Speaker Calibration Using Distance Data for Balanced Audio
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Solution Overview
Problem
In dual-channel mobile devices, inconsistencies in frequency response between left and right channel speakers cause sound fields to deviate from the center due to manufacturing tolerances and design differences, leading to suboptimal audio output.
Innovation Solution
A speaker adjustment method using a single microphone to obtain frequency responses and adjust speaker outputs based on distance information, eliminating volume influences caused by varying microphone-speaker distances and avoiding individual microphone differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single microphone is used to measure frequency responses of multiple speakers, then device complexity is reduced, but measurement precision deteriorates due to varying distances between the microphone and speakers
Solution Approach 1:
The patent changes the parameter of microphone position by measuring the closing angle of the lifting cover to calculate distance information. This allows the system to adapt to varying distances between the microphone and speakers dynamically, maintaining measurement precision while using a single microphone.
Solution Approach 2:
The system implements feedback by using the measured frequency responses and distance information to adjust speaker outputs. The processor calculates compensation values based on the measured data and applies them to balance the sound field, creating a closed-loop system that improves measurement accuracy despite distance variations.
2Ease of operation
If speaker outputs are adjusted without considering distance information, then adjustment process is simplified, but sound field balance deteriorates due to volume influences from varying distances
Solution Approach 1:
The patent incorporates distance information as an additional parameter in the speaker adjustment process. By calculating the closing angle and deriving distance information, the system adjusts speaker outputs based on both frequency responses and distance, achieving accurate sound field balance without significantly complicating the adjustment process.
3Measurement precision
If multiple microphones are used to eliminate individual microphone differences, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
Instead of using multiple microphones, the patent implements a feedback mechanism using a single microphone. The system measures frequency responses, calculates distance information based on the closing angle, and uses this feedback to adjust speaker outputs, thereby eliminating the need for multiple microphones while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces distance information as an intermediary parameter that mediates between the single microphone measurement and the multi-speaker adjustment. This intermediary allows the system to compensate for distance variations without requiring multiple microphones, effectively bridging the gap between simplified hardware and precise measurement.
Data Source
Figure 1A~1B
Figure 2~3
AI summary
A speaker adjustment method for adjusting a plurality of speakers is provided. The speaker adjustment method includes the following steps: respectively obtaining a plurality of frequency responses of the plurality of speakers by using one microphone; obtaining distance information between the microphone and the plurality of speakers; and adjusting outputs of the plurality of speakers according to the plurality of frequency responses and the distance information. In addition, an electronic device using the speaker adjustment method is also provided.