Example 1.7

Out of tune, in tune: hear the beats

0:000:00

What you hear

A pure tone at 440 Hz, then one at 442 Hz, each fine alone; then both together, out of tune: the sound swells and fades twice a second; then two tones at 440 Hz together, in tune: no beats. A short rest between

Every example in Part 1

Example 1.1Pitch is frequency: 440 Hz, 880 Hz, then a piano
Example 1.2A tone and a noise
Example 1.3One pitch, four timbres
Example 1.4Two notes, one timbre
Example 1.5The note circle, up and down
Example 1.6One octave: A4 and A5
Example 1.7Out of tune, in tune: hear the beats
Example 1.8440 Hz or 432 Hz?
Example 1.9How small is a cent?