libspeex/lsp.h

/*---------------------------------------------------------------------------*\
Original Copyright
	FILE........: AK2LSPD.H
	TYPE........: Turbo C header file
	COMPANY.....: Voicetronix
	AUTHOR......: James Whitehall
	DATE CREATED: 21/11/95

Modified by Jean-Marc Valin

    This file contains functions for converting Linear Prediction
    Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the
    LSP coefficients are not in radians format but in the x domain of the
    unit circle.

\*---------------------------------------------------------------------------*/
/**
   @file lsp.h
   @brief Line Spectral Pair (LSP) functions.
*/
/* Speex License:

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*/

#ifndef __AK2LSPD__
#define __AK2LSPD__

#include "arch.h"

int lpc_to_lsp (spx_coef_t *a, int lpcrdr, spx_lsp_t *freq, int nb, spx_word16_t delta, char *stack);
void lsp_to_lpc(const spx_lsp_t *freq, spx_coef_t *ak, int lpcrdr, char *stack);

/*Added by JMV*/
void lsp_interpolate(spx_lsp_t *old_lsp, spx_lsp_t *new_lsp, spx_lsp_t *interp_lsp, int len, int subframe, int nb_subframes, spx_word16_t margin);

#endif	/* __AK2LSPD__ */