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Laryngo Voice

The Laryngo Voice solution is developed on the basis of the research by the University of West Bohemia in Plzeň and its goal is to help patients suffering from cancer of the larynx. In many cases people with this illness must undergo a total laryngectomy, a medical surgery in which the entire larynx, including the vocal cords, is removed, leading to the loss of the ability to speak. With the use of Laryngo Voice, however, their voice can be preserved, and even continued to be used in communication by means of text-to-speech synthesis. The voice is generated on the basis of stored recordings of phonetically rich sentences from the period before the surgery. The voice synthesizer is installed on a portable device (i.e. a mobile phone, tablet, notebook) and the patient itself can control the artificially created voice. This modern solution ensures the arfiticially generated voices great similarity to the patients original voice .

The first phase of the voice conservation process is a sound recording of the patient’s voice before the surgery, which is performed in a specialised recording studio. Home recordings are currently being tested, however. The selected texts that are recorded are carefully chosen to effectively capture a wide range of the given patient’s vocal expression.

After recording the patient’s voice, a control of the spoken text and a phonetic-prosodic analysis are carried out. The recordings are processed, parameterised and segmented. The result is a voice module compatible with these speech synthesis methods:

» statistical parametric speech synthesis (the speech is generated on the basis of statistical models, with the use
of hidden Markov models
and newly also deep neural networks) 

» unit selection (speech is produced by concatenation carefully selected short segments of natural speech)

Laryngo Voice is constantly being improved. We are focusing our current efforts on the full automation of the system, where the entire process, from the recording to the creation of the resulting synthetic voice, would not require human assistance. If Laryngo Voice reaches this phase, it would be absolutely unique, in comparison to the competition, for its compete automation and for the speed in which it would be possible to create a quality synthetic voice system and to immediately install it on commonly used portable devices.

Other known projects dealing with the creation of personal synthetic speech systems are predominantly focused on statistical parametric speech synthesis. An average statistical model created using a large number of different voices is usually adapted for a concrete user on the basis of his/her voice recordings. The similarity between the resulting output and the voice of the person in question is usually hard to accomplish, however.

The goal for the future is also to adapt the current parameters of Laryngo Voice for voice modulators and a “speech prosthesis” that will be part of the patient’s body.

Laryngo Voice and its testing

From the very beginning of the project the University of West Bohemia has been cooperating with the Department of Otorhinolaryngology and Head and Neck Surgery in Motol University Hospital. Laryngo Voice has been clinically tested. Patients that have been diagnosed with cancer of the larynx are offered the possibility of recording their vocal expression. A personal synthetic speech system has already been created for twenty patients.

The response from patients that have tested this solution shows that the system is able to significantly improve the quality of their communcation in their personal and professional lives and is very positively received by their loved ones. Laryngo Voice does not only have to be used by patients that have undergone a total laryngectomy. It can be used by anyone who would like to preserve the voice of any person. 

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