Method for improving decoding performance of B time code

Abstract

The invention provides a method for improving decoding performance of B time code and aims to provide a decoding method capable of obtaining stable time information when the quality of an outer B timecode signal is poor. According to the technical scheme, the method comprises the following steps: a first-stage B time code decoder decodes an externally input B code; the time information output through decoding is converted into a BCD code format in a BCD code converter; a correction reference time information is provided for the inner B time code encoder through a timing controller; a signal locking and judging module is used for judging the locking state of the current outer B time code through calculation according to the outer time information and the second pulse information output bythe first-stage B time code decoder; the timing controller is triggered by the periodic timing pulse generated by a timer and periodically corrects the time deviation between the inner B time code encoder and the outer B time code according to the locking decision instruction of the outer B time code and the time information of the BCD code format; the inner B code encoder generates an inner B time code under the driving of a local system clock to obtain final output time information.

Description

Technical field [0001] The invention relates to a method for decoding B time code when the signal quality is not good in test equipment such as measurement, control, calculation, communication, meteorology, etc., and in many fields such as commerce and industry. Background technique [0002] IRIG-B format time code, abbreviated as B code, is the international universal time format code. The time synchronization used in each system has the characteristics of easy transmission, standardized interface, and international usage. [0003] The IRIG-B time code format is a time string code of one frame per second, each symbol has a width of 10 ms, and a time frame period includes 100 symbols. The "punctual" reference point of a symbol is the leading edge of its pulse. The reference mark of the time frame is composed of a position identification mark and adjacent reference symbols, and its width is 8ms; every 10 symbols has a position identification mark: P1, P2, P3,..., P9, P10, they are ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to aim at the deficiencies of the above-mentioned traditional B time code decoding circuit, to provide a kind of resource occupation cost is small, can improve the method of IRIG-B code time synchronization accuracy and reliability, when the B time code signal quality is poor, Accurate time information can be obtained stably even in case of occasional signal interruption

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