General programmable digital filter and its working method

Abstract

The invention discloses a general purpose programmable digit filter and working method, which is characterized by the following: the invention is composed of 9 functional modulars; the working methodconsists of two working methods: allocation method and filtering duty; the invention improves the stability, anti-interference ability and accuracy and avoids internal noise of electric filter systemeffecting the filtering signal; the invention uses many hardware multiplicators and accumulators to realize filtering calculation, which improves the response real-time ability.

Description

technical field [0001] The invention relates to a filter and a control method thereof, in particular to a general programmable digital filter device and a control method thereof. Background technique [0002] A filter is an electronic device that can pass useful signals smoothly while suppressing (or attenuating) unwanted frequency signals. It is commonly used in engineering for signal processing, data transmission and interference suppression. In measurement and communication systems, a filter is essentially an electronic device that can extract the information carried by the original signal from a signal that has been distorted and polluted by noise. [0003] Filters can be divided into analog filters and digital filters. [0004] An analog filter can be defined as an electronic device that is mainly composed of analog components and performs analog calculations on analog signals to complete signal filtering and processing functions. [0005] In contrast, a digital filt...

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Problems solved by technology

[0012] However, at present, the digital filter is mainly implemented by software on the DSP platform. As the order of the filter increases, the more resources the DSP processor needs to be occupied, the longer the processing time and the faster the processing speed. It is not as good as an analog filter. At the same time, digital filtering is only a link in digital signal processing, and the DSP processor also needs to perform other processing operations on the filtered data. When the system has high real-time requirements or a large amount of calculation, For example, it is required to capture some instantaneous signals and respond in time, or to perform multi-point FFT operations, wavelet transform, and multi-channel real-time communication processing, etc., the real-time performance cannot be guaranteed, and it is often necessary to add another processor to the system. To meet the system requirements. This not only increases the design cost of the system, but also makes the board-level design and verification of the system more complicated. Although, some ASIC (application-specific integrated circuit) chips have dedicated hardware digital filters inside, which can solve the problem of Real-time problem, but it can only be applied to specialized fields, lacks versatility, and is expensive.

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