SU1185623A1 - Information transmission device - Google Patents

Abstract

A DEVICE FOR TRANSFER OF INFORMATION, containing on the transmitting side a broadband noise generator, connected to the input of a bandpass filter, and the first message source, the output of which is connected to the control input on the frequency of a bandpass filter, and on the receiving side - serially connected input filter, detector and storage device, By the fact that, in order to improve throughput, the second and third sources of messages are entered on the transmitting side, the outputs of which are connected respectively to the generator input w rokopolosnogo noise and input control on the width of the strip passing the bandpass filter and the reception side administered serially connected unit normalization level and frequency discriminator noise signal and the spectral width discriminator noise signa-. la, whose input is connected to the output of the leveling unit.

Description

The invention relates to a technique for transmitting signals using radio engineering vibrations and can be used in designing information transmission means, mainly for short distances, as well as in information coding schemes and code conversion circuits, for example, in designing video pulse converters. radio pulse code and vice versa. The purpose of the invention is to increase the capacity, FIG. 1 is a structural electrical circuit diagram of the proposed device, FIG. 2 is a circuit diagram of a transmitter; in FIG. 26, c and graphs of spectra, explaining the operation of the transmitter; in FIG. Pros and b - structured electrical circuit of the discriminator of the frequency of the shzmovogo signal and frequency characteristics that explain the operation of the discriminator of the frequency i S; - {OBoro signal, in fig. 4a and b are the structural electrical circuit of the discriminator of the width of the spectrum of the noise signal and the frequency characteristics that explain the operation of the discriminator of the width of the spectrum of the noise signal. The device contains a transmitter 1, first, second and third sources 2 messages, information transmission line 3 and receiver 4. Transmitter 1 is designed as a spectral-controlled generator 5 of broadband noise, the output of which is connected to the input of a band-pass filter 6 frequency controlled and bandwidth "Receiver 4 contains an input filter 7, a detector 8, a drive 9, a level normalizing unit 10, a discriminator 11 of the frequency of the noise signal and a discriminator 12 of the spectrum width n of the mind signal. The device works as follows. Transmitter 1, depending on the control signals from the source of 2 messages, generates a noise signal at its output, the power, average frequency and spectral width of which depend on the levels of control signals of the sources of 2 messages. Transmitter 1 (Fig. 2a) is a semiconductor diode 13 operating in avalanche mode, and a band-pass filter 14 connected to its output. The control of the parameters of the band-pass filter 14 is not shown, the average frequency can be tuned by switching the varicap, and the bandwidth by connecting a controlled resistor, for example, in the form of a field-effect transistor. The spectral density of the generated noise is controlled by the generator 5 of the broadband puma by varying the avalanche current flowing through the semiconductor diode 13. The graphs of the spectra of the broadband noise of different spectral density, which in turn correspond to two levels of the input control signal 1a from the source 2 messages,. . presented in FIG. 26. ... The spectral plots differing in the average frequency, which corresponds to two levels of the control signal from the source of the 2 messages that modulate the noise signal at the center frequency, are shown in FIG. 26, and spectra plots differing in the width of the spectra of the noise signal, which corresponds to 1, and signal levels from the source of the 2 messages, modulating the noise signal over the width of the spectrum, in FIG. 2g. A characteristic feature of the modulation of the noise signal in the proposed structure in three parameters (frequency, center frequency and spectrum width) is that the shape of the spectrum does not change with power modulation, and the power and width do not change with frequency modulation of the noise signal spectrum, when modulated across the width of the spectrum, the power and average frequency of the noise signal do not change. Those. the structure provides independence (invariance) of the modulations by the three parameters of the noise signal, which ensures the transmission of information from three sources of 2 messages on one noise carrier —and results in compaction of line 3 and better use of line 3. The signal via line 3 (radio frequency) cable or space) is fed to the input of receiver 4. Input filter 7 provides filtering of incoming noise signal

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fishing from noise and interference. Detector 8 and accumulator 9 provide for the isolation of information embedded in changes in the power of the noise signal. Block 10 demodulates noise signal power, i.e. removes the modulation of the noise signal power, providing a noise signal of constant power at the input of the discriminators 11 and 12. The discriminator 11 responds to a change in the average frequency. (The structure and characteristics that explain its operation are shown in Fig. Pros, b).

The discriminator 11 of the frequency of the noise signal consists of two filter 15s that are out of alignment with respect to the average frequency, the outputs of which include the detectors 16 and the block 17 that subtracts the detected signals. If the average frequency of the noise signal is fp (Fig. 3), then the output voltage of the subtractor 17 is zero. When the average frequency of the noise signal deviates to the left or to the right of (, the output signal of the deduction block 17 changes its value and sign.

The discriminator 12 of the width of the spectrum of the noise signal is constructed similarly with the only difference that the parameters of the filters 15 differ in bandwidth. If the input noise signal coincides in shape with the frequency response of the filter 15 (f, D), then the output of the subtractor 17 will be the maximum signal, for example, of a positive polarity.

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If the input noise signal coincides in shape with the frequency response of the filter 15 (f, 2), then on you, during the subtraction block 17, there will be a maximal signal of negative polarity. The structure of the discriminator 12 operates at a constant average frequency of the noise signal. If the average frequency is modulated (more general case), then the discriminator 12

the width of the spectrum of the noise signal is built on the structure (Fig. 4c (), representing the serial connection of the nonlinear element 18

15, a band-pass filter 19, a detector 20, and an averaging unit 21 (frequency characteristics that explain the operation are shown in FIG. 4B).

0 Nonlinear element 18 converts the spectrum of the schm signal to zero frequencies. At the same time, the ordinate of the spectrum at a zero frequency has a constant value, since the power of the noise signal at the input of the discriminator 12 is kept constant, and the slope of the characteristic of the spectrum changes depending on the width of the spectrum of the noise signal. Therefore, in the band pass filter 19 there passes a greater or lesser part of the noise, which is recorded with the help of the detector 20 and the averaging link 21, i.e. output signal prop.

The national spectrum of the input noise signal is independent of its average frequency.

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Claims (1)

INFORMATION TRANSMISSION DEVICE, comprising on the transmitting side a broadband noise generator connected to the input of the band-pass filter, and a first message source whose output is connected to the control input on the frequency of the band-pass filter, and at the receiving side, series-connected input filter, detector and drive, different the fact that, in order to increase throughput, the second and third message sources are introduced on the transmitting side, the outputs of which are connected respectively to the input of the broadband generator noisy noise and the control input along the bandwidth of the band-pass filter, and on the receiving side, serially connected level normalization unit and a noise signal frequency discriminator, as well as a noise spectrum discriminator, the input of which is connected to the output of the normalization block level.