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  HMS Mouth Suitable for Superwideband Testing
HEAD Press Release Herzogenrath, October 31, 2012
HMS Mouth Suitable for Superwideband Testing
One of the problems for measuring superwideband systems in send direction is the need to use an artificial mouth with a sound production from 50 Hz to at least 14 kHz. While the frequency response of the mouth does not have to be flat, a reasonable mouth equalization should be possible for the complete frequency range.
The HEAD acoustics HMS II.3 can be easily equalized from 50 Hz to 14 kHz. Therefore, it can be clearly stated that HMS II.3 is ideally suited for real speech measurements and is currently the only device complying with ITU-T P.57 & P.58 while simultaneously fulfilling mouth equalization requirements for superwideband.
Typical equalization curve of HMS II.3 at MRP
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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