Method and system of filtering polyphased data

摘要

Polyphased input data is filtered. A number of delay lines are provided corresponding to the number of polyphases. Each delay lines stores a set of input data samples. Filter elements are provided for each delay line. The filter elements operate at a particular time on different subsets of the input data samples stored in the delay line. During a given time interval a number of new input data samples corresponding to the number of filter elements in the group of filter elements are shifted into the delay line. During a plurality of subintervals within the time interval, groups of filter coefficients are supplied to the group of filter elements. In each subinterval, all of the filter elements within the group receive the same set of filter coefficients, and output an output data sample. Output data samples from corresponding filter elements for different delay line are combined to produce filtered data.

主权项

1. A device for filtering polyphased input data having a plurality of polyphases, the device comprising:
a plurality of delay lines corresponding to the plurality of polyphases, where a delay line is configured to receive a set of the input data samples from the corresponding polyphase; a plurality of groups of filter elements corresponding to the plurality of delay lines and the plurality of polyphases,
wherein,
the filter elements with any one of the groups are configured to operate in parallel with each other on corresponding different subsets of the set of the input data samples for the corresponding delay line,the filter elements within said any one of the groups are configured to sequentially perform a plurality of filtering operations on the corresponding subsets of the set of the input data samples using a plurality of sets of filter coefficients which are sequentially received, each filter element providing an output data sample for each filtering operation, andthe filter elements within said any one of the groups are configured to employ a same set of filter coefficients as each other at a same time during the filtering operations; and a combiner for combining the output data samples from the groups of filter elements to produce filtered data, wherein the delay lines have lengths greater than a number of the input data samples in any one of the subsets.