lspcheck

Functions

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

lspcheck [ option ] [ infile ]

• -m int

  • order of line spectral pairs $(0\le M)$

• -s double

  • sampling rate $(0<F_s)$

• -k int

  • input gain type

    • 0 linear gain

    • 1 log gain

    • 2 without gain

• -q int

  • input format

    • 0 frequency in rad

    • 1 frequency in cyc

    • 2 frequency in kHz

    • 3 frequency in Hz

• -o int

  • output format

    • 0 frequency in rad

    • 1 frequency in cyc

    • 2 frequency in kHz

    • 3 frequency in Hz

• -e int

  • warning type

    • 0 no warning

    • 1 output index

    • 2 output index and exit immediately

• -r double

  • rate of distance between adjacent LSPs $(0\le R\le 1)$

• -g double

  • minimum gain on linear scale $(0<G)$

• -x

  • perform modification

• infile str

  • double-type LSP coefficients

• stdout

  • double-type modified LSP coefficients

In the following example, 9-th order LSP coefficients in data.lsp are modified so that the distance between two adjacent LSPs is greater than $0.01\pi /(M+1)$.

lspcheck -m 9 -r 0.01 -x < data.lsp > data2.lsp

Parameters:

• argc – [in] Number of arguments.

• argv – [in] Argument vector.

Returns:

0 on success, 1 on failure.

See also

lspdf lpc2lsp lsp2lpc

class LineSpectralPairsStabilityCheck

Check stability of line spectral pairs and modify them.

The input is the $M$-th order LSP:

$$\begin{array}{cccc}K,& \omega (1),& \dots ,& \omega (M),\end{array}$$

and the output is the modified $M$-th order LSP:

$$\begin{array}{cccc}K,& {\omega }^{\prime }(1),& \dots ,& {\omega }^{\prime }(M).\end{array}$$

The stability of LSP can be written as

$$\begin{array}{r}\begin{array}{rcl}\omega (1)& \ge & \delta ,\\ \omega (m)-\omega (m-1)& \ge & \delta ,(1<m<M)\\ \omega (M)& \le & \pi -\delta ,\end{array}\end{array}$$

where $0\le \delta \le \pi /(M+1)$.

Public Functions

LineSpectralPairsStabilityCheck(int num_order, double minimum_distance)

Parameters:

• num_order – [in] Order of LSP, $M$.

• minimum_distance – [in] Minimum distance between lines, $\delta$.

inline int GetNumOrder() const

Returns:

Order of coefficients.

inline double GetMinimumDistance() const

Returns:

Minimum distance between lines.

inline bool IsValid() const

Returns:

True if this object is valid.

bool Run(const std::vector<double> &line_spectral_pairs, std::vector<double> *modified_line_spectral_pairs, bool *is_stable) const

Parameters:

• line_spectral_pairs – [in] $M$-th order LSP.

• modified_line_spectral_pairs – [out] Modified $M$-th order LSP (optional).

• is_stable – [out] True if the given coefficients are stable.

Returns:

True on success, false on failure.

bool Run(std::vector<double> *input_and_output, bool *is_stable) const

Parameters:

• input_and_output – [inout] $M$-th order coefficients.

• is_stable – [out] True if the given coefficients are stable.

Returns:

True on success, false on failure.