How do humans talk?

Speech is produced by bringing air from the lungs to the larynx (respiration), where the vocal folds may be held open to allow the air to pass through or may vibrate to make a sound (phonation). The airflow from the lungs is then shaped by the articulators in the mouth and nose (articulation).

ecampusontario.pressbooks.pub - 2.1 How Humans Produce Speech – Essentials of Linguistics

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2.1 How Humans Produce Speech

Phonetics studies human speech. Speech is produced by bringing air from the lungs to the larynx (respiration), where the vocal folds may be held open to allow the air to pass through or may vibrate to make a sound (phonation). The airflow from the lungs is then shaped by the articulators in the mouth and nose (articulation).

Check Yourself

Video Script

The field of phonetics studies the sounds of human speech. When we study speech sounds we can consider them from two angles. Acoustic phonetics, in addition to being part of linguistics, is also a branch of physics. It’s concerned with the physical, acoustic properties of the sound waves that we produce. We’ll talk some about the acoustics of speech sounds, but we’re primarily interested in articulatory phonetics, that is, how we humans use our bodies to produce speech sounds. Producing speech needs three mechanisms. The first is a source of energy. Anything that makes a sound needs a source of energy. For human speech sounds, the air flowing from our lungs provides energy. The second is a source of the sound: air flowing from the lungs arrives at the larynx. Put your hand on the front of your throat and gently feel the bony part under your skin. That’s the front of your larynx. It’s not actually made of bone; it’s cartilage and muscle. This picture shows what the larynx looks like from the front.

This next picture is a view down a person’s throat.

What you see here is that the opening of the larynx can be covered by two triangle-shaped pieces of skin. These are often called “vocal cords” but they’re not really like cords or strings. A better name for them is vocal folds.

The opening between the vocal folds is called the glottis.

We can control our vocal folds to make a sound. I want you to try this out so take a moment and close your door or make sure there’s no one around that you might disturb. First I want you to say the word “uh-oh”. Now say it again, but stop half-way through, “Uh-”. When you do that, you’ve closed your vocal folds by bringing them together. This stops the air flowing through your vocal tract. That little silence in the middle of “uh-oh” is called a glottal stop because the air is stopped completely when the vocal folds close off the glottis. Now I want you to open your mouth and breathe out quietly, “haaaaaaah”. When you do this, your vocal folds are open and the air is passing freely through the glottis.

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Now breathe out again and say “aaah”, as if the doctor is looking down your throat. To make that “aaaah” sound, you’re holding your vocal folds close together and vibrating them rapidly. When we speak, we make some sounds with vocal folds open, and some with vocal folds vibrating. Put your hand on the front of your larynx again and make a long “SSSSS” sound. Now switch and make a “ZZZZZ” sound. You can feel your larynx vibrate on “ZZZZZ” but not on “SSSSS”. That’s because [s] is a voiceless sound, made with the vocal folds held open, and [z] is a voiced sound, where we vibrate the vocal folds. Do it again and feel the difference between voiced and voiceless. Now take your hand off your larynx and plug your ears and make the two sounds again with your ears plugged. You can hear the difference between voiceless and voiced sounds inside your head. I said at the beginning that there are three crucial mechanisms involved in producing speech, and so far we’ve looked at only two:

Energy comes from the air supplied by the lungs.

The vocal folds produce sound at the larynx.

The sound is then filtered, or shaped, by the articulators.

The oral cavity is the space in your mouth. The nasal cavity, obviously, is the space inside and behind your nose. And of course, we use our tongues, lips, teeth and jaws to articulate speech as well. In the next unit, we’ll look in more detail at how we use our articulators. So to sum up, the three mechanisms that we use to produce speech are:

ecampusontario.pressbooks.pub - 2.1 How Humans Produce Speech – Essentials of Linguistics

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