SU1427554A1 - Random signal generator - Google Patents

Abstract

The invention relates to radio engineering and communications. The purpose of the invention is to increase the power spectral density in the low frequency range,; Hr contains a source of white noise I noise multivibrator (FM) 2 with deadband, a peak detector (PD) with a reset, low-pass filter 4 and comparator 5. Comparator 5 generates a control signal for FM 2, which generates a reset pulse for the storage capacity of PD 3 , At the output of PD 3 a sequence of pulses is formed with a random amplitude and duration. As a result of discrete nonlinear conversion, a change in the spectrum of the T1-band random signal takes place, and the spectrum is 1 / f, i.e. there is a redistribution of the energy of the spectrum in the low frequency range. The goal is achieved by the introduction of the comparator 5. 2 kP. with o (L

Description

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The invention relates to radio engineering and communications, measurement technology, and can be used in statistical tests and researches of systems for various purposes.

The purpose of the invention is to increase the spectral density: power in the low frequency range.

FIG. 1 shows a structural electrical circuit of a random signal generator; FIG. 2a, b, in the timing diagrams of the random signal generator.

The random signal generator contains a white noise source 1, a waiting multivibrator 2 with deadband, a peak detector 3 with a reset, a low-pass filter 4 and a comparator 5.

The random signal generator works as follows.

The voltage at the output of the peak detector 3 always corresponds to the voltage of the maximum emit of the broadband source 1 of white noise at a certain time interval, and this interval is longer than the correlation time of the source I of white noise. At the output of the comparator 5, there is no signal until such an voltage surge at the input of the peak detector 3 is greater than or equal to the voltage at the output of the peak detector 3 (Fig. 2a). In this case, the comparator 5 generates a control signal (Fig. 2b), the waiting multivibrator 2 generates a reset pulse for the storage capacitance of the peak detector 3. The reset pulse duration is chosen longer than the discharge time of the storage capacitance of the peak detector 3. After the formation of the reset pulse, the waiting multivibrator 2 turns out

insensitive to signals from the output of the comparator 5 during the time interval exceeding the interval

the correlation of the white noise source 1 (Fig. 26). Then the control pulse generation process is repeated. Then, at the output of the peak detector 3, a sequence is formed

impulses with random amplitude and duration (Fig. 2c). As a result of this discrete non-pinwise transformation, a change in the spectrum of the wideband random signal takes place, and in this case the spectrum of the random signal at the output of the peak detector 3 has the form l / f, T.e. there is a redistribution of the energy of the spectrum in the range

low frequencies. At the same time, the output of the low-pass filter 4 increases the spectral power density of the random signal.

Claims (1)

Formula of gain A random signal generator containing a series-connected white noise source, a peak detector with a reset and a low-pass filter, an IC generator, the output of which is connected to the control input of the Pisa detector with a reset, while the output of the low-pass filter is the output of a random signal generator, This is due to the fact that, in order to increase the spectral power density in the low-frequency range, a comparator has been entered into it, the first and second inputs of the comparator are connected respectively to the input and output of the peak detector with a reset, and the pulse generator is implemented as a waiting 1 (ultravibrator with deadband, the control input of which is connected to the output of the comparator).