Two-Channel Sound Balance Method for Phase Offset Correction
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Solution Overview
Problem
Two-channel electronic devices face challenges in achieving balanced sound fields due to differences in speaker unit design and internal mechanisms, requiring both gain-frequency and phase adjustments, but the complex electrical system makes precise phase adjustment difficult.
Innovation Solution
A two-channel balance method that includes gain-frequency adjustment, calculation of sampling delay, generation of test audio files, estimation of phase offset, determination of phase offset direction, and phase adjustment to correct sound field offsets, utilizing a device with components for delay calculation, audio file generation, phase offset estimation, and phase adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gain-frequency adjustment is performed to balance two-channel signals, then frequency response balance is improved, but phase offset and sound field positioning remain uncorrected
Solution Approach 1:
The patent separates the two-channel balance process into two distinct adjustment stages: gain-frequency adjustment for amplitude balance and phase adjustment for positioning accuracy. This segmentation allows each parameter to be optimized independently, resolving the contradiction between frequency balance and positioning accuracy.
Solution Approach 2:
The patent performs gain-frequency adjustment as a preliminary step before phase adjustment. By first establishing amplitude balance through EQ, the subsequent phase adjustment can focus solely on positioning accuracy without the confounding factor of amplitude differences.
2Ease of operation
If fixed phase adjustment parameters are assigned based on design specifications, then adjustment process is simplified, but actual phase offset correction is insufficient due to manufacturing variations
Solution Approach 1:
The patent implements a feedback mechanism where the system plays test audio files through the speaker units, captures the actual sound field characteristics using the sound receiving unit, and uses this measured data to calculate accurate phase offset values. This feedback loop ensures high correction accuracy while maintaining operational simplicity through automated calculation.
Solution Approach 2:
The system performs self-measurement and self-correction by using its own sound receiving unit to capture the actual acoustic environment and automatically calculating the required phase adjustments. This eliminates the need for external measurement equipment or complex manual calibration procedures.
3Adaptability or versatility
If complex electrical systems with multiple electronic elements are used, then device functionality is enhanced, but phase consistency across devices becomes difficult to maintain
Solution Approach 1:
The patent changes the approach from using fixed phase parameters to dynamically calculated parameters based on actual measurements. By measuring the real-world performance of each device and calculating custom phase offset values, the system maintains phase consistency across devices with varying electrical characteristics while preserving full device functionality.
Data Source
AI summary
A two-channel balance method and an electronic device using the same are provided. The two-channel balance method includes the following steps. A gain-frequency information of a two-channel signal is adjusted. A sampling delay information of the two-channel signal is calculated according to a distance information among a sound receiving unit, a left speaker unit and a right speaker unit. A forward test audio file or a surround test audio file is generated according to the sampling delay information. A phase offset information is estimated according to at least the forward test audio file or the surround test audio file. A phase offset direction information is determined. A phase information of the two-channel signal is adjusted according to the phase offset information and the phase offset direction information.