Multiple scrambled layers for audio watermarking

A non-transitory computer-readable storage medium comprising instructions that, when executed by one or more processors, cause the one or more processors to at least:

• map watermark symbols to first pluralities of frequency bins over a plurality of frequency clumps based on a first bin distribution corresponding to a first watermark layer;
• map the watermark symbols to second pluralities of frequency bins over the plurality of frequency clumps based on a second bin distribution corresponding to a second watermark layer, the second bin distribution related to the first bin distribution based on a first sequence of shifts;
• determine a second sequence of shifts different from the first sequence of shifts;
• generate a third bin distribution corresponding to a third watermark layer based on the second sequence of shifts, the third bin distribution to map the watermark symbols to third pluralities of frequency bins over the plurality of frequency clumps;
• communicate the third bin distribution to an encoder to enable the encoder to generate an encoded audio signal with the watermark symbols based on the third bin distribution;
• and
• communicate the third bin distribution to a decoder to enable the decoder to extract the watermark symbols from the encoded audio signal.

A method comprising:

• mapping watermark symbols to first pluralities of frequency bins over a plurality of frequency clumps based on a first bin distribution corresponding to a first watermark layer;
• mapping the watermark symbols to second pluralities of frequency bins over the plurality of frequency clumps based on a second bin distribution corresponding to a second watermark layer, the second bin distribution related to the first bin distribution based on a first sequence of shifts;
• determining, by executing an instruction with a processor, a second sequence of shifts different from the first sequence of shifts;
• generating, by executing an instruction with the processor, a third bin distribution corresponding to a third watermark layer based on the second sequence of shifts, the third bin distribution to map the watermark symbols to third pluralities of frequency bins over the plurality of frequency clumps;
• communicating the third bin distribution to an encoder to enable the encoder to generate an encoded audio signal with the watermark symbols based on the third bin distribution;
• and
• communicating the third bin distribution to a decoder to enable the decoder to extract the watermark symbols from the encoded audio signal.