Microphone Array Beamforming with Paused Source Tracking

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Solution Overview

Problem

Beamforming microphone arrays with steerable directional pickup patterns often consume resources inefficiently or produce inaccurate results due to the source tracker's inefficient operation.

Innovation Solution

The source tracking of the source tracker is paused if a user begins to speak and is likely to continue, and resumed when the user stops, with pause durations adjusted based on user likelihood of movement and environment, and a delay is introduced to allow fine-tuning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If source tracking is continuously performed to maintain accurate beamforming targeting, then beamforming accuracy is improved, but resource consumption increases

Engineering Contradiction:

Improvebeamforming accuracyVSAvoidresource consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The source tracker operates periodically rather than continuously. The system pauses source tracking during periods when the audio source is likely to remain stationary (determined by pause duration comparisons), and resumes tracking when movement is detected or pause duration expires. This periodic operation maintains beamforming accuracy when needed while reducing resource consumption during stable periods.

Inventive Principle:

Principle #19Periodic action

2Use of energy by moving object

If source tracking is paused to reduce resource consumption, then resource efficiency is improved, but beamforming accuracy deteriorates

Engineering Contradiction:

Improveresource efficiencyVSAvoidbeamforming accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The system uses feedback from pause duration comparisons and activity detection to dynamically control source tracking. The source tracker monitors whether the current pause duration exceeds a threshold, and automatically resumes tracking when the threshold is exceeded or when audio activity indicates the source may have moved. This feedback mechanism ensures beamforming accuracy is maintained when necessary while maximizing resource efficiency during stable periods.

Inventive Principle:

Principle #23Feedback

3Use of energy by moving object

If source tracking is paused indefinitely to save resources, then resource consumption is reduced, but the system becomes unresponsive to source movement

Engineering Contradiction:

Improveresource consumptionVSAvoidresponsiveness to source movement

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The source tracking system dynamically adjusts its operation based on real-time conditions. The pause duration is continuously compared against thresholds, and the system transitions between paused and active tracking states accordingly. This dynamic behavior allows the system to save resources during stable periods while quickly adapting to source movement when it occurs, maintaining both resource efficiency and responsiveness.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260080873A1Microphone Array Beamforming Control

Publication Date: 2026.03.19 COMCAST CABLE COMM LLC

AI summary

Systems, apparatuses, and methods are described for controlling source tracking and delaying beamforming in a microphone array system. A source tracker may continuously determine a direction of an audio source. A source tracker controller may pause the source tracking of the source tracker if a user may continue to speak to the system. The source tracker controller may resume the source tracking of the source tracker if the user may cease to speak to the system, or when one or more pause durations have been reached.