Loudspeaker Resonance Correction Using Filter-DRP Signal Combining
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Solution Overview
Problem
Consumer-grade loudspeakers, especially those in mobile devices, face challenges in balancing audio quality with cost due to audio resonance phenomena, which are difficult to address with existing digital signal-processing techniques that require expensive and complex hardware.
Innovation Solution
The use of a digital filter and dynamic-range processor (DRP) combination, where the digital filter equalizes the audio signal and applies partial correction for resonance, and the DRP applies complementary correction, with a signal combiner configuring weights to optimize the combined signal for non-linear dynamic-range correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If expensive and complex hardware is used to correct audio resonance, then audio quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex hardware-based resonance correction systems with a software-based digital signal processing approach. The digital filter and dynamic-range processor work together to correct resonance effects through algorithmic processing of the audio signal, eliminating the need for expensive analog correction hardware while maintaining audio quality.
Solution Approach 2:
The digital filter serves multiple functions: it equalizes the audio signal across different frequencies and simultaneously provides partial correction for resonance effects. This multi-functionality reduces the need for separate dedicated correction hardware, thereby reducing overall device complexity while improving audio quality.
2Manufacturing precision
If advanced resonance correction techniques are applied, then audio quality is improved, but power consumption increases
Solution Approach 1:
The digital filter applies partial correction for resonance effects rather than attempting complete correction. This partial action approach achieves sufficient audio quality improvement without requiring excessive processing power, thereby reducing power consumption while still effectively addressing the resonance problem.
3Device complexity
If simple correction methods are used, then device complexity is reduced, but ability to handle multiple resonance frequencies is limited
Solution Approach 1:
The system uses dynamic-range correction that adapts to different signal levels and resonance conditions. The digital filter and DRP work together to provide frequency-dependent correction that can handle multiple resonance frequencies across different operating conditions, making the system versatile without requiring complex hardware for each specific frequency.
Data Source
AI summary
An audio processing apparatus includes a digital filter, a signal combiner, and a dynamic-range processor (DRP). The digital filter is configured to receive a filter-input audio signal and to filter the filter-input audio signal, so as to produce a filter-output audio signal. The signal combiner is configured to combine the filter-input audio signal with the filter-output audio signal, so as to produce a combined audio signal. The DRP is configured to apply to the filter-output audio signal a dynamic-range correction that depends non-linearly on the combined audio signal.