Audio Filter Circuit for Spatial Enhancement and Equalization
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Solution Overview
Problem
Existing audio signal processing technologies face challenges in efficiently implementing both spatial enhancement and frequency response equalization with reduced hardware cost and power consumption, particularly in portable devices where filter complexity and power consumption are concerns.
Innovation Solution
An audio signal processing circuit arrangement that combines spatial enhancement and equalization functions by processing sum and difference signals through separate filters and recombining them, reducing the number of filters and computations required, thereby minimizing hardware cost and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three separate filters are implemented for spatial enhancement and equalization, then audio processing functionality is complete, but hardware cost and complexity increase
Solution Approach 1:
The patent combines spatial enhancement filter and equalization filter into a single integrated filter structure. The filter processes both spatial enhancement parameters (crosstalk cancellation) and equalization parameters (frequency response adjustment) simultaneously, reducing the three separate filters to one unified filter while maintaining complete audio processing functionality
Solution Approach 2:
The integrated filter is designed to perform multiple functions: spatial enhancement (crosstalk cancellation), frequency response equalization, and headroom management. By making the filter multi-functional, the patent eliminates the need for separate dedicated filters for each function, thereby reducing hardware complexity without sacrificing versatility
2Adaptability or versatility
If three separate filters are implemented for spatial enhancement and equalization, then audio processing functionality is complete, but power consumption increases
Solution Approach 1:
The patent merges spatial enhancement and equalization filtering operations into a single filter implementation, reducing the total number of filter computations required. This consolidation directly reduces power consumption while preserving complete audio processing functionality
Solution Approach 2:
The unified filter is designed to handle multiple audio processing tasks simultaneously, eliminating redundant computations that would occur with separate filters. This multi-functional approach reduces the overall computational load and associated power consumption
3Adaptability or versatility
If filters are cascaded for spatial enhancement and equalization, then both functions are achieved, but signal headroom requirements increase causing potential overloads
Solution Approach 1:
The patent combines spatial enhancement and equalization into a single filter stage, eliminating the cascaded filter structure. This prevents the accumulation of gain across multiple stages and avoids intermediate signal overloads, thereby improving headroom management and system reliability
Data Source
AI summary
The present invention relates to audio signal processing such as equalisation and spatial enhancement functions. The present invention provides an audio signal processing circuit arrangement for two audio channels, and which combines spatial enhancement or acoustic mixing (crosstalk) cancelling with graphic equalisation functions. This is achieved with a circuit structure having a reduced filter count compared with known cascaded circuits dedicated to each function. The circuit structure processes the sum and difference signals through separate filters and then recombines them to recover the separate channels (adding and subtracting respectively).