Objective Speech Quality Estimates for Project 25/Voice over Long Term Evolution (P25/VoLTE) Interconnections   [open pdf - 3MB]

Taken from the Abstract: "In an extended Project 25/Voice over Long Term Evolution (P25/VoLTE) public safety communication system, voice signals will pass through both Multi-Band Excitation (MBE) and Adaptive Multi-Rate (AMR) speech coders. Thus, it is important to quantify the speech quality that can be expected for MBE, AMR, and combinations of these speech coders. We used the Perceptual Evaluation of Speech Quality (PESQ) algorithm to provide initial assessments of speech quality for these coders alone and in combinations. Funding for this work was provided by the U.S. Department of Homeland Security's (DHS) Science and Technology Directorate, through its Office for Interoperability and Compatibility. The work was conducted at the Public Safety Communications Research program's Boulder, Colorado, laboratories under the supervision of J. R. Bratcher. Certain commercial equipment and materials are identified in this report to adequately specify the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, National Institute of Standards and Technology, or DHS, nor does it imply that the material or equipment identified is the best available for this purpose."

Public Domain
Retrieved From:
FirstResponder.gov: http://www.firstresponder.gov/
Media Type:
Help with citations