Knock By Decimation Filter Coefficients

This block provides a convenient way for filter coefficients associated with a Knock System by Decimation to be declared. The block is designed to be used inconjunction with the Knock Decimation Coefficient Set block.

Block ID

Knock Decimation IIR Filter Coefficients

Library

motohawk_knock_by_decimation_lib

Description

Signals

Coefficients

The decimation coefficients are implemented as cascadable 4th order IIR filters. A base coefficient set is described as a 9x1 vector of int32 values. They have a fixed point representation such that 1.0 is described by the value of 83688608. The filter has the following form.

This block can be connected directly to the Knock Decimation Coefficient Set block.

Block Parameters

Parameter Field	Values	Comments/Description
Name	Unique C-legal Alpha-numeric text, quote enclosed	Name of the coefficient array. An error will result under the mask of this block if the name is not unique.
Coefficients	Reals	Filter values arranged per the above figure.
IIR Filter Order	Drop down list	Defines the filter order that is to be defined. This will size the output.
Scale	Drop down list	The decimation system internally scales its values using the supplied scaling. All coefficients should fall into the range -Scale < coefficient < Scale.