Methods and system for cue detection from audio input, low-power data processing and related arrangements

A method, comprising:

• obtaining audio input;
• at a first processor, processing the audio input to discern a characteristic of the audio input;
• wherein processing the audio input to discern the characteristic of the audio input comprises processing the audio input to discern auxiliary data conveyed by a digital audio watermark signal present within the audio input,
• the processing of the audio input to discern the auxiliary data comprising:
• buffering frames of the audio input, transforming the frames into spectral magnitude frames, accumulating spectral magnitude frames into an accumulation buffer, extracting spectral magnitude values corresponding to selected bits of the digital audio watermark signal, and correlating the extracted spectral magnitude values with a predetermined signal to produce a correlation metric;
• generating an output based upon the processing to discern the characteristic;
• and
• controlling an operation of a second processor distinct from the first processor based on the generated output.