Audio processing method and audio device

The method dynamically adjusts the limiter threshold based on battery voltage to prevent amplifier distortion, ensuring optimal power amplifier output and improved audio quality.

WO2026102646A1PCT designated stage Publication Date: 2026-05-21HARMAN INT IND INC +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HARMAN INT IND INC
Filing Date
2024-11-14
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing audio devices face issues with amplifier distortion due to a fixed limiter threshold that does not adapt to changes in the maximum undistorted output voltage of the power amplifier, often caused by variations in battery voltage, leading to unpleasant hearing experiences.

Method used

A signal processing method that dynamically adjusts the limiter threshold based on real-time battery voltage information, using a lookup table to determine the maximum undistorted output voltage of the power amplifier, thereby controlling the amplitude of input signals to prevent distortion while maintaining the maximum possible output.

Benefits of technology

Effectively suppresses amplifier distortion and maintains the highest possible output of the power amplifier, providing a better hearing experience by adapting the limiter threshold to battery voltage changes.

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Abstract

The present disclosure proposes a signal processing method, an audio device, a computer-readable storage medium, and a computer program product. The signal processing method for an audio device includes receiving an input audio signal; acquiring voltage information of a battery of the audio device; adjusting a first threshold for a first limiter of the audio device based on the voltage information; processing the input audio signal at least by utilizing the first limiter based on the first threshold to generate a processed audio signal; and amplifying, by a power amplifier of the audio device, the processed audio signal to generate an amplified audio signal for output to a speaker of the audio device.
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