Detection of EEW wake-up signal with AC parity for ISDB-T television receivers

Abstract

When local meteorological agencies advise an emergency alert, ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) television broadcasters would send a special signal to wake up the receivers. There are two ways of waking up: “Emergency Warning System (EWS)” that advises tsunami and earthquake disasters, and “Earthquake Early Warning (EEW)” that advises significant earthquake disasters. For detecting EWS wake-up indications, the use of the parity has been proposed. The method assumed the broadcasters do not change the message except for the wake-up indication. Because we cannot apply the method to an EEW wake-up indication detection, this letter proposes a method for EEW.