Patent ID: 8090110
Filing Date: 2012-01-03
Classification: H04N

Abstract:
1. A method for determining a sound standard for an input sound signal, the method comprising: filtering the input sound signal to obtain a first filtered signal corresponding to a first frequency and a second filtered signal corresponding to a second frequency; frequency-demodulating the first filtered signal to obtain a first demodulated filtered signal, and determining whether the input sound signal contains a FM (frequency modulation) analog component corresponding to the first frequency according to a phase change of the first demodulated filtered signal; decoding the second filtered signal according to a digital sound standard to obtain a bit stream; interpreting the bit stream according to the digital sound standard, and determining whether the interpreted bit stream is interpreted successfully, so as to determine whether the input sound signal contains a digital component corresponding to the digital sound standard; and determining whether the input sound signal matches one of a plurality of known sound standards based on whether the input sound signal contains the FM analog component corresponding to the first frequency and whether the input sound contains the digital component corresponding to the digital sound standard.