dfs

Functions

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

dfs [ option ] [ infile ]

  • -a int+

    • denominator coefficients

  • -b int+

    • numerator coefficients

  • -p str

    • file containing denominator coefficients

  • -z str

    • file containing numerator coefficients

  • infile str

    • double-type filter input

  • stdout

    • double-type filter output

The below example applies a pre-emphasis filter to signals in data.d 

dfs -a 1 -0.97 < data.d > data.d2

This is equivalent to the following procedure.

echo 1 -0.97 | x2x +ad > data.p
dfs -p data.p < data.d > data.d2

Parameters

  • argc – [in] Number of arguments.

  • argv – [in] Argument vector.

Returns

0 on success, 1 on failure.

See also

df2

class sptk::InfiniteImpulseResponseDigitalFilter

Apply infinite impulse response digital filter in time domain.

Input signal is filtered by

\[ H(z) = K \frac{\displaystyle\sum_{m=0}^M b(m) z^{-m}} {1 + \displaystyle\sum_{n=1}^N a(n) z^{-n}}, \]
where \(K\) is the gain.

Public Functions

InfiniteImpulseResponseDigitalFilter(const std::vector<double> &denominator_coefficients, const std::vector<double> &numerator_coefficients)
Parameters

  • denominator_coefficients – [in] Denominator coefficients, \(K\) and \(\{ a(n) \}_{n=1}^N\).

  • numerator_coefficients – [in] Numerator coefficients, \(\{ b(m) \}_{m=0}^M\).

inline int GetNumDenominatorOrder() const
Returns

Order of denominator coefficients.

inline int GetNumNumeratorOrder() const
Returns

Order of numerator coefficients.

inline bool IsValid() const
Returns

True if this object is valid.

bool Run(double input, double *output, InfiniteImpulseResponseDigitalFilter::Buffer *buffer) const
Parameters

  • input – [in] Filter input.

  • output – [out] Filter output.

  • buffer – [inout] Buffer.

Returns

True on success, false on failure.

bool Run(double *input_and_output, InfiniteImpulseResponseDigitalFilter::Buffer *buffer) const
Parameters

  • input_and_output – [inout] Input/output signal.

  • buffer – [inout] Buffer.

Returns

True on success, false on failure.

class Buffer

Buffer for InfiniteImpulseResponseDigitalFilter class.