Sepura Licenses NCT's Clearspeech Technology for Tetra Handsets

7/22/2005 - Cambridge technology company NCT, announced that their ClearSpeech noise reduction technology has been licensed to Sepura for integration into their TETRA hand-held radios. Sepura is the world’s leading independent TETRA terminal supplier. Its handsets are used worldwide by the emergency services and the military, as well as transport and utility companies.

ClearSpeech is a suite of complex, highly refined software algorithms that provide noise cancellation for human listeners, noise cancellation for voice recognition, echo cancellation and signal conditioning. By removing background noise and voice echo, ClearSpeech is able to vastly improve voice quality in a diverse range of communication systems.

“ClearSpeech technology is ideal for our radios. By removing background noise we are able to ensure that users get the clearest speech possible even in the noisiest of environments” said Malcolm Quelch, Development Director for Sepura. “This is obviously of utmost importance for the emergency service sectors where clear communications is critical.”

Sepura has licensed NCT’s Adaptive Speech Filter algorithm, a component within the ClearSpeech suite of products. The Adaptive Speech Filter (ASF) is a patented algorithm designed to filter noise from signals containing both speech and noise. ASF is effective against a wide variety of 'stationary' noises whose amplitude and pitch change slowly compared to the spectral variations characteristic of human speech.

“We are very proud to have Sepura adopt our ClearSpeech technology for such an application. It is good to know that our voice technology will be used by the emergency services; helping to provide clear communication, often in safety critical circumstances” said Dr Gillian Davis, Managing Director of NCT.

About Sepura Ltd
Sepura is the world’s leading independent TETRA terminal supplier. It designs, develops and supplies digital (TETRA) radios for the public safety market (such as police, fire and ambulance) as well as military, transport and utilities. Sepura, with headquarters in Cambridge, UK, has an international network of distributors and partners supplying customers in over 60 countries worldwide. For more information visit

About NCT Europe Ltd
Trading since 1990, NCT is a world leader in the development of technologies for the removal of noise and echo from communication systems such as mobile phones, radio systems, intercoms, hands-free kits and voice recognition systems. By developing advanced software algorithms that run on DSP's (digital signal processors) and CPU's, NCT has enabled some of the world's top manufacturers to deliver high quality voice-based communication systems. NCT now has sales offices in the UK, the US and Japan. Visit -

NCT (Europe) Ltd is a wholly owned subsidiary of NCT Group, Inc. NCT Group, Inc. (NCTI) is a publicly-traded, high-tech company with a strong technology base. NCTI is rich in intellectual property with 578 patents and related rights.

ClearSpeech® is registered trademark owned by NCT Group Inc.

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