log_add.c

WinCE平台上的语音识别程序

/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 1999-2001 Carnegie Mellon University.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
 * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
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 */

/*
 * log_add.h -- Lookup table for addition for 8-bit logprob values.
 *
 * **********************************************
 * CMU ARPA Speech Project
 *
 * Copyright (c) 1996 Carnegie Mellon University.
 * ALL RIGHTS RESERVED.
 * **********************************************
 * 
 * HISTORY
 * 
 * 
 * 16-May-95	M K Ravishankar ([e-mail]) at Carnegie Mellon University
 * 		Created.
 */


#ifndef __S2_LOGADD_H__
#define __S2_LOGADD_H__		1


/* Table for adding probs in log domain.  (See add_table.h for log base
 * and definition of LOG.):
 * (NOTE: Works only within the limited dynamic range of SCVQ, which keeps
 * the indexes into logadd_tbl within 255.)
 * 
 * LOG(p1+p2) = -(logadd_tbl[(-LOG(p1))>>10][(-LOG(p2))>>10] << 10).
 * 
 * (Although logically defined as a 2-d array, logadd_tbl is flattened out
 * below.)
 */
const unsigned char logadd_tbl[] = {
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    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
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    5,
    5,
    0,
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    0,
    0,
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    1,
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    1,
    2,
    2,
    2,
    3,
    3,
    3,
    3,
    4,
    4,
    4,
    4,
    4,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
    5,
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    6,
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    6,
    6,
    6,