Dynamic Frequency Band Allocation in Audio Processing
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Solution Overview
Problem
Existing audio processing devices face challenges in efficiently adapting to the characteristics of input audio signals and user hearing abilities, particularly in terms of power consumption and frequency resolution, especially when dealing with signals of reduced bandwidth, such as telephone signals.
Innovation Solution
An audio processing device with a dynamic frequency band allocation system that adjusts the number of processing channels based on input signal characteristics and user hearing profiles, using a control unit to manage the allocation and redistribution of frequency bands, allowing for optimized power consumption and frequency resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of processing channels is reduced to save power, then power consumption is reduced, but frequency resolution deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the number of processing channels based on input signal characteristics. The system can switch between different channel configurations (e.g., 64 channels for high resolution, 32 channels for balanced performance, 16 channels for power saving) according to the complexity and bandwidth of the input signal, allowing optimal trade-off between power consumption and frequency resolution in different operating conditions
Solution Approach 2:
The patent applies non-uniform channel allocation where different frequency regions are processed with different numbers of channels. Critical frequency regions (such as speech frequencies) receive higher channel density for better resolution, while less critical regions use fewer channels to save power, achieving localized optimization of the power-resolution trade-off
2Adaptability or versatility
If channel coupling is changed instantaneously to adapt to signal characteristics, then adaptability is improved, but recalibration requirements increase
Solution Approach 1:
The patent pre-calculates and stores optimal channel coupling configurations for different signal types and bandwidths. When the input signal characteristics are detected, the system directly switches to the pre-determined configuration without requiring instantaneous recalculation or recalibration, thereby maintaining high adaptability while avoiding the complexity of real-time recalibration
Solution Approach 2:
The system continuously monitors input signal characteristics (bandwidth, signal type) and uses this feedback to dynamically adjust the channel coupling configuration. This closed-loop control ensures the system adapts to changing signal conditions while maintaining optimal performance without excessive recalibration complexity
3Adaptability or versatility
If the number of input frequency bands is larger than processing channels, then frequency coverage is improved, but processing complexity increases
Solution Approach 1:
The patent combines multiple input frequency bands into a smaller number of processing channels through frequency band mapping. Adjacent or overlapping frequency bands are merged into single processing channels, allowing the system to cover a wide frequency range while reducing the number of independent processing paths and associated complexity
Data Source
AI summary
An audio processing device includes a) an input unit for converting a time domain input signal to a number NI of input frequency bands and b) an output unit for converting a number NO of output frequency bands to a time domain output signal. A signal processing unit processes the input signal in a number NP of processing channels, smaller than the number NI of input frequency bands. A frequency band allocation unit allocates input frequency bands to processing channels. A frequency band redistribution unit redistributes processing channels to output frequency bands, and a control unit dynamically controls the allocation of input frequency bands to processing channels and the redistribution of processing channels to output frequency bands.