A Digital Filter Circuit Applied in Long Line Transmission System

Abstract

The invention provides a digital filtering circuit applied to a long-distance transmission system. The digital filtering circuit comprises a signal shaping circuit, a pulse width recognition circuit, a time delay circuit, a trigger circuit and a logic output circuit, wherein the signal shaping circuit is used for finishing shaping processing of a distorted signal DI obtained after long-distance transmission; the pulse width recognition circuit is connected with the signal shaping circuit and used for filtering out pulse signals with pulse widths smaller than T from the signal DI and outputting signals with pulse widths larger than T; the time delay circuit is connected with the signal shaping circuit, and an output signal serves as an enable signal of the trigger circuit; the trigger circuit is connected with the pulse width recognition circuit and the time delay circuit respectively and used for recording an end moment of the signal DI; the logic output circuit is connected with the signal shaping circuit and the trigger circuit respectively and used for recording the starting moment and the end moment of the signal DI and outputting fidelity information of the output signal DI. The digital filtering circuit effectively eliminates an interference phenomenon in the long-distance signal transmission process, fidelity transmission of the signal is realized, the digital filtering circuit is simple in structure and easy to use and facilitates integration of the system, and the cost of the long-distance transmission communication system is greatly reduced.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a digital filter circuit inside the integrated circuit used in long-line transmission systems. Background technique [0002] Due to the existence of non-ideal factors such as distributed resistance, the signal in the long-line transmission system has serious interference, which affects the information integrity of the transmitted signal. Therefore, how to eliminate the signal distortion caused by non-ideal factors in this long-line transmission system has become a problem that cannot be ignored in the current signal transmission network. [0003] At present, commonly used measures to deal with long-term transmission signal interference include: impedance matching technology, isolation technology, etc. Among them, the impedance matching technology is to adjust the impedance of the signal sending end and the receiving end to match the impedance of the two, so as to reduce ...

AI Technical Summary

Problems solved by technology

Although the effectiveness of these two types of processing signal interference measures in long-line transmission systems has been tested in production practice, there are still deficiencies

With the increasing complexity of the signal transmission system, the diversity and variability of the impedance network pose challenges to the realization of impedance matching technology; and the adoption of technologies such as photoelectric isolation and relay isolation not only increases the system cost, but also hinders system integration. realization of

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