Patent ID: 8798133

Claim:
A method comprising: encoding test data into a video portion of a content signal to determine which frames of the video portion can be used to encode auxiliary data in at least one of the video portion or an audio portion of the content signal; analyzing a plurality of the frames of the content signal based on a selection criterion to identify a display frame; encoding auxiliary data in the audio portion of the display frame of the content signal based on an audio encoding technique; and separately encoding the auxiliary data in the video portion of the display frame based on a video encoding technique, the video encoding technique altering an active portion of the display frame through a chrominance modulation video encoding technique, a luminance modulation video encoding technique, or both the chrominance modulation video encoding technique and the luminance modulation video encoding technique; wherein encoding of the auxiliary data in the audio portion and the video portion is based on analysis of the plurality of frames, and wherein encoding of the same auxiliary data in the audio portion and the video portion of the display frame produces a modulated content signal.