Equalizer Coefficient Interpolation for Low-Complexity Audio Tuning
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Solution Overview
Problem
Conventional methods for adjusting equalization filter coefficients for headphones are complex and difficult for end users to handle, making it challenging to achieve good audio quality with sound transducers like headphones.
Innovation Solution
An equalization filter coefficient determinator that continuously or quasi-continuously fades between different equalizer settings based on a small number of setting parameters, allowing users to easily adjust the filter coefficients without dealing with the high number of filter parameters, using techniques such as principle component analysis to simplify the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods for adjusting equalization filter coefficients are used, then audio quality can be improved, but the complexity of operation increases significantly for end users
Solution Approach 1:
The patent extracts the essential characteristics of equalization filter coefficients from the full set of coefficients. By identifying and isolating the most influential parameters that dominate the frequency response characteristics, the system allows users to adjust audio quality by controlling only these extracted key parameters rather than all coefficients, thereby simplifying operation while maintaining audio quality improvement capability
Solution Approach 2:
The patent transforms the adjustment process by changing the parameter representation from the complete set of filter coefficients to a reduced set of key parameters. This parameter transformation enables users to control the equalization effect through fewer, more intuitive parameters while the system automatically computes the corresponding full coefficient set, resolving the contradiction between precision and ease of operation
2Manufacturing precision
If the number of equalization filter parameters is increased to achieve better audio quality, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The system extracts the dominant characteristics from the complete set of equalization filter coefficients by identifying key parameters that capture the essential frequency response behavior. This extraction process reduces the number of parameters that need to be explicitly handled and stored, thereby reducing device complexity while preserving the capability to achieve accurate frequency response through the remaining key parameters
Solution Approach 2:
The patent segments the full set of equalization filter parameters into key parameters and secondary parameters. The key parameters are retained for explicit control and adjustment, while the secondary parameters are derived or fixed based on the key parameters. This segmentation reduces the effective number of parameters that contribute to device complexity while maintaining the precision needed for accurate frequency response control
Data Source
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AI summary
An equalization filter coefficient determinator for determining a current set of equalization filter target coefficients for use by an equalizer is configured to continuously or quasi-continuously fade between a plurality of different equalizer settings in dependence on one or more setting parameters, to obtain the current set of equalization filter target coefficients describing a current equalizer setting. A number of setting parameters is smaller than a number of equalization filter target coefficients of current set of equalization filter target coefficients. An equalization filter coefficient determinator is configured to linearly combine a plurality of equalization filter target coefficient set components in dependence on one or more setting parameters, to obtain the current set of equalization filter target coefficients. An equalization filter coefficient determinator is configured to obtain the current set of equalization filter target coefficients in dependence on a two-dimensional position information or a three-dimensional position information obtained using a two-dimensional or three-dimensional user input device. An apparatus comprises a user interface, an equalization filter coefficient determinator and an equalizer. An equalization filter coefficient processor may provide sets of basis equalization filter target coefficients. A system may use an equalization filter coefficient processor and an equalization filter coefficient determinator.