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:

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

and the output is the modified \(M\)-th order LSP:

\[ \begin{array}{cccc} K, & \omega'(1), & \ldots, & \omega'(M). \end{array} \]

The stability of LSP can be written as

\[\begin{split}\begin{eqnarray} \omega(1) &\ge& \delta, \\ \omega(m) - \omega(m - 1) &\ge& \delta, \quad (1 < m < M) \\ \omega(M) &\le& \pi - \delta, \\ \end{eqnarray}\end{split}\]

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.