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ReSound Auracast - February 2024

How does DFS Ultra Feedback Cancellation Affect Telephone Use?

Robin C. Donham, AuD, FAAA, CCC-A

November 5, 2012

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Question

When a patient is using the telephone and DFS Ultra reduces gain to avoid feedback, will it degrade the patient’s ability to understand?

Answer

DFS Ultra is ReSound’s adaptive feedback cancellation system. This advanced system ensures that the feedback path is as accurate as possible for each microphone on the hearing instruments and also places limitations on how much it can adapt to changes in the feedback path.  In situations with large changes in the feedback path, such as holding a phone near the hearing instrument, the system incorporates an additional algorithm, Whistle Control. Whistle Control serves as an additional layer of feedback control by reducing the occurrence of feedback that arises from dynamic, transient situations such as using the telephone. Feedback that manages to elude the cancellation system is controlled via gain equalization instead of gain reduction in the frequency range of the feedback. This means that based on the individual’s target gain curves, gain is equalized to match the target curves to combat feedback in lieu of notching or fast-acting gain cuts at the frequencies of the feedback. The signal itself is unaffected while the feedback spike is equalized, thereby simultaneously maintaining audibility while eliminating feedback.  It is important to note that Whistle Control does not reduce gain below the desired response and therefore does not affect audibility. In effect, DFS Ultra restores or equalizes the correct gain and maintains the sound quality, while eliminating feedback.

For more information on ReSound Verso, visit www.gnresound.com or the ReSound Expo Page on Audiology Online.


robin c donham

Robin C. Donham, AuD, FAAA, CCC-A

Product Training Manager for the Government Services Division

Robin Donham, Au.D, F-AAA, CCC/A, is a graduate of Texas Tech University Health Sciences Center. She has worked with Interton as the National Training Manager for the last two years. Currently she is serving as Product Training Manager for the Government Services Division of GN Resound. Previously, Robin was an account manager for the Government Services Division of Interton. She has fit and dispensed hearing aids at the West Texas Rehab Center in Abilene, TX and also been a national presenter for Audiologyonline.com, HealthNet.com, and a presenter and charter member of the Abilene Chapter of the Hearing Loss Association of America (HLAA) formerly Self-Help for the Hard of Hearing (SHHH). She has also been a presenter and public speaker on Audiology related issues with organizations such as the HLAA, the Lion’s Club, Texas Health Fairs, Universities and other educational settings, and Industrial settings, to name a few.  She has research publications and/or poster presentations in balance disorders, electroacoustic testing, hearing aid technology, and team building.  Presenter employed by GN Resound.


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