Line data    Source code

       1             : /******************************************************************************************************
       2             : 
       3             :    (C) 2022-2025 IVAS codec Public Collaboration with portions copyright Dolby International AB, Ericsson AB,
       4             :    Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,
       5             :    Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,
       6             :    Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other
       7             :    contributors to this repository. All Rights Reserved.
       8             : 
       9             :    This software is protected by copyright law and by international treaties.
      10             :    The IVAS codec Public Collaboration consisting of Dolby International AB, Ericsson AB,
      11             :    Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,
      12             :    Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,
      13             :    Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other
      14             :    contributors to this repository retain full ownership rights in their respective contributions in
      15             :    the software. This notice grants no license of any kind, including but not limited to patent
      16             :    license, nor is any license granted by implication, estoppel or otherwise.
      17             : 
      18             :    Contributors are required to enter into the IVAS codec Public Collaboration agreement before making
      19             :    contributions.
      20             : 
      21             :    This software is provided "AS IS", without any express or implied warranties. The software is in the
      22             :    development stage. It is intended exclusively for experts who have experience with such software and
      23             :    solely for the purpose of inspection. All implied warranties of non-infringement, merchantability
      24             :    and fitness for a particular purpose are hereby disclaimed and excluded.
      25             : 
      26             :    Any dispute, controversy or claim arising under or in relation to providing this software shall be
      27             :    submitted to and settled by the final, binding jurisdiction of the courts of Munich, Germany in
      28             :    accordance with the laws of the Federal Republic of Germany excluding its conflict of law rules and
      29             :    the United Nations Convention on Contracts on the International Sales of Goods.
      30             : 
      31             : *******************************************************************************************************/
      32             : 
      33             : /*====================================================================================
      34             :     EVS Codec 3GPP TS26.443 Nov 04, 2021. Version 12.14.0 / 13.10.0 / 14.6.0 / 15.4.0 / 16.3.0
      35             :   ====================================================================================*/
      36             : 
      37             : #include <stdint.h>
      38             : #include "options.h"
      39             : #ifdef DEBUGGING
      40             : #include "debug.h"
      41             : #endif
      42             : #include "prot.h"
      43             : #include "wmc_auto.h"
      44             : 
      45             : /*-------------------------------------------------------------------*
      46             :  * deemph()
      47             :  *
      48             :  * Deemphasis: filtering through 1/(1-mu z^-1)
      49             :  *-------------------------------------------------------------------*/
      50             : 
      51     9321230 : void deemph(
      52             :     float *signal,   /* i/o: signal            */
      53             :     const float mu,  /* i  : deemphasis factor */
      54             :     const int16_t L, /* i  : vector size       */
      55             :     float *mem       /* i/o: memory (y[-1])    */
      56             : )
      57             : {
      58             :     int16_t i;
      59             : 
      60     9321230 :     signal[0] = signal[0] + mu * ( *mem );
      61  1437116228 :     for ( i = 1; i < L; i++ )
      62             :     {
      63  1427794998 :         signal[i] = signal[i] + mu * signal[i - 1];
      64             :     }
      65             : 
      66     9321230 :     *mem = signal[L - 1];
      67             : 
      68     9321230 :     if ( ( *mem < 1e-10 ) & ( *mem > -1e-10 ) )
      69             :     {
      70      239754 :         *mem = 0;
      71             :     }
      72             : 
      73     9321230 :     return;
      74             : }