A sound spectrum is the representation of a sound regarding the amount of vibration that happens at each individual frequency. The spectrum expresses the frequency composition of the sound and is obtained by analyzing the sound. The sound spectrum is shown as a graph of power or pressure as a function of frequency. This power or pressure is measured in decibels, while the frequency is measured Hertz.
The sound spectrum can be measured with different tools, such as an analog-digital converter, a microphone or a computer. Most sounds are created by mixing up complex vibrations, and the sound spectrum shows the different frequencies that are contained within a sound. The audio spectrum is the audible frequency range at which human beings can hear. Each frequency band has a different impact on the total sound.
The sound spectrum is a set of simple harmonic waves into which a sound wave can be fixed. A musical sound’s timbre depends on the sound spectrum. It’s worth mentioning that a better frequency response does not always translate into better sound quality.
Sounds are created when something vibrates. When this vibration occurs, the vibrations travel through the air as sound waves and the human ear receives these vibrations, producing vibration of the eardrums. Since sound is absent in outer space, it needs a medium to travel. When sound is absent, nothing can carry the sound’s vibrations.
There are three types of sounds: inaudible sounds, which aren’t perceivable by the human ear, ultrasonic sounds, which are higher in frequency than audible sounds, and infrasonic sounds, which are low-frequency sounds.
The frequency response defines the range of musical tones that a component can reproduce. The frequency response measures if and how well a specific audio element reproduces the audible frequencies while altering the sound signal. In an ideal world, every component in the signal chain should have a flat frequency response, but this is not always the case. All things said, frequency response has a great impact on how the output sounds.