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