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Delayed Auditory Feedback vs Frequency Altered Feedback

The use of technology to enhance fluency can be divided into two methodologies - Frequency Altered Feedback (FAF) and Delayed Auditory Feedback (DAF).

Delayed Auditory Feedback works on various platforms including certain mobile apps (it started with Reel to Reel tape delay). It is the easiest of the Altered Audio Feedback sounds to reproduce, however it has limitations. There is defiantly a place for DAF on a mobile especially for low cost evaluation purposes.

Frequency Altered Feedback is far more complex to reproduce. VoiceAmp uses this method which includes noise suppression and other algorithms to provide a superior solution. The technology used by the VoiceAmp device cannot be replicated using mobile apps.


Some point to consider:

  • You can’t use the DAF effect while speaking on a mobile phone.
  • VoiceAmp devices support the Tele-coil option for the wireless receiver.
  • The VoiceAmp advanced noise cancellation (Noise gate) and close proximity microphone help improve the effectiveness of this dedicated device.
  • The VoiceAmp adaptive algorithms prevent the so called ‘wearing off effect’ by adapting the audio profile continuously.
  • The VoiceAmp device is extremely robust and has long battery life.
  • The VoiceAmp device has undergone extensive clinical trials and meets several international safety and quality standards.
  • The VoiceAmp device meets many medical aid subsidy programs.
  • Many VoiceAmp users have used our devices in excess of 10 years.
  • VoiceAmp offers an extended warranty and local servicing.

Contact and Support

VoiceAmp is continually improving existing technologies and exploring new techniques to improve fluency. We value your feedback. For technical support, please contact us.

Technical Support


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