All musical instruments and voices share a source-filter acoustic structure

Evidence

In Chapter 4 we saw that all musical instruments, including the human voice, could be modeled as a sound source followed by sound modifiers, which apply a filtering function. In the limit the source may be regular spaced impulses, for pitched instruments, a single pulse for percussion instruments, random noise for fricatives, or a combination of them all. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2592

Categorization

• XREF: connects to: Every stringed instrument is analyzable as a sound source plus modifiers — David Howard, Jamie Angus, coustics and Psychoacoustics, 1092; Singing is humanity’s most versatile instrument and a real research field — David Howard, Jamie Angus, coustics and Psychoacoustics, 1332; Every acoustic instrument reduces to a source feeding a modifier that yields an output — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1056