Improved real-time method for noise reduction of directional Doppler audio signals
by Erdenedalai Naranchimeg; Byambasuren Bat-Erdene; Seung-Moo Han
International Journal of Biomedical Engineering and Technology (IJBET), Vol. 10, No. 2, 2012

Abstract: A noise reduction filter for Doppler audio signals is one important part of Transcranial Doppler ultrasound system. Several studies have been carried out for low-pass filter with fixed value for Doppler audio signals; however, most of these studies lacked complex research works and few studies analyzed the relationship of both parts of spectrum signal processing and audio signal processing. To solve the above-mentioned concern, this research is focused on the algorithms of de-noising and enveloping of spectrum signal processing part and improved new real-time method, which reduces the noise using low-pass filter with a variable threshold value based on maximum frequency of spectrum signals. The noise of Doppler audio signals was reduced efficiently by using this algorithm.

Online publication date: Fri, 12-Dec-2014

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