FIR filter multiplexing system

Abstract

The invention discloses an FIR (Finite Impulse Response) filter multiplexing system. The FIR filter multiplexing system comprises a filter type selection module and a filter function implementation module, the filter function implementation module comprises a read-write control sub-module, a filtering calculation sub-module, a data buffer and a filter coefficient memory; the FIR filter multiplexing system can be compatible with a half-band filter and a non-half-band filter at the same time, and two different types of filters, namely the half-band filter and the non-half-band filter, are integrated in one system by using a selection module; therefore, the related counting parameters can be selected to implement the decimation filtering function of the filters of the corresponding types on the input data, so that the FIR filter multiplexing system forms a filter system with relatively high universality.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to an FIR filter multiplexing system based on different types of double decimation. Background technique [0002] Digital down-conversion is widely used in the field of wireless communication. The function is to down-convert or analog-to-digital convert the RF / analog front-end signal to obtain a baseband signal with a relatively low frequency, and then filter the baseband signal to obtain a low sampling rate and Signals with high signal quality are used for decoding and adaptive processing in audio or other fields. And a key filter used in this is called a digital filter, a device composed of a digital multiplier, an adder, and a delay unit. It is actually a digital signal processor, which is a discrete-time system. Its function It is to process the digital code of the input discrete signal to achieve the purpose of changing the signal spectrum. [0003] Among th...

AI Technical Summary

Problems solved by technology

[0004] In some design scenarios, if you need to set the stop band suppression unchanged or achieve higher data resolution and selectivity in the process of decimation and filtering, if you choose a single FIR filter to achieve, then you need to set the FIR filter The order is set to be very high, resulting in a substantial increase in the cost of circuit production design; the existing technology will also choose multiple FIR filters of the same type to be cascaded to achieve the same purpose, and the hardware resources such as multipliers and adders are required. The overhead is greatly increased, and the amount of calculation generated in the process of extraction and filtering is also large, which makes it difficult to meet the requirements of data access speed

Images