Bit synchronization decoding method

Abstract

The invention provides a bit synchronization decoding method for a slave in a master-slave type DC carrier wave communication system. A central processor executes the bit synchronization decoding flow to decode a sampling sequence that: 1, the central processor monitors a falling edge signal, and starts a counter for counting; 2, the central processor monitors a rising edge signal, and reads and stores a count value in the counter, which is a low level width count value; 3, the central processor monitors the falling edge signal again, and stores the count value in the counter, which is a databit width count value; 4, the central processor calculates the high level width count value, and judges whether the relationship of the high level width count value and the low level width count value represents the data bit 0 or 1; and 5, finally, the central processor stores the decoding result, and receives and decodes the next data bit. By the technical proposal, the data transmitted to the slave can be accurately decoded; and in the mode of setting the starting information of the receive data, the accuracy of the data decoding caused when the clock frequency of the slave is unstable is improved.

Description

technical field [0001] The invention relates to the field of DC carrier communication, in particular to a decoding method in a master-slave DC carrier communication system. Background technique [0002] In communication systems such as electronic detonator networks and intelligent sensor networks, the energy required to maintain the slaves of each node is small, which makes it easier for the host to directly provide working power to the slaves, and is conducive to network maintenance. In addition, in the communication system of the above-mentioned type, it is also required that the volume of the slave be as small as possible. Patent application document 200810172410.9 provides a master-slave DC carrier communication system, which provides a two-wire non-polarity-distinguished communication system that can perform simplex bidirectional data transmission while the master provides DC power to the slave. , which simplifies the design and connection of the master and slave to th...

AI Technical Summary

Problems solved by technology

[0005] 2. The crystal used in the crystal oscillator cannot be integrated into the control chip, which also increases the size and cost of the electronic detonator

[0010] When sending 01 data alternately, the Manchester encoding method will form continuous 0 or 1, for example, when sending "01", the actual sent data will be 0110 or 1001, which will cause the received data to lose the data bit start information, so there is a possibility of data decoding errors

In addition, during wired transmission, the capacitive and inductive reactance existing in the transmission line may cause waveform distortion

The change and inconsistency of the waveform edge also limit the application of the self-synchronization method of Manchester encoding in systems such as electronic detonators

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