Processing method of interference signals in decoding process of digital coder

Abstract

The invention discloses a processing method of interference signals in decoding process of a digital coder, which can effectively filter an interference signal with smaller width in pulse signals A and B by inducing one external clock signal the frequency of which is more than 3 times, but less than 10 times of the maximum frequency of the pulse signal A or B generated and outputted by the digitalcoder and taking the external clock signal as the clock signal of each-grade latch of a first digital filter and a second digital filter, and can guarantee not to change phase position factors of thepulse signals A and B; while for the interference signal with larger width, if the pulse signal B is high level when the pulse A is jumped from high level to lower level, then the attribute value isincreased by 1; however, if the pulse signal B is still high level when the interference signal stops and the pulse signal A is jumped from low level to high level, then the attribute value is reducedby 1, thus being capable of effectively eliminating the influences of the interference signal with larger width on the pulse signals, thereby leading a final attribute value to be more accurate.

Description

technical field [0001] The invention relates to a signal processing method, in particular to a method for processing interference signals in the decoding process of a digital encoder. Background technique [0002] In the industrial control process, the digital encoder (optical ruler) can convert the mechanical displacement into an electrical signal, and the digital encoder can be used to measure the length, angle, position or speed of the object. Due to the advantages of high measurement accuracy, good reliability, and wide application range, digital encoders are widely used in papermaking and printing machinery, testing instruments, automatic machinery, conveying systems, cranes, pressure control, test benches, antennas, textiles, etc. Machinery, speed feedback and other fields. [0003] The digital encoder converts the angular displacement or linear displacement into an electrical signal to generate two pulse signals containing phase, that is, pulse signal A containing ph...

AI Technical Summary

Problems solved by technology

[0004] In order to better filter out invalid interference signals in the signals received by the control equipment, the current common method is to use filters to filter the received signals, that is, to use two digital decoders in the process of decoding The filter performs analog or digital filtering on the pulse signal A and pulse signal B respectively. This method often changes the phase of the pulse signal or filters out the effective signal while filtering out the interference signal, which will make the decoding result of the decoder exist. Error; on the other hand, due to the change of the phase factor of the pulse signal, the decoder at the decoding end still counts some interferences with a relatively wide width as normal pulses, which will cause errors in the measurement results

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