Faking sickness to get off work is about to get harder. Very soon your boss might be able to tell whether or not your symptoms are real, just from the sound of your voice
As anyone who has woken up with a runny nose and a voice like Darth Vader can attest, infection with the common cold virus alters how a person’s voice sounds. That is because the vocal cords often become inflamed, which changes their acoustic properties. The tissue temporarily swells and, therefore, vibrates at a lower pitch, which tends to make people with a cold develop a deeper voice.
Together these sets of notes fit into mathematical patterns called harmonics, with overtones having frequencies that are multiples of the original note. For example, the pitch of the second harmonic note is twice the frequency of the main note and so on. The amplitude of these harmonics in speech tends to diminish as they proceed up the frequency scale.
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