Open Pipe Resonance Sound Quality Open Pipe Resonance

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Open Pipe Resonance & Sound Quality

Open Pipe Resonance & Sound Quality

Open Pipe Resonance • An open pipe resonator is a resonating tube with both

Open Pipe Resonance • An open pipe resonator is a resonating tube with both ends open • The open ends have antinodes • To avoid confusion, the book has nodes and antinodes reverse. Please go off the notes for reference

Open Pipe Resonance • The minimum length of a resonating open pipe is one

Open Pipe Resonance • The minimum length of a resonating open pipe is one half the wavelength of the resonance frequency • Comparing open and closed pipes of the same length, the wavelength of the resonant sound for the open pipe will be half of that for the closed pipe

Open Pipe Resonance • The frequency of an open pipe will be twice as

Open Pipe Resonance • The frequency of an open pipe will be twice as long than a closed pipe. • The resonances are spaced by half wavelengths, just like closed pipes

Open Pipe Resonance •

Open Pipe Resonance •

Example 1 • Find the relationship between the frequencies of an open and closed

Example 1 • Find the relationship between the frequencies of an open and closed pipe of the same length with the same speed of sound

Example 2 • A soprano saxophone is an open pipe. If all keys are

Example 2 • A soprano saxophone is an open pipe. If all keys are closed, it is approximately 65 cm long. Using 343 m/s as the speed of sound, find the lowest frequency that can be played on this instrument.

Open Pipe Resonance • Work on these problems. There are 3

Open Pipe Resonance • Work on these problems. There are 3

The Ear • Sound travels through the ear canal and vibrates the eardrum •

The Ear • Sound travels through the ear canal and vibrates the eardrum • The eardrum is connected to three little bones which transmit the vibrations to the inner ear.

The Ear • The vibrations travel into the liquid of the cochlea, which has

The Ear • The vibrations travel into the liquid of the cochlea, which has tiny hair cells which vibrate to the sound. • The auditory nerve connected to the tiny hair cells transmit the vibrations as sensations to the brain.

Harmonics • Open and closed pipes resonate at more than one frequency. • Musical

Harmonics • Open and closed pipes resonate at more than one frequency. • Musical instruments using pipe resonators produce sounds that contain more than one resonant frequency. • The lowest frequency is called the fundamental frequency. • Wave frequencies that are whole-number multiples of the fundamental are called harmonics.

 • HOMEWORK DUE 2/8 • Pg 318 5, 6, 7, 9

• HOMEWORK DUE 2/8 • Pg 318 5, 6, 7, 9