NCT - Developers of Noise Cancellation, Noise Reduction and Acoustic Echo Cancellation

The wave files in the tables below demonstrate the performance of our noise and echo reduction algorithms. Each wave file plays voice and noise followed by voice after the ClearSpeech algorithm has removed/reduced the noise.

If you wish to measure the benefits of ClearSpeech using your own wave files, you can download a Windows®-based software program of ClearSpeech-PC.

Click to download (file size: 6.18 MB).

Adaptive Speech Filter
	Removal of road noise from speech using ASFII (133k)
	50 mph car noise removed from speech (170k)
	Sports car noise removed from hands-free mobile communications (218k)
	Tonal emergency alarm noise removed from speech (230k)
	Static noise removed from commercial broadcast radio (146k)

For more information on Adaptive Speech Filter, click here.

Adaptive Speech Filter & Acoustic Echo Cancellation
	Acoustic echo and car noise (50 mph) removed from hands-free cellular communications (159k)

For more information on Adaptive Speech Filter, click here.
For more information on Acoustic Echo Cancellation, click here.

Acoustic Echo Cancellation
	Removal of short tail length acoustic echo from a cellular videophone (200k)
	Acoustic echo removed from hands-free Internet telephony call (198k)
	Acoustic echo removed during double-talk (312k)

For more information on Acoustic Echo Cancellation, click here.

Referenced Noise Filter
	Removal of reverberation from a Public Address System (160k)
	Background music removed from speech (134k)
	Background wail siren noise removed from speech (261k)
	Background yelp siren noise removed from speech (250k)

For more information on Referenced Noise Filter, click here.

Line Echo Cancellation
	Echo reduction achieved by Line Echo Cancellation algorithm (360k)

For more information on Line Echo Cancellation, click here.

Intelligent Squelch Filter
	Pops and pre-speech noise removed from radio communication signal (209k)

For more information on Intelligent Squelch Filter, click here.

Speech in Noise Detector
	Muting of non-speech segments in a noisy signal (154k)

For more information on Speech in Noise Detector, click here.

email: sales@nctclearspeech.com