Methods and apparatus to perform audio watermarking and watermark detection and extraction

A method comprising:

• determining sets of frequency components for representing a code, wherein a respective set of frequency components of the sets of frequency components represents a part of the code, wherein frequency components of the respective set of frequency components are located in respective code bands, wherein there are multiple code bands, and wherein spacing between adjacent code bands of the multiple code bands is equal to or less than spacing between adjacent frequency components within code bands of the multiple code bands;
• embedding the code in an audio signal by emphasizing the sets of frequency components in the audio signal;
• and
• outputting the audio signal having the embedded code.

A non-transitory computer-readable medium having stored therein instructions that when executed by a computing system cause the computing system to perform a set of acts comprising:

• determining sets of frequency components for representing a code, wherein a respective set of frequency components of the sets of frequency components represents a part of the code, wherein frequency components of the respective set of frequency components are located in respective code bands, wherein there are multiple code bands, and wherein spacing between adjacent code bands of the multiple code bands is equal to or less than spacing between adjacent frequency components within code bands of the multiple code bands;
• embedding the code in an audio signal by emphasizing the sets of frequency components in the audio signal;
• and
• outputting the audio signal having the embedded code.