Embedding data in stereo audio using saturation parameter modulation

摘要

In some embodiments, a method for embedding data (e.g., metadata for use during post-processing) in a stereo audio signal comprising frames. Each of the frames has a saturation value, and data are embedded in the stereo audio signal by modifying the signal to generate a modulated stereo audio signal comprising a sequence of modulated frames having modulated saturation values indicative of the embedded data. Typically, one data bit is embedded in each frame of an input stereo audio signal by modifying the frame to produce a modulated frame whose modulated saturation value matches a target value indicative of the data bit. In other embodiments, a method for extracting data from a stereo audio signal in which the data have been embedded in accordance with an embodiment of the inventive embedding method. Other aspects are systems (e.g., programmed processors) configured to perform any embodiment of the inventive method.

主权项

1. A method for embedding data in a stereo audio signal comprising a sequence of frames, said method comprising:
modifying the stereo audio signal to generate a modulated stereo audio signal comprising a sequence of modulated frames having modulated saturation values indicative of the data; and embedding one data bit in each frame of the stereo audio signal by modifying said frame to produce a modulated frame whose modulated saturation value matches a target value indicative of the data bit, wherein the modification of each said frame includes steps of applying a gain to a first modification signal to produce a first scaled signal, adding the first scaled signal to a first channel signal indicative of a first channel of the frame to determine a first channel of the modulated frame, applying the gain to a second modification signal to produce a second scaled signal, and adding the second scaled signal to a second channel signal indicative of a second channel of the frame to determine a second channel of the modulated frame.