zerodf

Functions

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

zerodf [ option ] bfile [ infile ]

• -m int

  • order of coefficients \((0 \le M)\)

• -p int

  • frame period \((1 \le P)\)

• -i int

  • interpolation period \((0 \le I \le P/2)\)

• -t bool

  • transpose filter

• -k bool

  • filtering without gain

• bfile str

  • double-type FIR filter coefficients

• infile str

  • double-type input sequence

• stdout

  • double-type output sequence

In the below example, an exciation signal generated from pitch information is passed through the standard form synthesis filter built from FIR filter coefficients.

excite < data.pitch | poledf data.fir > data.syn

Parameters

• argc – [in] Number of arguments.

• argv – [in] Argument vector.

Returns

0 on success, 1 on failure.

See also

poledf norm0

class sptk::AllZeroDigitalFilter

Apply all-zero digital filter for speech synthesis to signals.

The transfer function \(H(z)\) of an all-zero filter is

\[ H(z) = \displaystyle\sum_{m=0}^M b(m)z^{-m}, \]

where \(M\) is the order of filter.

Given the \(M\)-th order filter coefficients,

\[ \begin{array}{cccc} b(0), & b(1), & \ldots, & b(M), \end{array} \]

an output signal is obtained by applying \(H(z)\) to an input signal in time domain.

Public Functions

AllZeroDigitalFilter(int num_filter_order, bool transposition)

Parameters

• num_filter_order – [in] Order of filter coefficients, \(M\).

• transposition – [in] If true, use transposed form filter.

inline int GetNumFilterOrder() const

Returns

Order of coefficients.

inline bool IsTransposition() const

Returns

True if transposed form is used.

inline bool IsValid() const

Returns

True if this object is valid.

bool Run(const std::vector<double> &filter_coefficients, double filter_input, double *filter_output, AllZeroDigitalFilter::Buffer *buffer) const

Parameters

• filter_coefficients – [in] \(M\)-th order FIR filter coefficients.

• filter_input – [in] Input signal.

• filter_output – [out] Output signal.

• buffer – [inout] Buffer.

Returns

True on success, false on failure.

bool Run(const std::vector<double> &filter_coefficients, double *input_and_output, AllZeroDigitalFilter::Buffer *buffer) const

Parameters

• filter_coefficients – [in] \(M\)-th order FIR filter coefficients.

• input_and_output – [inout] Input/output signal.

• buffer – [inout] Buffer.

Returns

True on success, false on failure.

class Buffer

Buffer for AllZeroDigitalFilter class.