mat_lib.c

MSP430单片机C语言应用程序设计实例精讲,单片机开发的朋友可以作为参考

/*

2.4 kbps MELP Proposed Federal Standard speech coder

Fixed-point C code, version 1.0

Copyright (c) 1998, Texas Instruments, Inc.  

Texas Instruments has intellectual property rights on the MELP
algorithm.  The Texas Instruments contact for licensing issues for
commercial and non-government use is William Gordon, Director,
Government Contracts, Texas Instruments Incorporated, Semiconductor
Group (phone [phone]).

The fixed-point version of the voice codec Mixed Excitation Linear
Prediction (MELP) is based on specifications on the C-language software
simulation contained in GSM 06.06 which is protected by copyright and
is the property of the European Telecommunications Standards Institute
(ETSI). This standard is available from the ETSI publication office
tel. [phone]. ETSI has granted a license to United States
Department of Defense to use the C-language software simulation contained
in GSM 06.06 for the purposes of the development of a fixed-point
version of the voice codec Mixed Excitation Linear Prediction (MELP).
Requests for authorization to make other use of the GSM 06.06 or
otherwise distribute or modify them need to be addressed to the ETSI
Secretariat fax: [phone].

*/
/*

  mat_lib.c: Matrix and vector manipulation library

*/

#include "spbstd.h"
#include "mathhalf.h"
#include "mat.h"



/***************************************************************************
 *
 *   FUNCTION NAME: v_zap
 *
 *   PURPOSE:
 *
 *     Set the elements of a 16 bit input vector to zero.
 *
 *   INPUTS:
 *
 *     vec1            16 bit short signed integer (Shortword) vector whose 
 *                     values fall in the range 
 *                     0xffff 8000 <= vec1 <= 0x0000 7fff.
 *
 *     n               size of vec1.
 *
 *   OUTPUTS:
 *
 *     none
 *
 *   RETURN VALUE:
 *
 *     vec1            16 bit short signed integer (Shortword) vector whose 
 *                     values are equal to 0x0000 0000.
 *
 *   IMPLEMENTATION:
 *
 *     Set the elements of 16 bit input vector to zero.
 *
 *     vec1 = 0
 *
 *   KEYWORDS: zap, clear, reset
 *
 *************************************************************************/

Shortword *v_zap(Shortword *vec1,Shortword n)
{
    Shortword i;

    for(i = 0; i < n; i++) {
        vec1[i] = 0;   
    }

    return(vec1);
}