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<p>Common code shared between SC and PTM (tied-state) models.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <sphinxbase/logmath.h></code><br />
<code>#include <sphinxbase/fixpoint.h></code><br />
</div>
<p><a href="tied__mgau__common_8h_source.html">Go to the source code of this file.</a></p>
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Macros</h2></td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>MGAU_MIXW_VERSION</b>   "1.0" /* Sphinx-3 file format version for mixw */</td></tr>
<tr class="separator:a6b148848668aa5ddeb21f9e5726f8205"><td class="memSeparator" colspan="2"> </td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>MGAU_PARAM_VERSION</b>   "1.0" /* Sphinx-3 file format version for mean/var */</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>NONE</b>   -1</td></tr>
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<tr class="memitem:a9512d04e0db6aa7d0c857071935df145"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a9512d04e0db6aa7d0c857071935df145"></a>
#define </td><td class="memItemRight" valign="bottom"><b>WORST_DIST</b>   (int32)(0x80000000)</td></tr>
<tr class="separator:a9512d04e0db6aa7d0c857071935df145"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a740dfe5b30e702ba8b2ec7426bd4d57e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a740dfe5b30e702ba8b2ec7426bd4d57e"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="tied__mgau__common_8h.html#a740dfe5b30e702ba8b2ec7426bd4d57e">GMMSUB</a>(a, b)   ((a)-(b))</td></tr>
<tr class="memdesc:a740dfe5b30e702ba8b2ec7426bd4d57e"><td class="mdescLeft"> </td><td class="mdescRight">Subtract GMM component b (assumed to be positive) and saturate. <br /></td></tr>
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<tr class="memitem:a1f6b744cf1ced48452fcb90b5b0ccde2"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1f6b744cf1ced48452fcb90b5b0ccde2"></a>
#define </td><td class="memItemRight" valign="bottom"><b>GMMADD</b>(a, b)   ((a)+(b))</td></tr>
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<tr class="memitem:a3acffbd305ee72dcd4593c0d8af64a4f"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3acffbd305ee72dcd4593c0d8af64a4f"></a>
#define </td><td class="memItemRight" valign="bottom"><b>MIN</b>(a, b)   ((a) < (b) ? (a) : (b))</td></tr>
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#define </td><td class="memItemRight" valign="bottom"><b>LOGMATH_INLINE</b>   static</td></tr>
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<tr class="memitem:ad739d757ed78293c18dc2386fd3b750e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="tied__mgau__common_8h.html#ad739d757ed78293c18dc2386fd3b750e">MAX_NEG_MIXW</a>   159</td></tr>
<tr class="memdesc:ad739d757ed78293c18dc2386fd3b750e"><td class="mdescLeft"> </td><td class="mdescRight">Maximum negated mixture weight value. <a href="#ad739d757ed78293c18dc2386fd3b750e">More...</a><br /></td></tr>
<tr class="separator:ad739d757ed78293c18dc2386fd3b750e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a965d50d73044c3f2dc2589662fd2e89e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="tied__mgau__common_8h.html#a965d50d73044c3f2dc2589662fd2e89e">MAX_NEG_ASCR</a>   96</td></tr>
<tr class="memdesc:a965d50d73044c3f2dc2589662fd2e89e"><td class="mdescLeft"> </td><td class="mdescRight">Maximum negated acoustic score value. <a href="#a965d50d73044c3f2dc2589662fd2e89e">More...</a><br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a947ea19b4351ecbf70330e089994c3a1"><td class="memItemLeft" align="right" valign="top">LOGMATH_INLINE int </td><td class="memItemRight" valign="bottom"><a class="el" href="tied__mgau__common_8h.html#a947ea19b4351ecbf70330e089994c3a1">fast_logmath_add</a> (logmath_t *lmath, int mlx, int mly)</td></tr>
<tr class="memdesc:a947ea19b4351ecbf70330e089994c3a1"><td class="mdescLeft"> </td><td class="mdescRight">Quickly log-add two negated log probabilities. <a href="#a947ea19b4351ecbf70330e089994c3a1">More...</a><br /></td></tr>
<tr class="separator:a947ea19b4351ecbf70330e089994c3a1"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Common code shared between SC and PTM (tied-state) models. </p>
<p>Definition in file <a class="el" href="tied__mgau__common_8h_source.html">tied_mgau_common.h</a>.</p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
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<td class="memname">#define MAX_NEG_ASCR   96</td>
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<p>Maximum negated acoustic score value. </p>
<p>Definition at line <a class="el" href="tied__mgau__common_8h_source.html#l00083">83</a> of file <a class="el" href="tied__mgau__common_8h_source.html">tied_mgau_common.h</a>.</p>
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<td class="memname">#define MAX_NEG_MIXW   159</td>
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<p>Maximum negated mixture weight value. </p>
<p>Definition at line <a class="el" href="tied__mgau__common_8h_source.html#l00082">82</a> of file <a class="el" href="tied__mgau__common_8h_source.html">tied_mgau_common.h</a>.</p>
<p>Referenced by <a class="el" href="ptm__mgau_8c_source.html#l00409">ptm_mgau_frame_eval()</a>.</p>
</div>
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">LOGMATH_INLINE int fast_logmath_add </td>
<td>(</td>
<td class="paramtype">logmath_t * </td>
<td class="paramname"><em>lmath</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>mlx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>mly</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Quickly log-add two negated log probabilities. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">lmath</td><td>The log-math object </td></tr>
<tr><td class="paramname">mlx</td><td>A negative log probability (0 < mlx < 255) </td></tr>
<tr><td class="paramname">mly</td><td>A negative log probability (0 < mly < 255) </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>-log(exp(-mlx)+exp(-mly))</dd></dl>
<p>We can do some extra-fast log addition since we know that mixw+ascr is always less than 256 and hence x-y is also always less than 256. This relies on some cooperation from logmath_t which will never produce a logmath table smaller than 256 entries.</p>
<p>Note that the parameters are <em>negated</em> log probabilities (and hence, are positive numbers), as is the return value. This is the key to the "fastness" of this function. </p>
<p>Definition at line <a class="el" href="tied__mgau__common_8h_source.html#l00103">103</a> of file <a class="el" href="tied__mgau__common_8h_source.html">tied_mgau_common.h</a>.</p>
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