To obtain the coefficient value matrix Transforma​​tionDelay​M​atrix2 for for a method of a class definition NewtonRateConverter

I have tried to defined a class definition

classdef (StrictDefaults)NewtonRateConverter< dsp.FarrowRateConverter &...

dsp.internal.SupportScalarVarSize & ...

dsp.internal.MultirateEngine &...

dsp.internal.FilterAnalysisMultirate

%Constructor

methods

function obj = NewtonRateConverter(varargin)

% Constructor for the NewtonRateConverter class

setProperties(obj, nargin, varargin{:}, ...

'InputSampleRate', ...

'OutputSampleRate', ...

'OutputRateTolerance', ...

'PolynomialOrder');

end

end

basically it overrides the Farrow Rate Converter and introduce certain conversions over it .

Now for it two Transformation Delay Matrices Td2 are required.Mathematically Td2

M is the Polynomial Order

So I created function file for Td2

function Td2 = compute_Td2(M)

% Initialize Td2 with identity

Td2 = eye(M+1);

for n = 2:M+1

for k = 2:n-1

Td2(n, k) = Td2(n-1, k-1) - (n-2) * Td2(n-1, k);

end

end

Td2 = Td2(2:M+1, 2:M+1);

end

This I defined this as a static method in NewtonRateConverter

>> compute_Td2(3)

ans =

1 0 0

-1 1 0

2 -3 1

>> compute_Td2(5)

ans =

1 0 0 0 0

-1 1 0 0 0

2 -3 1 0 0

-6 11 -6 1 0

24 -50 35 -10 1

I entered this as a function as a property and method in this class definition NewtonRateConverter

properties

TransformationDelayMatrix2

end

methods

function computeTransformationDelayMatrix2(obj)

% Access PolynomialOrder from superclass

M = obj.PolynomialOrder;

% Compute TransformationDelayMatrix2 using compute_Td2

obj.TransformationDelayMatrix2 = compute_Td2(M);

end

end

When I tried to access this object TransformationDelayMatrix2

% Initialization

myNRC = NewtonRateConverter('InputSampleRate', 44100, 'OutputSampleRate', 48000, 'PolynomialOrder', 3);

myNRC.TransformationDelayMatrix2

In the command window it displays :

>> myNRC.TransformationDelayMatrix2

ans =

[]

Why is this an empty array shown please could you clear out this doubt ?Please could you debugg ?

Answer 1

[Naga]

The issue arises because the 'TransformationDelayMatrix2' property isn't automatically calculated when you create a 'NewtonRateConverter' instance. To fix this, explicitly call the 'computeTransformationDelayMatrix2' method.

For automatic computation during object creation, modify the class constructor to call 'computeTransformationDelayMatrix2' after setting the 'PolynomialOrder' property. Ensure 'PolynomialOrder' is initialized before the method call. Implement these changes to streamline the initialization process.

% Constructor
function obj = NewtonRateConverter(varargin)
    % Constructor for the NewtonRateConverter class
    setProperties(obj, nargin, varargin{:}, ...
        'InputSampleRate', ...
        'OutputSampleRate', ...
        'OutputRateTolerance', ...
        'PolynomialOrder');
    
    % Compute TransformationDelayMatrix2
    computeTransformationDelayMatrix2(obj);
end