People with auditory diversity make access to auditory information differently; for this they use support products that improve the quality and / or increase the volume of the sound or convert the auditory information into information that can be perceived by other senses.

Straight Language for the Deaf: A System of Instruction for Deaf Children

Fitzgerald's seminal work 'Straight Language for the Deaf: A System of Instruction for Deaf Children' was published in 1926 and was widely influential in the field of deaf education. Because the "Fitzgerald Key" gave additional visual support to those who had not heard language construction, it allowed students to correct their own grammar and syntax mistakes. At one time, her system was so widely used that three-quarters of the schools in the United States teaching those with hearing difficulties used it. Her book had been through nine editions by 1962.

Fitzgerald, E. M.

Edith Mansfield Fitzgerald (1877–1940) was a deaf American woman who invented a system for the deaf to learn proper placement of words in the construction of sentences. Her method, which was known as the 'Fitzgerald Key,' was used to teach those with hearing disabilities in three-quarters of the schools in the United States. Source: Wikipedia

American Speech-Language-Hearing Association (ASHA)

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ASHA is the national professional, scientific, and credentialing association for 186,000 members and affiliates who are audiologists; speech-language pathologists; speech, language, and hearing scientists; audiology and speech-language pathology support personnel; and students. Audiologists specialize in preventing and assessing hearing and balance disorders as well as providing audiologic treatment, including hearing aids.

Tinteo Personal Sound

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Tinteo offers products at the forefront of technology : noise cancellation, selective sound amplification…
Research and development in signal processing are at the heart of our strategy. We work with public laboratories and medical institution to transfer the latest innovation and to check that our products fulfill the needs of the people.


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Subtil. Communication and Accessibility is a company dedicated to accessibility and linguistic services. The Subtil team is located in Barcelona, although we work at a national and international level, and is made up of qualified, committed professionals with broad experience.