# How AI Cleans Up Irrelevant Topics in Recorded Phone Calls > A system that automatically identifies and removes 'noisy' or irrelevant topics from call center transcripts by analyzing how consistently and broadly those words appear. - **Patent:** US 11521601 - **Original title:** Detecting extraneous topic information using artificial intelligence models - **Owner:** Invoca Inc - **Granted:** 2022 - **Status:** Active - **Times cited:** 1 - **Field:** ai_ml, software, telecommunications ## What it does This patent describes a way to make AI-powered call analysis more accurate by filtering out 'extraneous' topics that don't provide useful business insights. It works by looking at call transcripts and calculating two specific metrics for each identified topic: a vocabulary score (based on the entropy of word distributions) and a consistency score (how often that topic appears across different calls). If a topic is too broad or lacks consistency, the system flags it as noise. It then automatically updates the AI model to either remove that topic from the results or visually separate it, ensuring that human analysts only see the most relevant conversation data. ## What it does NOT cover - Does not cover general speech-to-text transcription methods. - Does not cover manual topic tagging performed by human agents. - Does not cover sentiment analysis or emotion detection in calls. - Does not cover real-time audio processing (it requires pre-stored transcripts). ## The clever bit The system uses 'burst concentration' and entropy-based vocabulary scoring to mathematically define what makes a topic 'extraneous,' effectively turning a subjective human judgment (is this topic noise?) into a repeatable, automated filter. ## Real-world examples 1. Call center analytics platforms 2. Automated customer service quality assurance software 3. Sales intelligence tools for tracking prospect objections ## Why it matters In call centers, AI models often get distracted by 'filler' topics like standard greetings or background noise, which dilutes the value of data analytics. By automating the cleanup of these topics, Invoca's system helps businesses focus on actionable insights, such as specific customer pain points or sales objections, without needing manual data scrubbing. ## Frequently asked questions ### What does How AI Cleans Up Irrelevant Topics in Recorded Phone Calls cover? A system that automatically identifies and removes 'noisy' or irrelevant topics from call center transcripts by analyzing how consistently and broadly those words appear. ### Who owns patent US 11521601? Invoca Inc owns this patent, granted in 2022. ### When does this patent expire? This patent is expected to expire on December 6, 2042, when the invention enters the public domain. ### What is patent US 11521601 cited by? This patent has been cited by 1 later patents that build on its ideas. ### What problem does this patent solve? In call centers, AI models often get distracted by 'filler' topics like standard greetings or background noise, which dilutes the value of data analytics. By automating the cleanup of these topics, Invoca's system helps businesses focus on actionable insights, such as specific customer pain points or sales objections, without needing manual data scrubbing. ### What does this patent NOT cover? Does not cover general speech-to-text transcription methods. **Full plain-English explainer:** https://patentbrief.org/patent/us/11521601/stylegan **Original patent:** https://patents.google.com/patent/US11521601 --- _Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._ ## Related patents Semantically similar inventions in the PatentBrief corpus: - [Using Non-AI Systems to Improve AI Text Generation](https://patentbrief.org/patent/us/12353827/computer-implemented-methods-for-the-automated-analysis-or-use-of-data-including) — This patent describes a method where a traditional, rule-based computer system helps a Large Language Model (LLM) generate more accurate and reliable text by providing it with better context and fact-checking. - [How a Smart System Verifies and Updates Customer Data](https://patentbrief.org/patent/us/8285656/cortana-virtual-assistant) — This patent describes an automated system that uses artificial intelligence to pick the best ways to check and update information about people or businesses, choosing from methods like web searches, phone calls, or direct mail. - [How AI Predicts Who Will Speak Next in a Conversation](https://patentbrief.org/patent/us/11645473/palm-pathways-language-model) — IBM's patent describes a system that uses neural networks to analyze speech patterns and intentions to predict which person will talk next in a conversation. - [How Computers Automatically Label Different Speakers in Audio Recordings](https://patentbrief.org/patent/us/6424946/amazon-personalized-recommendations) — A method for identifying and labeling speakers in audio recordings, even if the system has never heard the person speak before, by grouping similar voices and asking a user to name them. - [How to Automatically Detect and Fix Changes in AI Model Data](https://patentbrief.org/patent/us/10599957/systems-and-methods-for-detecting-data-drift-for-data-used-in-machine-learning-m) — This patent describes a system that automatically notices when the real-world data an AI model sees changes, causing its predictions to become less accurate, and then fixes the model.