Combo Loudspeaker-Motor Drive With Predictive Nonlinear Compensation
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Solution Overview
Problem
The existing method of driving Combo components, which integrate a loudspeaker and a motor, results in distortion due to the analog frequency divider causing discrepancies between actual and desired signals, leading to reduced performance and user experience.
Innovation Solution
A Combo system with a nonlinear compensator and frequency-division predictor is introduced to pre-distort and correct loudspeaker and motor signals, ensuring consistency with desired phases and amplitudes through digital-to-analog conversion and frequency division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an analog frequency divider is used to separate loudspeaker and motor signals, then frequency division is achieved, but distortion in frequency response amplitudes and phases occurs
Solution Approach 1:
The patent replaces the analog frequency divider (electrical/mechanical system) with a digital frequency division approach. The digital signal processor performs frequency division in the digital domain, avoiding the amplitude and phase distortion inherent in analog frequency dividers. This substitution maintains signal accuracy while achieving the required signal separation.
Solution Approach 2:
The patent applies pre-distortion treatment to the digital signal before it reaches the frequency divider. By pre-compensating for the expected distortion from the analog frequency divider, the system anticipates and counteracts the amplitude and phase errors, ensuring that the final output signal matches the desired signal characteristics.
2Reliability
If pre-distortion treatment is applied to loudspeaker digital signal, then distortion in sound pressure output is eliminated, but the analog frequency divider causes additional distortion that renders pre-distortion ineffective
Solution Approach 1:
The patent implements a feedback mechanism where the actual output signal from the analog frequency divider is measured and used to adjust the pre-distortion parameters. By continuously monitoring the distortion introduced by the frequency divider and adjusting the pre-distortion compensation accordingly, the system maintains effective distortion cancellation despite the presence of the analog frequency divider.
3Ease of operation
If digital signal fusion is performed before power amplification, then integrated control is achieved, but signal distortion increases due to analog frequency division
Solution Approach 1:
The patent segments the signal processing into distinct digital and analog stages. Digital signal fusion is performed separately for loudspeaker and motor channels, then each channel undergoes independent frequency division. This segmentation allows optimization of each stage independently, maintaining signal fidelity while preserving the benefits of integrated digital control.
Data Source
AI summary
A Combo system and a method of driving the Combo system are provided. The Combo system includes a loudspeaker, a motor, an analog frequency divider, a power amplifier, a signal fuser, a nonlinear compensator, and a frequency-division predictor. The nonlinear compensator pre-distorts a digital signal of the loudspeaker to obtain a loudspeaker pre-distorted digital signal. The signal fuser fuses the loudspeaker pre-distorted digital signal with a digital signal of the motor to obtain a fused digital signal. The frequency-division predictor predicts voltage data loaded on two ends of the loudspeaker if the fused digital signal is transmitted to the analog frequency divider and divided by the analog frequency divider. The nonlinear compensator corrects the loudspeaker pre-distorted digital signal based on the voltage data to enable the loudspeaker analog signal to be consistent with the loudspeaker pre-distorted digital signal.