The jug does not touch the musician's mouth, but serves as a resonating chamber to amplify and enrich the sound made by the musician's lips.
22.
The ends of a slit drum are closed so that the shell becomes the resonating chamber for the sound vibrations created when the tongues are struck, usually with a mallet.
23.
Portable war drums ( " "'Lali ni Valou " "') had two or three resonating chambers and sent complicated signals over the battlefield.
24.
And a hole in the ceiling above the stage may have helped dissipate those harsh edges while also acting as a resonating chamber that amplified the mid-range and bass sounds.
25.
The body of a classical guitar is a resonating chamber that projects the vibrations of the body through a " sound hole ", allowing the acoustic guitar to be heard without amplification.
26.
The stovepipe ( usually a section of tin pipe, 3 " or 4 " in diameter ) is played in much the same manner, with the open-ended pipe being the resonating chamber.
27.
Unlike other types of vocal production, it is difficult to film the vocal cords while they are operating in this manner as the epiglottis closes down over the larynx and the resonating chamber assumes its smallest dimensions.
28.
The first seven-string electric guitars were built in the " hollowbody " or " semi-hollow " archtop styles, where the guitar has a central resonating chamber, or a central block with resonant chambers on the sides.
29.
A square wave can be thought of as an infinite sum of odd-numbered harmonics, which will include frequencies at the resonating chamber that amplifies the noise and presents a problem for sync-sound recording for film and video.
30.
The songs are created by standing very closely face to face and throwing deep rhythmic sounds from the diaphragm and vocal chords into each other's mouths and throats, which act as resonating chambers, " the program notes say.
