Google LLC v. Boomcloud 360 Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Google LLC (Delaware)
  • Defendant: Boomcloud 360, Inc. (Delaware)
  • Plaintiff's Counsel: Arnold & Porter Kaye Scholer LLP
• Case Identification: 3:26-cv-08573, N.D. Cal., 08/18/2026
• Venue Allegations: Plaintiff Google LLC asserts that venue is proper in the Northern District of California because a substantial part of the events, including the sale, design, and development of the accused products, occurred in the district. It is also alleged that Defendant Boomcloud 360, Inc. is subject to personal jurisdiction in the district, maintains a corporate mailing address there, and has directed patent enforcement activities at Google within the district.
• Core Dispute: Plaintiff seeks a declaratory judgment that its Google Pixel smartphones and Pixel Buds audio accessories 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 techniques designed to improve the stereo listening experience by creating a wider, more immersive soundstage and correcting for audio artifacts.
• Key Procedural History: This declaratory judgment action was filed after the patent holder, Boomcloud, initiated patent infringement lawsuits in the Eastern District of Texas against several of Google's customers and partners, including AT&T, T-Mobile, Best Buy, and Walmart. In those underlying lawsuits, Boomcloud served infringement contentions explicitly accusing Google's products. Boomcloud also served subpoenas on Google related to the accused products, creating what Google alleges is a justiciable controversy.

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
2026-01-30	Boomcloud files Texas Lawsuits vs. AT&T, T-Mobile
2026-03-19	Boomcloud serves infringement contentions
2026-06-17	Boomcloud files lawsuits vs. Best Buy, etc.
2026-07-13	Boomcloud serves subpoenas on Google
2026-08-18	Complaint for Declaratory Judgment Filed

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

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

• Patent Identification: U.S. Patent No. 10,313,820, "Sub-band Spatial Audio Enhancement," issued June 4, 2019. Compl. ¶19

The Invention Explained

• Problem Addressed: The patent's background section describes the goal of stereo audio reproduction, which is to create the perception of sound coming from imaginary sources, or "spatial images," that may be located between or beyond the physical speakers. '820 Patent, col. 1:21-41
• The Patented Solution: The invention enhances a stereo audio signal by first processing it into a "spatial" component (representing the difference between left and right channels) and a "nonspatial" component (representing the sum of the channels). '820 Patent, abstract It then divides these components into multiple frequency subbands and applies different gains or delays to each subband independently before recombining them into the final left and right output channels. '820 Patent, col. 2:30-44 '820 Patent, FIG. 6 This process allows for frequency-specific manipulation of the stereo width.
• Technical Importance: This subband-based approach allows for more granular control over the stereo sound field than traditional methods, potentially enhancing immersion without introducing undesirable audio artifacts across the entire frequency spectrum. '820 Patent, col. 2:5-9

Key Claims at a Glance

• The complaint states that Boomcloud has asserted claims 1-27 of the '820 Patent. Compl. ¶24 Independent claim 1 is identified as representative. Compl. ¶26
• The essential elements of independent claim 1 include:
  • processing the left input channel and the right input channel into a spatial component (difference) and a nonspatial component (sum);
  • applying first subband gains to subbands of the spatial component to generate an enhanced spatial component, wherein this involves applying a first set of subband filters;
  • applying second subband gains to subbands of the nonspatial component to generate an enhanced nonspatial component, wherein this 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. Compl. ¶25
• The complaint notes that independent system claim 14 and computer-readable medium claim 27 recite similar elements. Compl. ¶26

U.S. Patent No. 10,721,564 - "Subband Spatial and Crosstalk Cancellation for Audio Reproduction"

• Patent Identification: U.S. Patent No. 10,721,564, "Subband Spatial and Crosstalk Cancellation for Audio Reproduction," issued July 21, 2020. Compl. ¶20

The Invention Explained

• Problem Addressed: The patent addresses crosstalk interference in stereo audio, which occurs when sound from one speaker reaches the listener's opposite ear (e.g., left speaker to right ear), hindering the listener's ability to perceive the spatial location of sounds. '564 Patent, col. 1:37-53 This effect can diminish the perceived width and immersion of the audio.
• The Patented Solution: The invention proposes a method that pre-compensates an audio signal to counteract the negative effects of crosstalk cancellation. It involves determining a "speaker parameter" such as the listening angle, then generating a "compensation signal" designed to remove "estimated spectral defects" that the cancellation process itself would introduce. '564 Patent, abstract This compensation signal is added to the audio signal to create a "precompensated signal," which is then processed by a crosstalk canceller. '564 Patent, col. 2:35-51
• Technical Importance: This method aims to improve the perceptual quality of crosstalk cancellation by proactively correcting for audio coloration (spectral defects) that can result from standard cancellation techniques, thereby creating a more stable and immersive listening experience. '564 Patent, col. 3:10-27

Key Claims at a Glance

• The complaint states that Boomcloud has asserted claims 1-21 of the '564 Patent. Compl. ¶32 Independent claim 1 is identified as representative. Compl. ¶34
• The essential elements of independent claim 1 include:
  • 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, which removes estimated spectral defects from crosstalk cancellation;
  • 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. Compl. ¶33
• The complaint notes that independent method claim 6 and computer-readable medium claim 14 recite similar elements. Compl. ¶34

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

• Patent Identification: U.S. Patent No. 10,757,527, "Crosstalk Cancellation B-chain," issued August 25, 2020. Compl. ¶21
• Technology Synopsis: The patent addresses physical and geometric asymmetries in audio playback environments, such as a listener being off-center or the speakers having mismatched frequency responses. '527 Patent, col. 1:21-53 The invention proposes a "b-chain" processor that determines these asymmetries and compensates for them by applying specific N-band equalization, delay, or gain to the audio channels, thereby creating a balanced audio image. '527 Patent, abstract '527 Patent, col. 2:2-11
• Asserted Claims: Claims 1-30 are asserted. Compl. ¶40 Independent claim 1 is identified as representative. Compl. ¶42
• Accused Features: The complaint alleges that the "spatial audio functionality" of Google's products is accused of infringement. Compl. ¶3 Google denies infringement, stating its products do not "determine asymmetries between the left speaker and the right speaker in frequency response, time alignment, and signal level for a listening position" or apply adjustments for such asymmetries as claimed. Compl. ¶¶42-43

III. The Accused Instrumentality

Product Identification

The accused instrumentalities are various Google products, including the "Google Pixel 6, Pixel 6 Pro, Pixel 7, Pixel 7 Pro, Pixel 8, Pixel 8 Pro, Pixel 9, Pixel 9 Pro, Pixel 9 Pro Fold, Pixel 9 Pro XL, Pixel Fold, Pixel 10, Pixel 10 Pro, Pixel 10 Pro Fold, and Pixel 10 Pro XL alone or in combinations with audio accessories including Google Pixel Buds 2a, Google Pixel Buds Pro, and Google Pixel Buds Pro 2". Compl. ¶3 These are collectively referred to as the "Accused Google Products". Compl. ¶3

Functionality and Market Context

• The complaint identifies the "spatial audio functionality" of the Accused Google Products as the feature accused of infringement. Compl. ¶3
• In its prayer for declaratory judgment of non-infringement, Google alleges that its products do not perform key steps of the asserted claims. For the '820 Patent, it is alleged the products "do not process input channels into spatial and nonspatial components as required". Compl. ¶26 For the '564 Patent, it is alleged the products "do not determine a listening angle... for the purpose of performing crosstalk cancellation". Compl. ¶34 For the '527 Patent, it is alleged the products "do not determine asymmetries in frequency response, time alignment, and signal level". Compl. ¶42

No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

10,313,820 Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality (as denied by Google)	Complaint Citation	Patent Citation
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 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;	The complaint alleges that the Accused Google Products "do not process input channels into spatial and nonspatial components as required by the '820 patent claims."	¶26	col. 4:35-44
applying first subband gains to subbands of the spatial component to generate an enhanced spatial component, wherein applying the first subband gains to the subbands of the spatial component includes applying a first set of subband filters to the spatial component;	The complaint alleges Google does not perform the step of "applying first subband gains to subbands of the spatial component to generate an enhanced spatial component."	¶26	col. 5:3-12
applying second subband gains to subbands of the nonspatial component to generate an enhanced nonspatial component, wherein applying the second subband gains to the subbands of the nonspatial component includes applying a second set of subband filters to the nonspatial component; and	The complaint alleges Google does not perform the step of "applying second subband gains to subbands of the nonspatial component to generate an enhanced nonspatial component."	¶26	col. 5:3-12
combining the enhanced spatial component and the enhanced nonspatial component into a left output channel and a right output channel.	The complaint alleges Google does not perform the step of "combining the enhanced spatial component and the enhanced nonspatial component."	¶26	col. 5:47-64

• Identified Points of Contention:
  • Factual Question: The primary dispute appears to be factual: do the Accused Google Products' internal signal processing algorithms for "spatial audio" perform the specific steps of (1) mid-side (sum/difference) decomposition, (2) application of frequency-specific gains to those separate components, and (3) recombination, as required by claim 1? Google's complaint makes a direct denial of this functionality. Compl. ¶26

10,721,564 Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality (as denied by Google)	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;	The complaint alleges that the Accused Google Products "do not determine a listening angle between the earbuds or between the built-in speakers for the purpose of performing crosstalk cancellation on the audio signal."	¶34	col. 5:1-12
generating a compensation signal for a plurality of frequency bands of the audio signal, the compensation signal removing estimated spectral defects in each frequency band from crosstalk cancellation applied to the audio signal...;	The complaint does not provide sufficient detail for analysis of this specific element, beyond a general denial of infringement.	¶34	col. 3:10-18
precompensating the audio signal for the crosstalk cancellation by adding the compensation signal to the audio signal to generate a precompensated signal; and	The complaint does not provide sufficient detail for analysis of this specific element, beyond a general denial of infringement.	¶34	col. 2:40-44
performing the crosstalk cancellation on the precompensated signal based on the speaker parameter to generate a crosstalk cancelled audio signal.	The complaint alleges Google does not perform the step of "performing the crosstalk cancellation . . . based on the speaker parameter to generate a crosstalk cancelled audio signal."	¶34	col. 5:46-51

• Identified Points of Contention:
  • Scope & Factual Question: A central issue is what constitutes "determining a speaker parameter... comprising a listening angle." The dispute raises the question of whether this requires active, real-time measurement of the listening environment, or if it could be satisfied by using pre-programmed values based on the fixed geometry of a device (e.g., the known spacing of speakers on a phone). Google's denial suggests its products do not perform this step for the purpose of crosstalk cancellation. Compl. ¶34

V. Key Claim Terms for Construction

• The Term: "determining a speaker parameter ... comprising a listening angle" (from '564 Patent, claim 1)
• Context and Importance: This term is critical because Google's non-infringement argument for the '564 patent hinges on its assertion that the accused products do not "determine a listening angle" for the purpose of crosstalk cancellation. Compl. ¶34 Practitioners may focus on this term because its construction could decide whether using a fixed, pre-programmed angle based on device type falls within the claim's scope, or if an active measurement or user input is required.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification suggests parameters can be obtained from "a user input or system input (e.g., headphone jack detection event)," which may support an interpretation where "determining" includes recalling a stored value associated with a device type, not just active measurement. '564 Patent, col. 5:8-12
  • Evidence for a Narrower Interpretation: The specification also describes determining the angle through "interpreted captured user or system-generated sensor data, such as microphone signal analysis, [or] computer vision analysis," which may support an interpretation requiring a more dynamic, real-time assessment of the speaker-listener geometry. '564 Patent, col. 5:20-29

VI. Other Allegations

• Indirect Infringement: The complaint is for a declaratory judgment of non-infringement. Accordingly, Google alleges that it does not induce infringement because, among other reasons, there is no underlying direct infringement and because it "has not acted with the knowledge and specific intent necessary." Compl. ¶27 Compl. ¶35 Compl. ¶43 It further alleges it does not contributorily infringe because there is no underlying direct infringement, it lacks the requisite knowledge, and the accused products "have substantial non-infringing uses." Compl. ¶27 Compl. ¶35 Compl. ¶43
• Willful Infringement: The complaint does not directly address willfulness, as it is a complaint for declaratory judgment of non-infringement.

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

• A primary issue will be one of evidentiary fact: what are the precise, step-by-step software operations of the "spatial audio" features in Google's products? The case for all three patents will turn on technical evidence (e.g., source code analysis, expert testimony) establishing whether the accused products actually perform the specific methods of mid-side subband processing ('820 Patent), listening angle determination ('564 Patent), and asymmetry compensation ('527 Patent) as recited in the claims.
• A second core issue will be one of definitional scope, particularly for the '564 and '527 patents: can the term "determining" (e.g., "determining a speaker parameter" or "determine asymmetries") be construed to cover the use of pre-configured, fixed values based on a device's known hardware design? Or does it require an active, dynamic measurement of the user and their environment? The court's construction of this term will be critical in defining the boundary between infringement and non-infringement.