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<h1>src/libpocketsphinx/tied_mgau_common.h File Reference</h1> </div>
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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>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="define-members"></a>
Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6b148848668aa5ddeb21f9e5726f8205"></a><!-- doxytag: member="tied_mgau_common.h::MGAU_MIXW_VERSION" ref="a6b148848668aa5ddeb21f9e5726f8205" args="" -->
#define </td><td class="memItemRight" valign="bottom"><b>MGAU_MIXW_VERSION</b>   "1.0"</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a14319cfdc013dfddf30896654b6e6500"></a><!-- doxytag: member="tied_mgau_common.h::MGAU_PARAM_VERSION" ref="a14319cfdc013dfddf30896654b6e6500" args="" -->
#define </td><td class="memItemRight" valign="bottom"><b>MGAU_PARAM_VERSION</b>   "1.0"</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a655c84af1b0034986ff56e12e84f983d"></a><!-- doxytag: member="tied_mgau_common.h::NONE" ref="a655c84af1b0034986ff56e12e84f983d" args="" -->
#define </td><td class="memItemRight" valign="bottom"><b>NONE</b>   -1</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a9512d04e0db6aa7d0c857071935df145"></a><!-- doxytag: member="tied_mgau_common.h::WORST_DIST" ref="a9512d04e0db6aa7d0c857071935df145" args="" -->
#define </td><td class="memItemRight" valign="bottom"><b>WORST_DIST</b>   (int32)(0x80000000)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a740dfe5b30e702ba8b2ec7426bd4d57e"></a><!-- doxytag: member="tied_mgau_common.h::GMMSUB" ref="a740dfe5b30e702ba8b2ec7426bd4d57e" args="(a, b)" -->
#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><td class="mdescLeft"> </td><td class="mdescRight">Subtract GMM component b (assumed to be positive) and saturate. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1f6b744cf1ced48452fcb90b5b0ccde2"></a><!-- doxytag: member="tied_mgau_common.h::GMMADD" ref="a1f6b744cf1ced48452fcb90b5b0ccde2" args="(a, b)" -->
#define </td><td class="memItemRight" valign="bottom"><b>GMMADD</b>(a, b)   ((a)+(b))</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3acffbd305ee72dcd4593c0d8af64a4f"></a><!-- doxytag: member="tied_mgau_common.h::MIN" ref="a3acffbd305ee72dcd4593c0d8af64a4f" args="(a, b)" -->
#define </td><td class="memItemRight" valign="bottom"><b>MIN</b>(a, b)   ((a) < (b) ? (a) : (b))</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8be78151b3b0ce922541c2755b14ebf1"></a><!-- doxytag: member="tied_mgau_common.h::LOGMATH_INLINE" ref="a8be78151b3b0ce922541c2755b14ebf1" args="" -->
#define </td><td class="memItemRight" valign="bottom"><b>LOGMATH_INLINE</b>   static</td></tr>
<tr><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><td class="mdescLeft"> </td><td class="mdescRight">Maximum negated mixture weight value. <a href="#ad739d757ed78293c18dc2386fd3b750e"></a><br/></td></tr>
<tr><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><td class="mdescLeft"> </td><td class="mdescRight">Maximum negated acoustic score value. <a href="#a965d50d73044c3f2dc2589662fd2e89e"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><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><td class="mdescLeft"> </td><td class="mdescRight">Quickly log-add two negated log probabilities. <a href="#a947ea19b4351ecbf70330e089994c3a1"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>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><hr/><h2>Define Documentation</h2>
<a class="anchor" id="a965d50d73044c3f2dc2589662fd2e89e"></a><!-- doxytag: member="tied_mgau_common.h::MAX_NEG_ASCR" ref="a965d50d73044c3f2dc2589662fd2e89e" args="" -->
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<td class="memname">#define MAX_NEG_ASCR   96</td>
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<div class="memdoc">
<p>Maximum negated acoustic score value. </p>
<p>Definition at line <a class="el" href="tied__mgau__common_8h_source.html#l00085">85</a> of file <a class="el" href="tied__mgau__common_8h_source.html">tied_mgau_common.h</a>.</p>
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</div>
<a class="anchor" id="ad739d757ed78293c18dc2386fd3b750e"></a><!-- doxytag: member="tied_mgau_common.h::MAX_NEG_MIXW" ref="ad739d757ed78293c18dc2386fd3b750e" args="" -->
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<td class="memname">#define MAX_NEG_MIXW   159</td>
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<div class="memdoc">
<p>Maximum negated mixture weight value. </p>
<p>Definition at line <a class="el" href="tied__mgau__common_8h_source.html#l00084">84</a> of file <a class="el" href="tied__mgau__common_8h_source.html">tied_mgau_common.h</a>.</p>
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<hr/><h2>Function Documentation</h2>
<a class="anchor" id="a947ea19b4351ecbf70330e089994c3a1"></a><!-- doxytag: member="tied_mgau_common.h::fast_logmath_add" ref="a947ea19b4351ecbf70330e089994c3a1" args="(logmath_t *lmath, int mlx, int mly)" -->
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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>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Quickly log-add two negated log probabilities. </p>
<dl><dt><b>Parameters:</b></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="return"><dt><b>Returns:</b></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 *negated* 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#l00105">105</a> of file <a class="el" href="tied__mgau__common_8h_source.html">tied_mgau_common.h</a>.</p>
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