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Digitale aktive Geräuschunterdrückung mit geringer Latenz

Authors Teschinegg, G.
Year 2012
Thesis Type Diploma thesis
Topic Audio Signal Processing
Keywords acoustics, Hardware
Abstract Analog active noise cancellation headphones in their vast styles and designs are well established on the commercial market. These headphones are built in order to cancel low frequencies that are hard to absorb. The low frequency noise is cancelled with 'anti-noise' of the same amplitude but opposite sign. Analog systems however are structurally limited in their effectiveness. These limits could possibly be amended by digital signal processing. The basic requirement for this solution is a digital system that has very low latency. For that reason it is necessary to use a powerful microprocessor and fast analog-digital as well as digital-analog converters. This thesis is concerned with the realization of a digital noise cancellation system for headphones. Powerful analog-digital and digital-analog converters are combined with a DSP-system and consequently two different noise cancellation methods that are based on an LMS algorithm are tested. The thesis analyzes the possibility of digital active noise cancellation and compares its performance with analog systems.
Supervisors Flock, M., Sontacchi, A., Magnes, W., Fischer, D.