Thursdays the PTO publishes new pending patent applications. Both of today's Spotlight Applications concern aspects of digital watermarking. Assigned to Nielsen, the first application discloses a compressed domain encoding apparatus and methods for use with media signals. Assigned to Fraunhofer (DE), the second application discloses techniques for the direction of arrival estimation using watermarked audio signals and microphone arrays.
20140172434, "Compressed domain encoding apparatus and methods for use with media signals," assigned to the The Nielsen Company.
Apparatus, methods, and articles of manufacture for encoding a compressed media stream are disclosed. Example method of watermarking a digital media signal disclosed herein include copying compressed audio packets associated with an audio stream included in a transport stream of the digital media signal into respective frames of compressed audio data to be watermarked to include media identification information. Such example methods can also include determining whether a composition of the transport stream has changed during copying of the compressed audio packets into the respective frames of the compressed audio data. Such example methods can further include, if the composition of the transport stream has changed, writing the frames of the compressed audio data to an output stream corresponding to the digital media signal without applying a watermark to the frames of the compressed audio data.
20140172435, "Direction of arrival estimation using watermarked audio signals and microphone arrays," assigned to the Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. (DE).
An apparatus for providing direction information based on a reproduced audio signal with an embedded watermark includes a signal processor, which is adapted to process at least two received watermarked audio signals recorded by at least two audio receivers at different spatial positions. The signal processor is adapted to process the received watermarked audio signals to obtain a receiver-specific information for each received watermarked audio signal. The receiver-specific information depends on the embedded watermarks embedded in the received watermarked audio signals. Moreover, the apparatus includes a direction information provider for providing direction information based on the receiver-specific information for each received watermarked audio signal.