Key result
Demodulated tremor signal-to-noise ratio is proportional to carrying noise bandwidth and squared modulation depth.
Why the study?
A mathematical description and evaluation of amplitude modulated noise demodulation for pathological tremor EMG signals was needed to understand signal-to-noise characteristics.
A mathematical model of amplitude modulated noise demodulation for tremor EMGs aligns with experimental results, showing SNR depends on carrying noise bandwidth and modulation depth.
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Model refines tremor EMG signal analysis; leaves open clinical translation pending prospective validation.
H. L. Journée (1983) studied Pathological tremor. Demodulator for pathological tremor EMGs vs. Mathematical formulas was evaluated on Signal-to-noise ratio of the tremor signal with respect to the demodulation noise. The signal-to-noise ratio of the demodulated signal is proportional to the bandwidth of the carrying noise and, for small modulation depths, to the square of the modulation depth.
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