voice occurs in humans as a result of vibration of vocal cords in
the larynx by exhalation air with help from neighboring muscles
that is surrounded by nine small cartilages. All contribute with
lips, tongue, teeth,
to give out the tone of voice that differentiates us from others.
It is surprising that in spite of the great similarities in twins,
but each of them has different voice from the other.
Voice print and crime detection:
Criminal investigation uses the voice print to check person
identity. When the person says a word, it is converted to visual
vibration using the spectrograph machine that analyzes the voice.
Banks use it for their customers to open their own safe box.