Verance Corporation

Other

Allot Communications Ltd.

Ortiva Wireless, Inc.

Douglas Wong

Chong U Lee

Rade Petrovic

Joseph M Winograd

Babak B Tehranchi

Sujit Dey

Parag Arole

Jiangtao Wen

Debashis Panigrahi

Yusuke Takebuchi

Debashi Panigrahi

Methods and devices are provided for reducing perceptible artifacts in a host content when the host contend is embedded with watermarks. In one method, a first segment of a host content that includes a first logical value is obtained. A second segment of the host content that includes a second logical embedded therein is also obtained. The second logical value is different from the first logical value, and the second segment is adjacent to the first segment of the host content. The host content at a boundary location of the first and the second segments is modified according to a transition function to suppress transitions in the host content at the boundary location caused by the different logical values embedded in the first and the second segments of the host content.

Pre-processed information embedding system

Methods and devices are provided for embedding auxiliary information in a host content in a manner that reduces memory, bandwidth and computational complexity of the embedding and transmission systems. One methodology relates to receiving a set of watermark embedding parameters produced at a pre-processing node by pre-processing the host content. The watermark embedding parameters enable embedding each of a plurality of host content segments with any one of at least two different logical values. To embed the auxiliary information, the host content is modified on a segment-by-segment basis using the set of watermark embedding parameters and in accordance with a control signal that designates one of the at least two logical values for embedding into a selected segment of the host content. The generation of watermark embedding parameters at a pre-processing node reduces storage, transmission and computational complexity of embedding operations that can occur at locations other than the pre-processing node.

A method and system are provided for wireless multimedia customization for different access networks with variable network conditions and device types. In one aspect, when a multimedia content clip is available, the clip is processed for transport by processing it in accordance with different options for the content clip in an optimized way that helps dynamic customization. For example, instead of preparing a version of the entire content clip, targeted for a particular network condition and target device characteristics, or creating a separate processed clip for each compression parameter available, a set of content ingredients are generated that can address a wide range of network conditions even through dynamic fluctuations in conditions and device characteristics.

Network adaptation of digital content

Methods are provided for embedding auxiliary information in a host content signal which reduce the memory, bandwidth and computational complexity of the embedding and transmission systems. In one embodiment, a first reduced-scale signal is produced which corresponds to the host content embedded with a first logical value and producing a second reduced-scale signal corresponding to the host content embedded with a second logical value. A first set of segments from the first reduced-scale signal may be combined with a second set of segments from the second reduced-scale signal in a pre-defined manner to produce a composite embedded host content. Thus the storage and transmission requirements of the watermarking system are reduced to having to deal with only the original content plus two reduced-scale signals.

Auxiliary information () representing binary or multi-level (M&#x2267;2) logical values is embedded into successive segments () of an audio, video or other data signal in response to a user request to download the data signal via an on-line distributor () on a computer network such as the Internet. To avoid unnecessary delays in providing the data signal to the user, the data signal is pre-processed to provide two sets or copies of data (). One set () of the data contains segments with an embedded binary '0', while the other set () contains corresponding segments with an embedded binary '1'. Successive segments are selected from one of the two sets to provide a time-multiplexed composite data signal () that has the desired content, but with an embedded binary data sequence that identifies the user.

Network transmission of live digital content from sources to receiving devices is enabled with real-time encoding, customization, and transmission of the live content according to user preferences, receiving device characteristics, network conditions and the like. Content, such as advertising customized to user profile and user location, may be conveniently inserted into the live content. Source-to-screen delay from sources to receiving devices is reduced and channel switching is supported.

Digital content buffer for adaptive streaming

An oversampled filter bank structure that can be implemented using popular and efficient fast filter banks to allow subband processing of an input signal with substantially reduced aliasing between subbands. Even subbands (SB, SB, SB, . . . ) of an input signal (x(n)) are frequency-shifted () prior to analysis filtering () at a 2&#xd7; oversampled filter bank, subband processing (), and synthesis filtering (). A subsequent frequency-shift () returns the even subbands to their original band positions. The odd subbands (SB, SB, SB, . . . ) are delayed () to compensate for the processing time of the frequency shifting. Separate analysis (') and synthesis (&#x2032;) filter banks may be provided for the even and odd subbands, or common complex analysis () and synthesis () filter banks may be used. In another embodiment, the subbands are processed in four subband paths (Paths), and&#xd7; oversampling is used. A filter bank structure () for 2-D data is also provided.

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San Diego, CA, United States of America

Douglas Wong