Patent ID: 8208640

Claim:
An audio multi-standard detection apparatus, having a plurality of pre-recorded audio broadcasting format carrier bands, comprising: a carrier calculation unit, for receiving an intermediate frequency signal and calculating a first carrier energy of the intermediate frequency signal in each of the pre-recorded carrier bands; and a switch controller, for gathering statistic information of the first carrier energy in each of the pre-recorded carrier bands in order to obtain at least one frequency band where a carrier exists, and for analyzing the at least one obtained frequency band with respect to at least one threshold value to determine at least one effective carrier, from which an audio broadcasting format is confirmed, wherein the audio broadcasting format confirmed by the switch controller comprises the at least one corresponding effective carrier; wherein the at least one effective carrier comprises at least one primary carrier, the primary carrier being analyzed using a hysteresis scheme to analyze an analog primary carrier and using a floating scheme to analyze a digital primary carrier.