Variable-Resolution Graphic Equalizer for Precise Frequency Control
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Solution Overview
Problem
Existing audio equalizer systems require a large number of controls or graphics for precise frequency adjustments, which can be cumbersome and inefficient, especially in hardware and software interfaces.
Innovation Solution
A hybrid graphic equalizer interface with a first set of faders for gain control and a second set of controls to define a frequency range, automatically assigning underlying EQ elements to each fader, allowing for efficient gain adjustments across the audio spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of individual EQ sections (e.g., 120 controls) are used to achieve precise frequency control across the audio spectrum, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The equalizer interface is segmented into multiple octave bands (e.g., 10 octaves), with each band containing a manageable number of frequency controls (e.g., 3 bands per octave). This segmentation allows precise control across the entire audio spectrum while keeping each control group manageable, resolving the contradiction between comprehensive precision and operational complexity.
Solution Approach 2:
The interface organizes frequency controls in a two-dimensional grid structure with octaves as one dimension and frequency bands per octave as another dimension. This spatial organization allows users to navigate and control 120+ frequency parameters systematically through a structured layout rather than presenting all controls in a single overwhelming list, thereby improving ease of operation while maintaining precision.
2Measurement precision
If a large number of individual EQ sections (e.g., 120 controls) are used to achieve precise frequency control, then measurement precision is improved, but ease of operation worsens due to tedious manual adjustment
Solution Approach 1:
By dividing the equalizer into octave segments with 3 bands per octave, the system allows users to focus on smaller, more manageable groups of controls for each octave rather than adjusting all 120 controls sequentially. This segmentation improves operational efficiency while maintaining the ability to achieve precise frequency control across the full spectrum.
Solution Approach 2:
The system pre-organizes frequency controls into standard octave bands with predetermined frequency allocations (3 bands per octave). This preliminary structuring eliminates the need for users to manually configure the entire frequency spectrum from scratch, allowing them to work efficiently within pre-established organizational frameworks while still achieving precise control where needed.
3Measurement precision
If hardware interfaces with many controls are used, then frequency control precision is improved, but manufacturing cost increases
Solution Approach 1:
The equalizer is designed with a segmented architecture of 10 octaves with 3 bands per octave, creating a modular control structure. This segmentation allows the system to achieve comprehensive frequency control precision while using a manageable number of discrete hardware controls, reducing manufacturing complexity and cost compared to implementing all 120 controls as separate physical components.
Solution Approach 2:
Each frequency band control in the segmented structure serves multiple functions: it controls gain for its specific frequency range, contributes to the overall frequency response shaping, and can be adjusted independently within the octave framework. This multi-functionality reduces the need for additional specialized controls, lowering manufacturing costs while maintaining precision.
Data Source
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AI summary
A variable-resolution graphic equalizer providing an improved interface for controlling gain values across the entire audio spectrum using many narrow-band filters (e.g., 120). It allows user selection of a frequency range for graphic equalization and automatically maps a reduced and fixed number of sliders to the selected range based on the number of filter bands falling within the selected range. In an audio processing system, specific user interface regions are highlighted to display selected frequency ranges and corresponding selected sliders to allow for rapid and precise equalization of the full audio spectrum using the many narrow-band filters.