Audio Filter Mixing Circuit for Flat Guitar Frequency Response
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Solution Overview
Problem
Existing audio processing devices for musical instruments, such as electric guitars, struggle to maintain a flat frequency characteristic across both low and high frequency ranges, often leading to phase interference and deterioration in sound quality.
Innovation Solution
An audio processing device comprising a first low-pass filter, a circuit with a first high-pass filter and a preamplifier, a second high-pass filter, and a second low-pass filter, along with an extractor and a mixer, which processes and blends the audio signals to achieve a desired frequency characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single audio signal path is used for amplification, then the device complexity is low, but the frequency characteristic becomes uneven and phase interference occurs
Solution Approach 1:
The audio signal path is divided into multiple parallel paths (first and second paths), each processing different frequency components through dedicated high-pass and low-pass filters. This segmentation allows independent optimization of each path's frequency response, achieving flat overall frequency characteristic while avoiding phase interference between components.
2Manufacturing precision
If multiple filter paths are introduced to improve frequency characteristic, then the sound quality improves, but the device complexity increases
Solution Approach 1:
Multiple processed audio signals from different filter paths are merged through an adder unit, combining the advantages of each path (high-frequency preservation, low-frequency enhancement) into a single unified output. This merging achieves flat frequency response and improved sound quality without requiring complex separate processing systems.
Solution Approach 2:
The audio processing device performs multiple functions simultaneously through its parallel path structure: high-frequency signal processing, low-frequency signal processing, phase alignment, and frequency response equalization all occur within a unified system architecture, reducing overall complexity despite the multi-path design.
Data Source
AI summary
An audio processing device includes: a first low-pass filter (LPF) to which an audio signal is input; a circuit to which the audio signal is input, including a first high-pass filter (HPF) and a preamplifier; a second HPF to which the audio signal is input; a second LPF to which an output signal of the circuit is input; an extractor, extracting each of an output signal of the first LPF, an output signal of the second HPF, and an output signal of the second LPF at a predetermined ratio; and a mixer, mixing the output signal of the first LPF, the output signal of the second HPF, and the output signal of the second LPF that are extracted.