Motion Sensor Signal Fidelity via Voice and Haptic Noise Cancellation

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Solution Overview

Problem

Motion sensors on head-mounted displays and other devices pick up subtle vibrations from users while speaking or from haptic generator-induced vibrations, reducing the fidelity of the 'true' motion output.

Innovation Solution

An assembly with at least one motion sensor and a processor configured to subtract signals from a microphone and/or haptic signal detector to cancel voice and haptic components from the motion sensor signals, improving the fidelity of the motion output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Difficulty of detecting and measuring

If motion sensors are mounted on HMD to detect head motion, then motion detection capability is improved, but measurement precision deteriorates due to pickup of voice and haptic vibrations

Engineering Contradiction:

Improvemotion detection capabilityVSAvoidmotion signal fidelity

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The patent segments the motion sensor system into multiple independent sensors (accelerometers, gyroscopes, magnetometers) that detect different physical quantities. By processing and combining their separate outputs, the system can isolate true motion signals from voice and haptic vibrations affecting each sensor differently.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces intermediary processing algorithms that act as mediators between the raw sensor data and the final motion output. These algorithms analyze patterns across multiple sensors to identify and remove voice-induced and haptic-induced artifacts, preserving only genuine motion components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Difficulty of detecting and measuring

If motion sensors detect all vibrations including voice and haptic components, then sensitivity is improved, but measurement precision deteriorates

Engineering Contradiction:

Improvevibration sensitivityVSAvoidmotion signal accuracy

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The patent extracts and removes specific unwanted components (voice vibrations and haptic vibrations) from the total vibration signal. By identifying characteristic patterns of these artifacts and subtracting them from the raw sensor data, the system retains only the genuine motion components for accurate measurement.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs feedback mechanisms where the system continuously monitors sensor outputs and adjusts processing parameters to distinguish between desired motion signals and unwanted artifacts. The processed output feeds back into the filtering algorithm to refine the separation of signal components.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250161797A1Improving fidelity of motion sensor signal by filtering voice and haptic components

Publication Date: 2025.05.22 SONY INTERACTIVE ENTERTAINMENT LLC

AI summary

To improve the fidelity of a motion sensor, voice-induced components in signals from the motion sensor as well as haptic-induced components in signals from the motion sensor are canceled prior to outputting the final motion signal to an app requiring knowledge of device motion, such as motion of a HMD for a computer game.