DCT

class DCT : public tsa::BaseFFT

Multichannel Discrete Cosine Transform.

Operations

void operator()(SeqViewDouble &in, SeqViewDouble &out)

Apply the transformation on the data

Return

a reference to this instance of the class

Parameters

  • in: a reference to the buffer containing the input data

  • out: a reference to the buffer containing the input data

void execute(Dmatrix &in, Dmatrix &out)

Execution of the fft of a multichannel buffer of double. Input data are organized in a matrix. Each row is a different channel, and the number of data to transform is equal to the number of columns. Both the number of rows and the number of columns can change between each call to this method. If the number of rows changes nothing special will happen, if the number of cols changes the plan is reevaluated with the current flags.

Pre

The number of rows of input and output matrix must be the same.

Pre

The columns of the output matrix must be int(n/2)+1, where n is the number of columns of the input matrix.

Post

the input buffer is unchanged, unless SetPreserveInput(false) was called

Post

the output buffer contain the fft of the input data

Exceptions

  • bad_matrix_size: the size of the output matrix is wrong

Parameters

  • in: reference to the input multichannel buffer

  • out: reference to the output multichannel buffer

void execute(Dvector &in, Dvector &out)

Execution of the fft of a single channel buffer of double. If the number of the buffer changes the plan is reevaluated with the current flags.

Pre

The sized of the output vector must be int(n/2)+1, where n is the size of the input vector.

Post

the input buffer is unchanged, unless SetPreserveInput(false) was called

Post

the output buffer contain the fft of the input data

Exceptions

  • bad_matrix_size: the size of the output matrix is wrong

Parameters

  • in: reference to the input buffer

  • out: reference to the output buffer

void MakePlan()

Make a new plan, with the current parameters.

Exceptions

  • std::runtime_error: The new plan cannot be created

Public Functions

DCT(int size = 0, enum FFTPlanningMode mode = ESTIMATE, bool PreserveInput = true)

Constructor

Parameters

  • size: the size of the transform

  • mode: specify the way in which plans are calculated

  • PreserveInput: true if the input buffer must be preserved during the transform, false otherwise

DCT(const DCT &from)

Copy constructor

Parameters

  • from: The instance that must be copied

~DCT()

Destructor