Specsavers

PureWave Feedback Eliminator

PureWave Feedback Eliminator prevents feedback in a wide variety of environments by setting the desired adjustment control (Off, Static, or Adaptive) per memory. In addition, the Adaptive sensitivity (high or low) per memory can be selected in specific products to reduce the Output Phase Modulation speed for patients who experience a Talking-In-the-Fan (TITF) artifact when feedback manager is active. PureWave Feedback Eliminator is available on all products except Advance 21 and Advance 20. See Active Feedback Intercept for these products.

Maximum Stable Gain (MSG) data including the Added Stable Gain (ASG) can be viewed per memory for the hearing aid(s). The graph displays the range of stable gain in each channel and at what frequencies the gain may be limited. Added Stable Gain (ASG) is a measurement of the feedback canceller performance and reflects the additional gain available when the PureWave Feedback Eliminator is initialized. The larger the number, the less chance there is for potential feedback.

PureWave Feedback Eliminator should be initialized first before setting individual memories and viewing Maximum Stable Gain. Static cannot be selected until a successful initialization has occurred during the current fitting. Once a successful initialization is complete, the adjustment control setting automatically defaults based on the memory selected. Telecoil and Autocoil are automatically set to Off and disabled unless Enable M/T is checked via Memories, Music is automatically set to Static, and all other memories are automatically set to Adaptive.

  1. Connect and select the desired hearing aid(s) to adjust via Get Started.

    Note:  The hearing aid(s) must be in the patient's ear(s) and the patient should remain quiet during the measurement.

  2. Click Quick Connect or Session Connect.

    Note:  If QuickFit is selected for the default fitting view via General Preferences, the QuickFit screen automatically displays. Continue at step 5.

  3. Click Fitting from the Left Navigation Menu.

  4. Click QuickFit.

    Tip:  PureWave Feedback Eliminator initialization can also be run during Auto Path.

  5. Click PureWave Feedback Eliminator .

    Tip:  Click Tools from the Menu Bar and click Feedback Manager to access.

  6. Click Begin to start the initialization measurement and an animated icon appears indicating the presence of a brief, complex sound in the patient's ear.

    Note:  This button is only enabled during a live fitting. If a good static filter was obtained through the initialization, both the word Initialized and , , or icon displays.
     
    Tip:  The Begin button changes to Cancel during the initialization process. Click Cancel to cancel the initialization.

  7. Inspire automatically defaults to a binaural Select Binaural view if applicable. To adjust only the right or left hearing aid, click Select Right Only or Select Left Only.

  8. Click on the specific memory to view the adjustment control setting assigned.

    Tip:  Click on the Off, Static, or Adaptive radio button representing the desired adjustment control setting for the right hearing aid only, both hearing aids, or the left hearing aid only. Static is recommended for patients who have specific lifestyle environments where an adaptive feedback cancellation system is not desired such as healthcare workers and musicians who are exposed to high frequency, repetitive sounds which may be interpreted as feedback. The Static setting would not attempt to cancel these sounds automatically.
     
    Note:  Memories can only be selected for Advance 22 products when viewing Maximum Stable Gain data in step 10.

  9. To adjust the Adaptive sensitivity, click on the High or Low radio button representing the desired sensitivity for the right hearing aid only, both hearing aids, or the left hearing aid only.

    Note:  This feature is only available for  wireless BTE 13 and wireless RIC 312 products.
     
    Tip:  To adjust the feedback sensitivity for Advance 23 and Advance 22 products, click on the words PureWave Feedback Eliminator and a pop-up window displays. Click on the red, gray, or blue radio button representing the desired sensitivity for the right hearing aid only, both hearing aids, or the left hearing aid only.

  10. Click to view the Maximum Stable Gain data.

    Note:  This button is only enabled if the initialization was successful. Maximum Stable Gain references 2cc Coupler Gain, which may differ from the graphical view currently selected. The graph displays a single value for the Peak Added Stable Gain (in dB), Maximum Stable Gain per channel, as well as bars representing the available gain margin on a per channel basis. The blue or red bars represent the amount of gain margin for each of the channels and the yellow bars (when present) represent the channel specific amount of gain with potential feedback.

  11. If the memory currently selected is dynamic, click or to view the memory's directional or omni Maximum Stable Gain data.

    Note:  This feature is only available if the hearing aid connected supports a directional system. If there is feedback potential in any of the memories, the Auto Gain Adjust icon is enabled.

  12. Click to perform an automatic gain adjustment and a pop-up window displays if more than one memory has potential feedback.

    Note:  The memories that have potential feedback are automatically checked. If only one memory has potential feedback, the pop-up window does not display and the auto gain adjustment is automatically applied. Continue at step 15.

  13. Uncheck any memories to maintain the current settings and click Apply.

    Tip:  Click X in the upper right hand corner to cancel the auto gain adjustment.
     
    Tip:  Click to hide the Maximum Stable Gain data.

  14. Click Close to close PureWave Feedback Eliminator.

    Tip:  To reverse any auto gain adjustments, select 'Gain Decrease' in the list of undo actions.