att_bwx.c
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上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:2k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- This software module was originally developed by
- Peter Kroon (Bell Laboratories, Lucent Technologies)
- in the course of development of the MPEG-2 NBC/MPEG-4 Audio standard
- ISO/IEC 13818-7, 14496-1,2 and 3. This software module is an
- implementation of a part of one or more MPEG-2 NBC/MPEG-4 Audio tools
- as specified by the MPEG-2 NBC/MPEG-4 Audio standard. ISO/IEC gives
- users of the MPEG-2 NBC/MPEG-4 Audio standards free license to this
- software module or modifications thereof for use in hardware or
- software products claiming conformance to the MPEG-2 NBC/ MPEG-4 Audio
- standards. Those intending to use this software module in hardware or
- software products are advised that this use may infringe existing
- patents. The original developer of this software module and his/her
- company, the subsequent editors and their companies, and ISO/IEC have
- no liability for use of this software module or modifications thereof
- in an implementation. Copyright is not released for non MPEG-2
- NBC/MPEG-4 Audio conforming products. The original developer retains
- full right to use the code for his/her own purpose, assign or donate
- the code to a third party and to inhibit third party from using the
- code for non MPEG-2 NBC/MPEG-4 Audio conforming products. This
- copyright notice must be included in all copies or derivative works.
- Copyright (c) 1996.
- * Last modified: May 1, 1996
- *
- * Modified June 27, 1996
- * changed a[1]->a[order] to a[0]->a[order-1]
- */
- /*----------------------------------------------------------------------------
- * bwx - weight lpc filter coefficients with gamma**n
- *----------------------------------------------------------------------------
- */
- #include "att_proto.h"
- void bwx(
- float *bw, /* ouput : bw expanded coefficients */
- const float *a, /* input : lpc coefficients */
- const float w, /* input : gamma factor */
- const long order /* input : LPC order */
- )
- {
- long i;
- float s;
- /* 06/27/96
- s = 1.0;
- for(i=0;i<=order;i++)
- */
- s = w;
- for(i=0;i<order;i++)
- {
- bw[i] = a[i] * s;
- s = s * w;
- }
- }