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Audio Interference Suppressor in Analog Audio Interface

izvorni znanstveni rad

izvorni znanstveni rad

Audio Interference Suppressor in Analog Audio Interface

Vrsta prilog u časopisu
Tip izvorni znanstveni rad
Godina 2025
Časopis Sensors
Volumen 25
Svesčić 18
Stranice str. 1-29
DOI 10.3390/s25185868
EISSN 1424-8220
Status objavljeno

Sažetak

Audio systems with unbalanced connections are susceptible to interference from ground loops, which manifests as hum and noise. This paper introduces and evaluates a novel passive Audio Interference Suppressor in Analog Audio Interface (AISAAI) designed to mitigate this problem. The AISAAI circuit is inserted between an audio device’s rectifier ground and its protective earth terminal, creating an optimized impedance path that reduces interference while ensuring safety. This approach is analyzed within a proposed Analog Audio Interconnection System (AAIS) framework. Experimental results show that common-mode voltages from protective earth potential differences are the primary source of interference. The optimized AISAAI suppressor achieves a consistent 15–30 dB reduction in measured audio interference across the audio band, regardless of the interconnect cable characteristics. This study confirms AISAAI as an effective solution for reducing ground loop noise in unbalanced audio systems and underlines the usefulness of the AAIS model for systemic analysis.

Ključne riječi

audio interference; EMI suppression; ground loops; unbalanced interconnects; analog audio systems; AISAAI suppressor