DCT

2:26-cv-00488

Boomcloud 360 Inc v. Best Buy Stores LP

Key Events

Amended Complaint

complaint Intelligence

I. Executive Summary and Procedural Information

Parties & Counsel:
- Plaintiff: Boomcloud 360, Inc. (Delaware)
- Defendant: Walmart, Inc. (Delaware)
- Plaintiff’s Counsel: Russ August & Kabat
Case Identification: 2:26-cv-00488, E.D. Tex., 09/14/2026
Venue Allegations: Plaintiff alleges venue is proper in the Eastern District of Texas because Defendant Walmart, Inc. is registered to do business in Texas, has regular and established places of business in the District, and has committed acts of infringement within the District. The complaint also notes that Walmart has not contested venue in prior patent infringement actions in the district.
Core Dispute: Plaintiff alleges that Defendant’s sale of various electronic devices with spatial audio capabilities infringes three patents related to audio signal processing, spatial enhancement, and crosstalk cancellation.
Technical Context: The technology at issue involves digital audio processing techniques designed to create a more immersive, three-dimensional sound experience from stereo speakers, particularly in non-ideal listening environments common with consumer electronics.
Key Procedural History: The complaint alleges that between May 2021 and April 2022, Plaintiff Boomcloud engaged in discussions with Walmart, which included providing a technical demonstration of its audio solutions and informing Walmart of its patent portfolio. Plaintiff asserts that Walmart did not finalize a licensing agreement. The complaint also states that Boomcloud's technology has been licensed by companies including Verizon, Boost Mobile, and Qualcomm.

Case Timeline

Date	Event
2016-01-18	Earliest Priority Date for ’564 Patent
2017-07-11	Earliest 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
2021-05-01	Start of alleged pre-suit discussions with Defendant
2022-04-30	End of alleged pre-suit discussions with Defendant
2026-09-14	Complaint Filed

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

U.S. Patent No. 10,721,564 - "Subband Spatial and Crosstalk Cancellation for Audio reporoduction" (Issued July 21, 2020)

The Invention Explained

Problem Addressed: The patent describes the problem of "crosstalk interference" in stereophonic sound, where sound from one speaker is perceived by the listener's opposite ear (e.g., left speaker sound reaching the right ear) ʼ564 Patent, col. 1:36-47 This interference can diminish the listener's ability to perceive the spatial location of sounds as intended ʼ564 Patent, col. 1:48-52
The Patented Solution: The invention proposes a multi-stage audio processing system to address crosstalk ʼ564 Patent, FIG. 3 First, it performs "subband spatial enhancement" by dividing the audio signal into different frequency bands and adjusting the energy of the spatial ("side") and nonspatial ("mid") components within each band ʼ564 Patent, col. 2:17-34 Second, it generates a "crosstalk compensation" signal to correct for spectral artifacts that would otherwise be introduced by the final cancellation step ʼ564 Patent, col. 6:8-16 These processed signals are then combined before a final "crosstalk cancellation" is performed, resulting in an output with improved spatial qualities and reduced interference ʼ564 Patent, col. 2:53-64
Technical Importance: This approach aims to create a more immersive listening experience by actively managing the artifacts of crosstalk cancellation, thereby improving the perceived spatiality of the audio output ʼ564 Patent, col. 2:61-64

Key Claims at a Glance

The complaint asserts claims 6 and 14 Compl. ¶18 Independent claim 14 is a non-transitory computer readable medium claim.
Essential elements of independent claim 14 include:
- Instructions that cause a processor to:
- determine one or more speaker parameters for a first speaker and a second speaker, the parameters comprising a listening angle;
- remove spectral defects of crosstalk processing applied to the audio signal based on applying a filter to the audio signal, the filter including a configuration determined based on the speaker parameters; and
- apply the crosstalk processing on the audio signal.
The complaint reserves the right to assert additional claims.

U.S. Patent No. 10,757,527 - "Crosstalk Cancellation B-Chain" (Issued August 25, 2020)

The Invention Explained

Problem Addressed: The patent addresses sonic asymmetries that arise from "sub-optimally configured" audio rendering systems ʼ527 Patent, col. 1:21-23 Such situations include a listener being positioned off-center from the ideal "sweet spot," speakers being at unequal distances from the listener, or the speakers themselves having mismatched frequency or amplitude characteristics ʼ527 Patent, col. 1:32-49
The Patented Solution: The patent discloses a "b-chain processor" designed to correct for these asymmetries ʼ527 Patent, abstract The system first determines asymmetries between the left and right speakers in terms of frequency response, time alignment, and signal level for a given listening position ʼ527 Patent, col. 2:1-4 It then generates corrected left and right output channels by applying a combination of N-band equalization, signal delay, and gain to a "spatially enhanced signal" to compensate for the identified imbalances ʼ527 Patent, col. 2:4-11
Technical Importance: This "b-chain" processing is intended to restore a near-ideal stereo image even in common non-ideal listening scenarios, such as with mobile devices or desktop computers where speaker placement and listener position are often asymmetrical ʼ527 Patent, col. 14:9-16

Key Claims at a Glance

The complaint asserts independent claims 1, 11, and 21 Compl. ¶30
Essential elements of independent claim 1 (a system claim) include:
- A processing circuitry configured to:
- determine asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position; and
- generate a left output channel and a right output channel by performing at least one of:
  - applying an N-band equalization to the input audio signal to adjust for the asymmetry in frequency response;
  - applying a delay to the input audio signal to adjust for the asymmetry in time alignment; or
  - applying a gain to the input audio signal to adjust for the asymmetry in the signal level.
The complaint reserves the right to assert additional claims.

Multi-Patent Capsule: U.S. Patent No. 10,313,820

Patent Identification: U.S. Patent No. 10,313,820, "Sub-band Spatial Audio Enhancement," issued June 4, 2019 Compl. ¶40
Technology Synopsis: The patent describes a method for enhancing stereo audio by first processing a signal into its "spatial" (difference) and "nonspatial" (sum) components ʼ820 Patent, col. 4:35-44 The system then applies distinct gains to different frequency "subbands" of these two components to create enhanced versions, which are subsequently recombined into a stereo output with an improved spatial feel ʼ820 Patent, abstract
Asserted Claims: The complaint asserts independent claims 1, 14, and 27 Compl. ¶42
Accused Features: The infringement allegation targets electronic devices supporting spatial audio, including various models from Samsung, Apple, Google, and others Compl. ¶41

III. The Accused Instrumentality

Product Identification: The complaint names a wide range of "electronic devices supporting spatial audio" as the "Accused Products" Compl. ¶17 These include numerous models of smartphones and tablets from Samsung (Galaxy S, Note, Z Flip/Fold, and Tab series), the Apple iPad Pro, the Google Pixel 10 Pro, the Motorola Edge (2025), and televisions from TCL and onn Compl. ¶17 Compl. ¶29 Compl. ¶41
Functionality and Market Context: The complaint alleges that these devices incorporate "spatial audio" functionality Compl. ¶17 The documents do not specify the technical implementation of this feature within the Accused Products. The commercial importance of the accused functionality is implied by the extensive list of popular, high-volume consumer electronics from major global manufacturers that allegedly incorporate it Compl. ¶17 Compl. ¶29 Compl. ¶41

No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint alleges that the Accused Products infringe the asserted patents but does not provide claim charts or a detailed element-by-element mapping of the infringement theory in the body of the complaint. Instead, it incorporates by reference external exhibits (Exhibits 2, 4, and 6) which were not attached to the filed document Compl. ¶18 Compl. ¶30 Compl. ¶42 Without these exhibits, a detailed analysis of the specific infringement allegations is not possible.

Identified Points of Contention: Based on the claim language and the general allegations, several points of contention may arise:
- For the ’564 Patent: An evidentiary question will be whether the "spatial audio" feature of the Accused Products performs the specific function of removing spectral defects of crosstalk processing as required by claim 14. This suggests a need to prove not only that the devices perform crosstalk cancellation, but that they also execute a distinct, parameter-based filtering step to correct for artifacts created by that cancellation process.
- For the ’527 Patent: The infringement analysis will likely focus on whether the Accused Products determine asymmetries between speakers in frequency, time, or signal level, and then apply a specific correction (EQ, delay, or gain) as required by claim 1. A key question is whether the devices' "spatial audio" processing includes this dynamic or configuration-dependent assessment and correction, or if it is a more static algorithm that does not account for such asymmetries.

V. Key Claim Terms for Construction

For the ’564 Patent

The Term: "remove spectral defects of crosstalk processing"
Context and Importance: This phrase from independent claim 14 defines the core corrective action of the invention. The viability of the infringement claim may depend on whether the accused devices' filtering can be characterized as removing defects specifically caused by crosstalk processing, rather than performing general audio equalization.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: A party might argue that any filter applied in a system that also performs crosstalk cancellation, and which results in a subjectively better sound, is inherently "removing defects."
- Evidence for a Narrower Interpretation: The specification describes this step as compensating for "artifacts resulting from a crosstalk cancellation" ʼ564 Patent, col. 7:29-32 This language may support an interpretation that the claim requires identifying a specific "defect" caused by the cancellation process and applying a filter targeted at that artifact, not just general-purpose filtering.

For the ’527 Patent

The Term: "determine asymmetries between the left speaker and the right speaker"
Context and Importance: This term from independent claim 1 is the predicate for the claimed corrective actions (equalization, delay, gain). The infringement question may turn on what actions constitute "determining" an asymmetry.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: A party could argue that using pre-set profiles for different device models or orientations, which account for known physical asymmetries, constitutes a "determination" of those asymmetries.
- Evidence for a Narrower Interpretation: The specification discusses adjusting the audio "according to a change in the listening position" ʼ527 Patent, col. 2:20-22 and mentions using a camera or sensor to "determine the location of the listener's head" ʼ527 Patent, col. 16:6-13 This could support a narrower construction requiring an active or dynamic sensing of the listening environment to "determine" asymmetries, rather than relying on static, pre-loaded configurations.

VI. Other Allegations

Indirect Infringement: The complaint alleges induced infringement for all three patents, asserting that Walmart actively encourages and instructs customers to use the infringing "spatial audio" features through user manuals, instruction materials on its website, and other customer-facing documentation Compl. ¶19 Compl. ¶31 Compl. ¶43
Willful Infringement: Willfulness is alleged for all three patents. The complaint bases this on two grounds: alleged pre-suit knowledge stemming from licensing discussions and a technical demonstration that occurred between May 2021 and April 2022 Compl. ¶5 Compl. ¶21 Compl. ¶33 Compl. ¶45, and post-suit knowledge from at least the filing of the original complaint in the action Compl. ¶21 Compl. ¶33 Compl. ¶45

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

An Evidentiary Question of Technical Function: As the complaint lacks specific claim charts, a central issue will be evidentiary. What technical proof will the Plaintiff offer to demonstrate that the generalized "spatial audio" features found across a wide array of accused products perform the specific, multi-step processes mandated by the patents, such as the "defect removal" of the ’564 patent and the "asymmetry determination" of the ’527 patent?
A Definitional Question of Claim Scope: The case may turn on the construction of key claim terms. For the ’527 patent, does the term "determine asymmetries" require active, real-time sensing of the listening environment, as suggested by parts of the specification, or can it be met by using pre-configured hardware profiles? Similarly, for the ’564 patent, can "remove spectral defects" be read to cover any general equalization in a system with crosstalk cancellation, or does it require a more specific process of identifying and correcting artifacts that are a direct result of that cancellation?
A Question of Knowledge and Intent: Given the allegations of pre-suit discussions and a technical demonstration Compl. ¶5, a key factual dispute will likely concern the content of those communications and what level of knowledge about Boomcloud's specific patented technology can be imputed to Walmart, which will be central to the claim for willful infringement.