Audio Signal Processing Combining FIR Filters
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Solution Overview
Problem
Musicians and sound technicians face challenges in replicating and enhancing sound qualities from musical instruments, as existing technologies struggle to efficiently emulate different acoustic environments, instrument types, and spatial relationships, leading to limitations in sound reproduction and amplification.
Innovation Solution
A device and method that apply filters to audio input signals using digital signal processing, combining impedance correction and acoustic transformation filters to simulate various acoustic environments and instrument combinations, allowing for the creation of richer sounds and special effects, while maintaining low computational power and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters are applied to audio input signals to emulate different acoustic environments and instrument combinations, then sound quality and versatility are improved, but computational power and processing time increase
Solution Approach 1:
The audio signal processing is divided into separate filter stages: impedance correction filter for instrument-specific corrections, acoustic transformation filter for environment emulation, and delay filter for spatial effects. Each filter processes specific aspects independently, allowing efficient computation while achieving comprehensive sound transformation.
Solution Approach 2:
Impedance correction filters are applied first to pre-correct the instrument signal characteristics before subsequent acoustic transformation and spatial processing. This preliminary correction establishes a accurate base signal that reduces the computational burden on later filters by preventing error propagation.
2Adaptability or versatility
If multiple filters are applied to audio input signals to emulate different acoustic environments and instrument combinations, then sound quality and versatility are improved, but device complexity increases
Solution Approach 1:
The device employs a universal filter architecture where the same impedance correction filter can be applied to different instrument types (guitars, violins, cellos), and the acoustic transformation filter can emulate various environments (concert halls, small rooms, outdoor spaces). This multi-functional design reduces device complexity by avoiding instrument-specific or environment-specific hardware variations.
Solution Approach 2:
Multiple filter functions (impedance correction, acoustic transformation, delay processing) are merged into a single integrated signal processing device that receives one input signal and produces one processed output signal. This consolidation reduces device complexity compared to having separate independent devices for each filter function.
Data Source
AI summary
A method and device may color or modify the tone or sound quality of audio input signals. A processor such as a DSP, may apply two or more filters to the audio input signal, each filter comprising a set of filter coefficients. The processor may combine finite impulse response (FIR) filters of the two or more filters into a power-saving filter. A speaker or sound emitter may emitting an output audio signal from the filtered audio input signal. The output audio signal has a different tone quality than that of the input audio signal.