Audio Interference Suppressor in Analog Audio Interface | Sciencefather #Researcherawards

Introduction

Ground loop interference remains a persistent challenge in analog audio systems, particularly in setups using unbalanced connections. The unwanted hum and noise generated from potential differences in protective earth paths can severely degrade audio quality. To address this issue, a passive Audio Interference Suppressor in Analog Audio Interface (AISAAI) has been developed, offering a robust and cost-effective solution. Integrated into an Analog Audio Interconnection System (AAIS) framework, AISAAI ensures improved sound clarity while maintaining electrical safety.

Problem of Ground Loop Interference

Unbalanced audio connections are prone to noise due to their direct dependence on shared ground paths. Ground loop interference occurs when multiple devices connected to a protective earth create voltage differences that induce hum into the audio signal. This phenomenon is especially problematic in professional and consumer audio environments where equipment interconnectivity is high. Identifying common-mode voltages as the dominant source of interference is essential for designing effective suppression mechanisms.

Design and Functionality of AISAAI

The AISAAI circuit is introduced between an audio device’s rectifier ground and protective earth terminal to provide an optimized impedance path. This configuration ensures that noise-causing voltage fluctuations are mitigated without compromising user safety. Unlike active suppression methods, AISAAI is entirely passive, making it both reliable and energy-efficient. Its structural simplicity supports widespread implementation in analog audio interfaces.

Analog Audio Interconnection System (AAIS) Framework

The AAIS framework provides a systemic model for understanding interference pathways in interconnected audio systems. By evaluating device interconnections, ground references, and protective earth paths, AAIS highlights where suppression is most effective. This framework not only contextualizes AISAAI’s role but also provides a foundation for future research into audio interference control strategies.

Experimental Evaluation and Results

Comprehensive testing confirmed that AISAAI achieves a 15–30 dB reduction in interference across the audio band. Significantly, this performance remains consistent regardless of interconnect cable characteristics, proving the device’s robustness. The experimental outcomes validate AISAAI as a highly practical tool for both professional studios and consumer-level audio systems.

Research Implications and Future Directions

The successful implementation of AISAAI underlines the importance of combining theoretical frameworks like AAIS with practical circuit designs. Future research may explore hybrid suppression techniques that integrate passive and active solutions for even greater interference control. Additionally, adapting AISAAI for balanced systems and digital interfaces could expand its application across broader audio engineering domains.

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