The method of transfer and recognition of binary information

 

The invention relates to techniques for telecommunication, in particular to the transmission and reception of binary information. The technical result is to simplify the method of transfer and recognition of binary information. The technical result is achieved in that on the transmission side to form a sequence of harmonic signals, characterizing value of the logical levels, transmit a sequence of data signals over the communication channel, at the receiver side the received signal is subjected to analog-to-digital conversion and educated array of digital reports recognize the accepted sequence data, and when detecting the received sequence data record of the first transition of the received signal through the zero level and begin to determine the average value of this signal, also compare the values of samples of the received signal and the average value of the periods of the signal, which make the transfer of logical levels, determine the moment of maximum proximity of the received signal and its average value found time interval between the first transition of the received signal and its average value is considered as the period of the signal is of such levels, and judge the value of a received logic level. 2 Il., table 1.

The invention relates to electrical engineering, in particular to telecommunications, and may be used in systems of remote control and alarm systems, namely the systems of transmission and reception of binary data.

In the information transmission through a noisy communication lines there is a need to increase the validity of received data with minimal computational cost. Therefore, the problem of reliable and fast detection of the adopted binary information is relevant.

There is a method of transfer and recognition of binary information (Karimov R. N. , Katz E. J., Chervyakova O. C. Quick algorithm for detecting signals of a given frequency in the communication lines.//Interuniversity collection of scientific works: - Saratov, 1998. - S. 52-59. ), which is selected as a prototype. The known method is that when the transfer logic level serial data stream on the transmission side with generators, built using quartz resonators form a serial stream of harmonic signals with frequencies of 30 kHz for the transmission of a logical "l" and 20 kHz for the transmission of a logical "0". The generated flow garoowe-digital Converter (ADC) and educated array of digital samples to recognize one of the high-frequency components, namely, a signal with a frequency of 30 kHz.

The disadvantages of this method are: the need to use quartz resonators in the formation of the harmonic signals; the need for a sufficiently large length implementation of the analyzed harmonic signal (5 periods) when recognizing a significant dependence on the established frequency for transmission to the logic levels and the binding of these frequencies to a specific range.

The task of the invention is to simplify the method of transfer and recognition of binary information.

This object is achieved in that in the method of transfer and recognition of binary information as the prototype for transmission of serial data stream on the transmission side to form a sequence of harmonic signals, characterizing value of the logical levels. This sequence is passed over the communication channel. At the receiving side, the received signal is subjected to analog-to-digital conversion and educated array of digital samples to recognize the accepted sequence data.

According to the invention in contrast to the prototype when detecting binary information comprising an array of digital reference is regulate the average value of this signal. Simultaneously, comparing the values of samples of the received signal and its average value in the area known values of the periods of the signals, which make the transfer of logical levels, determine the moment of maximum proximity of the received signal and its average value in the range of half the sampling period of the received signal. The time interval between the first transition of the received signal through the zero level and maximum proximity of the received signal and its average value in the range of half the sampling period of the received signal is considered as the period of the signal T_with. In case of equality of T_withthe period of the signal, which was formed in the transmission of a logical "l", get the result of the adoption of logical "l". In case of equality of T_withthe period of the signal, which was formed in the transmission of a logical "0", receive a result of the adoption of a logical "0".

The first transition of the received signal through the zero level allows to take into account the influence of the phase shift of this signal. Due to the fact that the definition of T_withproduced in the area known values of the periods of the signals, by which the produce before, is using only two memory cells for storing the current samples of the received signal and its average value. Recognition logic level by determining the value of the period of the received signal on the basis of the analysis of the signal and its average value was able to handle signals with a high level of noise when a possible deviation of the frequency of the harmonic signals up to 10% of the nominal frequency during their formation.

The proposed method for the transfer and recognition of binary information has a number of advantages, which are expressed in what appears fast to handle the received harmonic signals in real time without requiring a large number of memory cells, the deviation of the frequency of the harmonic signals up to 10% of the nominal frequency in their formation, as well as the opportunity to handle signals with a DC component, any phase shift and a high level of noise.

In Fig. 1 shows a block diagram of the proposed method transfer and recognition of binary information.

In Fig. 2 shows graphs of changes over time of the signal (2) U_i(curve 1) and the average value of Y_i(curve 2).

In the tables the I binary information is implemented using structural diagram (Fig. 1) containing the encoder 1, the first inlet of which a serial stream of binary data, x(t), the generators 2 and 3, the outputs of which are connected with the second and third inputs of the encoder, analog-to-digital Converter 4 (ADC), whose input is connected via a communication line with the output of the encoder 1, the device for determination of period 5, the input connected to the output of the ADC 4, and the output - input output device data 6.

As generators 2 and 3 can be used generators series HA-117, GZ-105 or EZ-106, or they can be collected on the logic chip series 176, 561 or similar series. The encoder 1 may be selected from 1561 or a similar series of integrated circuits. As ADC 4 you can use the Converter CPU or similar. Device for determination of the period of the signal 5 and the output device 6 may be implemented on the basis of microprocessor CRUM or equivalent.

The serial binary data stream x(t) is supplied to the encoder 1, which by means of frequency generators 2 and 3 generates a sequence of harmonic signals u(t), the frequency of which correspond to the transmitted logical levels. The flow of harmonic signals transmitted by the one taken from the line signal u'(t), processed through ADC 4. By educated array of digital samples using a device definition period 5 determine the period of the signal T_withthe points of intersection of the signal from its mean value. When this is fixed the first transition of the considered signal through the zero level and, from this point of time t_beg, the computation of the average value of Y_ithis signal in each i-th point in timewhere U_i- the current count of received signal.

At the same time, knowing the values of the periods of the signals characterizing the transmitted logic levels, calculate T_cin the expected region. If, for transmission to the logical levels to use harmonic signals u(t)=100sin(22000+53^o); (2) u(t)=100sin(23000+53^o), (3) the periods of these signals is respectively 510^-5and 3.3310^-5C. From this it follows that the expected region for these signals can nachinat the the graphs of changes over time of the signal (2) and its average value, where curve 1 describes the change of the signal U_iand curve 2 describes the change in the average value of Y_ithis signal.

During the determination of Y_istarting from some point in time, describing the beginning of the expected area, determine the point of intersection of the curve Y_iwith U_i. This procedure is carried out through comparisons of the values of the counts array Y_iand U_iin accordance with the following algorithm: 1) fixed the sign of the signal U_iat time t_beg+10i.e. determine increases or decreases the curve of the signal in the expected region of intersection; 2) if the curve of the signal U_iincreases in the expected region of intersection, the point of intersection of the curves Y_iand U_idetermine the torque value is exceeded, the current reference signal U_iin relation to the value of the current reference signal Y_i; 3) if the curve of the signal U_idecreases in the expected region of intersection, the point of intersection of the curves Y_iand U_idetermine the torque value is exceeded, the current reference signal Y_iin relation to the value of the current reference signal U_i.

Table presechenie signal (2) with its average value occurs at time t=6,810^-5C. the period of this signal will amount to 6.810^-5-1,810^-5=510^-5C. For signal (3) the point of intersection with its average value falls at the time t= 4,510^-5C. the Period of this signal will be 4.510^-5-1,210^-5=3.3V10^-5C.

The range of frequencies of signals (2) and (3) allows the deviation of the frequency of these signals up to 10% of nominal, therefore, can be reduced demands on the stability of the frequencies of the harmonic signals in their formation.

After determining T_cthe output device 6 displays the result on the adoption of a logical "1" when the equality T_cthe period of the signal, which was formed in the transmission of a logical "1". If T_cequal to the period of the signal, which was formed in the transmission of a logical "0", the output device 6 produces the result on the adoption of a logical "0". The error in determining the period of a received signal can be up to 10% from the nominal value that will not affect the accuracy of the received logic level.

So arr values of the frequency of transmitted signals and to process the entire array of samples, characterizing the serial data stream, as well as the possibility of fast processing of the received harmonic signals in real-time with a constant component, any phase shift and a high level of noise, which does not require a large number of memory cells and allowing the frequency deviation of the harmonic signals up to 10% of the nominal frequency during their formation, which simplifies the process of transfer and recognition of binary information.

Claims

The method of transfer and recognition of binary information, namely, that the transmission of the serial data stream on the transmission side to form a sequence of harmonic signals, characterizing value of the logical levels, transmit a sequence of data signals over the communication channel, at the receiver side the received signal is subjected to analog-to-digital conversion and educated array of digital reports recognize the accepted sequence data, wherein when recognizing the received sequence data record of the first transition of the received signal through the zero level, and from that time begin to determine the average value within the range of known values of periods of the signal, with the help of which make the transfer of logical levels, determine the moment of maximum proximity of the received signal and its average value in the range of half the sampling period of the received signal, the value found time interval between the first transition of the received signal through the zero level and maximum proximity of the received signal and its average value in the range of half the sampling period of the received signal is considered as the period of the signal T_cif the equality T_cthe period of the signal, which was formed in the transmission of a logical "1", receive a result of the adoption of a logical "1" when the equality T_cthe period of the signal, which was formed in the transmission of a logical "0", receive a result of the adoption of a logical "0".