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/*
* Copyright (C) 2004-2010 NXP Software
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/************************************************************************/
/* */
/* Project:: */
/* $Author: nxp27078 $*/
/* $Revision: 762 $*/
/* $Date: 2010-06-11 14:50:33 +0200 (vr, 11 jun 2010) $*/
/* */
/************************************************************************/
#include "LVM_Types.h"
#include "Filter.h"
#include "LVM_Macros.h"
/************************************************************************************/
/* */
/* Defines and Tables for 2*Pi/Fs */
/* */
/************************************************************************************/
#define LVVDL_2PiBy_8000 1727108826 /* In Q41 format */
#define LVVDL_2PiBy_11025 1253230894 /* In Q41 format */
#define LVVDL_2PiBy_12000 1151405884 /* In Q41 format */
#define LVVDL_2PiByFs_SHIFT1 12 /* Qformat shift for 8kHz, 11.025kHz and 12kHz i.e. 12=41-29 */
#define LVVDL_2PiByFs_SHIFT2 13 /* Qformat shift for 16kHz, 22.050kHz and 24kHz i.e. 13=42-29 */
#define LVVDL_2PiByFs_SHIFT3 14 /* Qformat shift for 32kHz, 44.1kHz and 48kHz i.e. 14=43-29 */
const LVM_INT32 LVVDL_2PiOnFsTable[] = {LVVDL_2PiBy_8000 , /* 8kHz in Q41, 16kHz in Q42, 32kHz in Q43 */
LVVDL_2PiBy_11025, /* 11025 Hz in Q41, 22050Hz in Q42, 44100 Hz in Q43*/
LVVDL_2PiBy_12000}; /* 12kHz in Q41, 24kHz in Q42, 48kHz in Q43 */
const LVM_INT32 LVVDL_2PiOnFsShiftTable[]={LVVDL_2PiByFs_SHIFT1 , /* 8kHz, 11025Hz, 12kHz */
LVVDL_2PiByFs_SHIFT2, /* 16kHz, 22050Hz, 24kHz*/
LVVDL_2PiByFs_SHIFT3}; /* 32kHz, 44100Hz, 48kHz */
/*-------------------------------------------------------------------------*/
/* FUNCTION: */
/* LVM_GetOmega */
/* */
/* LVM_INT32 LVM_GetOmega(LVM_UINT16 Fc, */
/* LVM_Fs_en Fs) */
/* */
/* DESCRIPTION: */
/* This function calculates the value of w using Fc and Fs */
/* */
/* PARAMETERS: */
/* */
/* LVM_UINT16 Fc The corner frequency in Hz Q16.0 format */
/* LVM_Fs_en Fs The SampleRate */
/* RETURNS: */
/* w=2*pi*Fc/Fs in Q2.29 format */
/*-------------------------------------------------------------------------*/
LVM_INT32 LVM_GetOmega(LVM_UINT16 Fc,
LVM_Fs_en Fs)
{
LVM_INT32 w;
MUL32x32INTO32((LVM_INT32)Fc,LVVDL_2PiOnFsTable[Fs%3],w,LVVDL_2PiOnFsShiftTable[Fs/3])
return w;
}
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