists of discrete frequencies known as overtones, harmonics or inharmonics. A continuous spectrum consists of noise components. The spectrum of a sound may be determined by a number of sound analysers or by Fourier analysis and is distributed over the audible range (20 to 20,000 Hz). A partial spectrum is also known as a line spectrum, where discrete frequencies are present. A continuous spectrum, on the other hand, shows frequencies continuously distributed over the audible range. (Source - Barry Truax - Handbook for Acoustic Ecology CD-ROM Edition. Cambridge Street Publishing, 1999 - CSR-CDR 9901)

Espectro

Es el contenido de frecuencias de un sonido o una señal de audio usualmente mostrado mediante una representación gráfica de amplitud versus frecuencia. La representación tridimensional de un espectro suma la variación temporal sobre el tercer eje. El espectro de un sonido es un determinante primario del timbre que de aquel se percibe.

Un espectro de parciales consiste de frecuencias discretas conocidas como sobretonos, armónicos o inarmónicos. Un espectro continuo contiene componentes de ruido. El espectro de un sonido puede ser determinado mediante analizadores o por análisis de Fourier, y puede estar distribuido a lo largo del rango audible (20 a 20.000 Hz). Un espectro de parciales, donde hay frecuencias discretas, es también conocido como un espectro de líneas. Un espectro continuo, por otro lado, muestra frecuencias distribuidas en forma continua sobre el rango audible.

(Fuente: Barry Truax (1999). Handbook for Acoustic Ecology. CD-ROM. Cambridge Street Publishing. CSR-CDR 9901)

References