Samsung Electronics Co Ltd v. Boomcloud 360 Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Samsung Electronics Co., Ltd. (Republic of Korea) and Samsung Electronics America, Inc. (New York)
  • Defendant: Boomcloud 360, Inc. (Delaware)
  • Plaintiff's Counsel: Fish & Richardson P.C.
• Case Identification: 3:26-cv-05019, S.D. Cal., 09/03/2026
• Venue Allegations: Venue is alleged to be proper in the Southern District of California because the defendant, Boomcloud, maintains a place of business in Encinitas, California, within the district, and because substantial events related to the dispute, including the ownership and enforcement of the patents-in-suit, occurred in the district.
• Core Dispute: Plaintiffs seek a declaratory judgment that their consumer electronics products do not infringe three of Defendant's patents related to spatial audio enhancement and crosstalk cancellation technology.
• Technical Context: The technology at issue involves digital signal processing methods to create a more immersive, three-dimensional audio experience and to correct for audio distortions in stereo speaker systems.
• Key Procedural History: This declaratory judgment action follows a series of patent infringement lawsuits filed by Boomcloud against Samsung's customers, including AT&T, T-Mobile, Walmart, Target, and Best Buy. In those cases, Boomcloud alleged that various Samsung smartphones, tablets, and audio accessories infringe the patents-in-suit. Boomcloud served infringement contentions with claim charts against Samsung products in at least two of the prior cases.

Case Timeline

Date	Event
2016-01-18	Earliest Priority Date for '564 Patent
2017-07-11	Priority Date for '820 Patent
2017-11-29	Earliest Priority Date for '527 Patent
2019-06-04	'820 Patent Issued
2020-07-21	'564 Patent Issued
2020-08-25	'527 Patent Issued
2026-01-30	Boomcloud files "Carrier Cases" against AT&T and T-Mobile
2026-03-19	Boomcloud serves Infringement Contentions in Carrier Cases
2026-06-17	Boomcloud files "Retailer Cases" against Walmart, Target, and Best Buy
2026-08-05	Apple Inc. files declaratory judgment action against Boomcloud
2026-08-18	Google LLC files declaratory judgment action against Boomcloud
2026-09-03	Samsung files present Complaint for Declaratory Judgment

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 10,313,820 - "Sub-Band Spatial Audio Enhancement"

The Invention Explained

• Problem Addressed: The patent addresses the general field of stereophonic sound reproduction, which aims to create a spatial sense for a listener from a stereo signal ʼ820 Patent, col. 1:13-17 The implicit problem is that standard stereo signals can be enhanced to create a more immersive sound field.
• The Patented Solution: The invention processes a stereo audio signal (left and right input channels) by first separating it into a "spatial component" and a "nonspatial component" ʼ820 Patent, abstract The patent specifies that the spatial component includes the difference between the left and right channels (L-R), while the nonspatial component includes their sum (L+R) ʼ820 Patent, col. 4:38-41 The system then applies different sets of "subband gains" across various frequency bands to these two components to generate "enhanced" versions, which are then combined to create new left and right output channels ʼ820 Patent, FIG. 6
• Technical Importance: This mid/side (M/S) processing technique allows for independent manipulation of the stereo width (the "side" or spatial component) and the centered, mono-compatible information (the "mid" or nonspatial component), providing a powerful tool for audio engineers to adjust the perceived soundstage.

Key Claims at a Glance

• The complaint notes that Boomcloud has asserted claims 1-27 Compl. ¶35 The complaint quotes and analyzes independent method claim 1 Compl. ¶36
• Claim 1 (method) elements:
  • processing the left input channel and the right input channel into a spatial component and a nonspatial component, the spatial component including a difference between the channels and the nonspatial component including a sum of the channels;
  • applying first subband gains to subbands of the spatial component to generate an enhanced spatial component, which involves applying a first set of subband filters;
  • applying second subband gains to subbands of the nonspatial component to generate an enhanced nonspatial component, which involves applying a second set of subband filters; and
  • combining the enhanced spatial component and the enhanced nonspatial component into a left output channel and a right output channel.

U.S. Patent No. 10,721,564 - "Subband Spatial and Crosstalk Cancellation for Audio Reporoduction [sic]"

The Invention Explained

• Problem Addressed: The patent addresses "crosstalk interference" in stereo speaker systems, where sound from the left speaker is heard by the right ear and vice-versa ʼ564 Patent, col. 1:47-52 This interference can "hinder the listener... from determining the perceived spatial location of the imaginary sound source," diminishing the stereo effect ʼ564 Patent, col. 1:50-52
• The Patented Solution: The invention proposes a method to compensate for audio distortions that arise from crosstalk cancellation. The system first determines a "speaker parameter," such as the listening angle between the speakers ʼ564 Patent, claim 1 Based on this parameter, it generates a "compensation signal" designed to remove "estimated spectral defects" that would otherwise be introduced by the crosstalk cancellation process ʼ564 Patent, claim 1 This compensation signal is added to the original audio to create a "precompensated signal," which is then processed for crosstalk cancellation ʼ564 Patent, abstract ʼ564 Patent, FIG. 3
• Technical Importance: By pre-emptively correcting for artifacts, this technique aims to achieve the benefits of crosstalk cancellation (a wider soundstage) without the common side effect of introducing unwanted tonal changes or "spectral defects" to the audio.

Key Claims at a Glance

• The complaint notes that Boomcloud has asserted claims 1-21 Compl. ¶43 The complaint quotes and analyzes independent method claim 1 Compl. ¶44
• Claim 1 (method) elements:
  • determining a speaker parameter for the first speaker and the second speaker, the speaker parameter comprising a listening angle between the first and second speakers;
  • generating a compensation signal for a plurality of frequency bands of the audio signal, where the compensation signal removes estimated spectral defects... and is determined based on the speaker parameter;
  • precompensating the audio signal for the crosstalk cancellation by adding the compensation signal to the audio signal to generate a precompensated signal; and
  • performing the crosstalk cancellation on the precompensated signal based on the speaker parameter to generate a crosstalk cancelled audio signal.

U.S. Patent No. 10,757,527 - "Crosstalk Cancellation B-Chain"

• Technology Synopsis: The patent addresses asymmetries in the audio listening environment, such as a listener being off-center or the speakers themselves having different acoustic properties ('527 Patent, col. 1:31-50). The patented solution is a "b-chain processor" that determines these asymmetries in frequency response, time alignment, or signal level and corrects for them by applying equalization, delay, or gain to the audio channels, thereby restoring a balanced stereo image ('527 Patent, abstract; '527 Patent, claim 1).
• Asserted Claims: The complaint notes Boomcloud has asserted claims 1-30 Compl. ¶51
• Accused Features: Samsung's complaint alleges its products do not infringe because they do not apply N-band equalization, delay, or gain to adjust for any such asymmetry as required by the claims Compl. ¶53

III. The Accused Instrumentality

Product Identification

The accused instrumentalities are a wide range of Samsung consumer electronics, including numerous models from the Galaxy S, Note, Z Flip, Z Fold, and A series of smartphones and Tab series of tablets, as well as the Galaxy Buds line of audio accessories (collectively, the "Accused Samsung Products") Compl. ¶¶4-6 Compl. ¶10

Functionality and Market Context

The complaint identifies the accused functionality as Samsung's "spatial audio processing and '360 Audio' features" (Compl. ¶7; Compl. ¶15). Boomcloud's infringement contentions in prior litigation assert that these features, which can be enabled in the device settings, perform the patented methods Compl. ¶7 The complaint characterizes the Accused Samsung Products as a major part of Samsung's consumer electronics business, sold through the customers (AT&T, T-Mobile, Walmart, etc.) that Boomcloud has sued for infringement Compl. ¶¶2-3 Compl. ¶9 No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

As this is a complaint for declaratory judgment of non-infringement, the following tables summarize Samsung's stated reasons for non-infringement.

10,313,820 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Non-Infringing Functionality	Complaint Citation	Patent Citation
processing the left input channel and the right input channel into a spatial component and a nonspatial component...	Samsung alleges the Accused Samsung Products do not process left and right input channels into a spatial component and a nonspatial component.	¶37	col. 4:35-44
applying second subband gains to subbands of the nonspatial component to generate an enhanced nonspatial component...	Samsung alleges the Accused Samsung Products do not generate an enhanced nonspatial component by applying subband gains.	¶37	col. 5:6-14

10,721,564 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Non-Infringing Functionality	Complaint Citation	Patent Citation
determining a speaker parameter for the first speaker and the second speaker, the speaker parameter comprising a listening angle between the first and second speakers;	Samsung alleges the Accused Samsung Products do not determine a listening angle between first and second speakers.	¶45	col. 6:3-5
generating a compensation signal... the compensation signal removing estimated spectral defects... wherein the... compensation signal are determined based on the speaker parameter;	Samsung alleges the Accused Samsung Products do not generate a compensation signal or apply a filter to remove spectral defects from crosstalk cancellation.	¶45	col. 7:3-10
performing the crosstalk cancellation on the precompensated signal based on the speaker parameter...	Samsung alleges the Accused Samsung Products do not perform crosstalk cancellation based on a determined speaker parameter.	¶45	col. 13:45-48

Identified Points of Contention

• '820 Patent - Technical Question: The core of the dispute over the '820 patent appears to be factual and technical: do Samsung's "360 Audio" features in fact implement the specific mid/side (sum/difference) processing architecture required to create the claimed "spatial component" and "nonspatial component"? Samsung's denial suggests its technology may achieve a spatial effect through a different method Compl. ¶37
• '564 Patent - Technical Question: The dispute over the '564 patent centers on whether the accused products perform the specific dynamic steps of the claim. Samsung alleges its products do not "determine a listening angle" or "generate a compensation signal" based on such a determination Compl. ¶45 This raises the question of whether Samsung's crosstalk cancellation features use a fixed or pre-configured model rather than the adaptive process described in the patent.

V. Key Claim Terms for Construction

• Term: "spatial component" and "nonspatial component" ('820 Patent)
• Context and Importance: The construction of these terms is fundamental to the infringement analysis for the '820 patent. Claim 1 explicitly defines them based on the difference (L-R) and sum (L+R) of the input channels, respectively. The dispute will likely focus on whether any alternative method for separating stereo information, if used by Samsung, falls within the scope of this definition.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The patent repeatedly refers to the components as "spatial (or 'side')" and "nonspatial (or 'mid')" ʼ820 Patent, col. 4:35-38, which could be argued to encompass functionally similar M/S processing techniques, even if not mathematically identical to a simple L-R/L+R calculation.
  • Evidence for a Narrower Interpretation: Claim 1 is explicit: "the spatial component including a difference between the left input channel and the right input channel and the nonspatial component including a sum of the left input channel and the right input channel" ʼ820 Patent, col. 18:13-18 This language may support an argument that the claim is strictly limited to this precise mathematical implementation.
• Term: "determining a speaker parameter... comprising a listening angle" ('564 Patent)
• Context and Importance: Practitioners may focus on this term because its definition is critical to whether a static, pre-programmed system can infringe a claim that appears to require a dynamic or adaptive step. Samsung's denial that its products perform this step Compl. ¶45 suggests it will argue its products use fixed parameters, not a "determining" process.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification discusses that parameters can be "measured in real time, prior to, or during the pipeline processing" ʼ564 Patent, col. 3:10-12 One might argue that a one-time selection of a profile based on a device model constitutes "determining" the parameter "prior to" processing.
  • Evidence for a Narrower Interpretation: The specification describes various ways to actively ascertain the speaker angle, such as through user input, microphone analysis, or computer vision ʼ564 Patent, col. 5:6-25 This could support an argument that "determining" requires an active measurement or calculation, not simply the use of a pre-existing, fixed value for a given device configuration.

VI. Other Allegations

• Indirect Infringement: The complaint seeks a declaration of non-infringement for indirect infringement and asserts facts to counter such a claim. Samsung alleges that because its products do not directly infringe, there can be no underlying act of direct infringement to support an indirect infringement theory Compl. ¶38 Compl. ¶46 It further argues that Samsung has not acted with the specific intent required for induced infringement or the knowledge required for contributory infringement, and that the accused products have substantial non-infringing uses Compl. ¶32 Compl. ¶38

VII. Analyst's Conclusion: Key Questions for the Case

This declaratory judgment action will likely revolve around the specific technical implementation of Samsung's audio features compared to the methods recited in Boomcloud's patents. The central questions for the court appear to be:

1. A core technical question of operational equivalence: Do Samsung's "360 Audio" features operate by separating a stereo signal into the specific "spatial" (L-R) and "nonspatial" (L+R) components as required by the '820 patent, or do they achieve a similar spatial effect through a fundamentally different, non-infringing signal processing architecture?
2. An evidentiary question of process execution: What evidence will be presented to show whether the Accused Samsung Products perform the active step of "determining a speaker parameter comprising a listening angle" as claimed in the '564 patent, versus merely applying a pre-configured or fixed algorithm that does not adapt to such a parameter?
3. A definitional question of scope for the '527 patent: Can the claim requirement to "determine asymmetries" be met by a system that uses pre-loaded profiles for different device models, or does the term, in the context of the patent, require a system to actively measure or calculate asymmetries in real-time or near real-time for a specific listening position?