Patent ID: 8184201

Claim:
A method of automatically determining audio standard for terrestrial broadcast comprising: scanning for each audio frequency standard of interest in a current SIF frequency band in an incoming broadcast signal by using a energy estimation algorithm; computing energy at each known audio frequency standard of interest using the energy estimation algorithm within a predetermined time interval; comparing the computed energy at each audio frequency standard of interest to a predetermined threshold energy; and determining at each audio frequency standard of interest whether the audio frequency standard of interest is detected based on the outcome of the comparison, wherein computing the energy at each audio frequency standard of interest using the energy estimation algorithm comprises: computing the energy for a predetermined number of audio frequencies indexed substantially around each known audio frequency standard of interest within the current SIF frequency band; comparing each computed energy that is substantially around each audio frequency standard of interest with a predetermined threshold value and determining a number of computed energies that are above or equal to the predetermined threshold value; and comparing the determined number of computed energies to a predetermined number and determining at each audio frequency standard of interest whether audio frequency standard of interest is detected.