Patent ID: 8571500

Claim:
An emergency broadcast radio receiver comprising: a signal detector circuit, when powered, adapted to detect a predetermined emergency broadcast signal; a timing generator circuit adapted to couple a battery to the signal detector circuit to periodically power the signal detector circuit; and a demodulator circuit, when powered, adapted to demodulate an audio signal modulated on a radio frequency signal at a tuning frequency; wherein: the signal detector circuit, on detection of the predetermined emergency broadcast signal, is adapted to couple the battery to the demodulator circuit to power the demodulator circuit; and the emergency broadcast radio receiver is adapted to set the tuning frequency to one of a plurality of predetermined emergency bulletin frequencies on detection of the predetermined emergency broadcast signal by the signal detector circuit, a setting of the tuning frequency being dependent on a power of demodulated audio signal at each of the plurality of the predetermined emergency bulletin frequencies, wherein the audio signal modulated on the radio frequency signal on at least the one of the plurality of the predetermined emergency bulletin frequencies contains emergency bulletin information.