ap

Functions

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

ap [ option ] f0file [ infile ]

  • -a int

    • algorithm used for aperiodicity extraction

      • 0 TANDEM-STRAIGHT

      • 1 WORLD (D4C)

  • -l int

    • FFT length

  • -p int

    • frame shift [point] \((1 \le P)\)

  • -s double

    • sampling rate [kHz] \((8 \le F_s \le 98)\)

  • -L double

    • lower bound of aperiodicity \((0 \le L < H)\)

  • -H double

    • upper bound of aperiodicity \((L < H \le 1)\)

  • -q int

    • f0 input format

      • 0 pitch \((F_s / F_0)\)

      • 1 F0

      • 2 log F0

  • -o int

    • output format

      • 0 Ha

      • 1 Hp

      • 2 Ha/Hp

      • 3 Hp/Ha

  • infile str

    • double-type waveform

  • f0file str

    • double-type pitch

  • stdout

    • double-type aperiodicity

The below is a simple example to extract aperiodicity from data.d.

pitch -s 16 -p 80 -L 80 -H 200 -o 1 < data.d > data.f0
ap -s 16 -p 80 -q 1 data.f0 < data.d > data.ap
Parameters:

  • argc – [in] Number of arguments.

  • argv – [in] Argument vector.

Returns:

0 on success, 1 on failure.

See also

pitch

class AperiodicityExtraction

Extract aperiodicity from waveform.

The input is whole audio waveform and the output is the sequence of the aperiodicity measure. The implemented algorithms of the extraction are TANDEM-STRAIGHT and D4C.

[1] H. Kawahara et al., “Simplification and extension of non-periodic excitation source representations for high-quality speech manipulation systems,” Proc. of Interspeech, pp. 38-41, 2010.

[2] M. Morise, “D4C, a band-aperiodicity estimator for high-quality speech synthesis,” Proc. of Speech Communication, vol. 84, pp. 57-65, 2016.

Public Types

enum Algorithms

Aperiodicity extraction algorithms.

Values:

enumerator kTandem
enumerator kWorld
enumerator kNumAlgorithms

Public Functions

AperiodicityExtraction(int fft_length, int frame_shift, double sampling_rate, Algorithms algorithm)
Parameters:

  • fft_length – [in] FFT length.

  • frame_shift – [in] Frame shift in point.

  • sampling_rate – [in] Sampling rate in Hz.

  • algorithm – [in] Algorithm used for aperiodicity extraction.

inline bool IsValid() const
Returns:

True if this object is valid.

bool Run(const std::vector<double> &waveform, const std::vector<double> &f0, std::vector<std::vector<double>> *aperiodicity) const
Parameters:

  • waveform – [in] Waveform.

  • f0 – [in] Fundamental frequency in Hz.

  • aperiodicity – [out] Aperiodicity measure.

Returns:

True on success, false on failure.