Prior art

Analysis of Prior Art for U.S. Patent 12,231,703

As a technical patent analyst on April 26, 2026, I have reviewed the citations listed for U.S. Patent 12,231,703 to identify the most relevant prior art. The following analysis details key references and their potential impact on the patent's claims under 35 U.S.C. § 102, which pertains to novelty.

The core invention of patent 12,231,703 is a method and system for reducing latency when a user switches between content streams on a digital receiver. This is achieved by:

1. Maintaining the bitrate of the previous content stream for the new stream.
2. Preserving all or part of the existing "playback pipeline" (source element, demultiplexer, audio/video decoders) if the new content is of the same type and uses compatible codecs.

Below is an examination of prior art references that could be considered to anticipate these claims.

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Key Prior Art and Potential Anticipation of Claims

1. U.S. Patent Application Publication No. US 2013/0329354 A1

• Full Citation: Systems and methods for achieving optimal digital video channel change performance. Publication No. US 2013/0329354 A1.
• Publication Date: December 30, 2010 (filed June 29, 2009).
• Brief Description: This application describes a method for reducing channel change times in a digital video system. It discloses pre-tuning to a new channel and pre-building a media pipeline for the new content before the user finalizes the channel change. This includes allocating resources and initializing decoders in advance.
• Potential Anticipation: This reference appears to be highly relevant to the claims of patent 12,231,703, particularly independent claims 1, 11, and 20. The concept of preparing a playback pipeline for new content before it is selected is a core element of the '354 application. While it may not explicitly mention "preserving" the exact same pipeline components, the act of "pre-building" a pipeline for an anticipated content switch achieves a similar technical goal of reducing latency by avoiding the need to construct the pipeline from scratch after the switch. This could be argued to anticipate the novelty of determining whether to preserve the pipeline based on content type.

2. U.S. Patent No. 8,532,171 B1

• Full Citation: Multiple stream adaptive bit rate system. Patent No. US 8,532,171 B1.
• Publication Date: September 10, 2013 (filed December 23, 2010).
• Brief Description: This patent addresses adaptive bitrate streaming and describes a system that can manage multiple content streams simultaneously. It includes methods for switching between streams and managing the bitrate of those streams to ensure a smooth user experience.
• Potential Anticipation: This reference is relevant to the bitrate maintenance aspect of patent 12,231,703. Claim 6 of the patent, which depends on claim 1, specifies initiating playback of the new content using the bitrate from the previous content. The '171 patent's disclosure on managing bitrates across multiple streams could be interpreted as anticipating this specific step, as managing a switch between streams would inherently involve decisions about the initial bitrate of the new stream. An argument could be made that using the previous bitrate is an obvious starting point in an adaptive bitrate system.

3. U.S. Patent Application Publication No. US 2011/0296047 A1

• Full Citation: Method and apparatus for seamless playback of media. Publication No. US 2011/0296047 A1.
• Publication Date: December 1, 2011 (filed June 1, 2010).
• Brief Description: This application focuses on achieving seamless playback when switching between different media items. It describes a method where a media player can prepare for the playback of a subsequent media item while the current one is still playing. This includes pre-buffering data and preparing the necessary playback resources.
• Potential Anticipation: Similar to the '354 application, this reference teaches the concept of preparing for a content switch in advance to reduce delays. It directly addresses the problem of "seamless playback," which is the stated goal of patent 12,231,703. The '047 application's disclosure of preparing playback resources beforehand could be seen as anticipating the core idea of preserving or pre-building the playback pipeline as claimed in claims 1, 11, and 20 of the patent in question.

4. U.S. Patent Application Publication No. US 2004/0111526 A1

• Full Citation: Compositing MPEG video streams for combined image display. Publication No. US 2004/0111526 A1.
• Publication Date: June 10, 2004 (filed December 10, 2002).
• Brief Description: This application, though older, discusses the handling of multiple MPEG video streams. It describes a system that can decode and composite multiple streams, which requires managing multiple decoding pipelines.
• Potential Anticipation: While focused on displaying multiple streams at once rather than switching between them, the underlying technology for managing multiple decoder instances is relevant. An argument could be made that the knowledge of how to efficiently manage resources for multiple video streams was well-established by this reference. This could potentially render the concept of reusing a decoder pipeline for a new stream of the same type obvious to a person skilled in the art, thereby challenging the non-obviousness of the invention in patent 12,231,703, even if not directly anticipating it under § 102.

In summary, several prior art references disclose key elements of the invention claimed in U.S. Patent 12,231,703. The '354 and '047 applications, in particular, describe methods for pre-building or preparing playback resources to achieve faster content switching, which closely aligns with the concept of pipeline preservation. The '171 patent addresses adaptive bitrate management in a way that could anticipate the specific claim of maintaining the previous bitrate. These references would likely form the basis of any challenge to the novelty of the claims in patent 12,231,703.