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DFS Ultra. No Compromise.   

ReSound technology has long led the field in preventing artifacts with its use of two cancellation filters, adaptive filter constraints and separate cancellation filters for dual microphone instruments. DFS Ultra is the next generation of feedback suppression software. 

Today, every hearing aid manufacturer has a feedback suppression system – but often with tradeoffs.  DFS Ultra simply doesn’t compromise and offers outstanding feedback protection.

Undistorted sound quality 

With DFS Ultra, in addition to technical enhancements that enable even more accurate feedback path modeling, a new component of the system is input signal modeling. Unlike other systems which only attempt to model the feedback path, this unique functionality also maintains a representation of the sound entering the hearing instrument.

The advantage of this component is that the system can more easily distinguish between feedback and non-feedback sounds, vastly improving the dynamic behavior of the system. Important everyday sounds like phone rings, alarm beeps and music can be amplified to desired levels without being mistaken for feedback.


DFS Ultra
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Most challenging dilemma solved 

The last decades’ growth in popularity of open fittings has challenged the industry in providing sufficient, undistorted high frequency gain without feedback. DFS Ultra, including WhistleControl™, meets the challenge.

Because the feedback cancellation is constrained to not adapt to signals that are very disparate from the feedback pathway model, it is possible for intermittent feedback to occur in daily life situation, such as when wearing a hat or using the phone. The combination of DFS Ultra and WhistleControl™ restores the desired response when feedback is imminent. This ensures feedback-free performance.


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No compromise: Optimal phone comfort  

An external clinical trial comparing feedback of Alera to other high end products on the market was conducted in summer 2010. Participants held a telephone up to the test devices programmed to the manufacturers’ first-fit gains, and it was noted whether feedback occurred. Although no feedback was experienced with Device C, this particular hearing instrument prescribed on average 10 dB less high frequency gain than the others. The ReSound Alera with DFS Ultra and Whistle Control™ demonstrated the lowest occurrence of feedback compared to devices with similar gain.

This means that even while engaging in the most
feedback-prone activities, such as talking on a cell
phone, hearing instrument users fitted with DFS Ultra
can enjoy state-of-the-art feedback control without sacrificing audibility or superior sound quality.

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For more information, please see our white paper on DFS Ultra