Digital signal processor (DSP)-based 1/f alpha noise generator

Robert Mingesz; Peter Bara; Zoltan Gingl; Peter Makra

doi:10.1117/12.547110

25 May 2004 Digital signal processor (DSP)-based 1/f^α noise generator

Robert Mingesz, Peter Bara, Zoltan Gingl, Peter Makra

Proceedings Volume 5473, Noise in Communication; (2004) https://doi.org/10.1117/12.547110
Event: Second International Symposium on Fluctuations and Noise, 2004, Maspalomas, Gran Canaria Island, Spain

Abstract

1/f noise is present in several natural and artificial systems, and even though it was discovered several years ago, it is still not completely understood. Due to the lack of an universal model, the main methods of investigating a system where 1/f noise is present are numerical simulations and real measurements. The second method can lead to more adequate results, since it is free from numerical artifacts. In the case of real measurements, we need reliable, wide-band noise generators. Many ways of generating noise are known; most of them have several limitations on the frequency bandwidth or on spectral properties. We wanted to create a device which is easy to use, which can generate any kind of 1/f^α noise and whose bandwidth is wide enough to make our investigations. We used a DSP (ADSP2181) to numerically generate the desired noise, and a D/A converter to convert it to an analogue signal. The noise generation algorithm was based on the known method of filtering a Gaussian white noise with a series of first-order digital filters. We enhanced this method to get a better spectral shape and to compensate for the side effects of the digital-to-analogue conversion.

Citation Download Citation

Robert Mingesz, Peter Bara, Zoltan Gingl, and Peter Makra "Digital signal processor (DSP)-based 1/f^α noise generator", Proc. SPIE 5473, Noise in Communication, (25 May 2004); https://doi.org/10.1117/12.547110

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