Boomcloud 360 Inc v. Walmart Inc

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: 1:26-cv-00245, E.D. Tex., 06/17/2026
• Venue Allegations: Plaintiff alleges venue is proper in the Eastern District of Texas because Defendant Walmart maintains regular and established places of business in the district, has transacted business in the district, and has allegedly committed acts of patent infringement there.
• Core Dispute: Plaintiff alleges that Defendant's sale of certain Samsung electronic devices infringes three patents related to digital audio processing for spatial audio enhancement and crosstalk cancellation.
• Technical Context: The technology involves digital signal processing methods designed to improve the perceived width and realism of a stereo sound field produced by speakers, a significant feature in consumer electronics.
• Key Procedural History: The complaint alleges that Plaintiff and Defendant engaged in licensing discussions between May 2021 and April 2022, which included Plaintiff providing Defendant with a demonstration tablet featuring its audio technology, but the parties did not reach a licensing agreement. Plaintiff also notes its technology has been licensed by other major companies, including Verizon, Boost Mobile, and Qualcomm.

Case Timeline

Date	Event
2016-01-18	'564 Patent Priority Date
2017-07-11	'820 Patent Priority Date
2017-11-29	'527 Patent Priority Date
2019-06-04	'820 Patent Issue Date
2020-07-21	'564 Patent Issue Date
2020-08-25	'527 Patent Issue Date
2021-05-01	Approximate start of licensing discussions between Plaintiff and Defendant
2022-04-30	Approximate end of licensing discussions between Plaintiff and Defendant
2026-06-17	Complaint Filing Date

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

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

The Invention Explained

• Problem Addressed: The patent addresses the problem of "crosstalk interference" in stereophonic sound reproduction, where sound from each speaker reaches both of the listener's ears, which can degrade the perception of the audio's spatial location and realism '564 Patent, col. 1:40-52
• The Patented Solution: The invention proposes a multi-stage audio processing system. First, a "sound field enhancement processing pipeline" preprocesses the audio, often by separating it into frequency subbands and adjusting its spatial ("side") and non-spatial ("mid") components to widen the soundstage '564 Patent, col. 2:4-19 Second, a "crosstalk cancellation processing pipeline" modifies this enhanced signal to cancel out the contralateral sound waves (e.g., sound from the left speaker reaching the right ear), based on speaker parameters '564 Patent, abstract '564 Patent, col. 2:36-54 The overall process is depicted in the flowchart of Figure 3 '564 Patent, FIG. 3
• Technical Importance: This combined approach of spatial enhancement followed by adaptive crosstalk cancellation aimed to create a more immersive and precisely located audio experience from standard speaker configurations, a key differentiator for consumer devices '564 Patent, col. 3:25-30

Key Claims at a Glance

• The complaint asserts independent method claim 6 Compl. ¶18
• Claim 6 requires the steps of:
  • determining one or more speaker parameters for the first speaker and the second speaker, the speaker parameter comprising a listening angle between the first and second speakers;
  • removing 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 one or more speaker parameters; and
  • applying the crosstalk processing on the audio signal.
• The complaint does not explicitly reserve the right to assert dependent claims.

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

The Invention Explained

• Problem Addressed: The patent identifies that real-world listening environments are rarely ideal. Asymmetries, such as a listener being off-center, speakers being at different distances, or speakers having mismatched frequency responses, can degrade or collapse the stereo image created by audio processing '527 Patent, col. 1:21-50
• The Patented Solution: The invention discloses a "b-chain processor" that compensates for such real-world asymmetries. It determines asymmetries in frequency response, time alignment, and signal level between the speakers relative to a listening position. It then generates a corrected output by applying N-band equalization, a time delay, and/or gain to one or both audio channels to restore a balanced and stable stereo image '527 Patent, abstract '527 Patent, col. 2:1-11 Figure 7 provides a block diagram of the b-chain processor's components '527 Patent, FIG. 7
• Technical Importance: This technology allows for robust spatial audio performance in the non-ideal, variable conditions common in consumer settings (e.g., listening on a laptop or mobile device), making the advanced audio effects more reliable '527 Patent, col. 3:56-64

Key Claims at a Glance

• The complaint asserts independent method claim 21 Compl. ¶30
• Claim 21 requires the steps of:
  • determining asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position; and
  • generating a left output channel and a right output channel by performing at least one of: applying an N-band equalization to adjust for frequency response asymmetry; applying a delay to adjust for time alignment asymmetry; or applying a gain to adjust for signal level asymmetry.
• The complaint does not explicitly reserve the right to assert dependent claims.

U.S. Patent No. 10,313,820 - "Sub-Band Spatial Audio Enhancement" (issued June 4, 2019)

• Technology Synopsis: The patent describes a method for enhancing stereo audio by first processing the left and right input channels into a "spatial component" (difference signal) and a "nonspatial component" (sum signal) '820 Patent, col. 4:35-44 The system then applies distinct gains to various frequency subbands of these two components before recombining them, allowing for targeted enhancement of the audio's spatial characteristics '820 Patent, abstract '820 Patent, col. 1:20-29
• Asserted Claims: The complaint asserts independent method claim 1 Compl. ¶42
• Accused Features: The complaint accuses the general "spatial audio" functionality of the Accused Products of infringing the '820 Patent Compl. ¶41

III. The Accused Instrumentality

Product Identification

The complaint names a wide range of Samsung-branded consumer electronics, including various models of the Galaxy Tab, Galaxy S-series phones, Galaxy Note phones, Galaxy Z Flip and Z Fold phones, and Galaxy Buds audio accessories (collectively, the "Accused Products") Compl. ¶17 Compl. ¶29 Compl. ¶41

Functionality and Market Context

The complaint alleges that the Accused Products are "electronic devices supporting spatial audio" Compl. ¶17 This functionality is the basis of the infringement allegations. The complaint does not provide a technical breakdown of how Samsung's spatial audio feature operates, but implies it performs the functions described in the asserted patents. The products are mass-market devices sold by Defendant Walmart Compl. ¶8 The complaint frames the underlying technology as valuable, noting that Plaintiff has licensed its portfolio to other major technology and telecommunications companies Compl. ¶3 No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint incorporates by reference claim chart exhibits that were not attached to the publicly filed document Compl. ¶18 Compl. ¶30 Compl. ¶42 The following analysis is based on the narrative allegations in the complaint and the language of the asserted patents.

'564 Patent Infringement Allegations

Claim Element (from Independent Claim 6)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
determining one or more speaker parameters for the first speaker and the second speaker, the speaker parameter comprising a listening angle between the first and second speakers;	The complaint alleges that the Accused Products' spatial audio systems practice the claimed method, which suggests they determine or account for speaker geometry to enable crosstalk cancellation.	¶18	col. 5:1-14
removing 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 one or more speaker parameters;	This corresponds to the "crosstalk compensation" function, which the complaint alleges the Accused Products perform to correct for audible artifacts created by crosstalk cancellation processing.	¶18	col. 7:27-44
and applying the crosstalk processing on the audio signal.	This is the core crosstalk cancellation step, which the complaint alleges the Accused Products' spatial audio feature performs to create an immersive sound experience.	¶18	col. 7:62-8:2

• Identified Points of Contention:
  • Scope Question: A potential dispute may arise over the term "determining." The infringement analysis will question whether the Accused Products actively measure or receive input regarding the "listening angle" in real-time, or if they rely on pre-configured, generic parameters for typical use cases, and whether the latter meets the claim limitation.
  • Technical Question: A key evidentiary question will be whether the Accused Products perform the claimed two-part process of first "removing spectral defects" (compensation) and then separately "applying the crosstalk processing" (cancellation), or if they use a different, integrated technique.

'527 Patent Infringement Allegations

Claim Element (from Independent Claim 21)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
determine asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position;	The complaint alleges that the Accused Products' spatial audio functionality must account for real-world asymmetries to provide a stable stereo image, particularly on mobile devices where the listener's position is variable.	¶30	col. 2:1-4
and generating a left output channel...and a right output channel...by at least one of: applying an N-band equalization...applying a delay...or applying a gain...	The complaint's allegation suggests that the Accused Products use one or more of these specific correction techniques (EQ, delay, gain) to compensate for the determined asymmetries as part of their spatial audio feature.	¶30	col. 14:1-12

• Identified Points of Contention:
  • Technical Question: The infringement analysis will raise the question of what evidence demonstrates that the Accused Products "determine asymmetries" across all three recited categories: frequency response, time alignment, and signal level. Proving the "determine" step for each may be a focus.
  • Scope Question: A dispute may center on whether the processing in the accused devices constitutes "N-band equalization" as understood in the patent, or if it is a different form of filtering that falls outside the claim's scope.

V. Key Claim Terms for Construction

• Term: "determining... speaker parameters" ('564 Patent, Claim 6)

  • Context and Importance: The interpretation of "determining" is critical. If it requires active, real-time measurement of the listening environment, infringement may be more difficult to prove for a mass-market consumer device. If it can be satisfied by using pre-programmed profiles or defaults, the claim scope is broader. Practitioners may focus on this term because the patent describes both active measurement and the use of predefined values.
  • Intrinsic Evidence for a Broader Interpretation: The specification states that speaker parameters "can be predefined or measured in real time," which may support an argument that using a stored profile for a device type satisfies the limitation '564 Patent, col. 5:5-6
  • Intrinsic Evidence for a Narrower Interpretation: The specification provides numerous examples of active determination, such as user input of speaker angle, analysis of microphone signals, or data from gyroscopes and accelerometers, which may support an argument that an active step is required '564 Patent, col. 5:6-24

• Term: "determine asymmetries" ('527 Patent, Claim 21)

  • Context and Importance: This term is central because infringement requires a finding that the accused system "determines" asymmetries in three distinct areas (frequency, time, level). The dispute will likely focus on what actions constitute "determining" and whether the Accused Products perform it for all three.
  • Intrinsic Evidence for a Broader Interpretation: The patent's summary suggests the system adjusts for known device characteristics, which could be interpreted broadly to include accounting for typical asymmetries in a product's design without active measurement ('527 Patent, col. 2:1-4).
  • Intrinsic Evidence for a Narrower Interpretation: The detailed description focuses on correcting for a listener's non-ideal position, and the "b-chain processor" is described as adjusting for differences in time delay, signal level, and frequency response that arise from that position '527 Patent, col. 13:20-31 This context suggests an active process tied to a specific listening scenario.

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement, stating that Defendant provides "user manuals and instruction materials" that instruct and encourage customers to use the accused spatial audio features in an infringing manner Compl. ¶19 Compl. ¶31 Compl. ¶43 It also pleads contributory infringement, alleging the Accused Products are especially made for infringement and are not staple articles of commerce Compl. ¶20 Compl. ¶32 Compl. ¶44
• Willful Infringement: Willfulness is alleged based on pre-suit knowledge. The complaint asserts that Defendant learned of the Asserted Patents and their relevance to spatial audio during licensing discussions with Plaintiff from May 2021 to April 2022, which included a technical demonstration, and that Defendant's alleged infringement continued in conscious disregard of Plaintiff's patent rights Compl. ¶5 Compl. ¶6 Compl. ¶21 Compl. ¶33 Compl. ¶45

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

1. An Evidentiary Question of Operation: A primary challenge for the plaintiff will be to prove, likely through reverse engineering or expert testimony, that the accused "spatial audio" features operate according to the specific, multi-step processes recited in the claims. For example, does the functionality in the Samsung devices truly perform crosstalk "compensation" separate from "cancellation" ('564 patent), and does it "determine" and correct for all three distinct types of "asymmetries" ('527 patent)?

2. A Definitional Question of Scope: The case may turn on the construction of key verbs like "determining." A central legal question will be whether this term requires an active, real-time measurement of the listening environment, as detailed in the patents' embodiments, or if it can be satisfied by the use of pre-configured device profiles, which are common in consumer electronics.

3. A Factual Question of Willfulness: Given the complaint's detailed allegations of pre-suit licensing negotiations and a technical demonstration, a crucial question for trial will be whether Defendant's alleged infringement was willful. The outcome will depend on the specific content of those communications and could significantly impact potential damages.