Block diagram of the measurement setup. The cuda based measurement server samples the data and calculates all necessary moments, while the measurement client performs longtime average and analysis.
(Color online) TWO-DIMENSIONAL frequency correlation spectrum of signals from terrestrial radio channels. (a) Full spectrum for frequencies from 0 to 90 MHz. (b) Magnification of the rectangle in (a) shows distinct radio channels. The fine structure of the channel at 80.8 MHz (arrow) is shown in Fig. 3.
(Color online) (a) Power spectrum of a terrestrial radio signal at 80.8 MHz. The pilot signal at 80.8 MHz ±19 kHz which is used for stereo transmission is clearly visible (FM multiplex technique). (b) The correlation spectrum of the same signal exhibits a strong anticorrelation (off-diagonal) at the off-diagonal and an increased correlation (diagonal) at the diagonal due to the frequency modulation technique.
(Color online) (a) Measurement circuit for voltage noise X(t) across carbon resistors and with bias voltage . (b) Power spectrum showing white thermal Johnson–Nyquist noise for zero bias and an additional 1/f contribution for a 9 V bias voltage (full spectrum). The difference of both curves reveals the typical 1/f spectrum (excess noise). (c) The normalized correlation spectrum is close to zero for the off-diagonal values as expected for purely Gaussian behavior.
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