| 摘要 |
FIELD: electric engineering. ^ SUBSTANCE: in the method binary data is formed in bursts of the same size, preset combination of bits that forms a header is added in the beginning of every burst, control combination of bits is calculated, as hash function from combination of bits of data and burst header, it is added to the end of burst, at occurrence of regular transfer interval, center of which is moment when main electric grid voltage harmonic passes through zero, for duration of this interval one of two sources of reference frequency sinusoidal voltage is connected to the grid, whenever regular reception interval comes, the center of which is the moment when the main electric grid voltage harmonic passes through zero, sent signals are received together with superposed noises, reference frequency voltage is separated with the help of filtration, divided into two channels, then in each channel difference frequency voltage is isolated with the help of filters, integrated for the time of reception interval duration, on completion of reception interval analog voltage is transformed at the outlet of every integrator into binary form, besides, after every shift, availability of header is checked in shift register of every channel, and control combination is calculated again by the same hash-function from sequence of received data burst bits, which was used in the process of transfer, if header and control combination in corresponding positions of shift register were detected, burst reception was completed, received data is selected from shift register of the channel where they were detected, otherwise, the next cycle of transfer-reception of regular bit is conducted. And device contains unit of synchronisation, microprocessor, coupling unit, unit of transistor switches, multipliers of signals of two identical reception channels, two low frequency filters, two integrators and two comparators. ^ EFFECT: simplicity and low cost of device implementation. ^ 4 cl, 8 dwg |
