Mission critical voice start-of-word correction for access delay measurement system

Abstract

NIST's Public Safety Communications Research (PSCR) division previously developed an access time measurement method [1] 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 Modifed Rhyme Test (MRT) keyword in the test audio clips that were developed for the access time measurement. Example measurements were performed using the start-of-word correction to quantify its affect on access time measurements.

Mission critical voice quality of experience probability of successful delivery measurement methods

“…This paper describes the probability of successful delivery (PSuD) KPI, which estimates the likelihood that a message will be successfully received under a particular test condition. The PSuD measurement builds from the same framework as previously described KPIs, end-to-end access time [2][3][4] and mouth-to-ear (M2E) latency [5].…”