DCT

2:26-cv-00373

Cerence Operating Co v. Amazon.com Inc

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 2:26-cv-00373, E.D. Tex., 05/04/2026
  • Venue Allegations: Venue is alleged to be proper based on Defendants' regular and established places of business within the Eastern District of Texas, including multiple Amazon Fulfillment Centers. The complaint also cites judicial economy, as U.S. Patent No. 11,087,750 was previously litigated by Plaintiff in the same district.
  • Core Dispute: Plaintiff alleges that Defendant's smart devices and other products incorporating the Amazon Alexa voice assistant infringe seven patents related to conversational AI, speech recognition, noise suppression, and voice command processing.
  • Technical Context: The lawsuit concerns the technology underlying modern voice-activated virtual assistants, a key interface for consumer interaction with smart home devices, in-vehicle systems, and other electronics.
  • Key Procedural History: The complaint notes that U.S. Patent No. 11,087,750 was previously asserted in Cerence v. Samsung in the Eastern District of Texas, a case in which a claim construction order was entered. This prior judicial interpretation of claim terms in one of the asserted patents may influence claim construction proceedings in the current case.

Case Timeline

Date Event
2007-12-11 '248 Patent Priority Date
2009-03-30 '358 Patent Priority Date
2013-02-12 '358 Patent Issue Date
2013-03-12 '750 Patent Priority Date
2014-02-27 '576 Patent Priority Date
2016-02-05 '899 Patent Priority Date
2019-07-09 '248 Patent Issue Date
2019-10-01 Cerence spun out from Nuance Communications, Inc.
2020-09-22 '899 Patent Issue Date
2020-12-21 '663 Patent Priority Date
2021-04-26 '947 Patent Priority Date
2021-08-10 '750 Patent Issue Date
2023-10-24 '576 Patent Issue Date
2025-02-25 '947 Patent Issue Date
2025-09-02 '663 Patent Issue Date
2026-05-04 Complaint Filing Date

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

U.S. Patent No. 8,374,358 - "Method for Determining a Noise Reference Signal for Noise Compensation and/or Noise Reduction"

The Invention Explained

  • Problem Addressed: The patent describes the difficulty in obtaining a clean "noise reference signal" for noise cancellation, particularly when the unwanted noise source and the desired sound source are close to each other, which can lead to the desired signal bleeding into the noise reference and degrading cancellation quality '358 Patent, col. 1:1-2:2
  • The Patented Solution: The invention proposes a multi-channel system that uses two adaptive filters to process signals from two different microphones. The filters are adapted to model the acoustic transfer functions between the sound source and the microphones, allowing the system to create a noise reference signal where the "wanted signal component" is minimized or eliminated, thereby improving noise reduction performance '358 Patent, col. 3:1-12 '358 Patent, abstract
  • Technical Importance: This method provided a more robust way to isolate noise from a desired audio signal (like speech) in complex acoustic environments, a critical function for hands-free telephony and speech recognition systems.

Key Claims at a Glance

  • The complaint asserts infringement of the independent claims, but does not specify which ones Compl. ¶32 Claim 1 is an independent method claim.
  • The essential elements of independent claim 1 include:
    • receiving a first audio signal on a first signal path and a second audio signal on a second signal path;
    • filtering the first audio signal using a first adaptive filter to obtain a first filtered audio signal;
    • filtering the second audio signal using a second adaptive filter to obtain a second filtered audio signal;
    • combining the first and the second filtered audio signals to obtain the noise reference signal; and
    • adapting the filters to minimize a wanted signal component in the noise reference signal, where the filter transfer functions are based on the acoustic transfer functions between the wanted source and the signal paths.

U.S. Patent No. 10,347,248 - "System and Method for Providing In-Vehicle Services via a Natural Language Voice User Interface"

The Invention Explained

  • Problem Addressed: The patent background identifies that existing in-vehicle voice interfaces are often rigid, requiring users to memorize specific commands and syntaxes, which is cumbersome and distracting, especially in a mobile environment '248 Patent, col. 1:42-2:44
  • The Patented Solution: The patent describes a conversational, natural language voice user interface for an "integrated voice navigation services environment." The system can understand "free-form natural language" by leveraging context, shared knowledge of the user, and dialogue history to cooperatively resolve user requests, such as navigating to a partially specified destination '248 Patent, abstract '248 Patent, col. 2:47-3:24 The system architecture includes components like a conversational language processor, agents, and a context tracking engine to enable this functionality '248 Patent, Fig. 1
  • Technical Importance: This technology represents a shift from simple command-and-control voice systems to more sophisticated, human-like conversational AI, making in-vehicle systems more intuitive and safer to use while driving.

Key Claims at a Glance

  • The complaint asserts infringement of the independent claims, but does not specify which ones Compl. ¶39 Claim 1 is an independent method claim.
  • The essential elements of independent claim 1 include:
    • connecting, by an in-vehicle telematics system, to a mobile device;
    • receiving a first natural language utterance and determining its intent relates to a request for the mobile device;
    • transmitting the first request to the mobile device;
    • receiving a second natural language utterance and determining its intent relates to a request for an in-vehicle device;
    • transmitting the second request to the in-vehicle device; and
    • generating a request for additional information from a networked search engine if either the mobile or in-vehicle device has insufficient information to perform its respective request.

U.S. Patent No. 10,783,899 - "Babble Noise Suppression"

  • Technology Synopsis: The patent addresses the challenge of suppressing "babble noise"-unwanted speech from interfering speakers in a crowded environment. It discloses a system that uses a "soft speech detector" to dynamically estimate the likelihood of desired foreground speech and uses this estimate to control the aggressiveness of a noise suppressor, thereby reducing babble while minimizing distortion of the user's voice '899 Patent, abstract
  • Asserted Claims: The complaint asserts the independent claims without specifying them Compl. ¶46
  • Accused Features: The accused features are in Amazon products like Echo smart speakers, Echo Show displays, and Fire TVs, which operate in environments where babble noise is common Compl. ¶45

U.S. Patent No. 11,087,750 - "Methods and Apparatus for Detecting a Voice Command"

  • Technology Synopsis: The invention targets the need for manual or explicit "wake-word" triggers to activate voice assistants, especially when a device is in a low-power mode. The solution is a method of monitoring the acoustic environment using a multi-stage process and contextual cues (e.g., device motion) to detect a voice command without requiring an explicit trigger, enabling an "always-on" capability '750 Patent, abstract
  • Asserted Claims: The complaint asserts the independent claims without specifying them Compl. ¶53
  • Accused Features: The accused features are in Amazon Echo and Echo Show devices, which are designed to respond to voice commands, including from a low-power state Compl. ¶52

U.S. Patent No. 11,798,576 - "Methods and Apparatus for Adaptive Gain Control in a Communication System"

  • Technology Synopsis: The patent aims to provide a consistent audio experience in environments with fluctuating noise levels, such as a car. It describes a system for adaptive gain control that estimates speech and noise levels to adjust the audio gain, maintaining a desired signal-to-noise ratio (SNR) at the listener's position '576 Patent, abstract
  • Asserted Claims: The complaint asserts the independent claims without specifying them Compl. ¶60
  • Accused Features: The accused features are in various Amazon smart speakers, displays, and televisions that must manage audio output volume in relation to ambient noise Compl. ¶59

U.S. Patent No. 12,236,947 - "Flexible-Format Voice Command"

  • Technology Synopsis: The invention addresses the rigid structure of voice commands that require a wake-word to be at the beginning of an utterance. The patent discloses a system that can process commands where the wake-word may appear within or at the end of the utterance, or not at all, allowing for more natural, flexible command phrasing '947 Patent, abstract
  • Asserted Claims: The complaint asserts the independent claims without specifying them Compl. ¶67
  • Accused Features: The accused features are in Amazon smart displays like the Echo Show, which process natural language commands Compl. ¶66

U.S. Patent No. 12,406,663 - "Routing of User Commands Across Disparate Ecosystems"

  • Technology Synopsis: This patent addresses the challenge of a user in a vehicle controlling devices in separate, external "smart home" or "IoT" ecosystems. The invention is a system that uses a connection manager to analyze a user's command, identify the correct target ecosystem (e.g., a specific smart home brand), and route the command accordingly '663 Patent, abstract
  • Asserted Claims: The complaint asserts the independent claims without specifying them Compl. ¶74
  • Accused Features: The accused features are in Amazon Alexa Auto, which is designed to bridge the gap between the in-vehicle environment and external services Compl. ¶73

III. The Accused Instrumentality

Product Identification

The complaint identifies the "Accused Products" as a broad category of "smart devices... with Amazon Alexa" Compl. ¶1 Specific exemplary products mentioned include Amazon Echo smart speakers (e.g., Echo Studio, Dot Max), Amazon Echo Show smart displays, Amazon Fire TVs, Amazon Fire tablets, Amazon Fire TV Cube, and the Amazon Alexa Auto device Compl. ¶31 Compl. ¶38 Compl. ¶45 Compl. ¶52 Compl. ¶59 Compl. ¶66 Compl. ¶73

Functionality and Market Context

The Accused Products are voice-activated consumer electronics that use the Amazon Alexa virtual assistant to perform tasks, control entertainment, and interact with other services Compl. ¶27 The complaint alleges that these products have seen widespread consumer adoption and that the technology is expanding from automotive markets into home entertainment systems, creating a large market for virtual assistants Compl. ¶27 The functionality central to the dispute involves speech recognition, natural language understanding, noise filtering, and processing of voice commands to perform actions Compl. ¶¶26-27 No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint states that claim charts for each asserted patent are attached as exhibits Compl. ¶32 Compl. ¶39 Compl. ¶46 Compl. ¶53 Compl. ¶60 Compl. ¶67 Compl. ¶74 As these exhibits were not provided, the infringement allegations are summarized below in prose.

'358 Patent Infringement Allegations
The complaint alleges that Amazon's smart speakers and displays, such as the Echo Studio and Echo Show, infringe the '358 Patent Compl. ¶31 The core of the infringement theory is that these devices, which employ microphone arrays to capture user speech in noisy environments, must necessarily implement a method for creating a noise reference signal to effectively cancel background noise and isolate the user's voice. This functionality is alleged to embody the claimed method of using multiple adaptive filters to minimize the wanted speech component in the noise reference signal.

'248 Patent Infringement Allegations
The complaint alleges that the Amazon Alexa Auto product infringes the '248 Patent Compl. ¶38 The infringement theory centers on Alexa Auto's function as an interface between the user in a vehicle, their mobile device, and in-vehicle systems. The complaint suggests that Alexa Auto's ability to process natural language commands to interact with both the phone (e.g., for calls) and other systems (e.g., for navigation) meets the claim limitations of receiving and arbitrating between utterances intended for a mobile device and utterances intended for an in-vehicle device.

  • Identified Points of Contention:
    • Scope Questions:
      • For the '358 Patent, a question may arise as to whether the specific noise reduction techniques used in Amazon's products meet the detailed steps of the claimed method, particularly the use of two distinct adaptive filters adapted in the manner specified by the claims.
      • For the '248 Patent, a key question will be whether the architecture of the Alexa Auto system, which integrates a user's phone with a separate device, maps onto the claimed "in-vehicle telematics system" that "connect[s]... to a mobile device." The defense may argue that Alexa Auto is merely an accessory to the mobile device rather than a distinct telematics system connecting to it.
    • Technical Questions:
      • What evidence does the complaint provide that Amazon's products perform noise reduction using the specific dual-adaptive-filter structure required by claim 1 of the '358 Patent, as opposed to other known noise reduction methods?
      • Does the Alexa Auto system distinguish between requests "to be handled by the mobile device" and requests "to be handled by an in-vehicle device" as separate intents as required by claim 1 of the '248 Patent, or does it function as a single, unified interface that abstracts these distinctions from the user?

V. Key Claim Terms for Construction

For the '358 Patent:

  • The Term: "noise reference signal"
  • Context and Importance: The entire purpose of the invention is to create a high-quality "noise reference signal." The definition of this term and how it is formed is central to the infringement analysis. Practitioners may focus on this term because its construction will determine whether the output of Amazon's noise filtering process, whatever its internal mechanics, can be considered to be the claimed signal.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The patent repeatedly refers to the goal of obtaining a signal for "noise compensation and/or noise reduction," suggesting the term could broadly cover any signal generated for that purpose '358 Patent, title '358 Patent, col. 1:1-3
    • Evidence for a Narrower Interpretation: Claim 1 requires combining the outputs of two specific adaptive filters to obtain the signal, and the abstract describes it as a signal where the "wanted signal component" is minimized. This suggests a narrower definition tied to a signal that has been processed in a specific way to remove desired audio '358 Patent, claim 1 '358 Patent, abstract

For the '248 Patent:

  • The Term: "in-vehicle telematics system"
  • Context and Importance: Infringement of claim 1 requires that the accused system be an "in-vehicle telematics system" that performs the claimed steps. Amazon may argue that Alexa Auto is a consumer electronic accessory and not a "telematics system" in the traditional automotive sense.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification is broad, stating the system can control "navigation devices, media devices, personal computers, personal digital assistants, wireless phones, or other computing devices" '248 Patent, col. 12:13-17 This could support an interpretation that includes add-on devices like Alexa Auto.
    • Evidence for a Narrower Interpretation: The title and claims repeatedly use the term "in-vehicle," and the background focuses on the automotive context '248 Patent, title '248 Patent, col. 1:4-9 This may support an argument that the term is limited to systems integrated into the vehicle by the manufacturer, not aftermarket consumer devices.

VI. Other Allegations

  • Indirect Infringement: For all asserted patents, the complaint alleges induced infringement under 35 U.S.C. § 271(b). The allegations are based on Amazon disseminating product information, user guides, and online instructions that allegedly encourage and instruct end-users to use the Accused Products in an infringing manner Compl. ¶33 Compl. ¶40 Compl. ¶47 Compl. ¶54 Compl. ¶61 Compl. ¶68 Compl. ¶75 The complaint provides URLs to Amazon's product and support pages as evidence (Compl. ¶33, fn. 3; Compl. ¶40, fn. 4; etc.).
  • Willful Infringement: The complaint alleges that Amazon's infringement "is and has been willful" for all seven patents Compl. ¶35 Compl. ¶42 Compl. ¶49 Compl. ¶56 Compl. ¶63 Compl. ¶70 Compl. ¶77 The basis for willfulness is pleaded on "information and belief" and alleges knowledge as of at least the filing date of the complaint Compl. ¶33 Compl. ¶40

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

This case presents a broad challenge to the voice processing technology stack at the core of Amazon's Alexa ecosystem. The key questions for the court will likely revolve around issues of technical specificity and definitional scope.

  • A primary issue will be one of technical equivalence: Does the complaint provide sufficient factual detail to suggest that Amazon's proprietary and likely complex software for noise reduction, voice-command parsing, and ecosystem routing performs the specific methods laid out in the claims of the asserted patents, or is there a fundamental mismatch in technical operation that will be revealed in discovery?
  • A second core issue will be one of definitional scope: Can terms rooted in specific technical contexts, such as "in-vehicle telematics system" from the '248 Patent, be construed broadly enough to cover modern, multi-purpose consumer electronic accessories like Amazon Alexa Auto, which did not exist when the patent application was filed?
  • A third question will be one of prior art and obviousness: Given Cerence's history as a spin-out of Nuance, a foundational company in speech recognition, a key battleground will likely be the validity of the patents themselves. The court will have to consider whether the claimed inventions represented non-obvious improvements over the crowded and rapidly evolving field of speech processing and conversational AI during the relevant time periods.
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