Sound Spectrum


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sound spectrum

[′sau̇nd ‚spek·trəm]
(acoustics)
A plot of the strength of a sound at various frequencies.

Spectrum, Sound

 

the set of simple harmonic waves into which a sound wave can be resolved. The spectrum expresses the frequency composition of the sound and is obtained by analyzing the sound. A sound spectrum is usually represented in a coordinate plane where the frequency f is plotted along the axis of abscissas and the amplitude A, or intensity, of a harmonic component with a given frequency is plotted along the axis of ordinates.

Figure 1. Spectrum of a musical sound

Pure tones, sounds with a periodic wave form, and sounds resulting from the superposition of several periodic waves have line spectra (Figure 1). Musical sounds, for example, have such spectra; a musical sound’s timbre depends on the sound’s spectrum.

Figure 2. Spectrum of a damped vibration

Acoustic noise, single pulses, and damped sounds have continuous spectra (Figure 2).

Figure 3. Sound spectrum of a keyboard instrument

Composite spectra are characteristic of the noise produced by some mechanisms. For example, the rotation of a motor may yield separate frequency components that are superposed on a continuous spectrum. Such spectra are also characteristic of keyboard musical instruments (Figure 3) that have, especially in the upper register, a noise coloration due to the impact of the hammers.

sound spectrum

A representation of the magnitude of the components of a complex sound as a function of frequency.
References in periodicals archive ?
Since RC takes into account not only the loudness of a sound spectrum but also looks at tonal imbalances, an RC with a neutral spectrum can be specified.
This is not necessarily an ideal situation because there is some loss of loudness compared to a situation in which one harmonic clearly dominates the sound spectrum, strongly indicating that a standing wave has been achieved in the vocal tract, which is highly efficient in maximizing the radiated sound.
With a total output of 520W via an eight-channel DSP-equipped amplifier, the seven-speaker system, with two subwoofer channels, employs advanced equalisation algorithms to recreate the sound spectrum that artists experience during studio recordings.
The published discharge sound power levels at the low end of the sound spectrum will increase, typically from 1 db to 8 db, which means the published NC levels also will increase by several points, especially in the medium and small boxes (1 to 4 point increases in the medium and up to 7 points in the small boxes are expected).
"The cochlea quickly gets the big picture of what's going on in the sound spectrum. The more I started to look at the ear, the more I realized it's like a super radio with 3,500 parallel channels," said Sarpeshkar.
And with his band Sound Spectrum, comprising several of his pupils, playing some of his self-penned numbers, his involvement in the local music scene continued.
Naturally from a bassist-led band there's a leaning towards to the deeper, sonorous end of the sound spectrum.
Creating educational and training programmes on mobile regulation to foster socio-economic development, expand financial inclusion through mobile money services and ensure sound spectrum management;
With a total output of 520W via an eight-channel DSP-equipped amplifier, the seven-speaker system with two subwoofer channels employs advanced equalisation algorithms to recreate the sound spectrum that artists experience during studio recordings, says the company.
A bright tone is achieved by tuning the resonance tract of the voice so that overtones of a higher frequency are enhanced, while, simultaneously, lower frequencies that are present in the sound spectrum at the glottal source are dampened or filtered out.
A similarly well-balanced sound spectrum underpinned an immensely satisfying account of Ravel's SecondDaphnis and Chloe Suite.
Usually it's group-based music from across the sound spectrum, which includes hip hop, reggae, funk, soul and rock.