Methods and apparatus to extract audio codes are disclosed. An example method includes receiving signals on a plurality of channels (101-104) and ranking the signals based on at least one characteristic of the signals via a signal ranker (108). A first channel from the plurality of channels is selected based upon the ranking of the signals via a channel selector (110). The example method further include determining whether a first signal on the first channel includes at least one code and extracting the at least one code from the first signal when the first signal includes the at least one code.