Handsfree intra oral electronic bluetooth larynx
The electrolarynx is the most widely used device for speaking without vocal cords. However, its use is not very elegant, therefore I built a prototype of an electronic bluetooth larynx. The electronic larynx can improve the life of laryngectomy patients.
Operation of the electronic larynx
The electronic larynx is a miniature speaker, invisible hidden in the mouth, that produce the sound that is normally produced by the vocal cords. In this way, a person can speak by articulating as usual without producing a sound themselves.
The electronic larynx is put between the lower premolars and the cheek. The advantage is that there is much space and the speech is not hindered by the device.
This video shows a simulation of the electronic larynx when it is used used with pitch control and vowel control:
Unfortunately, I've had very little time to make decent demonstration videos. The problem is that there is no remote control yet, so I had to pre-record the sound and then, as it were, post-sync.
The electronic larynx contains a small phone speaker, amplifier, bluetooth module and a battery. In my simple prototype, the sound is coming from the smartphone, where it is stored, and than sent to the electronic larynx via bluetooth.
There was a patent on an identical device granted in 1994, which has now expired: https://www.google.com/patents/US5326349. However, this patent has not been exploited. The patent describes the operation of the electronic larynx in detail.
Electronic bluetooth larynx circuit
The Iphone SE speaker is reduced in size and the hole that arises is sealed with 5 min epoxy glue.
Note other glue can damage the interior of the speaker due to vapor.
An waterproof ear mesh is glued to the Iphone SE speaker with epoxy.
- The voice of the patient before the laryngectomy can be recorded so that the voice is retained.
- The articulating is greatly simplified if you can choose a number of vowels, instead of, for example, just the aaa.
- By using a wireless remote control that allows you to control the vowels and pitch, the speech sounds very natural.
I don't have time to develop the remote control. Here's an impression of what the remote control might look like. The idea is that you can control 4 vowels and the pitch with the fingers of one hand. The pitch is controlled by the force by which the vowel button is pressed.
I only made a simple prototype, many improvements are possible, for example:
- Take a larger battery
- Take a loudspeaker with more volume
- Making water proof by using wireless charging
- Making water proof by using auto power-on
- Prevent the speaker from being blocked by the cheek
- How to use an Artificial Larynx Device for laryngectomees
- Hands-Free Wearable Electrolarynx using Linear Predictive Coding Residual Waves and Listening Evaluation
- TruTone™ Artificial Larynx Speech Aid for a Laryngectomee
- SolaTone oral adapter
- Vocal cord sounds on Github
- Electrolarynx in voice rehabilitation
- Samplefocus audio samples
- Tone generator
- Articulatory phonetics Wikipedia
Who is interested?
I am looking for a university or company that could take this up. I have no commercial interests.