Active Noise Reduction Noise & Echo Cancellation Algorithms Advanced Hearing Protection Technology Noise & Echo Cancellation Algorithms ClearSpeech® is a suite of algorithms designed to remove background noise and echo from a speech signal.  These breakthrough technologies dramatically improve communications clarity and intelligibility of communications.  Pro Tech will integrate this technology into headset products and systems. The ClearSpeech® Adaptive Speech Filter (ASF) noise cancellation algorithm removes up to 95% of stationary, or constant, noise from a signal containing noise and speech. ClearSpeech® Acoustic Echo Cancellation (AEC) is an algorithm designed to continuously and adaptively remove acoustic echo from speech.   Acoustic echoes are produced by the open-air acoustic path between the loudspeaker and the microphone in hands-free full-duplex communication systems.   By continuously tracking changes in this acoustic path, AEC effectively eliminates the echo, improving the clarity of the communication system. Car noise removed from hands-free mobile communications Click to hear Background echo removed from near end send signal Click to hear For more information about the use of ClearSpeech Technology in applications other than headsets as well as licensing opportunities please visit www.nctclearspeech.com.

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