A kind of multi-channel digital filter

Abstract

The invention relates to a multi-path digital filter. The multi-path digital filter comprises a parallel / serial converter, a filter module, a serial / parallel converter and a control module, wherein the parallel / serial converter, the filter module and the serial / parallel converter are connected in sequence; a plurality of paths of parallel data streams are input into the parallel / serial converter; the parallel / serial converter is used for converting the input plurality of paths of parallel data streams into one path of high-speed serial data stream; the filter module is a lattice filter module, and used for filtering the serial data stream; the serial / parallel converter is used for converting the filtered serial data stream into a plurality of paths of parallel data streams; and the control module is connected with the parallel / serial converter, the filter module and the serial / parallel converter, and used for generating a data selection signal and an address selection signal. The multi-path digital filter provided by the invention is based on a lattice structural design, so that deterioration of filtering performance due to rounding-off or truncation in an operation process of the digital filter is improved. In a system in which a same filter can be adopted for a plurality of data streams, the hardware overhead is saved through adoption of a multi-input multi-output design.

Description

technical field [0001] The invention relates to a multi-channel digital filter. Background technique [0002] Digital filter is a commonly used device in digital signal processing. It can be divided into two types: FIR (finite impulse response) and IIR (infinite impulse response), and there are various network structures, such as direct type, cascade type, etc., among which A filter with a new lattice structure has the following characteristics: (1) the modular structure facilitates high-speed parallel processing; (2) an n-order lattice filter can generate n The output performance of the transversal filter; (3) insensitive to the rounding error of the limited word length. Because of these advantages, it has been widely used in digital filters. [0003] At present, the problems existing in the digital filter based on the circuit can be attributed to two categories, one is the effective word length effect, because the relevant parameters of the digital filter and the results...

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Problems solved by technology

[0003] At present, the problems existing in the digital filter based on the circuit can be attributed to two categories, one is the effective word length effect, because the relevant parameters of the digital filter and the results of the operation process must be stored in a finite storage unit, There is an error between the filter realized by the circuit and the ideal filter, which affects the filtering performance

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