Simplified signal processing for impedance spectroscopy with spectrally sparse sequences
| العنوان: | Simplified signal processing for impedance spectroscopy with spectrally sparse sequences |
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| المؤلفون: | Yar M. Mughal, Jaan Ojarand, Paul Annus, Mart Min, Raul Land, Marko Reidla |
| المصدر: | Journal of Physics: Conference Series. 434:012031 |
| بيانات النشر: | IOP Publishing, 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | History, Signal processing, Low-pass filter, Fast Fourier transform, Computer Science Applications, Education, Multidimensional signal processing, symbols.namesake, Fourier transform, Electronic engineering, symbols, Demodulation, Waveform, Crest factor, Mathematics |
| الوصف: | Classical method for measurement of the electrical bio-impedance involves excitation with sinusoidal waveform. Sinusoidal excitation at fixed frequency points enables wide variety of signal processing options, most general of them being Fourier transform. Multiplication with two quadrature waveforms at desired frequency could be easily accomplished both in analogue and in digital domains, even simplest quadrature square waves can be considered, which reduces signal processing task in analogue domain to synchronous switching followed by low pass filter, and in digital domain requires only additions. So called spectrally sparse excitation sequences (SSS), which have been recently introduced into bio-impedance measurement domain, are very reasonable choice when simultaneous multifrequency excitation is required. They have many good properties, such as ease of generation and good crest factor compared to similar multisinusoids. Typically, the usage of discrete or fast Fourier transform in signal processing step is considered so far. Usage of simplified methods nevertheless would reduce computational burden, and enable simpler, less costly and less energy hungry signal processing platforms. Accuracy of the measurement with SSS excitation when using different waveforms for quadrature demodulation will be compared in order to evaluate the feasibility of the simplified signal processing. Sigma delta modulated sinusoid (binary signal) is considered to be a good alternative for a synchronous demodulation. |
| تدمد: | 1742-6596 1742-6588 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::b4364ed8a620d477917b492d13bd8550 https://doi.org/10.1088/1742-6596/434/1/012031 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........b4364ed8a620d477917b492d13bd8550 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17426596 17426588 |
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