Speaker Thermal Modeling for Loudness-Preserving Temperature Control
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Solution Overview
Problem
The issue of temperature over-compression and significant loss of speaker sound loudness due to modeling by a single speaker in mobile devices, leading to noise and abnormal situations, is addressed.
Innovation Solution
A speaker temperature protection method and device that creates a target transfer function based on real-time temperature and fusion voltage, predicts speaker temperature, and adjusts gain processing to maintain the speaker within a safe temperature range while reducing audio distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single speaker thermal model is used for temperature protection, then the speaker temperature can be controlled, but it causes over-compression and significant loss of speaker sound loudness
Solution Approach 1:
The patent divides the single speaker thermal model into two separate thermal models: one for the speaker and one for the motor. This segmentation allows independent temperature prediction and protection for each component, preventing over-compression of the speaker signal while still providing effective temperature protection. The speaker's temperature can be accurately predicted without being overly conservative, thus maintaining sound loudness.
2Power
If the speaker sends out a large signal without protection, then the sound loudness is improved, but the speaker temperature rises to exceed the bearing range causing noise or abnormal situations
Solution Approach 1:
The patent implements a feedback mechanism where the predicted speaker temperature from the dedicated speaker thermal model is continuously monitored. When the predicted temperature approaches the maximum bearing range, the system adjusts the audio signal gain accordingly. This feedback loop allows the speaker to operate at high power levels safely, maintaining sound loudness while preventing temperature-induced noise or abnormalities.
3Device complexity
If a single power amplifier drives both speaker and motor in series, then cost and space are saved, but the speaker temperature protection becomes inaccurate leading to over-compression
Solution Approach 1:
Despite using a single power amplifier for both speaker and motor, the patent segments the thermal modeling into separate models for each component. The system extracts individual voltage and current characteristics for the speaker and motor from the combined series circuit, enabling accurate independent temperature prediction for the speaker without requiring separate physical amplifiers. This maintains cost and space efficiency while achieving precise temperature protection.
Data Source
AI summary
A speaker temperature protection method, a speaker temperature protection device, an electronic device, and a computer-readable storage medium are provided. The speaker temperature protection method includes creating a target transfer function based on a first measured temperature of the speaker and a first measured fusion voltage relative to the combination device, obtaining a first predicted temperature of the speaker based on the target transfer function, and determining a target gain according to the first predicted temperature of the speaker and a first fusion power relative to the combination device, and performing gain processing on an original audio signal input to the combination device based on the target gain, so as to provide temperature protection for the speaker. In this way, a temperature of the speaker is kept below a maximum allowable temperature and audio distortion is reduced.