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  EQUEST: - New automated echo analysis method
HEAD Press Release Herzogenrath, October 31, 2012
New automated echo analysis method
The migration towards NGN (Next Generation Networks) is expected to introduce higher propagation delay in telecommunication. This emphasizes the need for reliable echo control. Wideband telephony will further change speech perception – and echo perception. New investigations demonstrate the necessity to renew tolerances for wideband echo attenuation. These trends also motivate new echo assessment methods.
Thus, HEAD acoustics has developed a new approach based on a hearing model analysis suitable to extend current echo analysis methods: EQUEST, the Echo Quality Evaluation of Speech in Telecommunications. It it available as ACOPT 29 since ACQUA version 3.1.200.
The extension of the standard parameters echo attenuation and echo delay by EQUEST bears a high potential for echo analyses: The incorporation of the sidetone into the model and its value assessment as well as the approach of using a psychoacoustic motivated design leads to a high correlation between EQUEST rating and subscriber’s viewpoint. First tests demonstrate the usefulness of EQUEST for in-depth evaluation of echo disturbances of modern telecom devices.
It can be noted that the analysis of EQUEST replaces or at least supplements an expert’s analysis. Thus, EQUEST can be seen as valuable tool for automated echo testing. The significance of EQUEST particularly manifests in conjunction with the challenges of wideband telephonometry and its specific claims regarding echo performance.
EQUEST calculation in ACQUAlyzer
Steffen Scholz
HEAD acoustics GmbH
Ebertstr. 30a,
D-52134 Herzogenrath
Phone: +49 (0) 2407 577 744
Fax: +49 (0) 2407 577 99
About HEAD acoustics GmbH:
HEAD acoustics was founded in 1986 and has been involved in noise and vibration, electroacoustics and voice quality testing since its inception. HEAD acoustics is based in Herzogenrath, Germany, with affiliates in USA, Japan and France as well as a world-wide network of representatives. The Telecom Division of HEAD acoustics manufactures telecom test equipment and provides consulting services in the field of speech and audio quality. Moreover, HEAD acoustics closely co-operates with DECT Forum, ETSI, ITU-T, TIA and other standardization bodies with regard to the development of quality standards for voice transmission and speech communication. In many partnership projects, HEAD acoustics has proven its competence and capabilities in conducting tests and optimizing communication products with respect to speech and audio quality under end-to-end as well as mouth-to-ear scenarios.
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