On Thursdays the USPTO publishes new pending patent applications. Both of today's Spotlight Applications address aspects of digital watermarking and both are assigned to Thomson. The first application discloses techniques for fault detection using embedded watermarks. The second application discloses techniques for volume marking with low-frequency carriers.
20100138730, "Fault detection using embedded watermarks," assigned to Thomson.
Detection of faults in a transmitted signal stream occurs by recovering, from the information stream, a water mark embedded in the stream prior to transmission. The embedded watermark has data characteristic of stream quality. Thereafter, the at least one watermark property is analyzed to detect faults in the received information stream.
20100135523, "Volume marking with low-frequency," assigned to Thomson.
A method and apparatus for embedding watermark data into a data stream using the insertion of low frequency carriers modulated by the watermark data into selected spatio-temporal volumes having equal total luminance values.