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A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
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Audio Interference Suppressor in Analog Audio Interface.

Vladimir Olujić1, Siniša Fajt1, Vlado Sruk1

  • 1University of Zagreb Faculty of Electrical Engineering and Computing, Unska 3, 10000 Zagreb, Croatia.

Sensors (Basel, Switzerland)
|September 27, 2025
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Summary

Ground loop interference causes hum and noise in unbalanced audio systems. A novel passive Audio Interference Suppressor in Analog Audio Interface (AISAAI) effectively reduces this interference by 15-30 dB.

Keywords:
AISAAI suppressorEMI suppressionanalog audio systemsaudio interferenceground loopsunbalanced interconnects

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Area of Science:

  • Electrical Engineering
  • Audio Engineering
  • Signal Processing

Background:

  • Unbalanced audio systems are prone to ground loop interference, resulting in audible hum and noise.
  • This interference often stems from differences in electrical potential between ground points.

Purpose of the Study:

  • To introduce and evaluate a novel passive Audio Interference Suppressor in Analog Audio Interface (AISAAI).
  • To analyze the effectiveness of AISAAI in mitigating ground loop noise within an Analog Audio Interconnection System (AAIS) framework.

Main Methods:

  • Developed a passive AISAAI circuit inserted between the audio device's rectifier ground and protective earth terminal.
  • Analyzed the circuit's performance within a proposed AAIS model.
  • Conducted experimental measurements of audio interference reduction.

Main Results:

  • Identified common-mode voltages from protective earth potential differences as the primary interference source.
  • Achieved a consistent 15-30 dB reduction in audio interference across the audio band with AISAAI.
  • Demonstrated consistent performance regardless of interconnect cable characteristics.

Conclusions:

  • AISAAI is confirmed as an effective solution for reducing ground loop noise in unbalanced audio systems.
  • The proposed AAIS model is useful for systemic analysis of audio interconnection issues.