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Audio has a frequency range between 20Hz and about 20kHz.However, the effect of loud subaudio can be felt as a sort of low rumble. Subaudio or infrasound has a frequency range between 0Hz (silence) and about 20Hz.The spectrum table lists the frequency bands and ranges in the sound spectrum. It is the small peak at the right of the spectrogram. You may just be able to hear it with good ears and speakers. This is heading towards ultrasound territory. The fourth sound is a 12kHz sine wave.The crinkly line running along the bottom of the spectrogram shows the spectrum of white noise. It contains a wide range of frequencies, most of which are audio but it includes subaudio and ultrasound as well. It is the prominent peak in the middle of the spectrogram. The sound can be heard and has a single well-defined pitch in the mid frequency range. The second sound is a 440Hz sine wave.It is the large peak on the left of the spectrogram. You will need very good ears and speakers to hear it, to most, it will be inaudible. This is subaudio sound and it is on the threshold of hearing. The spectrum figure shows a composite spectrogram of all four sounds: Spectrum plays four different sounds in succession. SpectrumĪudio: spectrum (0:08) Figure: spectrum Band You cannot sing like a waterfall, it is unpitched sound. For example, you may, with some effort, sing like a bird. If you can sing it, it is pitched sound, if you cannot, it is unpitched. Sound is broken down in the guide into two broad groups: pitched sound, commonly called a note, and unpitched sound.Ī quick way to determine whether a sound is pitched or unpitched is to try to sing it. A spectrogram provides a visual representation of the spectrum. Sound occupies a range of frequencies called the sound spectrum. The subtle difference between the two is that pitch is a subjective perception of the frequency of a sound whereas frequency is an objective physical property of a sound. Pitch and frequency are used interchangeably throughout the guide. Pitch is the perceived frequency of a sound.