Hearing. Ear Mechanics. The ear is collects and amplifies sound. Initial receiver is the eardrum. Sensitive to tiny pressure changes Middle ear transmits the sound through bone. Act as levels magnifying force by 40 Inner ear (cochlea) separates pitches. Breaks up superposed waves
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Brain uses the time difference to tell direction.
Hard with short wavelength.
Stereo speakers reconstruct timing differences.
Constructive and destructive interferenceSpeaker Systems
The separation of peaks is the period T = 1 / f
The difference in frequencies is the beat frequency Df.
The beat period T = 1 / Df.
What is the pitch of the piano string?
Will the tuner ever get it tuned perfectly?
The beat frequency is 20 beats / 5 s = 4 Hz.
The piano string could be either at 444 or 436 Hz.
Note: a beat period of 1 min would get a frequency accurate to 0.016 Hz.In Tune