38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
/******************************************************************
|
|
|
|
iLBC Speech Coder ANSI-C Source Code
|
|
|
|
WebRtcIlbcfix_Chebyshev.h
|
|
|
|
******************************************************************/
|
|
|
|
#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_CHEBYSHEV_H_
|
|
#define WEBRTC_MODULES_AUDIO_CODING_CODECS_ILBC_MAIN_SOURCE_CHEBYSHEV_H_
|
|
|
|
#include "defines.h"
|
|
|
|
/*------------------------------------------------------------------*
|
|
* Calculate the Chevyshev polynomial series
|
|
* F(w) = 2*exp(-j5w)*C(x)
|
|
* C(x) = (T_0(x) + f(1)T_1(x) + ... + f(4)T_1(x) + f(5)/2)
|
|
* T_i(x) is the i:th order Chebyshev polynomial
|
|
*------------------------------------------------------------------*/
|
|
|
|
WebRtc_Word16 WebRtcIlbcfix_Chebyshev(
|
|
/* (o) Result of C(x) */
|
|
WebRtc_Word16 x, /* (i) Value to the Chevyshev polynomial */
|
|
WebRtc_Word16 *f /* (i) The coefficients in the polynomial */
|
|
);
|
|
|
|
#endif
|