Dynamic and variable time constant filter and filtering method

Abstract

The invention provides a dynamic and variable time constant filter and a filtering method, belonging to the technical field of electronic circuits and aiming to compromise the contradiction between rapid response and low noise in the choosing of time constant of a filter. The filter comprises a rapidly responding filter and a slowly responding filter as well as a weight changeable synthesizer in connection with both the rapidly responding filter and the slowly responding filter. The method is performed as follows. Inputting signals are inputted simultaneously into the rapidly responding filter and the slowly responding filter where they will be processed respectively. The outputted signals from the rapidly responding filter and the slowly responding filter are then inputted simultaneously into the weight changeable synthesizer. The weight changeable synthesizer divides the outputted signals from the rapidly responding filter and the slowly responding filter by corresponding weight coefficients and then synthesizes and outputs them. According to the invention, the signals with weight coefficients can effectively control the responding time constant of a filter, and during the adjustment process of the time constant, the outputting remains stable, free from sudden fluctuations.

Description

【Technical field】 [0001] The invention relates to the field of electronic circuits, in particular to a dynamic variable time constant filter and a filtering method. 【Background technique】 [0002] At present, the encoder is widely used in servo motors, intelligent robots, CNC machine tools and other fields. It is a precision measuring device that converts angular displacement or linear displacement into electrical signals. The former is called a code disc, and the latter is called a yardstick. According to the readout method, the encoder can be divided into two types: contact type and non-contact type; according to the working principle, the encoder can be divided into two types: incremental type and absolute type. The incremental encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and uses the number of pulses to represent the magnitude of the displacement. Each position of the absolute encoder...

AI Technical Summary

Problems solved by technology

However, the reference of the filter will slow down the output response speed of the encoder, and in a high-speed motion system, the control accuracy will decrease.

[0008] Therefore, the time constant selection of the output filter becomes very difficult and sensitive

If the time constant is too small, noise cannot be filtered out; if the time constant is too large, it will affect the response speed

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