Mission Critical Voice Start-of-Word Correction for Access Delay Measurement System

Published

June 24, 2021

Author(s)

William Magrogan, Jaden Pieper, Zainab Soetan

Abstract

NIST's Public Safety Communications Research (PSCR) division previously developed an access time measurement method for push-to-talk (PTT) communications systems. This paper introduces a correction term, called the start of word correction, to address a systemic error in the original measurement method. This error can be caused by extraneous audio prior to the start of a Modified Rhyme Test (MRT) keyword in the test audio clips thatwere developed for the access time measurement. Example measurements were performed using the start of word correction to quantify its affect on access time measurements.

Citation

Technical Note (NIST TN) - 2166

Report Number

2166

NIST Pub Series

Technical Note (NIST TN)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.TN.2166

Local Download

Keywords

Access delay, Access time, Articulation Band Correlation Modified Rhyme Test (ABC-MRT), ABC-MRT16, Land mobile radio (LMR), Long term evolution (LTE), Mission critical voice (MCV), Modified Rhyme Test (MRT), Project 25 (P25), Public safety, Push-to-talk (PTT), Quality of experience (QoE), Trunked mode

Citation

Magrogan, W. , Pieper, J. and Soetan, Z. (2021), Mission Critical Voice Start-of-Word Correction for Access Delay Measurement System, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.TN.2166, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932595 (Accessed October 27, 2025)