ifft2

Functions

int main(int argc, char *argv[])

ifft2 [ option ] [ infile ]

  • -l int

    • FFT length \((1 \le L)\)

  • -q int

    • input format

      • 0 real and imaginary parts

      • 1 real part

      • 2 imaginary part

  • -o int

    • output format

      • 0 real and imaginary parts

      • 1 real part

      • 2 imaginary part

  • -p int

    • output style

      • 0 standard

      • 1 transposed

      • 2 transposed with boundary

      • 3 quadrand with boundary

  • infile str

    • double-type 2D data sequence

  • stdout

    • double-type 2D inverse FFT sequence

Parameters

  • argc – [in] Number of arguments.

  • argv – [in] Argument vector.

Returns

0 on success, 1 on failure.

See also

ifft fft2 fftr2

class sptk::TwoDimensionalInverseFastFourierTransform

Calculate 2D inverse DFT of complex-valued input data.

The inputs are two \(M \times N\) matrices that represent real and imaginary parts:

\[ \begin{array}{cc} \mathrm{Re}(\boldsymbol{X}), & \mathrm{Im}(\boldsymbol{X}). \end{array} \]
The outputs are two \(L \times L \) matrices:
\[ \begin{array}{cccc} \mathrm{Re}(\boldsymbol{x}), & \mathrm{Im}(\boldsymbol{x}), \end{array} \]
where \(L\) is the FFT length and must be a power of two.

Public Functions

TwoDimensionalInverseFastFourierTransform(int num_row, int num_column, int fft_length)
Parameters

  • num_row – [in] Number of rows, \(M\).

  • num_column – [in] Number of columns \(N\).

  • fft_length – [in] FFT length, \(L\).

inline int GetNumRow() const
Returns

Number of rows of input.

inline int GetNumColumn() const
Returns

Number of columns of input.

inline int GetFftLength() const
Returns

FFT length.

inline bool IsValid() const
Returns

True if this object is valid.

bool Run(const Matrix &real_part_input, const Matrix &imag_part_input, Matrix *real_part_output, Matrix *imag_part_output, TwoDimensionalInverseFastFourierTransform::Buffer *buffer) const
Parameters

  • real_part_input – [in] Real part of input.

  • imag_part_input – [in] Imaginary part of input.

  • real_part_output – [out] Real part of output.

  • imag_part_output – [out] Imaginary part of output.

  • buffer – [out] Buffer.

Returns

True on success, false on failure.

bool Run(Matrix *real_part, Matrix *imag_part, TwoDimensionalInverseFastFourierTransform::Buffer *buffer) const
Parameters

  • real_part – [inout] Real part.

  • imag_part – [inout] Imaginary part.

  • buffer – [out] Buffer.

Returns

True on success, false on failure.

class Buffer

Buffer for TwoDimensionalInverseFastFourierTransform class.